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<title>src/Control/Lens/Internal/Coerce.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 708</span>
<a name="line-4"></a><span class='hs-cpp'>#define USE_COERCE</span>
<a name="line-5"></a><span class='hs-comment'>{-# LANGUAGE Trustworthy #-}</span>
<a name="line-6"></a><span class='hs-comment'>{-# LANGUAGE RankNTypes #-}</span>
<a name="line-7"></a><span class='hs-comment'>{-# LANGUAGE ScopedTypeVariables #-}</span>
<a name="line-8"></a><span class='hs-cpp'>#else</span>
<a name="line-9"></a><span class='hs-comment'>{-# LANGUAGE Unsafe #-}</span>
<a name="line-10"></a><span class='hs-cpp'>#endif</span>
<a name="line-11"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-12"></a><span class='hs-comment'>-- |</span>
<a name="line-13"></a><span class='hs-comment'>-- Copyright : (C) 2016 Edward Kmett and Eric Mertens</span>
<a name="line-14"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</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</span>
<a name="line-18"></a><span class='hs-comment'>--</span>
<a name="line-19"></a><span class='hs-comment'>-- This module provides a shim around 'coerce' that defaults to 'unsafeCoerce'</span>
<a name="line-20"></a><span class='hs-comment'>-- on GHC < 7.8</span>
<a name="line-21"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-22"></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'>Coerce</span>
<a name="line-23"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>coerce</span>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>coerce'</span>
<a name="line-25"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-26"></a>
<a name="line-27"></a><span class='hs-cpp'>#ifdef USE_COERCE</span>
<a name="line-28"></a>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Coerce</span>
<a name="line-30"></a>
<a name="line-31"></a><a name="coerce'"></a><span class='hs-definition'>coerce'</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-varop'>.</span> <span class='hs-conid'>Coercible</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-32"></a><span class='hs-definition'>coerce'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>coerce</span> <span class='hs-layout'>(</span><span class='hs-varid'>id</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-33"></a><span class='hs-comment'>{-# INLINE coerce' #-}</span>
<a name="line-34"></a>
<a name="line-35"></a><span class='hs-cpp'>#else</span>
<a name="line-36"></a>
<a name="line-37"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Unsafe</span><span class='hs-varop'>.</span><span class='hs-conid'>Coerce</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="coerce"></a><span class='hs-definition'>coerce</span><span class='hs-layout'>,</span> <span class='hs-varid'>coerce'</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-40"></a><span class='hs-definition'>coerce</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafeCoerce</span>
<a name="line-41"></a><span class='hs-definition'>coerce'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafeCoerce</span>
<a name="line-42"></a><span class='hs-comment'>{-# INLINE coerce #-}</span>
<a name="line-43"></a><span class='hs-comment'>{-# INLINE coerce' #-}</span>
<a name="line-44"></a><span class='hs-cpp'>#endif</span>
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