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<title>src/Control/Lens/Internal/Review.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE TypeFamilies #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE FlexibleContexts #-}</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'>-----------------------------------------------------------------------------</span>
<a name="line-7"></a><span class='hs-comment'>-- |</span>
<a name="line-8"></a><span class='hs-comment'>-- Module : Control.Lens.Internal.Review</span>
<a name="line-9"></a><span class='hs-comment'>-- Copyright : (C) 2012-2015 Edward Kmett</span>
<a name="line-10"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-11"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-12"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-13"></a><span class='hs-comment'>-- Portability : non-portable</span>
<a name="line-14"></a><span class='hs-comment'>--</span>
<a name="line-15"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-16"></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'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Review</span>
<a name="line-17"></a> <span class='hs-layout'>(</span>
<a name="line-18"></a> <span class='hs-comment'>-- * Internal Classes</span>
<a name="line-19"></a> <span class='hs-conid'>Reviewable</span>
<a name="line-20"></a> <span class='hs-comment'>-- * Reviews</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>retagged</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'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Bifunctor</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Profunctor</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Void</span>
<a name="line-27"></a>
<a name="line-28"></a><a name="Reviewable"></a><span class='hs-comment'>-- | This class is provided mostly for backwards compatibility with lens 3.8,</span>
<a name="line-29"></a><a name="Reviewable"></a><span class='hs-comment'>-- but it can also shorten type signatures.</span>
<a name="line-30"></a><a name="Reviewable"></a><span class='hs-keyword'>class</span> <span class='hs-layout'>(</span><span class='hs-conid'>Profunctor</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>Bifunctor</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Reviewable</span> <span class='hs-varid'>p</span>
<a name="line-31"></a><a name="instance%20Reviewable%20p"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Profunctor</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>Bifunctor</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Reviewable</span> <span class='hs-varid'>p</span>
<a name="line-32"></a>
<a name="line-33"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-34"></a><span class='hs-comment'>-- Review: Reviewed</span>
<a name="line-35"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-36"></a>
<a name="line-37"></a><a name="retagged"></a><span class='hs-comment'>-- | This is a profunctor used internally to implement "Review"</span>
<a name="line-38"></a><span class='hs-comment'>--</span>
<a name="line-39"></a><span class='hs-comment'>-- It plays a role similar to that of 'Control.Lens.Internal.Getter.Accessor'</span>
<a name="line-40"></a><span class='hs-comment'>-- or 'Const' do for "Control.Lens.Getter"</span>
<a name="line-41"></a><span class='hs-definition'>retagged</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Profunctor</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>Bifunctor</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>p</span> <span class='hs-varid'>s</span> <span class='hs-varid'>b</span>
<a name="line-42"></a><span class='hs-definition'>retagged</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>first</span> <span class='hs-varid'>absurd</span> <span class='hs-varop'>.</span> <span class='hs-varid'>lmap</span> <span class='hs-varid'>absurd</span>
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