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<title>src/Data/Semigroupoid/Dual.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-cpp'>#if __GLASGOW_HASKELL__ >= 706</span>
<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE PolyKinds #-}</span>
<a name="line-4"></a><span class='hs-cpp'>#endif</span>
<a name="line-5"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-6"></a><span class='hs-comment'>-- |</span>
<a name="line-7"></a><span class='hs-comment'>-- Copyright : (C) 2007-2015 Edward Kmett</span>
<a name="line-8"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-9"></a><span class='hs-comment'>--</span>
<a name="line-10"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-11"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-12"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-- A semigroupoid satisfies all of the requirements to be a Category except</span>
<a name="line-15"></a><span class='hs-comment'>-- for the existence of identity arrows.</span>
<a name="line-16"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-17"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Semigroupoid</span><span class='hs-varop'>.</span><span class='hs-conid'>Dual</span> <span class='hs-layout'>(</span><span class='hs-conid'>Dual</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Semigroupoid</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Category</span>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span> <span class='hs-conid'>()</span>
<a name="line-22"></a>
<a name="line-23"></a><a name="Dual"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>Dual</span> <span class='hs-varid'>k</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Dual</span> <span class='hs-layout'>{</span> <span class='hs-varid'>getDual</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>k</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span> <span class='hs-layout'>}</span>
<a name="line-24"></a>
<a name="line-25"></a><a name="instance%20Semigroupoid%20(Dual%20k)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Semigroupoid</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Semigroupoid</span> <span class='hs-layout'>(</span><span class='hs-conid'>Dual</span> <span class='hs-varid'>k</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-26"></a> <span class='hs-conid'>Dual</span> <span class='hs-varid'>f</span> <span class='hs-varop'>`o`</span> <span class='hs-conid'>Dual</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Dual</span> <span class='hs-layout'>(</span><span class='hs-varid'>g</span> <span class='hs-varop'>`o`</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-27"></a>
<a name="line-28"></a><a name="instance%20Category%20(Dual%20k)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Category</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Category</span> <span class='hs-layout'>(</span><span class='hs-conid'>Dual</span> <span class='hs-varid'>k</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-29"></a> <span class='hs-varid'>id</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Dual</span> <span class='hs-varid'>id</span>
<a name="line-30"></a> <span class='hs-conid'>Dual</span> <span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Dual</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Dual</span> <span class='hs-layout'>(</span><span class='hs-varid'>g</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
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