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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<!-- Generated by HsColour, http://code.haskell.org/~malcolm/hscolour/ -->
<title>Control/Monad/Trans/Resource.hs</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE FlexibleContexts #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE FlexibleInstances #-}</span>
<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE MultiParamTypeClasses #-}</span>
<a name="line-4"></a><span class='hs-comment'>{-# LANGUAGE UndecidableInstances #-}</span>
<a name="line-5"></a><span class='hs-comment'>{-# LANGUAGE TypeFamilies #-}</span>
<a name="line-6"></a><span class='hs-comment'>{-# LANGUAGE RankNTypes #-}</span>
<a name="line-7"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-8"></a><span class='hs-comment'>{-# LANGUAGE DeriveDataTypeable #-}</span>
<a name="line-9"></a><span class='hs-comment'>{-# LANGUAGE ImpredicativeTypes #-}</span>
<a name="line-10"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ &gt;= 704</span>
<a name="line-11"></a><span class='hs-comment'>{-# LANGUAGE ConstraintKinds #-}</span>
<a name="line-12"></a><span class='hs-cpp'>#endif</span>
<a name="line-13"></a><span class='hs-comment'>-- | Allocate resources which are guaranteed to be released.</span>
<a name="line-14"></a><span class='hs-comment'>--</span>
<a name="line-15"></a><span class='hs-comment'>-- For more information, see &lt;<a href="http://www.yesodweb.com/book/conduits">http://www.yesodweb.com/book/conduits</a>&gt;.</span>
<a name="line-16"></a><span class='hs-comment'>--</span>
<a name="line-17"></a><span class='hs-comment'>-- One point to note: all register cleanup actions live in the @IO@ monad, not</span>
<a name="line-18"></a><span class='hs-comment'>-- the main monad. This allows both more efficient code, and for monads to be</span>
<a name="line-19"></a><span class='hs-comment'>-- transformed.</span>
<a name="line-20"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Resource</span>
<a name="line-21"></a>    <span class='hs-layout'>(</span> <span class='hs-comment'>-- * Data types</span>
<a name="line-22"></a>      <span class='hs-conid'>ResourceT</span>
<a name="line-23"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>ResIO</span>
<a name="line-24"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>ReleaseKey</span>
<a name="line-25"></a>      <span class='hs-comment'>-- * Unwrap</span>
<a name="line-26"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>runResourceT</span>
<a name="line-27"></a>      <span class='hs-comment'>-- * Special actions</span>
<a name="line-28"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>resourceForkIO</span>
<a name="line-29"></a>      <span class='hs-comment'>-- * Monad transformation</span>
<a name="line-30"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>transResourceT</span>
<a name="line-31"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>joinResourceT</span>
<a name="line-32"></a>      <span class='hs-comment'>-- * A specific Exception transformer</span>
<a name="line-33"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-34"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>runExceptionT_</span>
<a name="line-35"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>runException</span>
<a name="line-36"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>runException_</span>
<a name="line-37"></a>      <span class='hs-comment'>-- * Registering/releasing</span>
<a name="line-38"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>allocate</span>
<a name="line-39"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>register</span>
<a name="line-40"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>release</span>
<a name="line-41"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>unprotect</span> 
<a name="line-42"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>resourceMask</span>
<a name="line-43"></a>      <span class='hs-comment'>-- * Type class/associated types</span>
<a name="line-44"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>MonadResource</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-45"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>MonadUnsafeIO</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-46"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-47"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>MonadActive</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-48"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>MonadResourceBase</span>
<a name="line-49"></a>      <span class='hs-comment'>-- ** Low-level</span>
<a name="line-50"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>InvalidAccess</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-51"></a>      <span class='hs-comment'>-- * Re-exports</span>
<a name="line-52"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>MonadBaseControl</span>
<a name="line-53"></a>      <span class='hs-comment'>-- * Internal state</span>
<a name="line-54"></a>      <span class='hs-comment'>-- $internalState</span>
<a name="line-55"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>InternalState</span>
<a name="line-56"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>getInternalState</span>
<a name="line-57"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>runInternalState</span>
<a name="line-58"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>withInternalState</span>
<a name="line-59"></a>    <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-60"></a>
<a name="line-61"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Typeable</span>
<a name="line-62"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>IntMap</span> <span class='hs-layout'>(</span><span class='hs-conid'>IntMap</span><span class='hs-layout'>)</span>
<a name="line-63"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>IntMap</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>IntMap</span>
<a name="line-64"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-layout'>(</span><span class='hs-conid'>SomeException</span><span class='hs-layout'>,</span> <span class='hs-varid'>throw</span><span class='hs-layout'>,</span> <span class='hs-conid'>Exception</span><span class='hs-layout'>)</span>
<a name="line-65"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Control</span>
<a name="line-66"></a>    <span class='hs-layout'>(</span> <span class='hs-conid'>MonadTransControl</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadBaseControl</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-67"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>ComposeSt</span><span class='hs-layout'>,</span> <span class='hs-varid'>defaultLiftBaseWith</span><span class='hs-layout'>,</span> <span class='hs-varid'>defaultRestoreM</span>
<a name="line-68"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>liftBaseDiscard</span><span class='hs-layout'>,</span> <span class='hs-varid'>control</span>
<a name="line-69"></a>    <span class='hs-layout'>)</span>
<a name="line-70"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>I</span>
<a name="line-71"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Base</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadBase</span><span class='hs-layout'>,</span> <span class='hs-varid'>liftBase</span><span class='hs-layout'>)</span>
<a name="line-72"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span> <span class='hs-layout'>(</span><span class='hs-conid'>Applicative</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-73"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadTrans</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-74"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadIO</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-75"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-varid'>liftM</span><span class='hs-layout'>)</span>
<a name="line-76"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>E</span>
<a name="line-77"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span><span class='hs-layout'>)</span>
<a name="line-78"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span><span class='hs-varop'>.</span><span class='hs-conid'>Lifted</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>L</span>
<a name="line-79"></a>
<a name="line-80"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Identity</span> <span class='hs-layout'>(</span> <span class='hs-conid'>IdentityT</span><span class='hs-layout'>)</span>
<a name="line-81"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span>     <span class='hs-layout'>(</span> <span class='hs-conid'>ListT</span>    <span class='hs-layout'>)</span>
<a name="line-82"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span>    <span class='hs-layout'>(</span> <span class='hs-conid'>MaybeT</span>   <span class='hs-layout'>)</span>
<a name="line-83"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span>    <span class='hs-layout'>(</span> <span class='hs-conid'>ErrorT</span><span class='hs-layout'>,</span> <span class='hs-conid'>Error</span><span class='hs-layout'>)</span>
<a name="line-84"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Reader</span>   <span class='hs-layout'>(</span> <span class='hs-conid'>ReaderT</span>  <span class='hs-layout'>)</span>
<a name="line-85"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Cont</span>     <span class='hs-layout'>(</span> <span class='hs-conid'>ContT</span>  <span class='hs-layout'>)</span>
<a name="line-86"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span>    <span class='hs-layout'>(</span> <span class='hs-conid'>StateT</span>   <span class='hs-layout'>)</span>
<a name="line-87"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Writer</span>   <span class='hs-layout'>(</span> <span class='hs-conid'>WriterT</span>  <span class='hs-layout'>)</span>
<a name="line-88"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>RWS</span>      <span class='hs-layout'>(</span> <span class='hs-conid'>RWST</span>     <span class='hs-layout'>)</span>
<a name="line-89"></a>
<a name="line-90"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Cont</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span>   <span class='hs-layout'>(</span> <span class='hs-conid'>MonadCont</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-91"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span>  <span class='hs-layout'>(</span> <span class='hs-conid'>MonadError</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-92"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>RWS</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span>    <span class='hs-layout'>(</span> <span class='hs-conid'>MonadRWS</span> <span class='hs-layout'>)</span>
<a name="line-93"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Reader</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span> <span class='hs-layout'>(</span> <span class='hs-conid'>MonadReader</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-94"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span>  <span class='hs-layout'>(</span> <span class='hs-conid'>MonadState</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-95"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Writer</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span> <span class='hs-layout'>(</span> <span class='hs-conid'>MonadWriter</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-96"></a>
<a name="line-97"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Word</span> <span class='hs-layout'>(</span><span class='hs-conid'>Word</span><span class='hs-layout'>)</span>
<a name="line-98"></a>
<a name="line-99"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>RWS</span><span class='hs-varop'>.</span><span class='hs-conid'>Strict</span>    <span class='hs-keyword'>as</span> <span class='hs-conid'>Strict</span> <span class='hs-layout'>(</span> <span class='hs-conid'>RWST</span>   <span class='hs-layout'>)</span>
<a name="line-100"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span><span class='hs-varop'>.</span><span class='hs-conid'>Strict</span>  <span class='hs-keyword'>as</span> <span class='hs-conid'>Strict</span> <span class='hs-layout'>(</span> <span class='hs-conid'>StateT</span> <span class='hs-layout'>)</span>
<a name="line-101"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Writer</span><span class='hs-varop'>.</span><span class='hs-conid'>Strict</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Strict</span> <span class='hs-layout'>(</span> <span class='hs-conid'>WriterT</span> <span class='hs-layout'>)</span>
<a name="line-102"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Concurrent</span> <span class='hs-layout'>(</span><span class='hs-conid'>ThreadId</span><span class='hs-layout'>,</span> <span class='hs-varid'>forkIO</span><span class='hs-layout'>)</span>
<a name="line-103"></a>
<a name="line-104"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>ST</span> <span class='hs-layout'>(</span><span class='hs-conid'>ST</span><span class='hs-layout'>)</span>
<a name="line-105"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ &gt;= 704</span>
<a name="line-106"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>ST</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeIOToST</span><span class='hs-layout'>)</span>
<a name="line-107"></a><span class='hs-cpp'>#else</span>
<a name="line-108"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>ST</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeIOToST</span><span class='hs-layout'>)</span>
<a name="line-109"></a><span class='hs-cpp'>#endif</span>
<a name="line-110"></a>
<a name="line-111"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ &gt;= 704</span>
<a name="line-112"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>ST</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>LazyUnsafe</span>
<a name="line-113"></a><span class='hs-cpp'>#else</span>
<a name="line-114"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>ST</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>LazyUnsafe</span>
<a name="line-115"></a><span class='hs-cpp'>#endif</span>
<a name="line-116"></a>
<a name="line-117"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>ST</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Lazy</span>
<a name="line-118"></a>
<a name="line-119"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Functor</span><span class='hs-varop'>.</span><span class='hs-conid'>Identity</span> <span class='hs-layout'>(</span><span class='hs-conid'>Identity</span><span class='hs-layout'>,</span> <span class='hs-varid'>runIdentity</span><span class='hs-layout'>)</span>
<a name="line-120"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Morph</span>
<a name="line-121"></a>
<a name="line-122"></a><a name="ReleaseKey"></a><span class='hs-comment'>-- | A lookup key for a specific release action. This value is returned by</span>
<a name="line-123"></a><a name="ReleaseKey"></a><span class='hs-comment'>-- 'register' and 'allocate', and is passed to 'release'.</span>
<a name="line-124"></a><a name="ReleaseKey"></a><span class='hs-comment'>--</span>
<a name="line-125"></a><a name="ReleaseKey"></a><span class='hs-comment'>-- Since 0.3.0</span>
<a name="line-126"></a><a name="ReleaseKey"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ReleaseKey</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ReleaseKey</span> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span> <span class='hs-conid'>ReleaseMap</span><span class='hs-layout'>)</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span>
<a name="line-127"></a>    <span class='hs-keyword'>deriving</span> <span class='hs-conid'>Typeable</span>
<a name="line-128"></a>
<a name="line-129"></a><a name="RefCount"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>RefCount</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Word</span>
<a name="line-130"></a><a name="NextKey"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>NextKey</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Int</span>
<a name="line-131"></a>
<a name="line-132"></a><a name="ReleaseMap"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ReleaseMap</span> <span class='hs-keyglyph'>=</span>
<a name="line-133"></a>    <span class='hs-conid'>ReleaseMap</span> <span class='hs-varop'>!</span><span class='hs-conid'>NextKey</span> <span class='hs-varop'>!</span><span class='hs-conid'>RefCount</span> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>IntMap</span> <span class='hs-layout'>(</span><span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-134"></a>  <span class='hs-keyglyph'>|</span> <span class='hs-conid'>ReleaseMapClosed</span>
<a name="line-135"></a>
<a name="line-136"></a><a name="ResourceT"></a><span class='hs-comment'>-- | The Resource transformer. This transformer keeps track of all registered</span>
<a name="line-137"></a><a name="ResourceT"></a><span class='hs-comment'>-- actions, and calls them upon exit (via 'runResourceT'). Actions may be</span>
<a name="line-138"></a><a name="ResourceT"></a><span class='hs-comment'>-- registered via 'register', or resources may be allocated atomically via</span>
<a name="line-139"></a><a name="ResourceT"></a><span class='hs-comment'>-- 'allocate'. @allocate@ corresponds closely to @bracket@.</span>
<a name="line-140"></a><a name="ResourceT"></a><span class='hs-comment'>--</span>
<a name="line-141"></a><a name="ResourceT"></a><span class='hs-comment'>-- Releasing may be performed before exit via the 'release' function. This is a</span>
<a name="line-142"></a><a name="ResourceT"></a><span class='hs-comment'>-- highly recommended optimization, as it will ensure that scarce resources are</span>
<a name="line-143"></a><a name="ResourceT"></a><span class='hs-comment'>-- freed early. Note that calling @release@ will deregister the action, so that</span>
<a name="line-144"></a><a name="ResourceT"></a><span class='hs-comment'>-- a release action will only ever be called once.</span>
<a name="line-145"></a><a name="ResourceT"></a><span class='hs-comment'>--</span>
<a name="line-146"></a><a name="ResourceT"></a><span class='hs-comment'>-- Since 0.3.0</span>
<a name="line-147"></a><a name="ResourceT"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-layout'>{</span> <span class='hs-varid'>unResourceT</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span> <span class='hs-conid'>ReleaseMap</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-layout'>}</span>
<a name="line-148"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ &gt;= 707</span>
<a name="line-149"></a>        <span class='hs-keyword'>deriving</span> <span class='hs-conid'>Typeable</span>
<a name="line-150"></a><span class='hs-cpp'>#else</span>
<a name="line-151"></a><a name="instance%20Typeable1%20(ResourceT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Typeable1</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>Typeable1</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-152"></a>    <span class='hs-varid'>typeOf1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>goType</span> <span class='hs-varid'>undefined</span>
<a name="line-153"></a>      <span class='hs-keyword'>where</span>
<a name="line-154"></a>        <span class='hs-varid'>goType</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Typeable1</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>TypeRep</span>
<a name="line-155"></a>        <span class='hs-varid'>goType</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span>
<a name="line-156"></a>            <span class='hs-varid'>mkTyConApp</span>
<a name="line-157"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ &gt;= 704</span>
<a name="line-158"></a>                <span class='hs-layout'>(</span><span class='hs-varid'>mkTyCon3</span> <span class='hs-str'>"resourcet"</span> <span class='hs-str'>"Control.Monad.Trans.Resource"</span> <span class='hs-str'>"ResourceT"</span><span class='hs-layout'>)</span>
<a name="line-159"></a><span class='hs-cpp'>#else</span>
<a name="line-160"></a>                <span class='hs-layout'>(</span><span class='hs-varid'>mkTyCon</span> <span class='hs-str'>"Control.Monad.Trans.Resource.ResourceT"</span><span class='hs-layout'>)</span>
<a name="line-161"></a><span class='hs-cpp'>#endif</span>
<a name="line-162"></a>                <span class='hs-keyglyph'>[</span> <span class='hs-varid'>typeOf1</span> <span class='hs-varid'>m</span>
<a name="line-163"></a>                <span class='hs-keyglyph'>]</span>
<a name="line-164"></a><span class='hs-cpp'>#endif</span>
<a name="line-165"></a>
<a name="line-166"></a><a name="ResIO"></a><span class='hs-comment'>-- | Convenient alias for @ResourceT IO@.</span>
<a name="line-167"></a><a name="ResIO"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>ResIO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-168"></a>
<a name="line-169"></a>
<a name="line-170"></a><a name="instance%20MonadCont%20(ResourceT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadCont</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadCont</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-171"></a>  <span class='hs-varid'>callCC</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>i</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>callCC</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>unResourceT</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>const</span> <span class='hs-varop'>.</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>i</span>
<a name="line-172"></a>
<a name="line-173"></a><a name="instance%20MonadError%20e%20(ResourceT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadError</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadError</span> <span class='hs-varid'>e</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-174"></a>  <span class='hs-varid'>throwError</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>throwError</span>
<a name="line-175"></a>  <span class='hs-varid'>catchError</span> <span class='hs-varid'>r</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>i</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>unResourceT</span> <span class='hs-varid'>r</span> <span class='hs-varid'>i</span> <span class='hs-varop'>`catchError`</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>unResourceT</span> <span class='hs-layout'>(</span><span class='hs-varid'>h</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varid'>i</span>
<a name="line-176"></a>
<a name="line-177"></a><a name="instance%20MonadRWS%20r%20w%20s%20(ResourceT%20m)%20instance%20MonadReader%20r%20m%20=%3e%20MonadReader%20r%20(ResourceT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadRWS</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadRWS</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-178"></a>
<a name="line-179"></a><a name="instance%20MonadReader%20r%20(ResourceT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadReader</span> <span class='hs-varid'>r</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadReader</span> <span class='hs-varid'>r</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-180"></a>  <span class='hs-varid'>ask</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varid'>ask</span>
<a name="line-181"></a>  <span class='hs-varid'>local</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mapResourceT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>local</span>
<a name="line-182"></a>
<a name="line-183"></a><a name="mapResourceT"></a><span class='hs-definition'>mapResourceT</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>n</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>n</span> <span class='hs-varid'>b</span>
<a name="line-184"></a><span class='hs-definition'>mapResourceT</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>.</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unResourceT</span>
<a name="line-185"></a>
<a name="line-186"></a><a name="instance%20MonadState%20s%20(ResourceT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadState</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadState</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-187"></a>  <span class='hs-varid'>get</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varid'>get</span>
<a name="line-188"></a>  <span class='hs-varid'>put</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>put</span>
<a name="line-189"></a>
<a name="line-190"></a><a name="instance%20MonadWriter%20w%20(ResourceT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadWriter</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadWriter</span> <span class='hs-varid'>w</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-191"></a>  <span class='hs-varid'>tell</span>   <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>tell</span>
<a name="line-192"></a>  <span class='hs-varid'>listen</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mapResourceT</span> <span class='hs-varid'>listen</span>
<a name="line-193"></a>  <span class='hs-varid'>pass</span>   <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mapResourceT</span> <span class='hs-varid'>pass</span>
<a name="line-194"></a>
<a name="line-195"></a>
<a name="line-196"></a><a name="MonadResource"></a><span class='hs-comment'>-- | A @Monad@ which allows for safe resource allocation. In theory, any monad</span>
<a name="line-197"></a><a name="MonadResource"></a><span class='hs-comment'>-- transformer stack included a @ResourceT@ can be an instance of</span>
<a name="line-198"></a><a name="MonadResource"></a><span class='hs-comment'>-- @MonadResource@.</span>
<a name="line-199"></a><a name="MonadResource"></a><span class='hs-comment'>--</span>
<a name="line-200"></a><a name="MonadResource"></a><span class='hs-comment'>-- Note: @runResourceT@ has a requirement for a @MonadBaseControl IO m@ monad,</span>
<a name="line-201"></a><a name="MonadResource"></a><span class='hs-comment'>-- which allows control operations to be lifted. A @MonadResource@ does not</span>
<a name="line-202"></a><a name="MonadResource"></a><span class='hs-comment'>-- have this requirement. This means that transformers such as @ContT@ can be</span>
<a name="line-203"></a><a name="MonadResource"></a><span class='hs-comment'>-- an instance of @MonadResource@. However, the @ContT@ wrapper will need to be</span>
<a name="line-204"></a><a name="MonadResource"></a><span class='hs-comment'>-- unwrapped before calling @runResourceT@.</span>
<a name="line-205"></a><a name="MonadResource"></a><span class='hs-comment'>--</span>
<a name="line-206"></a><a name="MonadResource"></a><span class='hs-comment'>-- Since 0.3.0</span>
<a name="line-207"></a><a name="MonadResource"></a><span class='hs-keyword'>class</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadUnsafeIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Applicative</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadResource</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>where</span>
<a name="line-208"></a>    <span class='hs-comment'>-- | Lift a @ResourceT IO@ action into the current @Monad@.</span>
<a name="line-209"></a>    <span class='hs-comment'>--</span>
<a name="line-210"></a>    <span class='hs-comment'>-- Since 0.4.0</span>
<a name="line-211"></a>    <span class='hs-varid'>liftResourceT</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ResourceT</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-212"></a>
<a name="line-213"></a><a name="register"></a><span class='hs-comment'>-- | Register some action that will be called precisely once, either when</span>
<a name="line-214"></a><span class='hs-comment'>-- 'runResourceT' is called, or when the 'ReleaseKey' is passed to 'release'.</span>
<a name="line-215"></a><span class='hs-comment'>--</span>
<a name="line-216"></a><span class='hs-comment'>-- Since 0.3.0</span>
<a name="line-217"></a><span class='hs-definition'>register</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadResource</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>ReleaseKey</span>
<a name="line-218"></a><span class='hs-definition'>register</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftResourceT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>registerRIO</span>
<a name="line-219"></a>
<a name="line-220"></a><a name="release"></a><span class='hs-comment'>-- | Call a release action early, and deregister it from the list of cleanup</span>
<a name="line-221"></a><span class='hs-comment'>-- actions to be performed.</span>
<a name="line-222"></a><span class='hs-comment'>--</span>
<a name="line-223"></a><span class='hs-comment'>-- Since 0.3.0</span>
<a name="line-224"></a><span class='hs-definition'>release</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>ReleaseKey</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-225"></a><span class='hs-definition'>release</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReleaseKey</span> <span class='hs-varid'>istate</span> <span class='hs-varid'>rk</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>release'</span> <span class='hs-varid'>istate</span> <span class='hs-varid'>rk</span>  
<a name="line-226"></a>    <span class='hs-layout'>(</span><span class='hs-varid'>maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>id</span><span class='hs-layout'>)</span>
<a name="line-227"></a>
<a name="line-228"></a><a name="unprotect"></a><span class='hs-comment'>-- | Unprotect resource from cleanup actions, this allowes you to send</span>
<a name="line-229"></a><span class='hs-comment'>-- resource into another resourcet process and reregister it there.</span>
<a name="line-230"></a><span class='hs-comment'>-- It returns an release action that should be run in order to clean </span>
<a name="line-231"></a><span class='hs-comment'>-- resource or Nothing in case if resource is already freed.</span>
<a name="line-232"></a><span class='hs-comment'>--</span>
<a name="line-233"></a><span class='hs-comment'>-- Since 0.4.5</span>
<a name="line-234"></a><span class='hs-definition'>unprotect</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>ReleaseKey</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-235"></a><span class='hs-definition'>unprotect</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReleaseKey</span> <span class='hs-varid'>istate</span> <span class='hs-varid'>rk</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>release'</span> <span class='hs-varid'>istate</span> <span class='hs-varid'>rk</span> <span class='hs-varid'>return</span>
<a name="line-236"></a>
<a name="line-237"></a><a name="allocate"></a><span class='hs-comment'>-- | Perform some allocation, and automatically register a cleanup action.</span>
<a name="line-238"></a><span class='hs-comment'>--</span>
<a name="line-239"></a><span class='hs-comment'>-- This is almost identical to calling the allocation and then</span>
<a name="line-240"></a><span class='hs-comment'>-- @register@ing the release action, but this properly handles masking of</span>
<a name="line-241"></a><span class='hs-comment'>-- asynchronous exceptions.</span>
<a name="line-242"></a><span class='hs-comment'>--</span>
<a name="line-243"></a><span class='hs-comment'>-- Since 0.3.0</span>
<a name="line-244"></a><span class='hs-definition'>allocate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadResource</span> <span class='hs-varid'>m</span>
<a name="line-245"></a>         <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ allocate</span>
<a name="line-246"></a>         <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ free resource</span>
<a name="line-247"></a>         <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReleaseKey</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-248"></a><span class='hs-definition'>allocate</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftResourceT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>allocateRIO</span> <span class='hs-varid'>a</span>
<a name="line-249"></a>
<a name="line-250"></a><a name="resourceMask"></a><span class='hs-comment'>-- | Perform asynchronous exception masking.</span>
<a name="line-251"></a><span class='hs-comment'>--</span>
<a name="line-252"></a><span class='hs-comment'>-- This is more general then @Control.Exception.mask@, yet more efficient</span>
<a name="line-253"></a><span class='hs-comment'>-- than @Control.Exception.Lifted.mask@.</span>
<a name="line-254"></a><span class='hs-comment'>--</span>
<a name="line-255"></a><span class='hs-comment'>-- Since 0.3.0</span>
<a name="line-256"></a><span class='hs-definition'>resourceMask</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadResource</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>a</span><span class='hs-varop'>.</span> <span class='hs-conid'>ResourceT</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span>
<a name="line-257"></a><span class='hs-definition'>resourceMask</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftResourceT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>resourceMaskRIO</span>
<a name="line-258"></a>
<a name="line-259"></a><a name="instance%20MonadResource%20(ResourceT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadUnsafeIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Applicative</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadResource</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-260"></a>    <span class='hs-varid'>liftResourceT</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>transResourceT</span> <span class='hs-varid'>liftIO</span>
<a name="line-261"></a>
<a name="line-262"></a><a name="allocateRIO"></a><span class='hs-definition'>allocateRIO</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReleaseKey</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-263"></a><span class='hs-definition'>allocateRIO</span> <span class='hs-varid'>acquire</span> <span class='hs-varid'>rel</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>istate</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>mask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>restore</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>do</span>
<a name="line-264"></a>    <span class='hs-varid'>a</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>restore</span> <span class='hs-varid'>acquire</span>
<a name="line-265"></a>    <span class='hs-varid'>key</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>register'</span> <span class='hs-varid'>istate</span> <span class='hs-varop'>$</span> <span class='hs-varid'>rel</span> <span class='hs-varid'>a</span>
<a name="line-266"></a>    <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>key</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-267"></a>
<a name="line-268"></a><a name="registerRIO"></a><span class='hs-definition'>registerRIO</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>ReleaseKey</span>
<a name="line-269"></a><span class='hs-definition'>registerRIO</span> <span class='hs-varid'>rel</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>istate</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>register'</span> <span class='hs-varid'>istate</span> <span class='hs-varid'>rel</span>
<a name="line-270"></a>
<a name="line-271"></a><a name="resourceMaskRIO"></a><span class='hs-definition'>resourceMaskRIO</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>a</span><span class='hs-varop'>.</span> <span class='hs-conid'>ResourceT</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>b</span>
<a name="line-272"></a><span class='hs-definition'>resourceMaskRIO</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>istate</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>mask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>restore</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-273"></a>    <span class='hs-keyword'>let</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>f'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>go</span> <span class='hs-varid'>restore</span><span class='hs-layout'>)</span>
<a name="line-274"></a>     <span class='hs-keyword'>in</span> <span class='hs-varid'>f'</span> <span class='hs-varid'>istate</span>
<a name="line-275"></a>  <span class='hs-keyword'>where</span>
<a name="line-276"></a>    <span class='hs-varid'>go</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>a</span><span class='hs-varop'>.</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>a</span><span class='hs-varop'>.</span> <span class='hs-conid'>ResourceT</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-277"></a>    <span class='hs-varid'>go</span> <span class='hs-varid'>r</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>i</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>r</span> <span class='hs-layout'>(</span><span class='hs-varid'>g</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-278"></a>
<a name="line-279"></a><span class='hs-cpp'>#define GO(T) instance (MonadResource m) =&gt; MonadResource (T m) where liftResourceT = lift . liftResourceT</span>
<a name="line-280"></a><span class='hs-cpp'>#define GOX(X, T) instance (X, MonadResource m) =&gt; MonadResource (T m) where liftResourceT = lift . liftResourceT</span>
<a name="line-281"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span><span class='hs-layout'>)</span>
<a name="line-282"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>ListT</span><span class='hs-layout'>)</span>
<a name="line-283"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>MaybeT</span><span class='hs-layout'>)</span>
<a name="line-284"></a><span class='hs-conid'>GOX</span><span class='hs-layout'>(</span><span class='hs-conid'>Error</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-conid'>ErrorT</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-285"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-286"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>ContT</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-287"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-288"></a><span class='hs-conid'>GOX</span><span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span>
<a name="line-289"></a><span class='hs-conid'>GOX</span><span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-290"></a><span class='hs-conid'>GOX</span><span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-291"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-292"></a><span class='hs-conid'>GOX</span><span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span>
<a name="line-293"></a><span class='hs-cpp'>#undef GO</span>
<a name="line-294"></a><span class='hs-cpp'>#undef GOX</span>
<a name="line-295"></a>
<a name="line-296"></a><a name="register'"></a><span class='hs-definition'>register'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span> <span class='hs-conid'>ReleaseMap</span>
<a name="line-297"></a>          <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-298"></a>          <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>ReleaseKey</span>
<a name="line-299"></a><span class='hs-definition'>register'</span> <span class='hs-varid'>istate</span> <span class='hs-varid'>rel</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>atomicModifyIORef</span> <span class='hs-varid'>istate</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>rm</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-300"></a>    <span class='hs-keyword'>case</span> <span class='hs-varid'>rm</span> <span class='hs-keyword'>of</span>
<a name="line-301"></a>        <span class='hs-conid'>ReleaseMap</span> <span class='hs-varid'>key</span> <span class='hs-varid'>rf</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-302"></a>            <span class='hs-layout'>(</span> <span class='hs-conid'>ReleaseMap</span> <span class='hs-layout'>(</span><span class='hs-varid'>key</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>rf</span> <span class='hs-layout'>(</span><span class='hs-conid'>IntMap</span><span class='hs-varop'>.</span><span class='hs-varid'>insert</span> <span class='hs-varid'>key</span> <span class='hs-varid'>rel</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-303"></a>            <span class='hs-layout'>,</span> <span class='hs-conid'>ReleaseKey</span> <span class='hs-varid'>istate</span> <span class='hs-varid'>key</span>
<a name="line-304"></a>            <span class='hs-layout'>)</span>
<a name="line-305"></a>        <span class='hs-conid'>ReleaseMapClosed</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>throw</span> <span class='hs-varop'>$</span> <span class='hs-conid'>InvalidAccess</span> <span class='hs-str'>"register'"</span>
<a name="line-306"></a>
<a name="line-307"></a><a name="InvalidAccess"></a><span class='hs-comment'>-- | Indicates either an error in the library, or misuse of it (e.g., a</span>
<a name="line-308"></a><a name="InvalidAccess"></a><span class='hs-comment'>-- @ResourceT@'s state is accessed after being released).</span>
<a name="line-309"></a><a name="InvalidAccess"></a><span class='hs-comment'>--</span>
<a name="line-310"></a><a name="InvalidAccess"></a><span class='hs-comment'>-- Since 0.3.0</span>
<a name="line-311"></a><a name="InvalidAccess"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>InvalidAccess</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>InvalidAccess</span> <span class='hs-layout'>{</span> <span class='hs-varid'>functionName</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-layout'>}</span>
<a name="line-312"></a>    <span class='hs-keyword'>deriving</span> <span class='hs-conid'>Typeable</span>
<a name="line-313"></a>
<a name="line-314"></a><a name="instance%20Show%20InvalidAccess"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Show</span> <span class='hs-conid'>InvalidAccess</span> <span class='hs-keyword'>where</span>
<a name="line-315"></a>    <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-conid'>InvalidAccess</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concat</span>
<a name="line-316"></a>        <span class='hs-keyglyph'>[</span> <span class='hs-str'>"Control.Monad.Trans.Resource."</span>
<a name="line-317"></a>        <span class='hs-layout'>,</span> <span class='hs-varid'>f</span>
<a name="line-318"></a>        <span class='hs-layout'>,</span> <span class='hs-str'>": The mutable state is being accessed after cleanup. Please contact the maintainers."</span>
<a name="line-319"></a>        <span class='hs-keyglyph'>]</span>
<a name="line-320"></a>
<a name="line-321"></a><a name="instance%20Exception%20InvalidAccess%20release'%20::%20I.IORef%20ReleaseMap%20-%3e%20Int%20-%3e%20(Maybe%20(IO%20())%20-%3e%20IO%20a)%20-%3e%20IO%20a%20release'%20istate%20key%20act%20=%20E.mask%20$%20%5crestore%20-%3e%20do%20maction%20%3c-%20I.atomicModifyIORef%20istate%20lookupAction%20restore%20(act%20maction)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Exception</span> <span class='hs-conid'>InvalidAccess</span>
<a name="line-322"></a>
<a name="line-323"></a><a name="release'"></a><span class='hs-definition'>release'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span> <span class='hs-conid'>ReleaseMap</span>
<a name="line-324"></a>         <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Int</span>
<a name="line-325"></a>         <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-326"></a>         <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-327"></a><span class='hs-definition'>release'</span> <span class='hs-varid'>istate</span> <span class='hs-varid'>key</span> <span class='hs-varid'>act</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>mask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>restore</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>do</span>
<a name="line-328"></a>    <span class='hs-varid'>maction</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>atomicModifyIORef</span> <span class='hs-varid'>istate</span> <span class='hs-varid'>lookupAction</span>
<a name="line-329"></a>    <span class='hs-varid'>restore</span> <span class='hs-layout'>(</span><span class='hs-varid'>act</span> <span class='hs-varid'>maction</span><span class='hs-layout'>)</span>
<a name="line-330"></a>  <span class='hs-keyword'>where</span>
<a name="line-331"></a>    <span class='hs-varid'>lookupAction</span> <span class='hs-varid'>rm</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>ReleaseMap</span> <span class='hs-varid'>next</span> <span class='hs-varid'>rf</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-332"></a>        <span class='hs-keyword'>case</span> <span class='hs-conid'>IntMap</span><span class='hs-varop'>.</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>key</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>of</span>
<a name="line-333"></a>            <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>rm</span><span class='hs-layout'>,</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-334"></a>            <span class='hs-conid'>Just</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-335"></a>                <span class='hs-layout'>(</span> <span class='hs-conid'>ReleaseMap</span> <span class='hs-varid'>next</span> <span class='hs-varid'>rf</span> <span class='hs-varop'>$</span> <span class='hs-conid'>IntMap</span><span class='hs-varop'>.</span><span class='hs-varid'>delete</span> <span class='hs-varid'>key</span> <span class='hs-varid'>m</span>
<a name="line-336"></a>                <span class='hs-layout'>,</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>action</span>
<a name="line-337"></a>                <span class='hs-layout'>)</span>
<a name="line-338"></a>    <span class='hs-comment'>-- We tried to call release, but since the state is already closed, we</span>
<a name="line-339"></a>    <span class='hs-comment'>-- can assume that the release action was already called. Previously,</span>
<a name="line-340"></a>    <span class='hs-comment'>-- this threw an exception, though given that @release@ can be called</span>
<a name="line-341"></a>    <span class='hs-comment'>-- from outside the context of a @ResourceT@ starting with version</span>
<a name="line-342"></a>    <span class='hs-comment'>-- 0.4.4, it's no longer a library misuse or a library bug.</span>
<a name="line-343"></a>    <span class='hs-varid'>lookupAction</span> <span class='hs-conid'>ReleaseMapClosed</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReleaseMapClosed</span><span class='hs-layout'>,</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-344"></a>
<a name="line-345"></a><a name="stateAlloc"></a><span class='hs-definition'>stateAlloc</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span> <span class='hs-conid'>ReleaseMap</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-346"></a><span class='hs-definition'>stateAlloc</span> <span class='hs-varid'>istate</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-347"></a>    <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>atomicModifyIORef</span> <span class='hs-varid'>istate</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>rm</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-348"></a>        <span class='hs-keyword'>case</span> <span class='hs-varid'>rm</span> <span class='hs-keyword'>of</span>
<a name="line-349"></a>            <span class='hs-conid'>ReleaseMap</span> <span class='hs-varid'>nk</span> <span class='hs-varid'>rf</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-350"></a>                <span class='hs-layout'>(</span><span class='hs-conid'>ReleaseMap</span> <span class='hs-varid'>nk</span> <span class='hs-layout'>(</span><span class='hs-varid'>rf</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-351"></a>            <span class='hs-conid'>ReleaseMapClosed</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>throw</span> <span class='hs-varop'>$</span> <span class='hs-conid'>InvalidAccess</span> <span class='hs-str'>"stateAlloc"</span>
<a name="line-352"></a>
<a name="line-353"></a><a name="stateCleanup"></a><span class='hs-definition'>stateCleanup</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span> <span class='hs-conid'>ReleaseMap</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-354"></a><span class='hs-definition'>stateCleanup</span> <span class='hs-varid'>istate</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>mask_</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-355"></a>    <span class='hs-varid'>mm</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>atomicModifyIORef</span> <span class='hs-varid'>istate</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>rm</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-356"></a>        <span class='hs-keyword'>case</span> <span class='hs-varid'>rm</span> <span class='hs-keyword'>of</span>
<a name="line-357"></a>            <span class='hs-conid'>ReleaseMap</span> <span class='hs-varid'>nk</span> <span class='hs-varid'>rf</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-358"></a>                <span class='hs-keyword'>let</span> <span class='hs-varid'>rf'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rf</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span>
<a name="line-359"></a>                 <span class='hs-keyword'>in</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>rf'</span> <span class='hs-varop'>==</span> <span class='hs-varid'>minBound</span>
<a name="line-360"></a>                        <span class='hs-keyword'>then</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReleaseMapClosed</span><span class='hs-layout'>,</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-361"></a>                        <span class='hs-keyword'>else</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReleaseMap</span> <span class='hs-varid'>nk</span> <span class='hs-varid'>rf'</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-362"></a>            <span class='hs-conid'>ReleaseMapClosed</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>throw</span> <span class='hs-varop'>$</span> <span class='hs-conid'>InvalidAccess</span> <span class='hs-str'>"stateCleanup"</span>
<a name="line-363"></a>    <span class='hs-keyword'>case</span> <span class='hs-varid'>mm</span> <span class='hs-keyword'>of</span>
<a name="line-364"></a>        <span class='hs-conid'>Just</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-365"></a>            <span class='hs-varid'>mapM_</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>try</span> <span class='hs-varid'>x</span> <span class='hs-varop'>&gt;&gt;</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-conid'>IntMap</span><span class='hs-varop'>.</span><span class='hs-varid'>elems</span> <span class='hs-varid'>m</span>
<a name="line-366"></a>        <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-367"></a>  <span class='hs-keyword'>where</span>
<a name="line-368"></a>    <span class='hs-varid'>try</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-conid'>SomeException</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-369"></a>    <span class='hs-varid'>try</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>try</span>
<a name="line-370"></a>
<a name="line-371"></a><a name="runResourceT"></a><span class='hs-comment'>-- | Unwrap a 'ResourceT' transformer, and call all registered release actions.</span>
<a name="line-372"></a><span class='hs-comment'>--</span>
<a name="line-373"></a><span class='hs-comment'>-- Note that there is some reference counting involved due to 'resourceForkIO'.</span>
<a name="line-374"></a><span class='hs-comment'>-- If multiple threads are sharing the same collection of resources, only the</span>
<a name="line-375"></a><span class='hs-comment'>-- last call to @runResourceT@ will deallocate the resources.</span>
<a name="line-376"></a><span class='hs-comment'>--</span>
<a name="line-377"></a><span class='hs-comment'>-- Since 0.3.0</span>
<a name="line-378"></a><span class='hs-definition'>runResourceT</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadBaseControl</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-379"></a><span class='hs-definition'>runResourceT</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-380"></a>    <span class='hs-varid'>istate</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>liftBase</span> <span class='hs-varop'>$</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>newIORef</span>
<a name="line-381"></a>        <span class='hs-varop'>$</span> <span class='hs-conid'>ReleaseMap</span> <span class='hs-varid'>maxBound</span> <span class='hs-varid'>minBound</span> <span class='hs-conid'>IntMap</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span>
<a name="line-382"></a>    <span class='hs-varid'>bracket_</span>
<a name="line-383"></a>        <span class='hs-layout'>(</span><span class='hs-varid'>stateAlloc</span> <span class='hs-varid'>istate</span><span class='hs-layout'>)</span>
<a name="line-384"></a>        <span class='hs-layout'>(</span><span class='hs-varid'>stateCleanup</span> <span class='hs-varid'>istate</span><span class='hs-layout'>)</span>
<a name="line-385"></a>        <span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-varid'>istate</span><span class='hs-layout'>)</span>
<a name="line-386"></a>
<a name="line-387"></a><a name="bracket_"></a><span class='hs-definition'>bracket_</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadBaseControl</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-388"></a><span class='hs-definition'>bracket_</span> <span class='hs-varid'>alloc</span> <span class='hs-varid'>cleanup</span> <span class='hs-varid'>inside</span> <span class='hs-keyglyph'>=</span>
<a name="line-389"></a>    <span class='hs-varid'>control</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>run</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>bracket_</span> <span class='hs-varid'>alloc</span> <span class='hs-varid'>cleanup</span> <span class='hs-layout'>(</span><span class='hs-varid'>run</span> <span class='hs-varid'>inside</span><span class='hs-layout'>)</span>
<a name="line-390"></a>
<a name="line-391"></a><a name="transResourceT"></a><span class='hs-comment'>-- | Transform the monad a @ResourceT@ lives in. This is most often used to</span>
<a name="line-392"></a><span class='hs-comment'>-- strip or add new transformers to a stack, e.g. to run a @ReaderT@.</span>
<a name="line-393"></a><span class='hs-comment'>--</span>
<a name="line-394"></a><span class='hs-comment'>-- Note that this function is a slight generalization of 'hoist'.</span>
<a name="line-395"></a><span class='hs-comment'>--</span>
<a name="line-396"></a><span class='hs-comment'>-- Since 0.3.0</span>
<a name="line-397"></a><span class='hs-definition'>transResourceT</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>n</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-398"></a>               <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-399"></a>               <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>n</span> <span class='hs-varid'>b</span>
<a name="line-400"></a><span class='hs-definition'>transResourceT</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>mx</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>mx</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-401"></a>
<a name="line-402"></a><a name="instance%20MFunctor%20ResourceT"></a><span class='hs-comment'>-- | Since 0.4.7</span>
<a name="line-403"></a><a name="instance%20MFunctor%20ResourceT"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MFunctor</span> <span class='hs-conid'>ResourceT</span> <span class='hs-keyword'>where</span>
<a name="line-404"></a>    <span class='hs-varid'>hoist</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>mx</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>mx</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-405"></a><a name="instance%20MMonad%20ResourceT"></a><span class='hs-comment'>-- | Since 0.4.7</span>
<a name="line-406"></a><a name="instance%20MMonad%20ResourceT"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MMonad</span> <span class='hs-conid'>ResourceT</span> <span class='hs-keyword'>where</span>
<a name="line-407"></a>    <span class='hs-varid'>embed</span> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>i</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>unResourceT</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>unResourceT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span>
<a name="line-408"></a>
<a name="line-409"></a><a name="joinResourceT"></a><span class='hs-comment'>-- | This function mirrors @join@ at the transformer level: it will collapse</span>
<a name="line-410"></a><span class='hs-comment'>-- two levels of @ResourceT@ into a single @ResourceT@.</span>
<a name="line-411"></a><span class='hs-comment'>--</span>
<a name="line-412"></a><span class='hs-comment'>-- Since 0.4.6</span>
<a name="line-413"></a><span class='hs-definition'>joinResourceT</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ResourceT</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-414"></a>              <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-415"></a><span class='hs-definition'>joinResourceT</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>unResourceT</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span>
<a name="line-416"></a>
<a name="line-417"></a><a name="instance%20Functor%20(ResourceT%20m)"></a><span class='hs-comment'>-------- All of our monad et al instances</span>
<a name="line-418"></a><a name="instance%20Functor%20(ResourceT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Functor</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>Functor</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-419"></a>    <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-420"></a>
<a name="line-421"></a><a name="instance%20Applicative%20(ResourceT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Applicative</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>Applicative</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-422"></a>    <span class='hs-varid'>pure</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>const</span> <span class='hs-varop'>.</span> <span class='hs-varid'>pure</span>
<a name="line-423"></a>    <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>mf</span> <span class='hs-varop'>&lt;*&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>ma</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-424"></a>        <span class='hs-varid'>mf</span> <span class='hs-varid'>r</span> <span class='hs-varop'>&lt;*&gt;</span> <span class='hs-varid'>ma</span> <span class='hs-varid'>r</span>
<a name="line-425"></a>
<a name="line-426"></a><a name="instance%20Monad%20(ResourceT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-427"></a>    <span class='hs-varid'>return</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>const</span> <span class='hs-varop'>.</span> <span class='hs-varid'>return</span>
<a name="line-428"></a>    <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>ma</span> <span class='hs-varop'>&gt;&gt;=</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>do</span>
<a name="line-429"></a>        <span class='hs-varid'>a</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>ma</span> <span class='hs-varid'>r</span>
<a name="line-430"></a>        <span class='hs-keyword'>let</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>f'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span>
<a name="line-431"></a>        <span class='hs-varid'>f'</span> <span class='hs-varid'>r</span>
<a name="line-432"></a>
<a name="line-433"></a><a name="instance%20MonadTrans%20ResourceT"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadTrans</span> <span class='hs-conid'>ResourceT</span> <span class='hs-keyword'>where</span>
<a name="line-434"></a>    <span class='hs-varid'>lift</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>const</span>
<a name="line-435"></a>
<a name="line-436"></a><a name="instance%20MonadIO%20(ResourceT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-437"></a>    <span class='hs-varid'>liftIO</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>liftIO</span>
<a name="line-438"></a>
<a name="line-439"></a><a name="instance%20MonadBase%20b%20(ResourceT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadBase</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadBase</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-440"></a>    <span class='hs-varid'>liftBase</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>liftBase</span>
<a name="line-441"></a>
<a name="line-442"></a><a name="instance%20MonadTransControl%20ResourceT"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadTransControl</span> <span class='hs-conid'>ResourceT</span> <span class='hs-keyword'>where</span>
<a name="line-443"></a>    <span class='hs-keyword'>newtype</span> <span class='hs-conid'>StT</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StReader</span> <span class='hs-layout'>{</span><span class='hs-varid'>unStReader</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span><span class='hs-layout'>}</span>
<a name="line-444"></a>    <span class='hs-varid'>liftWith</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>StReader</span> <span class='hs-varop'>$</span> <span class='hs-varid'>t</span> <span class='hs-varid'>r</span>
<a name="line-445"></a>    <span class='hs-varid'>restoreT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>const</span> <span class='hs-varop'>.</span> <span class='hs-varid'>liftM</span> <span class='hs-varid'>unStReader</span>
<a name="line-446"></a>    <span class='hs-comment'>{-# INLINE liftWith #-}</span>
<a name="line-447"></a>    <span class='hs-comment'>{-# INLINE restoreT #-}</span>
<a name="line-448"></a>
<a name="line-449"></a><a name="instance%20MonadBaseControl%20b%20(ResourceT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadBaseControl</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadBaseControl</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-450"></a>     <span class='hs-keyword'>newtype</span> <span class='hs-conid'>StM</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StMT</span> <span class='hs-layout'>(</span><span class='hs-conid'>StM</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-451"></a>     <span class='hs-varid'>liftBaseWith</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>reader</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-452"></a>         <span class='hs-varid'>liftBaseWith</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>runInBase</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-453"></a>             <span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>StMT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runInBase</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>r</span> <span class='hs-varid'>reader</span><span class='hs-layout'>)</span>
<a name="line-454"></a>     <span class='hs-varid'>restoreM</span> <span class='hs-layout'>(</span><span class='hs-conid'>StMT</span> <span class='hs-varid'>base</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>const</span> <span class='hs-varop'>$</span> <span class='hs-varid'>restoreM</span> <span class='hs-varid'>base</span>
<a name="line-455"></a><a name="instance%20MonadThrow%20(ExceptionT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-456"></a>    <span class='hs-varid'>monadThrow</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Left</span> <span class='hs-varop'>.</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>toException</span>
<a name="line-457"></a><a name="instance%20MonadResource%20(ExceptionT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadResource</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadResource</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-458"></a>    <span class='hs-varid'>liftResourceT</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>liftResourceT</span>
<a name="line-459"></a><a name="instance%20MonadIO%20(ExceptionT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-460"></a>    <span class='hs-varid'>liftIO</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>liftIO</span>
<a name="line-461"></a>
<a name="line-462"></a><a name="ExceptionT"></a><span class='hs-comment'>-- | The express purpose of this transformer is to allow non-@IO@-based monad</span>
<a name="line-463"></a><a name="ExceptionT"></a><span class='hs-comment'>-- stacks to catch exceptions via the 'MonadThrow' typeclass.</span>
<a name="line-464"></a><a name="ExceptionT"></a><span class='hs-comment'>--</span>
<a name="line-465"></a><a name="ExceptionT"></a><span class='hs-comment'>-- Since 0.3.0</span>
<a name="line-466"></a><a name="ExceptionT"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-layout'>{</span> <span class='hs-varid'>runExceptionT</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-conid'>SomeException</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-467"></a>
<a name="line-468"></a><a name="runExceptionT_"></a><span class='hs-comment'>-- | Same as 'runExceptionT', but immediately 'E.throw' any exception returned.</span>
<a name="line-469"></a><span class='hs-comment'>--</span>
<a name="line-470"></a><span class='hs-comment'>-- Since 0.3.0</span>
<a name="line-471"></a><span class='hs-definition'>runExceptionT_</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-472"></a><span class='hs-definition'>runExceptionT_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM</span> <span class='hs-layout'>(</span><span class='hs-varid'>either</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>throw</span> <span class='hs-varid'>id</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runExceptionT</span>
<a name="line-473"></a>
<a name="line-474"></a><a name="runException"></a><span class='hs-comment'>-- | Run an @ExceptionT Identity@ stack.</span>
<a name="line-475"></a><span class='hs-comment'>--</span>
<a name="line-476"></a><span class='hs-comment'>-- Since 0.4.2</span>
<a name="line-477"></a><span class='hs-definition'>runException</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-conid'>Identity</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>SomeException</span> <span class='hs-varid'>a</span>
<a name="line-478"></a><span class='hs-definition'>runException</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>runIdentity</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runExceptionT</span>
<a name="line-479"></a>
<a name="line-480"></a><a name="runException_"></a><span class='hs-comment'>-- | Run an @ExceptionT Identity@ stack, but immediately 'E.throw' any exception returned.</span>
<a name="line-481"></a><span class='hs-comment'>--</span>
<a name="line-482"></a><span class='hs-comment'>-- Since 0.4.2</span>
<a name="line-483"></a><span class='hs-definition'>runException_</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-conid'>Identity</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>a</span>
<a name="line-484"></a><span class='hs-definition'>runException_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>runIdentity</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runExceptionT_</span>
<a name="line-485"></a>
<a name="line-486"></a><a name="instance%20Functor%20(ExceptionT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>Functor</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-487"></a>    <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varid'>liftM</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fmap</span><span class='hs-layout'>)</span> <span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runExceptionT</span>
<a name="line-488"></a><a name="instance%20Applicative%20(ExceptionT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>Applicative</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-489"></a>    <span class='hs-varid'>pure</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Right</span>
<a name="line-490"></a>    <span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>mf</span> <span class='hs-varop'>&lt;*&gt;</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>ma</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-491"></a>        <span class='hs-varid'>ef</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>mf</span>
<a name="line-492"></a>        <span class='hs-keyword'>case</span> <span class='hs-varid'>ef</span> <span class='hs-keyword'>of</span>
<a name="line-493"></a>            <span class='hs-conid'>Left</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-494"></a>            <span class='hs-conid'>Right</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>do</span>
<a name="line-495"></a>                <span class='hs-varid'>ea</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>ma</span>
<a name="line-496"></a>                <span class='hs-keyword'>case</span> <span class='hs-varid'>ea</span> <span class='hs-keyword'>of</span>
<a name="line-497"></a>                    <span class='hs-conid'>Left</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-498"></a>                    <span class='hs-conid'>Right</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-499"></a><a name="instance%20Monad%20(ExceptionT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-500"></a>    <span class='hs-varid'>return</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>pure</span>
<a name="line-501"></a>    <span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>ma</span> <span class='hs-varop'>&gt;&gt;=</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-502"></a>        <span class='hs-varid'>ea</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>ma</span>
<a name="line-503"></a>        <span class='hs-keyword'>case</span> <span class='hs-varid'>ea</span> <span class='hs-keyword'>of</span>
<a name="line-504"></a>            <span class='hs-conid'>Left</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-505"></a>            <span class='hs-conid'>Right</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>runExceptionT</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-506"></a><a name="instance%20MonadBase%20b%20(ExceptionT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadBase</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadBase</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-507"></a>    <span class='hs-varid'>liftBase</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>liftBase</span>
<a name="line-508"></a><a name="instance%20MonadTrans%20ExceptionT"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadTrans</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-keyword'>where</span>
<a name="line-509"></a>    <span class='hs-varid'>lift</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>Right</span>
<a name="line-510"></a><a name="instance%20MonadTransControl%20ExceptionT"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadTransControl</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-keyword'>where</span>
<a name="line-511"></a>    <span class='hs-keyword'>newtype</span> <span class='hs-conid'>StT</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StExc</span> <span class='hs-layout'>{</span> <span class='hs-varid'>unStExc</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>SomeException</span> <span class='hs-varid'>a</span> <span class='hs-layout'>}</span>
<a name="line-512"></a>    <span class='hs-varid'>liftWith</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>liftM</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>StExc</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runExceptionT</span>
<a name="line-513"></a>    <span class='hs-varid'>restoreT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>liftM</span> <span class='hs-varid'>unStExc</span>
<a name="line-514"></a><a name="instance%20MonadBaseControl%20b%20(ExceptionT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadBaseControl</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadBaseControl</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-515"></a>    <span class='hs-keyword'>newtype</span> <span class='hs-conid'>StM</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StE</span> <span class='hs-layout'>{</span> <span class='hs-varid'>unStE</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ComposeSt</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-layout'>}</span>
<a name="line-516"></a>    <span class='hs-varid'>liftBaseWith</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defaultLiftBaseWith</span> <span class='hs-conid'>StE</span>
<a name="line-517"></a>    <span class='hs-varid'>restoreM</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defaultRestoreM</span> <span class='hs-varid'>unStE</span>
<a name="line-518"></a>
<a name="line-519"></a><a name="instance%20MonadCont%20(ExceptionT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadCont</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadCont</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-520"></a>  <span class='hs-varid'>callCC</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>$</span>
<a name="line-521"></a>    <span class='hs-varid'>callCC</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-522"></a>    <span class='hs-varid'>runExceptionT</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>c</span> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-523"></a>
<a name="line-524"></a><a name="instance%20MonadError%20e%20(ExceptionT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadError</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadError</span> <span class='hs-varid'>e</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-525"></a>  <span class='hs-varid'>throwError</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>throwError</span>
<a name="line-526"></a>  <span class='hs-varid'>catchError</span> <span class='hs-varid'>r</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runExceptionT</span> <span class='hs-varid'>r</span> <span class='hs-varop'>`catchError`</span> <span class='hs-layout'>(</span><span class='hs-varid'>runExceptionT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>h</span><span class='hs-layout'>)</span>
<a name="line-527"></a>
<a name="line-528"></a><a name="instance%20MonadRWS%20r%20w%20s%20(ExceptionT%20m)%20instance%20MonadReader%20r%20m%20=%3e%20MonadReader%20r%20(ExceptionT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadRWS</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadRWS</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-529"></a>
<a name="line-530"></a><a name="instance%20MonadReader%20r%20(ExceptionT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadReader</span> <span class='hs-varid'>r</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadReader</span> <span class='hs-varid'>r</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-531"></a>  <span class='hs-varid'>ask</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varid'>ask</span>
<a name="line-532"></a>  <span class='hs-varid'>local</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mapExceptionT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>local</span>
<a name="line-533"></a>
<a name="line-534"></a><a name="mapExceptionT"></a><span class='hs-definition'>mapExceptionT</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-conid'>SomeException</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-conid'>SomeException</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>n</span> <span class='hs-varid'>b</span>
<a name="line-535"></a><span class='hs-definition'>mapExceptionT</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptionT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runExceptionT</span>
<a name="line-536"></a>
<a name="line-537"></a><a name="instance%20MonadState%20s%20(ExceptionT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadState</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadState</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-538"></a>  <span class='hs-varid'>get</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varid'>get</span>
<a name="line-539"></a>  <span class='hs-varid'>put</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>put</span>
<a name="line-540"></a>
<a name="line-541"></a><a name="instance%20MonadWriter%20w%20(ExceptionT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadWriter</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadWriter</span> <span class='hs-varid'>w</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptionT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-542"></a>  <span class='hs-varid'>tell</span>   <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>tell</span>
<a name="line-543"></a>  <span class='hs-varid'>listen</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mapExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>do</span>
<a name="line-544"></a>    <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>listen</span> <span class='hs-varid'>m</span>
<a name="line-545"></a>    <span class='hs-varid'>return</span> <span class='hs-varop'>$!</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-546"></a>  <span class='hs-varid'>pass</span>   <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mapExceptionT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>pass</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-547"></a>    <span class='hs-varid'>a</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>m</span>
<a name="line-548"></a>    <span class='hs-varid'>return</span> <span class='hs-varop'>$!</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>of</span>
<a name="line-549"></a>        <span class='hs-conid'>Left</span>  <span class='hs-varid'>l</span>      <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span>  <span class='hs-varid'>l</span><span class='hs-layout'>,</span> <span class='hs-varid'>id</span><span class='hs-layout'>)</span>
<a name="line-550"></a>        <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-551"></a>
<a name="line-552"></a><a name="MonadThrow"></a><span class='hs-comment'>-- | A @Monad@ which can throw exceptions. Note that this does not work in a</span>
<a name="line-553"></a><a name="MonadThrow"></a><span class='hs-comment'>-- vanilla @ST@ or @Identity@ monad. Instead, you should use the 'ExceptionT'</span>
<a name="line-554"></a><a name="MonadThrow"></a><span class='hs-comment'>-- transformer in your stack if you are dealing with a non-@IO@ base monad.</span>
<a name="line-555"></a><a name="MonadThrow"></a><span class='hs-comment'>--</span>
<a name="line-556"></a><a name="MonadThrow"></a><span class='hs-comment'>-- Since 0.3.0</span>
<a name="line-557"></a><a name="MonadThrow"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>where</span>
<a name="line-558"></a>    <span class='hs-varid'>monadThrow</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-559"></a>
<a name="line-560"></a><a name="instance%20MonadThrow%20IO"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-conid'>IO</span> <span class='hs-keyword'>where</span>
<a name="line-561"></a>    <span class='hs-varid'>monadThrow</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>throwIO</span>
<a name="line-562"></a>
<a name="line-563"></a><a name="instance%20MonadThrow%20Maybe"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-conid'>Maybe</span> <span class='hs-keyword'>where</span>
<a name="line-564"></a>    <span class='hs-varid'>monadThrow</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-565"></a><a name="instance%20MonadThrow%20(Either%20SomeException)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-conid'>SomeException</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-566"></a>    <span class='hs-varid'>monadThrow</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Left</span> <span class='hs-varop'>.</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>toException</span>
<a name="line-567"></a><a name="instance%20MonadThrow%20%5b%5d"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-conid'>[]</span> <span class='hs-keyword'>where</span>
<a name="line-568"></a>    <span class='hs-varid'>monadThrow</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-569"></a>
<a name="line-570"></a><span class='hs-cpp'>#define GO(T) instance (MonadThrow m) =&gt; MonadThrow (T m) where monadThrow = lift . monadThrow</span>
<a name="line-571"></a><span class='hs-cpp'>#define GOX(X, T) instance (X, MonadThrow m) =&gt; MonadThrow (T m) where monadThrow = lift . monadThrow</span>
<a name="line-572"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span><span class='hs-layout'>)</span>
<a name="line-573"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>ListT</span><span class='hs-layout'>)</span>
<a name="line-574"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>MaybeT</span><span class='hs-layout'>)</span>
<a name="line-575"></a><span class='hs-conid'>GOX</span><span class='hs-layout'>(</span><span class='hs-conid'>Error</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-conid'>ErrorT</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-576"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-577"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>ContT</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-578"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span><span class='hs-layout'>)</span>
<a name="line-579"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-580"></a><span class='hs-conid'>GOX</span><span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span>
<a name="line-581"></a><span class='hs-conid'>GOX</span><span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-582"></a><span class='hs-conid'>GOX</span><span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-583"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-584"></a><span class='hs-conid'>GOX</span><span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span>
<a name="line-585"></a><span class='hs-cpp'>#undef GO</span>
<a name="line-586"></a><span class='hs-cpp'>#undef GOX</span>
<a name="line-587"></a>
<a name="line-588"></a><a name="resourceForkIO"></a><span class='hs-comment'>-- | Introduce a reference-counting scheme to allow a resource context to be</span>
<a name="line-589"></a><span class='hs-comment'>-- shared by multiple threads. Once the last thread exits, all remaining</span>
<a name="line-590"></a><span class='hs-comment'>-- resources will be released.</span>
<a name="line-591"></a><span class='hs-comment'>--</span>
<a name="line-592"></a><span class='hs-comment'>-- Note that abuse of this function will greatly delay the deallocation of</span>
<a name="line-593"></a><span class='hs-comment'>-- registered resources. This function should be used with care. A general</span>
<a name="line-594"></a><span class='hs-comment'>-- guideline:</span>
<a name="line-595"></a><span class='hs-comment'>--</span>
<a name="line-596"></a><span class='hs-comment'>-- If you are allocating a resource that should be shared by multiple threads,</span>
<a name="line-597"></a><span class='hs-comment'>-- and will be held for a long time, you should allocate it at the beginning of</span>
<a name="line-598"></a><span class='hs-comment'>-- a new @ResourceT@ block and then call @resourceForkIO@ from there.</span>
<a name="line-599"></a><span class='hs-comment'>--</span>
<a name="line-600"></a><span class='hs-comment'>-- Since 0.3.0</span>
<a name="line-601"></a><span class='hs-definition'>resourceForkIO</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadBaseControl</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-conid'>ThreadId</span>
<a name="line-602"></a><span class='hs-definition'>resourceForkIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-varid'>mask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>restore</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-603"></a>    <span class='hs-comment'>-- We need to make sure the counter is incremented before this call</span>
<a name="line-604"></a>    <span class='hs-comment'>-- returns. Otherwise, the parent thread may call runResourceT before</span>
<a name="line-605"></a>    <span class='hs-comment'>-- the child thread increments, and all resources will be freed</span>
<a name="line-606"></a>    <span class='hs-comment'>-- before the child gets called.</span>
<a name="line-607"></a>    <span class='hs-varid'>bracket_</span>
<a name="line-608"></a>        <span class='hs-layout'>(</span><span class='hs-varid'>stateAlloc</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-609"></a>        <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-610"></a>        <span class='hs-layout'>(</span><span class='hs-varid'>liftBaseDiscard</span> <span class='hs-varid'>forkIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>bracket_</span>
<a name="line-611"></a>            <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-612"></a>            <span class='hs-layout'>(</span><span class='hs-varid'>stateCleanup</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-613"></a>            <span class='hs-layout'>(</span><span class='hs-varid'>restore</span> <span class='hs-varop'>$</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-614"></a>
<a name="line-615"></a><a name="MonadUnsafeIO"></a><span class='hs-comment'>-- | A @Monad@ based on some monad which allows running of some 'IO' actions,</span>
<a name="line-616"></a><a name="MonadUnsafeIO"></a><span class='hs-comment'>-- via unsafe calls. This applies to 'IO' and 'ST', for instance.</span>
<a name="line-617"></a><a name="MonadUnsafeIO"></a><span class='hs-comment'>--</span>
<a name="line-618"></a><a name="MonadUnsafeIO"></a><span class='hs-comment'>-- Since 0.3.0</span>
<a name="line-619"></a><a name="MonadUnsafeIO"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadUnsafeIO</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>where</span>
<a name="line-620"></a>    <span class='hs-varid'>unsafeLiftIO</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-621"></a>
<a name="line-622"></a><a name="instance%20MonadUnsafeIO%20IO"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadUnsafeIO</span> <span class='hs-conid'>IO</span> <span class='hs-keyword'>where</span>
<a name="line-623"></a>    <span class='hs-varid'>unsafeLiftIO</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>id</span>
<a name="line-624"></a>
<a name="line-625"></a><a name="instance%20MonadUnsafeIO%20(ST%20s)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadUnsafeIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>ST</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-626"></a>    <span class='hs-varid'>unsafeLiftIO</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafeIOToST</span>
<a name="line-627"></a>
<a name="line-628"></a><a name="instance%20MonadUnsafeIO%20(Lazy.ST%20s)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadUnsafeIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>ST</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-629"></a>    <span class='hs-varid'>unsafeLiftIO</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LazyUnsafe</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeIOToST</span>
<a name="line-630"></a>
<a name="line-631"></a><a name="instance%20MonadUnsafeIO%20(t%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadTrans</span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadUnsafeIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadUnsafeIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-632"></a>    <span class='hs-varid'>unsafeLiftIO</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unsafeLiftIO</span>
<a name="line-633"></a>
<a name="line-634"></a><a name="MonadActive"></a><span class='hs-comment'>-- | Determine if some monad is still active. This is intended to prevent usage</span>
<a name="line-635"></a><a name="MonadActive"></a><span class='hs-comment'>-- of a monadic state after it has been closed.  This is necessary for such</span>
<a name="line-636"></a><a name="MonadActive"></a><span class='hs-comment'>-- cases as lazy I\/O, where an unevaluated thunk may still refer to a</span>
<a name="line-637"></a><a name="MonadActive"></a><span class='hs-comment'>-- closed @ResourceT@.</span>
<a name="line-638"></a><a name="MonadActive"></a><span class='hs-comment'>--</span>
<a name="line-639"></a><a name="MonadActive"></a><span class='hs-comment'>-- Since 0.3.0</span>
<a name="line-640"></a><a name="MonadActive"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadActive</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>where</span>
<a name="line-641"></a>    <span class='hs-varid'>monadActive</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>m</span> <span class='hs-conid'>Bool</span>
<a name="line-642"></a>
<a name="line-643"></a><a name="instance%20MonadActive%20(ResourceT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadActive</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadActive</span> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-644"></a>    <span class='hs-varid'>monadActive</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>rmMap</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>do</span>
<a name="line-645"></a>        <span class='hs-varid'>rm</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>readIORef</span> <span class='hs-varid'>rmMap</span>
<a name="line-646"></a>        <span class='hs-keyword'>case</span> <span class='hs-varid'>rm</span> <span class='hs-keyword'>of</span>
<a name="line-647"></a>            <span class='hs-conid'>ReleaseMapClosed</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span>
<a name="line-648"></a>            <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>monadActive</span> <span class='hs-comment'>-- recurse</span>
<a name="line-649"></a>
<a name="line-650"></a><a name="instance%20MonadActive%20Identity"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadActive</span> <span class='hs-conid'>Identity</span> <span class='hs-keyword'>where</span>
<a name="line-651"></a>    <span class='hs-varid'>monadActive</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span>
<a name="line-652"></a>
<a name="line-653"></a><a name="instance%20MonadActive%20IO"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadActive</span> <span class='hs-conid'>IO</span> <span class='hs-keyword'>where</span>
<a name="line-654"></a>    <span class='hs-varid'>monadActive</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span>
<a name="line-655"></a>
<a name="line-656"></a><a name="instance%20MonadActive%20(ST%20s)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadActive</span> <span class='hs-layout'>(</span><span class='hs-conid'>ST</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-657"></a>    <span class='hs-varid'>monadActive</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span>
<a name="line-658"></a>
<a name="line-659"></a><a name="instance%20MonadActive%20(Lazy.ST%20s)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadActive</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>ST</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-660"></a>    <span class='hs-varid'>monadActive</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span>
<a name="line-661"></a>
<a name="line-662"></a><span class='hs-cpp'>#define GO(T) instance MonadActive m =&gt; MonadActive (T m) where monadActive = lift monadActive</span>
<a name="line-663"></a><span class='hs-cpp'>#define GOX(X, T) instance (X, MonadActive m) =&gt; MonadActive (T m) where monadActive = lift monadActive</span>
<a name="line-664"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span><span class='hs-layout'>)</span>
<a name="line-665"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>ListT</span><span class='hs-layout'>)</span>
<a name="line-666"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>MaybeT</span><span class='hs-layout'>)</span>
<a name="line-667"></a><span class='hs-conid'>GOX</span><span class='hs-layout'>(</span><span class='hs-conid'>Error</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-conid'>ErrorT</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-668"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-669"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-670"></a><span class='hs-conid'>GOX</span><span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span>
<a name="line-671"></a><span class='hs-conid'>GOX</span><span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-672"></a><span class='hs-conid'>GOX</span><span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-673"></a><span class='hs-conid'>GO</span><span class='hs-layout'>(</span><span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-674"></a><span class='hs-conid'>GOX</span><span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span>
<a name="line-675"></a><span class='hs-cpp'>#undef GO</span>
<a name="line-676"></a><span class='hs-cpp'>#undef GOX</span>
<a name="line-677"></a>
<a name="line-678"></a><span class='hs-comment'>-- | A @Monad@ which can be used as a base for a @ResourceT@.</span>
<a name="line-679"></a><span class='hs-comment'>--</span>
<a name="line-680"></a><span class='hs-comment'>-- A @ResourceT@ has some restrictions on its base monad:</span>
<a name="line-681"></a><span class='hs-comment'>--</span>
<a name="line-682"></a><span class='hs-comment'>-- * @runResourceT@ requires an instance of @MonadBaseControl IO@.</span>
<a name="line-683"></a><span class='hs-comment'>-- * @MonadResource@ requires an instance of @MonadThrow@, @MonadUnsafeIO@, @MonadIO@, and @Applicative@.</span>
<a name="line-684"></a><span class='hs-comment'>--</span>
<a name="line-685"></a><span class='hs-comment'>-- While any instance of @MonadBaseControl IO@ should be an instance of the</span>
<a name="line-686"></a><span class='hs-comment'>-- other classes, this is not guaranteed by the type system (e.g., you may have</span>
<a name="line-687"></a><span class='hs-comment'>-- a transformer in your stack with does not implement @MonadThrow@). Ideally,</span>
<a name="line-688"></a><span class='hs-comment'>-- we would like to simply create an alias for the five type classes listed,</span>
<a name="line-689"></a><span class='hs-comment'>-- but this is not possible with GHC currently.</span>
<a name="line-690"></a><span class='hs-comment'>--</span>
<a name="line-691"></a><span class='hs-comment'>-- Instead, this typeclass acts as a proxy for the other five. Its only purpose</span>
<a name="line-692"></a><span class='hs-comment'>-- is to make your type signatures shorter.</span>
<a name="line-693"></a><span class='hs-comment'>--</span>
<a name="line-694"></a><span class='hs-comment'>-- Note that earlier versions of @conduit@ had a typeclass @ResourceIO@. This</span>
<a name="line-695"></a><span class='hs-comment'>-- fulfills much the same role.</span>
<a name="line-696"></a><span class='hs-comment'>--</span>
<a name="line-697"></a><span class='hs-comment'>-- Since 0.3.2</span>
<a name="line-698"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ &gt;= 704</span>
<a name="line-699"></a><a name="MonadResourceBase"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>MonadResourceBase</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadBaseControl</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadUnsafeIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Applicative</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-700"></a><span class='hs-cpp'>#else</span>
<a name="line-701"></a><a name="MonadResourceBase"></a><span class='hs-keyword'>class</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadBaseControl</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadUnsafeIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Applicative</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadResourceBase</span> <span class='hs-varid'>m</span>
<a name="line-702"></a><a name="instance%20MonadResourceBase%20m%20%23endif%20--%20$internalState%20--%20--%20A%20@ResourceT@%20internally%20is%20a%20modified%20@ReaderT@%20monad%20transformer%20holding%20--%20onto%20a%20mutable%20reference%20to%20all%20of%20the%20release%20actions%20still%20remaining%20to%20be%20--%20performed.%20If%20you%20are%20building%20up%20a%20custom%20application%20monad,%20it%20may%20be%20more%20--%20efficient%20to%20embed%20this%20@ReaderT@%20functionality%20directly%20in%20your%20own%20monad%20--%20instead%20of%20wrapping%20around%20@ResourceT@%20itself.%20This%20section%20provides%20you%20the%20--%20means%20of%20doing%20so.%20--%20%7c%20Get%20the%20internal%20state%20of%20the%20current%20@ResourceT@.%20--%20--%20Since%200.4.6%20getInternalState%20::%20Monad%20m%20=%3e%20ResourceT%20m%20InternalState%20getInternalState%20=%20ResourceT%20return%20--%20%7c%20The%20internal%20state%20held%20by%20a%20@ResourceT@%20transformer.%20--%20--%20Since%200.4.6%20type%20InternalState%20=%20I.IORef%20ReleaseMap%20--%20%7c%20Unwrap%20a%20@ResourceT@%20using%20the%20given%20@InternalState@.%20--%20--%20Since%200.4.6%20runInternalState%20::%20ResourceT%20m%20a%20-%3e%20InternalState%20-%3e%20m%20a%20runInternalState%20=%20unResourceT%20--%20%7c%20Run%20an%20action%20in%20the%20underlying%20monad,%20providing%20it%20the%20@InternalState.%20--%20--%20Since%200.4.6%20withInternalState%20::%20(InternalState%20-%3e%20m%20a)%20-%3e%20ResourceT%20m%20a%20withInternalState%20=%20ResourceT"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadBaseControl</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadUnsafeIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Applicative</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadResourceBase</span> <span class='hs-varid'>m</span>
<a name="line-703"></a><span class='hs-cpp'>#endif</span>
<a name="line-704"></a>
<a name="line-705"></a><span class='hs-comment'>-- $internalState</span>
<a name="line-706"></a><span class='hs-comment'>--</span>
<a name="line-707"></a><span class='hs-comment'>-- A @ResourceT@ internally is a modified @ReaderT@ monad transformer holding</span>
<a name="line-708"></a><span class='hs-comment'>-- onto a mutable reference to all of the release actions still remaining to be</span>
<a name="line-709"></a><span class='hs-comment'>-- performed. If you are building up a custom application monad, it may be more</span>
<a name="line-710"></a><span class='hs-comment'>-- efficient to embed this @ReaderT@ functionality directly in your own monad</span>
<a name="line-711"></a><span class='hs-comment'>-- instead of wrapping around @ResourceT@ itself. This section provides you the</span>
<a name="line-712"></a><span class='hs-comment'>-- means of doing so.</span>
<a name="line-713"></a>
<a name="line-714"></a><a name="getInternalState"></a><span class='hs-comment'>-- | Get the internal state of the current @ResourceT@.</span>
<a name="line-715"></a><span class='hs-comment'>--</span>
<a name="line-716"></a><span class='hs-comment'>-- Since 0.4.6</span>
<a name="line-717"></a><span class='hs-definition'>getInternalState</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-conid'>InternalState</span>
<a name="line-718"></a><span class='hs-definition'>getInternalState</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>return</span>
<a name="line-719"></a>
<a name="line-720"></a><a name="InternalState"></a><span class='hs-comment'>-- | The internal state held by a @ResourceT@ transformer.</span>
<a name="line-721"></a><a name="InternalState"></a><span class='hs-comment'>--</span>
<a name="line-722"></a><a name="InternalState"></a><span class='hs-comment'>-- Since 0.4.6</span>
<a name="line-723"></a><a name="InternalState"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>InternalState</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span> <span class='hs-conid'>ReleaseMap</span>
<a name="line-724"></a>
<a name="line-725"></a><a name="runInternalState"></a><span class='hs-comment'>-- | Unwrap a @ResourceT@ using the given @InternalState@.</span>
<a name="line-726"></a><span class='hs-comment'>--</span>
<a name="line-727"></a><span class='hs-comment'>-- Since 0.4.6</span>
<a name="line-728"></a><span class='hs-definition'>runInternalState</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>InternalState</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-729"></a><span class='hs-definition'>runInternalState</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unResourceT</span>
<a name="line-730"></a>
<a name="line-731"></a><a name="withInternalState"></a><span class='hs-comment'>-- | Run an action in the underlying monad, providing it the @InternalState.</span>
<a name="line-732"></a><span class='hs-comment'>--</span>
<a name="line-733"></a><span class='hs-comment'>-- Since 0.4.6</span>
<a name="line-734"></a><span class='hs-definition'>withInternalState</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>InternalState</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-735"></a><span class='hs-definition'>withInternalState</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ResourceT</span>
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