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<title>Data/Generics/SYB/WithClass/Context.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE UndecidableInstances, OverlappingInstances, EmptyDataDecls #-}</span>
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<a name="line-3"></a><span class='hs-comment'>{-
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<a name="line-5"></a>(C) 2004 Ralf Laemmel
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<a name="line-7"></a>Context parameterisation and context passing.
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<a name="line-9"></a>-}</span>
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<a name="line-12"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Generics</span><span class='hs-varop'>.</span><span class='hs-conid'>SYB</span><span class='hs-varop'>.</span><span class='hs-conid'>WithClass</span><span class='hs-varop'>.</span><span class='hs-conid'>Context</span>
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<a name="line-14"></a><span class='hs-keyword'>where</span>
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<a name="line-16"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
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<a name="line-18"></a><span class='hs-comment'>--</span>
<a name="line-19"></a><span class='hs-comment'>-- The Sat class from John Hughes' "Restricted Data Types in Haskell"</span>
<a name="line-20"></a><span class='hs-comment'>--</span>
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<a name="line-22"></a><a name="Sat"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Sat</span> <span class='hs-varid'>a</span>
<a name="line-23"></a> <span class='hs-keyword'>where</span>
<a name="line-24"></a> <span class='hs-varid'>dict</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span>
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<a name="line-26"></a>
<a name="line-27"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-28"></a>
<a name="line-29"></a><span class='hs-comment'>-- No context</span>
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<a name="line-31"></a><a name="NoCtx"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>NoCtx</span> <span class='hs-varid'>a</span>
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<a name="line-33"></a><a name="noCtx"></a><span class='hs-definition'>noCtx</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>NoCtx</span> <span class='hs-conid'>()</span>
<a name="line-34"></a><span class='hs-definition'>noCtx</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>undefined</span>
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<a name="line-36"></a><a name="instance%20Sat%20(NoCtx%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Sat</span> <span class='hs-layout'>(</span><span class='hs-conid'>NoCtx</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>dict</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>undefined</span>
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<a name="line-39"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
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<a name="line-41"></a><span class='hs-comment'>-- Pair context</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="PairCtx"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>PairCtx</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span>
<a name="line-44"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>PairCtx</span> <span class='hs-layout'>{</span> <span class='hs-varid'>leftCtx</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-45"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>rightCtx</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span> <span class='hs-layout'>}</span>
<a name="line-46"></a>
<a name="line-47"></a><a name="pairCtx"></a><span class='hs-definition'>pairCtx</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>l</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PairCtx</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span> <span class='hs-conid'>()</span>
<a name="line-48"></a><span class='hs-definition'>pairCtx</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>undefined</span>
<a name="line-49"></a>
<a name="line-50"></a><a name="instance%20Sat%20(PairCtx%20l%20r%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Sat</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Sat</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-51"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Sat</span> <span class='hs-layout'>(</span><span class='hs-conid'>PairCtx</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-52"></a> <span class='hs-keyword'>where</span>
<a name="line-53"></a> <span class='hs-varid'>dict</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>PairCtx</span> <span class='hs-layout'>{</span> <span class='hs-varid'>leftCtx</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dict</span>
<a name="line-54"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>rightCtx</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dict</span> <span class='hs-layout'>}</span>
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<a name="line-56"></a>
<a name="line-57"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
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