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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/Control.hs</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP
<a name="line-2"></a>           , NoImplicitPrelude
<a name="line-3"></a>           , RankNTypes
<a name="line-4"></a>           , TypeFamilies
<a name="line-5"></a>           , FunctionalDependencies
<a name="line-6"></a>           , FlexibleInstances
<a name="line-7"></a>           , UndecidableInstances
<a name="line-8"></a>           , MultiParamTypeClasses #-}</span>
<a name="line-9"></a>
<a name="line-10"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ &gt;= 702</span>
<a name="line-11"></a><span class='hs-comment'>{-# LANGUAGE Safe #-}</span>
<a name="line-12"></a><span class='hs-cpp'>#endif</span>
<a name="line-13"></a>
<a name="line-14"></a><span class='hs-cpp'>#if MIN_VERSION_transformers(0,4,0)</span>
<a name="line-15"></a><span class='hs-comment'>-- Hide warnings for the deprecated ErrorT transformer:</span>
<a name="line-16"></a><span class='hs-comment'>{-# OPTIONS_GHC -fno-warn-warnings-deprecations #-}</span>
<a name="line-17"></a><span class='hs-cpp'>#endif</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-comment'>{- |
<a name="line-20"></a>Module      :  Control.Monad.Trans.Control
<a name="line-21"></a>Copyright   :  Bas van Dijk, Anders Kaseorg
<a name="line-22"></a>License     :  BSD-style
<a name="line-23"></a>
<a name="line-24"></a>Maintainer  :  Bas van Dijk &lt;v.dijk.bas@gmail.com&gt;
<a name="line-25"></a>Stability   :  experimental
<a name="line-26"></a>-}</span>
<a name="line-27"></a>
<a name="line-28"></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'>Control</span>
<a name="line-29"></a>    <span class='hs-layout'>(</span> <span class='hs-comment'>-- * MonadTransControl</span>
<a name="line-30"></a>      <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'>Run</span>
<a name="line-31"></a>
<a name="line-32"></a>      <span class='hs-comment'>-- ** Defaults</span>
<a name="line-33"></a>      <span class='hs-comment'>-- $MonadTransControlDefaults</span>
<a name="line-34"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>RunDefault</span><span class='hs-layout'>,</span> <span class='hs-varid'>defaultLiftWith</span><span class='hs-layout'>,</span> <span class='hs-varid'>defaultRestoreT</span>
<a name="line-35"></a>
<a name="line-36"></a>      <span class='hs-comment'>-- * MonadBaseControl</span>
<a name="line-37"></a>    <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><span class='hs-layout'>,</span> <span class='hs-conid'>RunInBase</span>
<a name="line-38"></a>
<a name="line-39"></a>      <span class='hs-comment'>-- ** Defaults</span>
<a name="line-40"></a>      <span class='hs-comment'>-- $MonadBaseControlDefaults</span>
<a name="line-41"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>ComposeSt</span><span class='hs-layout'>,</span> <span class='hs-conid'>RunInBaseDefault</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-42"></a>
<a name="line-43"></a>      <span class='hs-comment'>-- * Utility functions</span>
<a name="line-44"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>control</span><span class='hs-layout'>,</span> <span class='hs-varid'>embed</span><span class='hs-layout'>,</span> <span class='hs-varid'>embed_</span><span class='hs-layout'>,</span> <span class='hs-varid'>captureT</span><span class='hs-layout'>,</span> <span class='hs-varid'>captureM</span>
<a name="line-45"></a>
<a name="line-46"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>liftBaseOp</span><span class='hs-layout'>,</span> <span class='hs-varid'>liftBaseOp_</span>
<a name="line-47"></a>
<a name="line-48"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>liftBaseDiscard</span><span class='hs-layout'>,</span> <span class='hs-varid'>liftBaseOpDiscard</span>
<a name="line-49"></a>
<a name="line-50"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>liftThrough</span>
<a name="line-51"></a>    <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-52"></a>
<a name="line-53"></a>
<a name="line-54"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-55"></a><span class='hs-comment'>-- Imports</span>
<a name="line-56"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-57"></a>
<a name="line-58"></a><span class='hs-comment'>-- from base:</span>
<a name="line-59"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Function</span> <span class='hs-layout'>(</span> <span class='hs-layout'>(</span><span class='hs-varop'>.</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>$</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>const</span> <span class='hs-layout'>)</span>
<a name="line-60"></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> <span class='hs-varid'>mempty</span> <span class='hs-layout'>)</span>
<a name="line-61"></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-conid'>Monad</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>&gt;&gt;=</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>return</span><span class='hs-layout'>,</span> <span class='hs-varid'>liftM</span> <span class='hs-layout'>)</span>
<a name="line-62"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span>     <span class='hs-layout'>(</span> <span class='hs-conid'>IO</span> <span class='hs-layout'>)</span>
<a name="line-63"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span>    <span class='hs-layout'>(</span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>)</span>
<a name="line-64"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Either</span>   <span class='hs-layout'>(</span> <span class='hs-conid'>Either</span> <span class='hs-layout'>)</span>
<a name="line-65"></a>
<a name="line-66"></a><span class='hs-cpp'>#if MIN_VERSION_base(4,4,0)</span>
<a name="line-67"></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'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>Safe</span>           <span class='hs-layout'>(</span> <span class='hs-conid'>ST</span> <span class='hs-layout'>)</span>
<a name="line-68"></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'>Safe</span>      <span class='hs-keyword'>as</span> <span class='hs-conid'>Strict</span> <span class='hs-layout'>(</span> <span class='hs-conid'>ST</span> <span class='hs-layout'>)</span>
<a name="line-69"></a><span class='hs-cpp'>#endif</span>
<a name="line-70"></a>
<a name="line-71"></a><span class='hs-comment'>-- from stm:</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'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>STM</span> <span class='hs-layout'>(</span> <span class='hs-conid'>STM</span> <span class='hs-layout'>)</span>
<a name="line-73"></a>
<a name="line-74"></a><span class='hs-comment'>-- from transformers:</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-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>
<a name="line-76"></a>
<a name="line-77"></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><span class='hs-conid'>IdentityT</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>runIdentityT</span> <span class='hs-layout'>)</span>
<a name="line-78"></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><span class='hs-conid'>ListT</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>     <span class='hs-varid'>runListT</span> <span class='hs-layout'>)</span>
<a name="line-79"></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><span class='hs-conid'>MaybeT</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>    <span class='hs-varid'>runMaybeT</span> <span class='hs-layout'>)</span>
<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'>Error</span>    <span class='hs-layout'>(</span> <span class='hs-conid'>ErrorT</span>   <span class='hs-layout'>(</span><span class='hs-conid'>ErrorT</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>    <span class='hs-varid'>runErrorT</span><span class='hs-layout'>,</span> <span class='hs-conid'>Error</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'>Reader</span>   <span class='hs-layout'>(</span> <span class='hs-conid'>ReaderT</span>  <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>   <span class='hs-varid'>runReaderT</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'>State</span>    <span class='hs-layout'>(</span> <span class='hs-conid'>StateT</span>   <span class='hs-layout'>(</span><span class='hs-conid'>StateT</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>    <span class='hs-varid'>runStateT</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'>Writer</span>   <span class='hs-layout'>(</span> <span class='hs-conid'>WriterT</span>  <span class='hs-layout'>(</span><span class='hs-conid'>WriterT</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>   <span class='hs-varid'>runWriterT</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'>RWS</span>      <span class='hs-layout'>(</span> <span class='hs-conid'>RWST</span>     <span class='hs-layout'>(</span><span class='hs-conid'>RWST</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>      <span class='hs-varid'>runRWST</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'>Except</span>   <span class='hs-layout'>(</span> <span class='hs-conid'>ExceptT</span>  <span class='hs-layout'>(</span><span class='hs-conid'>ExceptT</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>   <span class='hs-varid'>runExceptT</span> <span class='hs-layout'>)</span>
<a name="line-86"></a>
<a name="line-87"></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><span class='hs-conid'>RWST</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>    <span class='hs-varid'>runRWST</span> <span class='hs-layout'>)</span>
<a name="line-88"></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><span class='hs-conid'>StateT</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>  <span class='hs-varid'>runStateT</span> <span class='hs-layout'>)</span>
<a name="line-89"></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><span class='hs-conid'>WriterT</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>runWriterT</span> <span class='hs-layout'>)</span>
<a name="line-90"></a>
<a name="line-91"></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>
<a name="line-92"></a>
<a name="line-93"></a><span class='hs-comment'>-- from transformers-base:</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'>Base</span> <span class='hs-layout'>(</span> <span class='hs-conid'>MonadBase</span> <span class='hs-layout'>)</span>
<a name="line-95"></a>
<a name="line-96"></a><span class='hs-cpp'>#if MIN_VERSION_base(4,3,0)</span>
<a name="line-97"></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'>void</span> <span class='hs-layout'>)</span>
<a name="line-98"></a><span class='hs-cpp'>#else</span>
<a name="line-99"></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-layout'>(</span><span class='hs-conid'>Functor</span><span class='hs-layout'>,</span> <span class='hs-varid'>fmap</span><span class='hs-layout'>)</span>
<a name="line-100"></a><a name="void"></a><span class='hs-definition'>void</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Functor</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>f</span> <span class='hs-conid'>()</span>
<a name="line-101"></a><span class='hs-definition'>void</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-102"></a><span class='hs-cpp'>#endif</span>
<a name="line-103"></a>
<a name="line-104"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span> <span class='hs-layout'>(</span><span class='hs-varid'>id</span><span class='hs-layout'>)</span>
<a name="line-105"></a>
<a name="line-106"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-107"></a><span class='hs-comment'>-- MonadTransControl type class</span>
<a name="line-108"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-109"></a>
<a name="line-110"></a><a name="MonadTransControl"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>MonadTrans</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadTransControl</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>where</span>
<a name="line-111"></a>  <span class='hs-comment'>-- | Monadic state of @t@.</span>
<a name="line-112"></a>  <span class='hs-keyword'>type</span> <span class='hs-conid'>StT</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>*</span>
<a name="line-113"></a>
<a name="line-114"></a>  <span class='hs-comment'>-- | @liftWith@ is similar to 'lift' in that it lifts a computation from</span>
<a name="line-115"></a>  <span class='hs-comment'>-- the argument monad to the constructed monad.</span>
<a name="line-116"></a>  <span class='hs-comment'>--</span>
<a name="line-117"></a>  <span class='hs-comment'>-- Instances should satisfy similar laws as the 'MonadTrans' laws:</span>
<a name="line-118"></a>  <span class='hs-comment'>--</span>
<a name="line-119"></a>  <span class='hs-comment'>-- @liftWith . const . return = return@</span>
<a name="line-120"></a>  <span class='hs-comment'>--</span>
<a name="line-121"></a>  <span class='hs-comment'>-- @liftWith (const (m &gt;&gt;= f)) = liftWith (const m) &gt;&gt;= liftWith . const . f@</span>
<a name="line-122"></a>  <span class='hs-comment'>--</span>
<a name="line-123"></a>  <span class='hs-comment'>-- The difference with 'lift' is that before lifting the @m@ computation</span>
<a name="line-124"></a>  <span class='hs-comment'>-- @liftWith@ captures the state of @t@. It then provides the @m@</span>
<a name="line-125"></a>  <span class='hs-comment'>-- computation with a 'Run' function that allows running @t n@ computations in</span>
<a name="line-126"></a>  <span class='hs-comment'>-- @n@ (for all @n@) on the captured state.</span>
<a name="line-127"></a>  <span class='hs-varid'>liftWith</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-layout'>(</span><span class='hs-conid'>Run</span> <span class='hs-varid'>t</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-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-128"></a>
<a name="line-129"></a>  <span class='hs-comment'>-- | Construct a @t@ computation from the monadic state of @t@ that is</span>
<a name="line-130"></a>  <span class='hs-comment'>-- returned from a 'Run' function.</span>
<a name="line-131"></a>  <span class='hs-comment'>--</span>
<a name="line-132"></a>  <span class='hs-comment'>-- Instances should satisfy:</span>
<a name="line-133"></a>  <span class='hs-comment'>--</span>
<a name="line-134"></a>  <span class='hs-comment'>-- @liftWith (\\run -&gt; run t) &gt;&gt;= restoreT . return = t@</span>
<a name="line-135"></a>  <span class='hs-varid'>restoreT</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-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>StT</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-136"></a>
<a name="line-137"></a><a name="Run"></a><span class='hs-comment'>-- | A function that runs a transformed monad @t n@ on the monadic state that</span>
<a name="line-138"></a><a name="Run"></a><span class='hs-comment'>-- was captured by 'liftWith'</span>
<a name="line-139"></a><a name="Run"></a><span class='hs-comment'>--</span>
<a name="line-140"></a><a name="Run"></a><span class='hs-comment'>-- A @Run t@ function yields a computation in @n@ that returns the monadic state</span>
<a name="line-141"></a><a name="Run"></a><span class='hs-comment'>-- of @t@. This state can later be used to restore a @t@ computation using</span>
<a name="line-142"></a><a name="Run"></a><span class='hs-comment'>-- 'restoreT'.</span>
<a name="line-143"></a><a name="Run"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Run</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>n</span> <span class='hs-varid'>b</span><span class='hs-varop'>.</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>t</span> <span class='hs-varid'>n</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-conid'>StT</span> <span class='hs-varid'>t</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-144"></a>
<a name="line-145"></a>
<a name="line-146"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-147"></a><span class='hs-comment'>-- Defaults for MonadTransControl</span>
<a name="line-148"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-149"></a>
<a name="line-150"></a><span class='hs-comment'>-- $MonadTransControlDefaults</span>
<a name="line-151"></a><span class='hs-comment'>--</span>
<a name="line-152"></a><span class='hs-comment'>-- The following functions can be used to define a 'MonadTransControl' instance</span>
<a name="line-153"></a><span class='hs-comment'>-- for a monad transformer which simply wraps another monad transformer which</span>
<a name="line-154"></a><span class='hs-comment'>-- already has a @MonadTransControl@ instance. For example:</span>
<a name="line-155"></a><span class='hs-comment'>--</span>
<a name="line-156"></a><span class='hs-comment'>-- @</span>
<a name="line-157"></a><span class='hs-comment'>-- {-\# LANGUAGE GeneralizedNewtypeDeriving \#-}</span>
<a name="line-158"></a><span class='hs-comment'>--</span>
<a name="line-159"></a><span class='hs-comment'>-- newtype CounterT m a = CounterT {unCounterT :: StateT Int m a}</span>
<a name="line-160"></a><span class='hs-comment'>--   deriving (Monad, MonadTrans)</span>
<a name="line-161"></a><span class='hs-comment'>--</span>
<a name="line-162"></a><span class='hs-comment'>-- instance MonadTransControl CounterT where</span>
<a name="line-163"></a><span class='hs-comment'>--     type StT CounterT a = StT (StateT Int) a</span>
<a name="line-164"></a><span class='hs-comment'>--     liftWith = 'defaultLiftWith' CounterT unCounterT</span>
<a name="line-165"></a><span class='hs-comment'>--     restoreT = 'defaultRestoreT' CounterT</span>
<a name="line-166"></a><span class='hs-comment'>-- @</span>
<a name="line-167"></a>
<a name="line-168"></a><a name="RunDefault"></a><span class='hs-comment'>-- | A function like 'Run' that runs a monad transformer @t@ which wraps the</span>
<a name="line-169"></a><a name="RunDefault"></a><span class='hs-comment'>-- monad transformer @t'@. This is used in 'defaultLiftWith'.</span>
<a name="line-170"></a><a name="RunDefault"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>RunDefault</span> <span class='hs-varid'>t</span> <span class='hs-varid'>t'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>n</span> <span class='hs-varid'>b</span><span class='hs-varop'>.</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>t</span> <span class='hs-varid'>n</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-conid'>StT</span> <span class='hs-varid'>t'</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-171"></a>
<a name="line-172"></a><a name="defaultLiftWith"></a><span class='hs-comment'>-- | Default definition for the 'liftWith' method.</span>
<a name="line-173"></a><span class='hs-definition'>defaultLiftWith</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadTransControl</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-174"></a>                <span class='hs-keyglyph'>=&gt;</span> <span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>b</span><span class='hs-varop'>.</span>   <span class='hs-varid'>n</span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>     <span class='hs-comment'>-- ^ Monad constructor</span>
<a name="line-175"></a>                <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>o</span> <span class='hs-varid'>b</span><span class='hs-varop'>.</span> <span class='hs-varid'>t</span> <span class='hs-varid'>o</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>n</span> <span class='hs-varid'>o</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>     <span class='hs-comment'>-- ^ Monad deconstructor</span>
<a name="line-176"></a>                <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>RunDefault</span> <span class='hs-varid'>t</span> <span class='hs-varid'>n</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-177"></a>                <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-178"></a><span class='hs-definition'>defaultLiftWith</span> <span class='hs-varid'>t</span> <span class='hs-varid'>unT</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>f</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>t</span> <span class='hs-varop'>$</span> <span class='hs-varid'>liftWith</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>run</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-varid'>run</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unT</span>
<a name="line-179"></a><span class='hs-comment'>{-# INLINABLE defaultLiftWith #-}</span>
<a name="line-180"></a>
<a name="line-181"></a><a name="defaultRestoreT"></a><span class='hs-comment'>-- | Default definition for the 'restoreT' method.</span>
<a name="line-182"></a><span class='hs-definition'>defaultRestoreT</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadTransControl</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-183"></a>                <span class='hs-keyglyph'>=&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>     <span class='hs-comment'>-- ^ Monad constructor</span>
<a name="line-184"></a>                <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>StT</span> <span class='hs-varid'>n</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-185"></a>                <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-186"></a><span class='hs-definition'>defaultRestoreT</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>t</span> <span class='hs-varop'>.</span> <span class='hs-varid'>restoreT</span>
<a name="line-187"></a><span class='hs-comment'>{-# INLINABLE defaultRestoreT #-}</span>
<a name="line-188"></a>
<a name="line-189"></a>
<a name="line-190"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-191"></a><span class='hs-comment'>-- MonadTransControl instances</span>
<a name="line-192"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-193"></a>
<a name="line-194"></a><a name="instance%20MonadTransControl%20IdentityT"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadTransControl</span> <span class='hs-conid'>IdentityT</span> <span class='hs-keyword'>where</span>
<a name="line-195"></a>    <span class='hs-keyword'>type</span> <span class='hs-conid'>StT</span> <span class='hs-conid'>IdentityT</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-196"></a>    <span class='hs-varid'>liftWith</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IdentityT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runIdentityT</span>
<a name="line-197"></a>    <span class='hs-varid'>restoreT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IdentityT</span>
<a name="line-198"></a>    <span class='hs-comment'>{-# INLINABLE liftWith #-}</span>
<a name="line-199"></a>    <span class='hs-comment'>{-# INLINABLE restoreT #-}</span>
<a name="line-200"></a>
<a name="line-201"></a><a name="instance%20MonadTransControl%20MaybeT"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadTransControl</span> <span class='hs-conid'>MaybeT</span> <span class='hs-keyword'>where</span>
<a name="line-202"></a>    <span class='hs-keyword'>type</span> <span class='hs-conid'>StT</span> <span class='hs-conid'>MaybeT</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span>
<a name="line-203"></a>    <span class='hs-varid'>liftWith</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>MaybeT</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'>$</span> <span class='hs-varid'>runMaybeT</span>
<a name="line-204"></a>    <span class='hs-varid'>restoreT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>MaybeT</span>
<a name="line-205"></a>    <span class='hs-comment'>{-# INLINABLE liftWith #-}</span>
<a name="line-206"></a>    <span class='hs-comment'>{-# INLINABLE restoreT #-}</span>
<a name="line-207"></a>
<a name="line-208"></a><a name="instance%20MonadTransControl%20(ErrorT%20e)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Error</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadTransControl</span> <span class='hs-layout'>(</span><span class='hs-conid'>ErrorT</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-209"></a>    <span class='hs-keyword'>type</span> <span class='hs-conid'>StT</span> <span class='hs-layout'>(</span><span class='hs-conid'>ErrorT</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Either</span> <span class='hs-varid'>e</span> <span class='hs-varid'>a</span>
<a name="line-210"></a>    <span class='hs-varid'>liftWith</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ErrorT</span> <span class='hs-varop'>$</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'>runErrorT</span>
<a name="line-211"></a>    <span class='hs-varid'>restoreT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ErrorT</span>
<a name="line-212"></a>    <span class='hs-comment'>{-# INLINABLE liftWith #-}</span>
<a name="line-213"></a>    <span class='hs-comment'>{-# INLINABLE restoreT #-}</span>
<a name="line-214"></a>
<a name="line-215"></a><a name="instance%20MonadTransControl%20(ExceptT%20e)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadTransControl</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptT</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-216"></a>    <span class='hs-keyword'>type</span> <span class='hs-conid'>StT</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptT</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Either</span> <span class='hs-varid'>e</span> <span class='hs-varid'>a</span>
<a name="line-217"></a>    <span class='hs-varid'>liftWith</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptT</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'>$</span> <span class='hs-varid'>runExceptT</span>
<a name="line-218"></a>    <span class='hs-varid'>restoreT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptT</span>
<a name="line-219"></a>    <span class='hs-comment'>{-# INLINABLE liftWith #-}</span>
<a name="line-220"></a>    <span class='hs-comment'>{-# INLINABLE restoreT #-}</span>
<a name="line-221"></a>
<a name="line-222"></a><a name="instance%20MonadTransControl%20ListT"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadTransControl</span> <span class='hs-conid'>ListT</span> <span class='hs-keyword'>where</span>
<a name="line-223"></a>    <span class='hs-keyword'>type</span> <span class='hs-conid'>StT</span> <span class='hs-conid'>ListT</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-224"></a>    <span class='hs-varid'>liftWith</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ListT</span> <span class='hs-varop'>$</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'>runListT</span>
<a name="line-225"></a>    <span class='hs-varid'>restoreT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ListT</span>
<a name="line-226"></a>    <span class='hs-comment'>{-# INLINABLE liftWith #-}</span>
<a name="line-227"></a>    <span class='hs-comment'>{-# INLINABLE restoreT #-}</span>
<a name="line-228"></a>
<a name="line-229"></a><a name="instance%20MonadTransControl%20(ReaderT%20r)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadTransControl</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-230"></a>    <span class='hs-keyword'>type</span> <span class='hs-conid'>StT</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-231"></a>    <span class='hs-varid'>liftWith</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ReaderT</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-varid'>t</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>runReaderT</span> <span class='hs-varid'>t</span> <span class='hs-varid'>r</span>
<a name="line-232"></a>    <span class='hs-varid'>restoreT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ReaderT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>const</span>
<a name="line-233"></a>    <span class='hs-comment'>{-# INLINABLE liftWith #-}</span>
<a name="line-234"></a>    <span class='hs-comment'>{-# INLINABLE restoreT #-}</span>
<a name="line-235"></a>
<a name="line-236"></a><a name="instance%20MonadTransControl%20(StateT%20s)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadTransControl</span> <span class='hs-layout'>(</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-237"></a>    <span class='hs-keyword'>type</span> <span class='hs-conid'>StT</span> <span class='hs-layout'>(</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-238"></a>    <span class='hs-varid'>liftWith</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StateT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-239"></a>                   <span class='hs-varid'>liftM</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-240"></a>                         <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>t</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>runStateT</span> <span class='hs-varid'>t</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-241"></a>    <span class='hs-varid'>restoreT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StateT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>const</span>
<a name="line-242"></a>    <span class='hs-comment'>{-# INLINABLE liftWith #-}</span>
<a name="line-243"></a>    <span class='hs-comment'>{-# INLINABLE restoreT #-}</span>
<a name="line-244"></a>
<a name="line-245"></a><a name="instance%20MonadTransControl%20(Strict.StateT%20s)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadTransControl</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> <span class='hs-keyword'>where</span>
<a name="line-246"></a>    <span class='hs-keyword'>type</span> <span class='hs-conid'>StT</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> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-247"></a>    <span class='hs-varid'>liftWith</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-248"></a>                   <span class='hs-varid'>liftM</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-249"></a>                         <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>t</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-varid'>runStateT</span> <span class='hs-varid'>t</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-250"></a>    <span class='hs-varid'>restoreT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>const</span>
<a name="line-251"></a>    <span class='hs-comment'>{-# INLINABLE liftWith #-}</span>
<a name="line-252"></a>    <span class='hs-comment'>{-# INLINABLE restoreT #-}</span>
<a name="line-253"></a>
<a name="line-254"></a><a name="instance%20MonadTransControl%20(WriterT%20w)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadTransControl</span> <span class='hs-layout'>(</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-255"></a>    <span class='hs-keyword'>type</span> <span class='hs-conid'>StT</span> <span class='hs-layout'>(</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <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>
<a name="line-256"></a>    <span class='hs-varid'>liftWith</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>WriterT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>liftM</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>mempty</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-257"></a>                                 <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runWriterT</span><span class='hs-layout'>)</span>
<a name="line-258"></a>    <span class='hs-varid'>restoreT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>WriterT</span>
<a name="line-259"></a>    <span class='hs-comment'>{-# INLINABLE liftWith #-}</span>
<a name="line-260"></a>    <span class='hs-comment'>{-# INLINABLE restoreT #-}</span>
<a name="line-261"></a>
<a name="line-262"></a><a name="instance%20MonadTransControl%20(Strict.WriterT%20w)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadTransControl</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> <span class='hs-keyword'>where</span>
<a name="line-263"></a>    <span class='hs-keyword'>type</span> <span class='hs-conid'>StT</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> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <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>
<a name="line-264"></a>    <span class='hs-varid'>liftWith</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>liftM</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>mempty</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-265"></a>                                        <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-varid'>runWriterT</span><span class='hs-layout'>)</span>
<a name="line-266"></a>    <span class='hs-varid'>restoreT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span>
<a name="line-267"></a>    <span class='hs-comment'>{-# INLINABLE liftWith #-}</span>
<a name="line-268"></a>    <span class='hs-comment'>{-# INLINABLE restoreT #-}</span>
<a name="line-269"></a>
<a name="line-270"></a><a name="instance%20MonadTransControl%20(RWST%20r%20w%20s)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadTransControl</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> <span class='hs-keyword'>where</span>
<a name="line-271"></a>    <span class='hs-keyword'>type</span> <span class='hs-conid'>StT</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> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span>
<a name="line-272"></a>    <span class='hs-varid'>liftWith</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RWST</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>liftM</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>mempty</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-273"></a>                                      <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>t</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>runRWST</span> <span class='hs-varid'>t</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-274"></a>    <span class='hs-varid'>restoreT</span> <span class='hs-varid'>mSt</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RWST</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>mSt</span>
<a name="line-275"></a>    <span class='hs-comment'>{-# INLINABLE liftWith #-}</span>
<a name="line-276"></a>    <span class='hs-comment'>{-# INLINABLE restoreT #-}</span>
<a name="line-277"></a>
<a name="line-278"></a><a name="instance%20MonadTransControl%20(Strict.RWST%20r%20w%20s)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>MonadTransControl</span> <span class='hs-layout'>(</span><span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-279"></a>    <span class='hs-keyword'>type</span> <span class='hs-conid'>StT</span> <span class='hs-layout'>(</span><span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span>
<a name="line-280"></a>    <span class='hs-varid'>liftWith</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span>
<a name="line-281"></a>        <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>liftM</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-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>mempty</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-282"></a>                                    <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>t</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-varid'>runRWST</span> <span class='hs-varid'>t</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-283"></a>    <span class='hs-varid'>restoreT</span> <span class='hs-varid'>mSt</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>mSt</span>
<a name="line-284"></a>    <span class='hs-comment'>{-# INLINABLE liftWith #-}</span>
<a name="line-285"></a>    <span class='hs-comment'>{-# INLINABLE restoreT #-}</span>
<a name="line-286"></a>
<a name="line-287"></a>
<a name="line-288"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-289"></a><span class='hs-comment'>-- MonadBaseControl type class</span>
<a name="line-290"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-291"></a>
<a name="line-292"></a><a name="MonadBaseControl"></a><span class='hs-keyword'>class</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'>MonadBaseControl</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>where</span>
<a name="line-293"></a>    <span class='hs-comment'>-- | Monadic state of @m@.</span>
<a name="line-294"></a>    <span class='hs-keyword'>type</span> <span class='hs-conid'>StM</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>*</span>
<a name="line-295"></a>
<a name="line-296"></a>    <span class='hs-comment'>-- | @liftBaseWith@ is similar to 'liftIO' and 'liftBase' in that it</span>
<a name="line-297"></a>    <span class='hs-comment'>-- lifts a base computation to the constructed monad.</span>
<a name="line-298"></a>    <span class='hs-comment'>--</span>
<a name="line-299"></a>    <span class='hs-comment'>-- Instances should satisfy similar laws as the 'MonadIO' and 'MonadBase' laws:</span>
<a name="line-300"></a>    <span class='hs-comment'>--</span>
<a name="line-301"></a>    <span class='hs-comment'>-- @liftBaseWith . const . return = return@</span>
<a name="line-302"></a>    <span class='hs-comment'>--</span>
<a name="line-303"></a>    <span class='hs-comment'>-- @liftBaseWith (const (m &gt;&gt;= f)) = liftBaseWith (const m) &gt;&gt;= liftBaseWith . const . f@</span>
<a name="line-304"></a>    <span class='hs-comment'>--</span>
<a name="line-305"></a>    <span class='hs-comment'>-- The difference with 'liftBase' is that before lifting the base computation</span>
<a name="line-306"></a>    <span class='hs-comment'>-- @liftBaseWith@ captures the state of @m@. It then provides the base</span>
<a name="line-307"></a>    <span class='hs-comment'>-- computation with a 'RunInBase' function that allows running @m@</span>
<a name="line-308"></a>    <span class='hs-comment'>-- computations in the base monad on the captured state.</span>
<a name="line-309"></a>    <span class='hs-varid'>liftBaseWith</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>RunInBase</span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-310"></a>
<a name="line-311"></a>    <span class='hs-comment'>-- | Construct a @m@ computation from the monadic state of @m@ that is</span>
<a name="line-312"></a>    <span class='hs-comment'>-- returned from a 'RunInBase' function.</span>
<a name="line-313"></a>    <span class='hs-comment'>--</span>
<a name="line-314"></a>    <span class='hs-comment'>-- Instances should satisfy:</span>
<a name="line-315"></a>    <span class='hs-comment'>--</span>
<a name="line-316"></a>    <span class='hs-comment'>-- @liftBaseWith (\\runInBase -&gt; runInBase m) &gt;&gt;= restoreM = m@</span>
<a name="line-317"></a>    <span class='hs-varid'>restoreM</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>StM</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-318"></a>
<a name="line-319"></a><a name="RunInBase"></a><span class='hs-comment'>-- | A function that runs a @m@ computation on the monadic state that was</span>
<a name="line-320"></a><a name="RunInBase"></a><span class='hs-comment'>-- captured by 'liftBaseWith'</span>
<a name="line-321"></a><a name="RunInBase"></a><span class='hs-comment'>--</span>
<a name="line-322"></a><a name="RunInBase"></a><span class='hs-comment'>-- A @RunInBase m@ function yields a computation in the base monad of @m@ that</span>
<a name="line-323"></a><a name="RunInBase"></a><span class='hs-comment'>-- returns the monadic state of @m@. This state can later be used to restore the</span>
<a name="line-324"></a><a name="RunInBase"></a><span class='hs-comment'>-- @m@ computation using 'restoreM'.</span>
<a name="line-325"></a><a name="RunInBase"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>RunInBase</span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>a</span><span class='hs-varop'>.</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>b</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-326"></a>
<a name="line-327"></a>
<a name="line-328"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-329"></a><span class='hs-comment'>-- MonadBaseControl instances for all monads in the base library</span>
<a name="line-330"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-331"></a>
<a name="line-332"></a><span class='hs-cpp'>#define BASE(M)                           \</span>
<a name="line-333"></a><a name="instance%20MonadBaseControl%20(M)%20(M)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadBaseControl</span> <span class='hs-layout'>(</span><span class='hs-conid'>M</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>M</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-layout'>{</span> <span class='hs-keyglyph'>\</span>
<a name="line-334"></a>    <span class='hs-keyword'>type</span> <span class='hs-conid'>StM</span> <span class='hs-layout'>(</span><span class='hs-conid'>M</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span><span class='hs-layout'>;</span>                   <span class='hs-keyglyph'>\</span>
<a name="line-335"></a>    <span class='hs-varid'>liftBaseWith</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-varid'>id</span><span class='hs-layout'>;</span>                <span class='hs-keyglyph'>\</span>
<a name="line-336"></a>    <span class='hs-varid'>restoreM</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span><span class='hs-layout'>;</span>                    <span class='hs-keyglyph'>\</span>
<a name="line-337"></a>    <span class='hs-comment'>{-# INLINABLE liftBaseWith #-}</span><span class='hs-layout'>;</span>       <span class='hs-keyglyph'>\</span>
<a name="line-338"></a>    <span class='hs-comment'>{-# INLINABLE restoreM #-}</span><span class='hs-layout'>}</span>
<a name="line-339"></a>
<a name="line-340"></a><span class='hs-conid'>BASE</span><span class='hs-layout'>(</span><span class='hs-conid'>IO</span><span class='hs-layout'>)</span>
<a name="line-341"></a><span class='hs-conid'>BASE</span><span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span><span class='hs-layout'>)</span>
<a name="line-342"></a><span class='hs-conid'>BASE</span><span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-343"></a><span class='hs-conid'>BASE</span><span class='hs-layout'>(</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-344"></a><span class='hs-conid'>BASE</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>-&gt;</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-345"></a><span class='hs-conid'>BASE</span><span class='hs-layout'>(</span><span class='hs-conid'>Identity</span><span class='hs-layout'>)</span>
<a name="line-346"></a>
<a name="line-347"></a><span class='hs-conid'>BASE</span><span class='hs-layout'>(</span><span class='hs-conid'>STM</span><span class='hs-layout'>)</span>
<a name="line-348"></a>
<a name="line-349"></a><span class='hs-cpp'>#if MIN_VERSION_base(4,4,0)</span>
<a name="line-350"></a><span class='hs-conid'>BASE</span><span class='hs-layout'>(</span><span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-conid'>ST</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-351"></a><span class='hs-conid'>BASE</span><span class='hs-layout'>(</span>       <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-352"></a><span class='hs-cpp'>#endif</span>
<a name="line-353"></a>
<a name="line-354"></a><span class='hs-cpp'>#undef BASE</span>
<a name="line-355"></a>
<a name="line-356"></a>
<a name="line-357"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-358"></a><span class='hs-comment'>-- Defaults for MonadBaseControl</span>
<a name="line-359"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-360"></a>
<a name="line-361"></a><span class='hs-comment'>-- $MonadBaseControlDefaults</span>
<a name="line-362"></a><span class='hs-comment'>--</span>
<a name="line-363"></a><span class='hs-comment'>-- Note that by using the following default definitions it's easy to make a</span>
<a name="line-364"></a><span class='hs-comment'>-- monad transformer @T@ an instance of 'MonadBaseControl':</span>
<a name="line-365"></a><span class='hs-comment'>--</span>
<a name="line-366"></a><span class='hs-comment'>-- @</span>
<a name="line-367"></a><span class='hs-comment'>-- instance MonadBaseControl b m =&gt; MonadBaseControl b (T m) where</span>
<a name="line-368"></a><span class='hs-comment'>--     type StM (T m) a = 'ComposeSt' T m a</span>
<a name="line-369"></a><span class='hs-comment'>--     liftBaseWith     = 'defaultLiftBaseWith'</span>
<a name="line-370"></a><span class='hs-comment'>--     restoreM         = 'defaultRestoreM'</span>
<a name="line-371"></a><span class='hs-comment'>-- @</span>
<a name="line-372"></a><span class='hs-comment'>--</span>
<a name="line-373"></a><span class='hs-comment'>-- Defining an instance for a base monad @B@ is equally straightforward:</span>
<a name="line-374"></a><span class='hs-comment'>--</span>
<a name="line-375"></a><span class='hs-comment'>-- @</span>
<a name="line-376"></a><span class='hs-comment'>-- instance MonadBaseControl B B where</span>
<a name="line-377"></a><span class='hs-comment'>--     type StM B a   = a</span>
<a name="line-378"></a><span class='hs-comment'>--     liftBaseWith f = f 'id'</span>
<a name="line-379"></a><span class='hs-comment'>--     restoreM       = 'return'</span>
<a name="line-380"></a><span class='hs-comment'>-- @</span>
<a name="line-381"></a>
<a name="line-382"></a><a name="ComposeSt"></a><span class='hs-comment'>-- | Handy type synonym that composes the monadic states of @t@ and @m@.</span>
<a name="line-383"></a><a name="ComposeSt"></a><span class='hs-comment'>--</span>
<a name="line-384"></a><a name="ComposeSt"></a><span class='hs-comment'>-- It can be used to define the 'StM' for new 'MonadBaseControl' instances.</span>
<a name="line-385"></a><a name="ComposeSt"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>ComposeSt</span> <span class='hs-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StM</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>StT</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-386"></a>
<a name="line-387"></a><a name="RunInBaseDefault"></a><span class='hs-comment'>-- | A function like 'RunInBase' that runs a monad transformer @t@ in its base</span>
<a name="line-388"></a><a name="RunInBaseDefault"></a><span class='hs-comment'>-- monad @b@. It is used in 'defaultLiftBaseWith'.</span>
<a name="line-389"></a><a name="RunInBaseDefault"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>RunInBaseDefault</span> <span class='hs-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>a</span><span class='hs-varop'>.</span> <span class='hs-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-conid'>ComposeSt</span> <span class='hs-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-390"></a>
<a name="line-391"></a><a name="defaultLiftBaseWith"></a><span class='hs-comment'>-- | Default defintion for the 'liftBaseWith' method.</span>
<a name="line-392"></a><span class='hs-comment'>--</span>
<a name="line-393"></a><span class='hs-comment'>-- Note that it composes a 'liftWith' of @t@ with a 'liftBaseWith' of @m@ to</span>
<a name="line-394"></a><span class='hs-comment'>-- give a 'liftBaseWith' of @t m@:</span>
<a name="line-395"></a><span class='hs-comment'>--</span>
<a name="line-396"></a><span class='hs-comment'>-- @</span>
<a name="line-397"></a><span class='hs-comment'>-- defaultLiftBaseWith = \\f -&gt; 'liftWith' $ \\run -&gt;</span>
<a name="line-398"></a><span class='hs-comment'>--                               'liftBaseWith' $ \\runInBase -&gt;</span>
<a name="line-399"></a><span class='hs-comment'>--                                 f $ runInBase . run</span>
<a name="line-400"></a><span class='hs-comment'>-- @</span>
<a name="line-401"></a><span class='hs-definition'>defaultLiftBaseWith</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadTransControl</span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadBaseControl</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-402"></a>                    <span class='hs-keyglyph'>=&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>RunInBaseDefault</span> <span class='hs-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-403"></a><span class='hs-definition'>defaultLiftBaseWith</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>f</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>liftWith</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>run</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-404"></a>                              <span class='hs-varid'>liftBaseWith</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>runInBase</span> <span class='hs-keyglyph'>-&gt;</span>
<a name="line-405"></a>                                <span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runInBase</span> <span class='hs-varop'>.</span> <span class='hs-varid'>run</span>
<a name="line-406"></a><span class='hs-comment'>{-# INLINABLE defaultLiftBaseWith #-}</span>
<a name="line-407"></a>
<a name="line-408"></a><a name="defaultRestoreM"></a><span class='hs-comment'>-- | Default definition for the 'restoreM' method.</span>
<a name="line-409"></a><span class='hs-comment'>--</span>
<a name="line-410"></a><span class='hs-comment'>-- Note that: @defaultRestoreM = 'restoreT' . 'restoreM'@</span>
<a name="line-411"></a><span class='hs-definition'>defaultRestoreM</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadTransControl</span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadBaseControl</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-412"></a>                <span class='hs-keyglyph'>=&gt;</span> <span class='hs-conid'>ComposeSt</span> <span class='hs-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-413"></a><span class='hs-definition'>defaultRestoreM</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>restoreT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>restoreM</span>
<a name="line-414"></a><span class='hs-comment'>{-# INLINABLE defaultRestoreM #-}</span>
<a name="line-415"></a>
<a name="line-416"></a>
<a name="line-417"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-418"></a><span class='hs-comment'>-- MonadBaseControl transformer instances</span>
<a name="line-419"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-420"></a>
<a name="line-421"></a><span class='hs-cpp'>#define BODY(T) {                         \</span>
<a name="line-422"></a>    <span class='hs-keyword'>type</span> <span class='hs-conid'>StM</span> <span class='hs-layout'>(</span><span class='hs-conid'>T</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'>ComposeSt</span> <span class='hs-layout'>(</span><span class='hs-conid'>T</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>;</span> <span class='hs-keyglyph'>\</span>
<a name="line-423"></a>    <span class='hs-varid'>liftBaseWith</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defaultLiftBaseWith</span><span class='hs-layout'>;</span>   <span class='hs-keyglyph'>\</span>
<a name="line-424"></a>    <span class='hs-varid'>restoreM</span>     <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defaultRestoreM</span><span class='hs-layout'>;</span>       <span class='hs-keyglyph'>\</span>
<a name="line-425"></a>    <span class='hs-comment'>{-# INLINABLE liftBaseWith #-}</span><span class='hs-layout'>;</span>       <span class='hs-keyglyph'>\</span>
<a name="line-426"></a>    <span class='hs-comment'>{-# INLINABLE restoreM #-}</span><span class='hs-layout'>}</span>
<a name="line-427"></a>
<a name="line-428"></a><span class='hs-cpp'>#define TRANS(         T) \</span>
<a name="line-429"></a>  <span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span>     <span class='hs-conid'>MonadBaseControl</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</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'>T</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-conid'>BODY</span><span class='hs-layout'>(</span><span class='hs-conid'>T</span><span class='hs-layout'>)</span>
<a name="line-430"></a><span class='hs-cpp'>#define TRANS_CTX(CTX, T) \</span>
<a name="line-431"></a>  <span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>CTX</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadBaseControl</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</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'>T</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-conid'>BODY</span><span class='hs-layout'>(</span><span class='hs-conid'>T</span><span class='hs-layout'>)</span>
<a name="line-432"></a>
<a name="line-433"></a><span class='hs-conid'>TRANS</span><span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span><span class='hs-layout'>)</span>
<a name="line-434"></a><span class='hs-conid'>TRANS</span><span class='hs-layout'>(</span><span class='hs-conid'>MaybeT</span><span class='hs-layout'>)</span>
<a name="line-435"></a><span class='hs-conid'>TRANS</span><span class='hs-layout'>(</span><span class='hs-conid'>ListT</span><span class='hs-layout'>)</span>
<a name="line-436"></a><span class='hs-conid'>TRANS</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-437"></a><span class='hs-conid'>TRANS</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-438"></a><span class='hs-conid'>TRANS</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-439"></a><span class='hs-conid'>TRANS</span><span class='hs-layout'>(</span><span class='hs-conid'>ExceptT</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-440"></a>
<a name="line-441"></a><span class='hs-conid'>TRANS_CTX</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-442"></a><span class='hs-conid'>TRANS_CTX</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-443"></a><span class='hs-conid'>TRANS_CTX</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-444"></a><span class='hs-conid'>TRANS_CTX</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-445"></a><span class='hs-conid'>TRANS_CTX</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-446"></a>
<a name="line-447"></a>
<a name="line-448"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-449"></a><span class='hs-comment'>-- * Utility functions</span>
<a name="line-450"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-451"></a>
<a name="line-452"></a><a name="control"></a><span class='hs-comment'>-- | An often used composition: @control f = 'liftBaseWith' f &gt;&gt;= 'restoreM'@</span>
<a name="line-453"></a><span class='hs-definition'>control</span> <span class='hs-keyglyph'>::</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-layout'>(</span><span class='hs-conid'>RunInBase</span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>b</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><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-454"></a><span class='hs-definition'>control</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftBaseWith</span> <span class='hs-varid'>f</span> <span class='hs-varop'>&gt;&gt;=</span> <span class='hs-varid'>restoreM</span>
<a name="line-455"></a><span class='hs-comment'>{-# INLINABLE control #-}</span>
<a name="line-456"></a>
<a name="line-457"></a><a name="embed"></a><span class='hs-comment'>-- | Embed a transformer function as an function in the base monad returning a</span>
<a name="line-458"></a><span class='hs-comment'>-- mutated transformer state.</span>
<a name="line-459"></a><span class='hs-definition'>embed</span> <span class='hs-keyglyph'>::</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-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-conid'>StM</span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-460"></a><span class='hs-definition'>embed</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <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> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>runInBase</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-461"></a><span class='hs-comment'>{-# INLINABLE embed #-}</span>
<a name="line-462"></a>
<a name="line-463"></a><a name="embed_"></a><span class='hs-comment'>-- | Performs the same function as 'embed', but discards transformer state</span>
<a name="line-464"></a><span class='hs-comment'>-- from the embedded function.</span>
<a name="line-465"></a><span class='hs-definition'>embed_</span> <span class='hs-keyglyph'>::</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-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>b</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-466"></a><span class='hs-definition'>embed_</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftBaseWith</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>runInBase</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>void</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runInBase</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-467"></a><span class='hs-comment'>{-# INLINABLE embed_ #-}</span>
<a name="line-468"></a>
<a name="line-469"></a><a name="captureT"></a><span class='hs-comment'>-- | Capture the current state of a transformer</span>
<a name="line-470"></a><span class='hs-definition'>captureT</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadTransControl</span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>StT</span> <span class='hs-varid'>t</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-471"></a><span class='hs-definition'>captureT</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftWith</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>runInM</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>runInM</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-472"></a><span class='hs-comment'>{-# INLINABLE captureT #-}</span>
<a name="line-473"></a>
<a name="line-474"></a><a name="captureM"></a><span class='hs-comment'>-- | Capture the current state above the base monad</span>
<a name="line-475"></a><span class='hs-definition'>captureM</span> <span class='hs-keyglyph'>::</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-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>StM</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-476"></a><span class='hs-definition'>captureM</span> <span class='hs-keyglyph'>=</span> <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> <span class='hs-varid'>runInBase</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-477"></a><span class='hs-comment'>{-# INLINABLE captureM #-}</span>
<a name="line-478"></a>
<a name="line-479"></a><a name="liftBaseOp"></a><span class='hs-comment'>-- | @liftBaseOp@ is a particular application of 'liftBaseWith' that allows</span>
<a name="line-480"></a><span class='hs-comment'>-- lifting control operations of type:</span>
<a name="line-481"></a><span class='hs-comment'>--</span>
<a name="line-482"></a><span class='hs-comment'>-- @((a -&gt; b c) -&gt; b c)@ to: @('MonadBaseControl' b m =&gt; (a -&gt; m c) -&gt; m c)@.</span>
<a name="line-483"></a><span class='hs-comment'>--</span>
<a name="line-484"></a><span class='hs-comment'>-- For example:</span>
<a name="line-485"></a><span class='hs-comment'>--</span>
<a name="line-486"></a><span class='hs-comment'>-- @liftBaseOp alloca :: 'MonadBaseControl' 'IO' m =&gt; (Ptr a -&gt; m c) -&gt; m c@</span>
<a name="line-487"></a><span class='hs-definition'>liftBaseOp</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadBaseControl</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span>
<a name="line-488"></a>           <span class='hs-keyglyph'>=&gt;</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-conid'>StM</span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-conid'>StM</span> <span class='hs-varid'>m</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-489"></a>           <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span>        <span class='hs-varid'>m</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>  <span class='hs-keyglyph'>-&gt;</span>        <span class='hs-varid'>m</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-490"></a><span class='hs-definition'>liftBaseOp</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>g</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>control</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>runInBase</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runInBase</span> <span class='hs-varop'>.</span> <span class='hs-varid'>g</span>
<a name="line-491"></a><span class='hs-comment'>{-# INLINABLE liftBaseOp #-}</span>
<a name="line-492"></a>
<a name="line-493"></a><a name="liftBaseOp_"></a><span class='hs-comment'>-- | @liftBaseOp_@ is a particular application of 'liftBaseWith' that allows</span>
<a name="line-494"></a><span class='hs-comment'>-- lifting control operations of type:</span>
<a name="line-495"></a><span class='hs-comment'>--</span>
<a name="line-496"></a><span class='hs-comment'>-- @(b a -&gt; b a)@ to: @('MonadBaseControl' b m =&gt; m a -&gt; m a)@.</span>
<a name="line-497"></a><span class='hs-comment'>--</span>
<a name="line-498"></a><span class='hs-comment'>-- For example:</span>
<a name="line-499"></a><span class='hs-comment'>--</span>
<a name="line-500"></a><span class='hs-comment'>-- @liftBaseOp_ mask_ :: 'MonadBaseControl' 'IO' m =&gt; m a -&gt; m a@</span>
<a name="line-501"></a><span class='hs-definition'>liftBaseOp_</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadBaseControl</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span>
<a name="line-502"></a>            <span class='hs-keyglyph'>=&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</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> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-conid'>StM</span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-503"></a>            <span class='hs-keyglyph'>-&gt;</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'>m</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-504"></a><span class='hs-definition'>liftBaseOp_</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>m</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>control</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>runInBase</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runInBase</span> <span class='hs-varid'>m</span>
<a name="line-505"></a><span class='hs-comment'>{-# INLINABLE liftBaseOp_ #-}</span>
<a name="line-506"></a>
<a name="line-507"></a><a name="liftBaseDiscard"></a><span class='hs-comment'>-- | @liftBaseDiscard@ is a particular application of 'liftBaseWith' that allows</span>
<a name="line-508"></a><span class='hs-comment'>-- lifting control operations of type:</span>
<a name="line-509"></a><span class='hs-comment'>--</span>
<a name="line-510"></a><span class='hs-comment'>-- @(b () -&gt; b a)@ to: @('MonadBaseControl' b m =&gt; m () -&gt; m a)@.</span>
<a name="line-511"></a><span class='hs-comment'>--</span>
<a name="line-512"></a><span class='hs-comment'>-- Note that, while the argument computation @m ()@ has access to the captured</span>
<a name="line-513"></a><span class='hs-comment'>-- state, all its side-effects in @m@ are discarded. It is run only for its</span>
<a name="line-514"></a><span class='hs-comment'>-- side-effects in the base monad @b@.</span>
<a name="line-515"></a><span class='hs-comment'>--</span>
<a name="line-516"></a><span class='hs-comment'>-- For example:</span>
<a name="line-517"></a><span class='hs-comment'>--</span>
<a name="line-518"></a><span class='hs-comment'>-- @liftBaseDiscard forkIO :: 'MonadBaseControl' 'IO' m =&gt; m () -&gt; m ThreadId@</span>
<a name="line-519"></a><span class='hs-definition'>liftBaseDiscard</span> <span class='hs-keyglyph'>::</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-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>b</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-varid'>m</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-layout'>)</span>
<a name="line-520"></a><span class='hs-definition'>liftBaseDiscard</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>m</span> <span class='hs-keyglyph'>-&gt;</span> <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> <span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-varid'>void</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runInBase</span> <span class='hs-varid'>m</span>
<a name="line-521"></a><span class='hs-comment'>{-# INLINABLE liftBaseDiscard #-}</span>
<a name="line-522"></a>
<a name="line-523"></a><a name="liftBaseOpDiscard"></a><span class='hs-comment'>-- | @liftBaseOpDiscard@ is a particular application of 'liftBaseWith' that allows</span>
<a name="line-524"></a><span class='hs-comment'>-- lifting control operations of type:</span>
<a name="line-525"></a><span class='hs-comment'>--</span>
<a name="line-526"></a><span class='hs-comment'>-- @((a -&gt; b ()) -&gt; b c)@ to: @('MonadBaseControl' b m =&gt; (a -&gt; m ()) -&gt; m c)@.</span>
<a name="line-527"></a><span class='hs-comment'>--</span>
<a name="line-528"></a><span class='hs-comment'>-- Note that, while the argument computation @m ()@ has access to the captured</span>
<a name="line-529"></a><span class='hs-comment'>-- state, all its side-effects in @m@ are discarded. It is run only for its</span>
<a name="line-530"></a><span class='hs-comment'>-- side-effects in the base monad @b@.</span>
<a name="line-531"></a><span class='hs-comment'>--</span>
<a name="line-532"></a><span class='hs-comment'>-- For example:</span>
<a name="line-533"></a><span class='hs-comment'>--</span>
<a name="line-534"></a><span class='hs-comment'>-- @liftBaseDiscard (runServer addr port) :: 'MonadBaseControl' 'IO' m =&gt; m () -&gt; m ()@</span>
<a name="line-535"></a><span class='hs-definition'>liftBaseOpDiscard</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadBaseControl</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span>
<a name="line-536"></a>                  <span class='hs-keyglyph'>=&gt;</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>b</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>b</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-537"></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-varid'>m</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span>
<a name="line-538"></a><span class='hs-definition'>liftBaseOpDiscard</span> <span class='hs-varid'>f</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftBaseWith</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>runInBase</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-varid'>void</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runInBase</span> <span class='hs-varop'>.</span> <span class='hs-varid'>g</span>
<a name="line-539"></a><span class='hs-comment'>{-# INLINABLE liftBaseOpDiscard #-}</span>
<a name="line-540"></a>
<a name="line-541"></a><a name="liftThrough"></a><span class='hs-comment'>-- | Transform an action in @t m@ using a transformer that operates on the underlying monad @m@</span>
<a name="line-542"></a><span class='hs-definition'>liftThrough</span>
<a name="line-543"></a>    <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadTransControl</span> <span class='hs-varid'>t</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-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-544"></a>    <span class='hs-keyglyph'>=&gt;</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>StT</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>StT</span> <span class='hs-varid'>t</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^</span>
<a name="line-545"></a>    <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span>
<a name="line-546"></a><span class='hs-definition'>liftThrough</span> <span class='hs-varid'>f</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-547"></a>  <span class='hs-varid'>st</span> <span class='hs-keyglyph'>&lt;-</span> <span class='hs-varid'>liftWith</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>run</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-keyword'>do</span>
<a name="line-548"></a>    <span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-varid'>run</span> <span class='hs-varid'>t</span>
<a name="line-549"></a>  <span class='hs-varid'>restoreT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>return</span> <span class='hs-varid'>st</span>
</pre></body>
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