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<title>src/Control/Comonad/Env/Class.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE MultiParamTypeClasses #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE FunctionalDependencies #-}</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 CPP #-}</span>
<a name="line-6"></a><span class='hs-cpp'>#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 702</span>
<a name="line-7"></a><span class='hs-comment'>{-# LANGUAGE Trustworthy #-}</span>
<a name="line-8"></a><span class='hs-cpp'>#endif</span>
<a name="line-9"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-10"></a><span class='hs-comment'>-- |</span>
<a name="line-11"></a><span class='hs-comment'>-- Module : Control.Comonad.Env.Class</span>
<a name="line-12"></a><span class='hs-comment'>-- Copyright : (C) 2008-2012 Edward Kmett</span>
<a name="line-13"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-14"></a><span class='hs-comment'>--</span>
<a name="line-15"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-16"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-17"></a><span class='hs-comment'>-- Portability : non-portable (fundeps, MPTCs)</span>
<a name="line-18"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-19"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Comonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Env</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span>
<a name="line-20"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>ComonadEnv</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>asks</span>
<a name="line-22"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Comonad</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Comonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span>
<a name="line-26"></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'>Comonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Env</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Env</span>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Comonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Store</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Comonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Traced</span>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Comonad</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-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Semigroup</span>
<a name="line-31"></a>
<a name="line-32"></a><a name="ComonadEnv"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Comonad</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ComonadEnv</span> <span class='hs-varid'>e</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>e</span> <span class='hs-keyword'>where</span>
<a name="line-33"></a> <span class='hs-varid'>ask</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>w</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>e</span>
<a name="line-34"></a>
<a name="line-35"></a><a name="asks"></a><span class='hs-definition'>asks</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ComonadEnv</span> <span class='hs-varid'>e</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>e'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>w</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>e'</span>
<a name="line-36"></a><span class='hs-definition'>asks</span> <span class='hs-varid'>f</span> <span class='hs-varid'>wa</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>ask</span> <span class='hs-varid'>wa</span><span class='hs-layout'>)</span>
<a name="line-37"></a><span class='hs-comment'>{-# INLINE asks #-}</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="instance%20ComonadEnv%20e%20(Env.EnvT%20e%20w)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Comonad</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ComonadEnv</span> <span class='hs-varid'>e</span> <span class='hs-layout'>(</span><span class='hs-conid'>Env</span><span class='hs-varop'>.</span><span class='hs-conid'>EnvT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-40"></a> <span class='hs-varid'>ask</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Env</span><span class='hs-varop'>.</span><span class='hs-varid'>ask</span>
<a name="line-41"></a>
<a name="line-42"></a><a name="instance%20ComonadEnv%20e%20((,)e)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ComonadEnv</span> <span class='hs-varid'>e</span> <span class='hs-layout'>(</span><span class='hs-conid'>(,)</span><span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-43"></a> <span class='hs-varid'>ask</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fst</span>
<a name="line-44"></a>
<a name="line-45"></a><a name="lowerAsk"></a><span class='hs-definition'>lowerAsk</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>ComonadEnv</span> <span class='hs-varid'>e</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>ComonadTrans</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>t</span> <span class='hs-varid'>w</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>e</span>
<a name="line-46"></a><span class='hs-definition'>lowerAsk</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ask</span> <span class='hs-varop'>.</span> <span class='hs-varid'>lower</span>
<a name="line-47"></a><span class='hs-comment'>{-# INLINE lowerAsk #-}</span>
<a name="line-48"></a>
<a name="line-49"></a><a name="instance%20ComonadEnv%20e%20(StoreT%20t%20w)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ComonadEnv</span> <span class='hs-varid'>e</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ComonadEnv</span> <span class='hs-varid'>e</span> <span class='hs-layout'>(</span><span class='hs-conid'>StoreT</span> <span class='hs-varid'>t</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-50"></a> <span class='hs-varid'>ask</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lowerAsk</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="instance%20ComonadEnv%20e%20(IdentityT%20w)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ComonadEnv</span> <span class='hs-varid'>e</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ComonadEnv</span> <span class='hs-varid'>e</span> <span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-53"></a> <span class='hs-varid'>ask</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lowerAsk</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="instance%20ComonadEnv%20e%20(TracedT%20m%20w)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>ComonadEnv</span> <span class='hs-varid'>e</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ComonadEnv</span> <span class='hs-varid'>e</span> <span class='hs-layout'>(</span><span class='hs-conid'>TracedT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-56"></a> <span class='hs-varid'>ask</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lowerAsk</span>
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