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<title>src/Data/Typeable/Lens.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 Rank2Types #-}</span>
<a name="line-3"></a>
<a name="line-4"></a><span class='hs-cpp'>#ifndef MIN_VERSION_base</span>
<a name="line-5"></a><span class='hs-cpp'>#define MIN_VERSION_base(x,y,z) 1</span>
<a name="line-6"></a><span class='hs-cpp'>#endif</span>
<a name="line-7"></a>
<a name="line-8"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-9"></a><span class='hs-comment'>-- |</span>
<a name="line-10"></a><span class='hs-comment'>-- Module : Data.Typeable.Lens</span>
<a name="line-11"></a><span class='hs-comment'>-- Copyright : (C) 2012-15 Edward Kmett</span>
<a name="line-12"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-13"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-14"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-15"></a><span class='hs-comment'>-- Portability : Rank2Types</span>
<a name="line-16"></a><span class='hs-comment'>--</span>
<a name="line-17"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-18"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Typeable</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-19"></a> <span class='hs-layout'>(</span> <span class='hs-sel'>_cast</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_gcast</span>
<a name="line-21"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-22"></a>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<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'>Typeable</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'>Maybe</span>
<a name="line-26"></a>
<a name="line-27"></a><span class='hs-cpp'>#if !MIN_VERSION_base(4,8,0)</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'>Applicative</span>
<a name="line-29"></a><span class='hs-cpp'>#endif</span>
<a name="line-30"></a>
<a name="line-31"></a><span class='hs-comment'>-- | A 'Traversal'' for working with a 'cast' of a 'Typeable' value.</span>
<a name="line-32"></a><span class='hs-sel'>_cast</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Typeable</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Traversal'</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span>
<a name="line-33"></a><span class='hs-sel'>_cast</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>cast</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-34"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fromMaybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>error</span> <span class='hs-str'>"_cast: recast failed"</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>cast</span> <span class='hs-varop'><$></span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span>
<a name="line-35"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>pure</span> <span class='hs-varid'>s</span>
<a name="line-36"></a><span class='hs-comment'>{-# INLINE _cast #-}</span>
<a name="line-37"></a>
<a name="line-38"></a><span class='hs-comment'>-- | A 'Traversal'' for working with a 'gcast' of a 'Typeable' value.</span>
<a name="line-39"></a><span class='hs-sel'>_gcast</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Typeable</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Traversal'</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-40"></a><span class='hs-sel'>_gcast</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>gcast</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-41"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fromMaybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>error</span> <span class='hs-str'>"_gcast: recast failed"</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>gcast</span> <span class='hs-varop'><$></span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span>
<a name="line-42"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>pure</span> <span class='hs-varid'>s</span>
<a name="line-43"></a><span class='hs-comment'>{-# INLINE _gcast #-}</span>
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