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<title>src/Control/Lens/Zoom.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE TypeFamilies #-}</span>
<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE FlexibleInstances #-}</span>
<a name="line-4"></a><span class='hs-comment'>{-# LANGUAGE UndecidableInstances #-}</span>
<a name="line-5"></a><span class='hs-comment'>{-# LANGUAGE MultiParamTypeClasses #-}</span>
<a name="line-6"></a><span class='hs-comment'>{-# LANGUAGE FunctionalDependencies #-}</span>
<a name="line-7"></a><span class='hs-comment'>{-# OPTIONS_GHC -fno-warn-warnings-deprecations #-}</span>
<a name="line-8"></a>
<a name="line-9"></a><span class='hs-cpp'>#ifndef MIN_VERSION_mtl</span>
<a name="line-10"></a><span class='hs-cpp'>#define MIN_VERSION_mtl(x,y,z) 1</span>
<a name="line-11"></a><span class='hs-cpp'>#endif</span>
<a name="line-12"></a>
<a name="line-13"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ < 708</span>
<a name="line-14"></a><span class='hs-comment'>{-# LANGUAGE Trustworthy #-}</span>
<a name="line-15"></a><span class='hs-cpp'>#endif</span>
<a name="line-16"></a>
<a name="line-17"></a><span class='hs-comment'>-------------------------------------------------------------------------------</span>
<a name="line-18"></a><span class='hs-comment'>-- |</span>
<a name="line-19"></a><span class='hs-comment'>-- Module : Control.Lens.Zoom</span>
<a name="line-20"></a><span class='hs-comment'>-- Copyright : (C) 2012-16 Edward Kmett</span>
<a name="line-21"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-22"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-23"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-24"></a><span class='hs-comment'>-- Portability : Rank2Types</span>
<a name="line-25"></a><span class='hs-comment'>--</span>
<a name="line-26"></a><span class='hs-comment'>-------------------------------------------------------------------------------</span>
<a name="line-27"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-conid'>Zoom</span>
<a name="line-28"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>Magnified</span>
<a name="line-29"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Magnify</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-30"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Zoom</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-31"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Zoomed</span>
<a name="line-32"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-33"></a>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-conid'>Getter</span>
<a name="line-35"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Zoom</span>
<a name="line-36"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-conid'>Type</span>
<a name="line-37"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-38"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Reader</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Reader</span>
<a name="line-39"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>State</span>
<a name="line-40"></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-varop'>.</span><span class='hs-conid'>Lazy</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Lazy</span>
<a name="line-41"></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-varop'>.</span><span class='hs-conid'>Strict</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Strict</span>
<a name="line-42"></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-varop'>.</span><span class='hs-conid'>Lazy</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Lazy</span>
<a name="line-43"></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-varop'>.</span><span class='hs-conid'>Strict</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Strict</span>
<a name="line-44"></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-varop'>.</span><span class='hs-conid'>Lazy</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Lazy</span>
<a name="line-45"></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-varop'>.</span><span class='hs-conid'>Strict</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Strict</span>
<a name="line-46"></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>
<a name="line-47"></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>
<a name="line-48"></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>
<a name="line-49"></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>
<a name="line-50"></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>
<a name="line-51"></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'>Free</span>
<a name="line-52"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span>
<a name="line-53"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Profunctor</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span>
<a name="line-54"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span>
<a name="line-55"></a>
<a name="line-56"></a><span class='hs-cpp'>#ifdef HLINT</span>
<a name="line-57"></a><span class='hs-comment'>{-# ANN module "HLint: ignore Use fmap" #-}</span>
<a name="line-58"></a><span class='hs-cpp'>#endif</span>
<a name="line-59"></a>
<a name="line-60"></a><span class='hs-comment'>-- $setup</span>
<a name="line-61"></a><span class='hs-comment'>-- >>> import Control.Lens</span>
<a name="line-62"></a><span class='hs-comment'>-- >>> import Control.Monad.State</span>
<a name="line-63"></a><span class='hs-comment'>-- >>> import Data.Map as Map</span>
<a name="line-64"></a><span class='hs-comment'>-- >>> import Debug.SimpleReflect.Expr as Expr</span>
<a name="line-65"></a><span class='hs-comment'>-- >>> import Debug.SimpleReflect.Vars as Vars</span>
<a name="line-66"></a><span class='hs-comment'>-- >>> let f :: Expr -> Expr; f = Debug.SimpleReflect.Vars.f</span>
<a name="line-67"></a><span class='hs-comment'>-- >>> let g :: Expr -> Expr; g = Debug.SimpleReflect.Vars.g</span>
<a name="line-68"></a><span class='hs-comment'>-- >>> let h :: Expr -> Expr -> Expr; h = Debug.SimpleReflect.Vars.h</span>
<a name="line-69"></a>
<a name="line-70"></a><span class='hs-comment'>-- Chosen so that they have lower fixity than ('%='), and to match ('<~').</span>
<a name="line-71"></a><span class='hs-keyword'>infixr</span> <span class='hs-num'>2</span> <span class='hs-varop'>`zoom`</span><span class='hs-layout'>,</span> <span class='hs-varop'>`magnify`</span>
<a name="line-72"></a>
<a name="line-73"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-74"></a><span class='hs-comment'>-- Zoomed</span>
<a name="line-75"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-76"></a>
<a name="line-77"></a><a name="Zoomed"></a><span class='hs-comment'>-- | This type family is used by 'Control.Lens.Zoom.Zoom' to describe the common effect type.</span>
<a name="line-78"></a><a name="Zoomed"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>family</span> <span class='hs-conid'>Zoomed</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>*</span> <span class='hs-keyglyph'>-></span> <span class='hs-varop'>*</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>*</span> <span class='hs-keyglyph'>-></span> <span class='hs-varop'>*</span> <span class='hs-keyglyph'>-></span> <span class='hs-varop'>*</span>
<a name="line-79"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoomed</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-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Focusing</span> <span class='hs-varid'>z</span>
<a name="line-80"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoomed</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Focusing</span> <span class='hs-varid'>z</span>
<a name="line-81"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoomed</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Zoomed</span> <span class='hs-varid'>m</span>
<a name="line-82"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoomed</span> <span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Zoomed</span> <span class='hs-varid'>m</span>
<a name="line-83"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoomed</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-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FocusingWith</span> <span class='hs-varid'>w</span> <span class='hs-varid'>z</span>
<a name="line-84"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoomed</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lazy</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-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FocusingWith</span> <span class='hs-varid'>w</span> <span class='hs-varid'>z</span>
<a name="line-85"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoomed</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-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FocusingPlus</span> <span class='hs-varid'>w</span> <span class='hs-layout'>(</span><span class='hs-conid'>Zoomed</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-86"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoomed</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FocusingPlus</span> <span class='hs-varid'>w</span> <span class='hs-layout'>(</span><span class='hs-conid'>Zoomed</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-87"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoomed</span> <span class='hs-layout'>(</span><span class='hs-conid'>ListT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FocusingOn</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-conid'>Zoomed</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-88"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoomed</span> <span class='hs-layout'>(</span><span class='hs-conid'>MaybeT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FocusingMay</span> <span class='hs-layout'>(</span><span class='hs-conid'>Zoomed</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-89"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoomed</span> <span class='hs-layout'>(</span><span class='hs-conid'>ErrorT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FocusingErr</span> <span class='hs-varid'>e</span> <span class='hs-layout'>(</span><span class='hs-conid'>Zoomed</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-90"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoomed</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FocusingErr</span> <span class='hs-varid'>e</span> <span class='hs-layout'>(</span><span class='hs-conid'>Zoomed</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-91"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoomed</span> <span class='hs-layout'>(</span><span class='hs-conid'>FreeT</span> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FocusingFree</span> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Zoomed</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-92"></a>
<a name="line-93"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-94"></a><span class='hs-comment'>-- Magnified</span>
<a name="line-95"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-96"></a>
<a name="line-97"></a><a name="Magnified"></a><span class='hs-comment'>-- | This type family is used by 'Control.Lens.Zoom.Magnify' to describe the common effect type.</span>
<a name="line-98"></a><a name="Magnified"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>family</span> <span class='hs-conid'>Magnified</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>*</span> <span class='hs-keyglyph'>-></span> <span class='hs-varop'>*</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>*</span> <span class='hs-keyglyph'>-></span> <span class='hs-varop'>*</span> <span class='hs-keyglyph'>-></span> <span class='hs-varop'>*</span>
<a name="line-99"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Magnified</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Effect</span> <span class='hs-varid'>m</span>
<a name="line-100"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Magnified</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>-></span><span class='hs-layout'>)</span><span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Const</span>
<a name="line-101"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Magnified</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'>a</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EffectRWS</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span>
<a name="line-102"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Magnified</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>a</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EffectRWS</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span>
<a name="line-103"></a><span class='hs-keyword'>type</span> <span class='hs-keyword'>instance</span> <span class='hs-conid'>Magnified</span> <span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Magnified</span> <span class='hs-varid'>m</span>
<a name="line-104"></a>
<a name="line-105"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-106"></a><span class='hs-comment'>-- Zoom</span>
<a name="line-107"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-108"></a>
<a name="line-109"></a><a name="Zoom"></a><span class='hs-comment'>-- | This class allows us to use 'zoom' in, changing the 'State' supplied by</span>
<a name="line-110"></a><a name="Zoom"></a><span class='hs-comment'>-- many different 'Control.Monad.Monad' transformers, potentially quite</span>
<a name="line-111"></a><a name="Zoom"></a><span class='hs-comment'>-- deep in a 'Monad' transformer stack.</span>
<a name="line-112"></a><a name="Zoom"></a><span class='hs-keyword'>class</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadState</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadState</span> <span class='hs-varid'>t</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Zoom</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-varid'>m</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>n</span><span class='hs-layout'>,</span> <span class='hs-varid'>n</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-keyword'>where</span>
<a name="line-113"></a> <span class='hs-comment'>-- | Run a monadic action in a larger 'State' than it was defined in,</span>
<a name="line-114"></a> <span class='hs-comment'>-- using a 'Lens'' or 'Control.Lens.Traversal.Traversal''.</span>
<a name="line-115"></a> <span class='hs-comment'>--</span>
<a name="line-116"></a> <span class='hs-comment'>-- This is commonly used to lift actions in a simpler 'State'</span>
<a name="line-117"></a> <span class='hs-comment'>-- 'Monad' into a 'State' 'Monad' with a larger 'State' type.</span>
<a name="line-118"></a> <span class='hs-comment'>--</span>
<a name="line-119"></a> <span class='hs-comment'>-- When applied to a 'Control.Lens.Traversal.Traversal'' over</span>
<a name="line-120"></a> <span class='hs-comment'>-- multiple values, the actions for each target are executed sequentially</span>
<a name="line-121"></a> <span class='hs-comment'>-- and the results are aggregated.</span>
<a name="line-122"></a> <span class='hs-comment'>--</span>
<a name="line-123"></a> <span class='hs-comment'>-- This can be used to edit pretty much any 'Monad' transformer stack with a 'State' in it!</span>
<a name="line-124"></a> <span class='hs-comment'>--</span>
<a name="line-125"></a> <span class='hs-comment'>-- >>> flip State.evalState (a,b) $ zoom _1 $ use id</span>
<a name="line-126"></a> <span class='hs-comment'>-- a</span>
<a name="line-127"></a> <span class='hs-comment'>--</span>
<a name="line-128"></a> <span class='hs-comment'>-- >>> flip State.execState (a,b) $ zoom _1 $ id .= c</span>
<a name="line-129"></a> <span class='hs-comment'>-- (c,b)</span>
<a name="line-130"></a> <span class='hs-comment'>--</span>
<a name="line-131"></a> <span class='hs-comment'>-- >>> flip State.execState [(a,b),(c,d)] $ zoom traverse $ _2 %= f</span>
<a name="line-132"></a> <span class='hs-comment'>-- [(a,f b),(c,f d)]</span>
<a name="line-133"></a> <span class='hs-comment'>--</span>
<a name="line-134"></a> <span class='hs-comment'>-- >>> flip State.runState [(a,b),(c,d)] $ zoom traverse $ _2 <%= f</span>
<a name="line-135"></a> <span class='hs-comment'>-- (f b <> f d <> mempty,[(a,f b),(c,f d)])</span>
<a name="line-136"></a> <span class='hs-comment'>--</span>
<a name="line-137"></a> <span class='hs-comment'>-- >>> flip State.evalState (a,b) $ zoom both (use id)</span>
<a name="line-138"></a> <span class='hs-comment'>-- a <> b</span>
<a name="line-139"></a> <span class='hs-comment'>--</span>
<a name="line-140"></a> <span class='hs-comment'>-- @</span>
<a name="line-141"></a> <span class='hs-comment'>-- 'zoom' :: 'Monad' m => 'Lens'' s t -> 'StateT' t m a -> 'StateT' s m a</span>
<a name="line-142"></a> <span class='hs-comment'>-- 'zoom' :: ('Monad' m, 'Monoid' c) => 'Control.Lens.Traversal.Traversal'' s t -> 'StateT' t m c -> 'StateT' s m c</span>
<a name="line-143"></a> <span class='hs-comment'>-- 'zoom' :: ('Monad' m, 'Monoid' w) => 'Lens'' s t -> 'RWST' r w t m c -> 'RWST' r w s m c</span>
<a name="line-144"></a> <span class='hs-comment'>-- 'zoom' :: ('Monad' m, 'Monoid' w, 'Monoid' c) => 'Control.Lens.Traversal.Traversal'' s t -> 'RWST' r w t m c -> 'RWST' r w s m c</span>
<a name="line-145"></a> <span class='hs-comment'>-- 'zoom' :: ('Monad' m, 'Monoid' w, 'Error' e) => 'Lens'' s t -> 'ErrorT' e ('RWST' r w t m) c -> 'ErrorT' e ('RWST' r w s m) c</span>
<a name="line-146"></a> <span class='hs-comment'>-- 'zoom' :: ('Monad' m, 'Monoid' w, 'Monoid' c, 'Error' e) => 'Control.Lens.Traversal.Traversal'' s t -> 'ErrorT' e ('RWST' r w t m) c -> 'ErrorT' e ('RWST' r w s m) c</span>
<a name="line-147"></a> <span class='hs-comment'>-- ...</span>
<a name="line-148"></a> <span class='hs-comment'>-- @</span>
<a name="line-149"></a> <span class='hs-varid'>zoom</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LensLike'</span> <span class='hs-layout'>(</span><span class='hs-conid'>Zoomed</span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varid'>t</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>n</span> <span class='hs-varid'>c</span>
<a name="line-150"></a>
<a name="line-151"></a><a name="instance%20Zoom%20(Strict.StateT%20s%20z)%20(Strict.StateT%20t%20z)%20s%20t"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>z</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Zoom</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-varid'>z</span><span class='hs-layout'>)</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'>t</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>where</span>
<a name="line-152"></a> <span class='hs-varid'>zoom</span> <span class='hs-varid'>l</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'>m</span><span class='hs-layout'>)</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'>$</span> <span class='hs-varid'>unfocusing</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>Focusing</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-153"></a> <span class='hs-comment'>{-# INLINE zoom #-}</span>
<a name="line-154"></a>
<a name="line-155"></a><a name="instance%20Zoom%20(Lazy.StateT%20s%20z)%20(Lazy.StateT%20t%20z)%20s%20t"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>z</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Zoom</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>t</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>where</span>
<a name="line-156"></a> <span class='hs-varid'>zoom</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unfocusing</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>Focusing</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-157"></a> <span class='hs-comment'>{-# INLINE zoom #-}</span>
<a name="line-158"></a>
<a name="line-159"></a><a name="instance%20Zoom%20(ReaderT%20e%20m)%20(ReaderT%20e%20n)%20s%20t"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoom</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Zoom</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>where</span>
<a name="line-160"></a> <span class='hs-varid'>zoom</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ReaderT</span> <span class='hs-layout'>(</span><span class='hs-varid'>zoom</span> <span class='hs-varid'>l</span> <span class='hs-varop'>.</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-161"></a> <span class='hs-comment'>{-# INLINE zoom #-}</span>
<a name="line-162"></a>
<a name="line-163"></a><a name="instance%20Zoom%20(IdentityT%20m)%20(IdentityT%20n)%20s%20t"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoom</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Zoom</span> <span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>where</span>
<a name="line-164"></a> <span class='hs-varid'>zoom</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IdentityT</span> <span class='hs-layout'>(</span><span class='hs-varid'>zoom</span> <span class='hs-varid'>l</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-165"></a> <span class='hs-comment'>{-# INLINE zoom #-}</span>
<a name="line-166"></a>
<a name="line-167"></a><a name="instance%20Zoom%20(Strict.RWST%20r%20w%20s%20z)%20(Strict.RWST%20r%20w%20t%20z)%20s%20t"></a><span class='hs-keyword'>instance</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'>Monad</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Zoom</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-varid'>z</span><span class='hs-layout'>)</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'>t</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>where</span>
<a name="line-168"></a> <span class='hs-varid'>zoom</span> <span class='hs-varid'>l</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'>m</span><span class='hs-layout'>)</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-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>unfocusingWith</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>FocusingWith</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-169"></a> <span class='hs-comment'>{-# INLINE zoom #-}</span>
<a name="line-170"></a>
<a name="line-171"></a><a name="instance%20Zoom%20(Lazy.RWST%20r%20w%20s%20z)%20(Lazy.RWST%20r%20w%20t%20z)%20s%20t"></a><span class='hs-keyword'>instance</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'>Monad</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Zoom</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lazy</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-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lazy</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'>t</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>where</span>
<a name="line-172"></a> <span class='hs-varid'>zoom</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lazy</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-keyglyph'>-></span> <span class='hs-varid'>unfocusingWith</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>FocusingWith</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-173"></a> <span class='hs-comment'>{-# INLINE zoom #-}</span>
<a name="line-174"></a>
<a name="line-175"></a><a name="instance%20Zoom%20(Strict.WriterT%20w%20m)%20(Strict.WriterT%20w%20n)%20s%20t"></a><span class='hs-keyword'>instance</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'>Zoom</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Zoom</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-varid'>m</span><span class='hs-layout'>)</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-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>where</span>
<a name="line-176"></a> <span class='hs-varid'>zoom</span> <span class='hs-varid'>l</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'>zoom</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>afb</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>unfocusingPlus</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>FocusingPlus</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>afb</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Strict</span><span class='hs-varop'>.</span><span class='hs-varid'>runWriterT</span>
<a name="line-177"></a> <span class='hs-comment'>{-# INLINE zoom #-}</span>
<a name="line-178"></a>
<a name="line-179"></a><a name="instance%20Zoom%20(Lazy.WriterT%20w%20m)%20(Lazy.WriterT%20w%20n)%20s%20t"></a><span class='hs-keyword'>instance</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'>Zoom</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Zoom</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>where</span>
<a name="line-180"></a> <span class='hs-varid'>zoom</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>zoom</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>afb</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>unfocusingPlus</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>FocusingPlus</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>afb</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-varid'>runWriterT</span>
<a name="line-181"></a> <span class='hs-comment'>{-# INLINE zoom #-}</span>
<a name="line-182"></a>
<a name="line-183"></a><a name="instance%20Zoom%20(ListT%20m)%20(ListT%20n)%20s%20t"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoom</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Zoom</span> <span class='hs-layout'>(</span><span class='hs-conid'>ListT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ListT</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>where</span>
<a name="line-184"></a> <span class='hs-varid'>zoom</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ListT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>zoom</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>afb</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>unfocusingOn</span> <span class='hs-varop'>.</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>FocusingOn</span> <span class='hs-varop'>.</span> <span class='hs-varid'>afb</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runListT</span>
<a name="line-185"></a> <span class='hs-comment'>{-# INLINE zoom #-}</span>
<a name="line-186"></a>
<a name="line-187"></a><a name="instance%20Zoom%20(MaybeT%20m)%20(MaybeT%20n)%20s%20t"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoom</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Zoom</span> <span class='hs-layout'>(</span><span class='hs-conid'>MaybeT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>MaybeT</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>where</span>
<a name="line-188"></a> <span class='hs-varid'>zoom</span> <span class='hs-varid'>l</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'>getMay</span> <span class='hs-varop'>.</span> <span class='hs-varid'>zoom</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>afb</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>unfocusingMay</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>FocusingMay</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>afb</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>May</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runMaybeT</span>
<a name="line-189"></a> <span class='hs-comment'>{-# INLINE zoom #-}</span>
<a name="line-190"></a>
<a name="line-191"></a><a name="instance%20Zoom%20(ErrorT%20e%20m)%20(ErrorT%20e%20n)%20s%20t"></a><span class='hs-keyword'>instance</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'>Zoom</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Zoom</span> <span class='hs-layout'>(</span><span class='hs-conid'>ErrorT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ErrorT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>where</span>
<a name="line-192"></a> <span class='hs-varid'>zoom</span> <span class='hs-varid'>l</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'>getErr</span> <span class='hs-varop'>.</span> <span class='hs-varid'>zoom</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>afb</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>unfocusingErr</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>FocusingErr</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>afb</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>Err</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runErrorT</span>
<a name="line-193"></a> <span class='hs-comment'>{-# INLINE zoom #-}</span>
<a name="line-194"></a>
<a name="line-195"></a><a name="instance%20Zoom%20(ExceptT%20e%20m)%20(ExceptT%20e%20n)%20s%20t"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Zoom</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Zoom</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>where</span>
<a name="line-196"></a> <span class='hs-varid'>zoom</span> <span class='hs-varid'>l</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'>getErr</span> <span class='hs-varop'>.</span> <span class='hs-varid'>zoom</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>afb</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>unfocusingErr</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>FocusingErr</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>afb</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>Err</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runExceptT</span>
<a name="line-197"></a> <span class='hs-comment'>{-# INLINE zoom #-}</span>
<a name="line-198"></a>
<a name="line-199"></a><a name="instance%20Zoom%20(FreeT%20f%20m)%20(FreeT%20f%20n)%20s%20t"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Functor</span> <span class='hs-varid'>f</span><span class='hs-layout'>,</span> <span class='hs-conid'>Zoom</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Zoom</span> <span class='hs-layout'>(</span><span class='hs-conid'>FreeT</span> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>FreeT</span> <span class='hs-varid'>f</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>where</span>
<a name="line-200"></a> <span class='hs-varid'>zoom</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FreeT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>liftM</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-varop'>$</span> <span class='hs-varid'>zoom</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>liftM</span> <span class='hs-varid'>getFreed</span> <span class='hs-varop'>.</span> <span class='hs-varid'>zoom</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>afb</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>unfocusingFree</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>FocusingFree</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>afb</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>Freed</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runFreeT</span>
<a name="line-201"></a>
<a name="line-202"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-203"></a><span class='hs-comment'>-- Magnify</span>
<a name="line-204"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-205"></a>
<a name="line-206"></a><span class='hs-comment'>-- TODO: instance Zoom m m a a => Zoom (ContT r m) (ContT r m) a a where</span>
<a name="line-207"></a>
<a name="line-208"></a><a name="Magnify"></a><span class='hs-comment'>-- | This class allows us to use 'magnify' part of the environment, changing the environment supplied by</span>
<a name="line-209"></a><a name="Magnify"></a><span class='hs-comment'>-- many different 'Monad' transformers. Unlike 'zoom' this can change the environment of a deeply nested 'Monad' transformer.</span>
<a name="line-210"></a><a name="Magnify"></a><span class='hs-comment'>--</span>
<a name="line-211"></a><a name="Magnify"></a><span class='hs-comment'>-- Also, unlike 'zoom', this can be used with any valid 'Getter', but cannot be used with a 'Traversal' or 'Fold'.</span>
<a name="line-212"></a><a name="Magnify"></a><span class='hs-keyword'>class</span> <span class='hs-layout'>(</span><span class='hs-conid'>Magnified</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>~</span> <span class='hs-conid'>Magnified</span> <span class='hs-varid'>n</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadReader</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadReader</span> <span class='hs-varid'>a</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Magnify</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>n</span><span class='hs-layout'>,</span> <span class='hs-varid'>n</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-keyword'>where</span>
<a name="line-213"></a> <span class='hs-comment'>-- | Run a monadic action in a larger environment than it was defined in, using a 'Getter'.</span>
<a name="line-214"></a> <span class='hs-comment'>--</span>
<a name="line-215"></a> <span class='hs-comment'>-- This acts like 'Control.Monad.Reader.Class.local', but can in many cases change the type of the environment as well.</span>
<a name="line-216"></a> <span class='hs-comment'>--</span>
<a name="line-217"></a> <span class='hs-comment'>-- This is commonly used to lift actions in a simpler 'Reader' 'Monad' into a 'Monad' with a larger environment type.</span>
<a name="line-218"></a> <span class='hs-comment'>--</span>
<a name="line-219"></a> <span class='hs-comment'>-- This can be used to edit pretty much any 'Monad' transformer stack with an environment in it:</span>
<a name="line-220"></a> <span class='hs-comment'>--</span>
<a name="line-221"></a> <span class='hs-comment'>-- >>> (1,2) & magnify _2 (+1)</span>
<a name="line-222"></a> <span class='hs-comment'>-- 3</span>
<a name="line-223"></a> <span class='hs-comment'>--</span>
<a name="line-224"></a> <span class='hs-comment'>-- >>> flip Reader.runReader (1,2) $ magnify _1 Reader.ask</span>
<a name="line-225"></a> <span class='hs-comment'>-- 1</span>
<a name="line-226"></a> <span class='hs-comment'>--</span>
<a name="line-227"></a> <span class='hs-comment'>-- >>> flip Reader.runReader (1,2,[10..20]) $ magnify (_3._tail) Reader.ask</span>
<a name="line-228"></a> <span class='hs-comment'>-- [11,12,13,14,15,16,17,18,19,20]</span>
<a name="line-229"></a> <span class='hs-comment'>--</span>
<a name="line-230"></a> <span class='hs-comment'>-- @</span>
<a name="line-231"></a> <span class='hs-comment'>-- 'magnify' :: 'Getter' s a -> (a -> r) -> s -> r</span>
<a name="line-232"></a> <span class='hs-comment'>-- 'magnify' :: 'Monoid' r => 'Fold' s a -> (a -> r) -> s -> r</span>
<a name="line-233"></a> <span class='hs-comment'>-- @</span>
<a name="line-234"></a> <span class='hs-comment'>--</span>
<a name="line-235"></a> <span class='hs-comment'>-- @</span>
<a name="line-236"></a> <span class='hs-comment'>-- 'magnify' :: 'Monoid' w => 'Getter' s t -> 'RWS' t w st c -> 'RWS' s w st c</span>
<a name="line-237"></a> <span class='hs-comment'>-- 'magnify' :: ('Monoid' w, 'Monoid' c) => 'Fold' s a -> 'RWS' a w st c -> 'RWS' s w st c</span>
<a name="line-238"></a> <span class='hs-comment'>-- ...</span>
<a name="line-239"></a> <span class='hs-comment'>-- @</span>
<a name="line-240"></a> <span class='hs-varid'>magnify</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LensLike'</span> <span class='hs-layout'>(</span><span class='hs-conid'>Magnified</span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>n</span> <span class='hs-varid'>c</span>
<a name="line-241"></a>
<a name="line-242"></a><a name="instance%20Magnify%20(ReaderT%20b%20m)%20(ReaderT%20a%20m)%20b%20a"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Magnify</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-243"></a> <span class='hs-varid'>magnify</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ReaderT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>getEffect</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>Effect</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-244"></a> <span class='hs-comment'>{-# INLINE magnify #-}</span>
<a name="line-245"></a>
<a name="line-246"></a><a name="instance%20Magnify%20((-%3e)%20b)%20((-%3e)%20a)%20b%20a"></a><span class='hs-comment'>-- | @</span>
<a name="line-247"></a><a name="instance%20Magnify%20((-%3e)%20b)%20((-%3e)%20a)%20b%20a"></a><span class='hs-comment'>-- 'magnify' = 'views'</span>
<a name="line-248"></a><a name="instance%20Magnify%20((-%3e)%20b)%20((-%3e)%20a)%20b%20a"></a><span class='hs-comment'>-- @</span>
<a name="line-249"></a><a name="instance%20Magnify%20((-%3e)%20b)%20((-%3e)%20a)%20b%20a"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Magnify</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>-></span><span class='hs-layout'>)</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</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'>b</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-250"></a> <span class='hs-varid'>magnify</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>views</span>
<a name="line-251"></a> <span class='hs-comment'>{-# INLINE magnify #-}</span>
<a name="line-252"></a>
<a name="line-253"></a><a name="instance%20Magnify%20(Strict.RWST%20b%20w%20s%20m)%20(Strict.RWST%20a%20w%20s%20m)%20b%20a"></a><span class='hs-keyword'>instance</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'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Magnify</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'>b</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</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'>a</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-254"></a> <span class='hs-varid'>magnify</span> <span class='hs-varid'>l</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'>m</span><span class='hs-layout'>)</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-varid'>getEffectRWS</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>EffectRWS</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-255"></a> <span class='hs-comment'>{-# INLINE magnify #-}</span>
<a name="line-256"></a>
<a name="line-257"></a><a name="instance%20Magnify%20(Lazy.RWST%20b%20w%20s%20m)%20(Lazy.RWST%20a%20w%20s%20m)%20b%20a"></a><span class='hs-keyword'>instance</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'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Magnify</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>b</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>a</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-258"></a> <span class='hs-varid'>magnify</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varop'>$</span> <span class='hs-varid'>getEffectRWS</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>EffectRWS</span> <span class='hs-cpp'>#.</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-259"></a> <span class='hs-comment'>{-# INLINE magnify #-}</span>
<a name="line-260"></a>
<a name="line-261"></a><a name="instance%20Magnify%20(IdentityT%20m)%20(IdentityT%20n)%20b%20a"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Magnify</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Magnify</span> <span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-262"></a> <span class='hs-varid'>magnify</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IdentityT</span> <span class='hs-layout'>(</span><span class='hs-varid'>magnify</span> <span class='hs-varid'>l</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-263"></a> <span class='hs-comment'>{-# INLINE magnify #-}</span>
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