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<title>Data/ConcreteTypeRep.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE DeriveDataTypeable, GeneralizedNewtypeDeriving, CPP #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>{- |
<a name="line-4"></a>This module defines 'Binary' and 'Hashable' instances for 'TypeRep'. These are defined on a newtype of 'TypeRep', namely 'ConcreteTypeRep', for two purposes:
<a name="line-5"></a>
<a name="line-6"></a> * to avoid making orphan instances
<a name="line-7"></a>
<a name="line-8"></a> * the 'Hashable' instance for 'ConcreteTypeRep' may not be pure enough for some people's tastes.
<a name="line-9"></a>
<a name="line-10"></a>As usual with 'Typeable', this module will typically be used with some variant of @Data.Dynamic@. Two possible uses of this module are:
<a name="line-11"></a>
<a name="line-12"></a> * making hashmaps: @HashMap 'ConcreteTypeRep' Dynamic@
<a name="line-13"></a>
<a name="line-14"></a> * serializing @Dynamic@s.
<a name="line-15"></a>
<a name="line-16"></a>-}</span>
<a name="line-17"></a>
<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'>ConcreteTypeRep</span> <span class='hs-layout'>(</span>
<a name="line-19"></a> <span class='hs-conid'>ConcreteTypeRep</span><span class='hs-layout'>,</span>
<a name="line-20"></a> <span class='hs-varid'>cTypeOf</span><span class='hs-layout'>,</span>
<a name="line-21"></a> <span class='hs-varid'>toTypeRep</span><span class='hs-layout'>,</span>
<a name="line-22"></a> <span class='hs-varid'>fromTypeRep</span><span class='hs-layout'>,</span>
<a name="line-23"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-24"></a>
<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'>Typeable</span>
<a name="line-26"></a><span class='hs-cpp'>#ifdef NEW_TYPEREP</span>
<a name="line-27"></a><span class='hs-keyword'>import</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'>Internal</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Fingerprint</span><span class='hs-varop'>.</span><span class='hs-conid'>Type</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-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Hashable</span>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Binary</span>
<a name="line-33"></a>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span>
<a name="line-35"></a>
<a name="line-36"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'><$></span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-37"></a>
<a name="line-38"></a><a name="ConcreteTypeRep"></a><span class='hs-comment'>-- | Abstract type providing the functionality of 'TypeRep', but additionally supporting hashing and serialization.</span>
<a name="line-39"></a><a name="ConcreteTypeRep"></a><span class='hs-comment'>--</span>
<a name="line-40"></a><a name="ConcreteTypeRep"></a><span class='hs-comment'>-- The 'Eq' instance is just the 'Eq' instance for 'TypeRep', so an analogous guarantee holds: @'cTypeOf' a == 'cTypeOf' b@ if and only if @a@ and @b@ have the same type.</span>
<a name="line-41"></a><a name="ConcreteTypeRep"></a><span class='hs-comment'>-- The hashing and serialization functions preserve this equality.</span>
<a name="line-42"></a><a name="ConcreteTypeRep"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>ConcreteTypeRep</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CTR</span> <span class='hs-layout'>{</span> <span class='hs-varid'>unCTR</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TypeRep</span> <span class='hs-layout'>}</span> <span class='hs-keyword'>deriving</span><span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-43"></a>
<a name="line-44"></a><a name="cTypeOf"></a><span class='hs-comment'>-- | \"Concrete\" version of 'typeOf'.</span>
<a name="line-45"></a><span class='hs-definition'>cTypeOf</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Typeable</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ConcreteTypeRep</span>
<a name="line-46"></a><span class='hs-definition'>cTypeOf</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromTypeRep</span> <span class='hs-varop'>.</span> <span class='hs-varid'>typeOf</span>
<a name="line-47"></a>
<a name="line-48"></a><a name="toTypeRep"></a><span class='hs-comment'>-- | Converts to the underlying 'TypeRep'</span>
<a name="line-49"></a><span class='hs-definition'>toTypeRep</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ConcreteTypeRep</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TypeRep</span>
<a name="line-50"></a><span class='hs-definition'>toTypeRep</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unCTR</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="fromTypeRep"></a><span class='hs-comment'>-- | Converts from the underlying 'TypeRep'</span>
<a name="line-53"></a><span class='hs-definition'>fromTypeRep</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TypeRep</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ConcreteTypeRep</span>
<a name="line-54"></a><span class='hs-definition'>fromTypeRep</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CTR</span>
<a name="line-55"></a>
<a name="line-56"></a><a name="instance%20Show%20ConcreteTypeRep"></a><span class='hs-comment'>-- show as a normal TypeRep</span>
<a name="line-57"></a><a name="instance%20Show%20ConcreteTypeRep"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Show</span> <span class='hs-conid'>ConcreteTypeRep</span> <span class='hs-keyword'>where</span>
<a name="line-58"></a> <span class='hs-varid'>showsPrec</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showsPrec</span> <span class='hs-varid'>i</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unCTR</span>
<a name="line-59"></a>
<a name="line-60"></a>
<a name="line-61"></a><a name="instance%20Hashable%20ConcreteTypeRep"></a><span class='hs-comment'>-- | This instance is guaranteed to be consistent for a single run of the program, but not for multiple runs.</span>
<a name="line-62"></a><a name="instance%20Hashable%20ConcreteTypeRep"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Hashable</span> <span class='hs-conid'>ConcreteTypeRep</span> <span class='hs-keyword'>where</span>
<a name="line-63"></a><span class='hs-cpp'>#ifdef NEW_TYPEREP</span>
<a name="line-64"></a> <span class='hs-varid'>hashWithSalt</span> <span class='hs-varid'>salt</span> <span class='hs-layout'>(</span><span class='hs-conid'>CTR</span> <span class='hs-layout'>(</span><span class='hs-conid'>TypeRep</span> <span class='hs-layout'>(</span><span class='hs-conid'>Fingerprint</span> <span class='hs-varid'>w1</span> <span class='hs-varid'>w2</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>salt</span> <span class='hs-varop'>`hashWithSalt`</span> <span class='hs-varid'>w1</span> <span class='hs-varop'>`hashWithSalt`</span> <span class='hs-varid'>w2</span>
<a name="line-65"></a><span class='hs-cpp'>#else</span>
<a name="line-66"></a> <span class='hs-varid'>hashWithSalt</span> <span class='hs-varid'>salt</span> <span class='hs-varid'>ctr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hashWithSalt</span> <span class='hs-varid'>salt</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafePerformIO</span> <span class='hs-varop'>.</span> <span class='hs-varid'>typeRepKey</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toTypeRep</span> <span class='hs-varop'>$</span> <span class='hs-varid'>ctr</span><span class='hs-layout'>)</span>
<a name="line-67"></a><span class='hs-cpp'>#endif</span>
<a name="line-68"></a>
<a name="line-69"></a><a name="toTyConRep"></a><span class='hs-comment'>------------- serialization: this uses Gökhan San's construction, from</span>
<a name="line-70"></a><span class='hs-comment'>---- <a href="http://www.mail-archive.com/haskell-cafe@haskell.org/msg41134.html">http://www.mail-archive.com/haskell-cafe@haskell.org/msg41134.html</a></span>
<a name="line-71"></a><span class='hs-definition'>toTyConRep</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TyCon</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TyConRep</span>
<a name="line-72"></a><a name="fromTyConRep"></a><span class='hs-definition'>fromTyConRep</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TyConRep</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TyCon</span>
<a name="line-73"></a><span class='hs-cpp'>#ifdef NEW_TYPEREP</span>
<a name="line-74"></a><a name="TyConRep"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>TyConRep</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span>
<a name="line-75"></a><span class='hs-definition'>toTyConRep</span> <span class='hs-layout'>(</span><span class='hs-conid'>TyCon</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>pack</span> <span class='hs-varid'>mod</span> <span class='hs-varid'>name</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>pack</span><span class='hs-layout'>,</span> <span class='hs-varid'>mod</span><span class='hs-layout'>,</span> <span class='hs-varid'>name</span><span class='hs-layout'>)</span>
<a name="line-76"></a><span class='hs-definition'>fromTyConRep</span> <span class='hs-layout'>(</span><span class='hs-varid'>pack</span><span class='hs-layout'>,</span> <span class='hs-varid'>mod</span><span class='hs-layout'>,</span> <span class='hs-varid'>name</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkTyCon3</span> <span class='hs-varid'>pack</span> <span class='hs-varid'>mod</span> <span class='hs-varid'>name</span>
<a name="line-77"></a><span class='hs-cpp'>#else</span>
<a name="line-78"></a><a name="TyConRep"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>TyConRep</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>String</span>
<a name="line-79"></a><span class='hs-definition'>toTyConRep</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tyConString</span>
<a name="line-80"></a><span class='hs-definition'>fromTyConRep</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkTyCon</span>
<a name="line-81"></a><span class='hs-cpp'>#endif</span>
<a name="line-82"></a>
<a name="line-83"></a><a name="SerialRep"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>SerialRep</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SR</span> <span class='hs-layout'>(</span><span class='hs-conid'>TyConRep</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>SerialRep</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-keyword'>deriving</span><span class='hs-layout'>(</span><span class='hs-conid'>Binary</span><span class='hs-layout'>)</span>
<a name="line-84"></a>
<a name="line-85"></a><a name="toSerial"></a><span class='hs-definition'>toSerial</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ConcreteTypeRep</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SerialRep</span>
<a name="line-86"></a><span class='hs-definition'>toSerial</span> <span class='hs-layout'>(</span><span class='hs-conid'>CTR</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-87"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>splitTyConApp</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>of</span>
<a name="line-88"></a> <span class='hs-layout'>(</span><span class='hs-varid'>con</span><span class='hs-layout'>,</span> <span class='hs-varid'>args</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SR</span> <span class='hs-layout'>(</span><span class='hs-varid'>toTyConRep</span> <span class='hs-varid'>con</span><span class='hs-layout'>,</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>toSerial</span> <span class='hs-varop'>.</span> <span class='hs-conid'>CTR</span><span class='hs-layout'>)</span> <span class='hs-varid'>args</span><span class='hs-layout'>)</span>
<a name="line-89"></a>
<a name="line-90"></a><a name="fromSerial"></a><span class='hs-definition'>fromSerial</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SerialRep</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ConcreteTypeRep</span>
<a name="line-91"></a><span class='hs-definition'>fromSerial</span> <span class='hs-layout'>(</span><span class='hs-conid'>SR</span> <span class='hs-layout'>(</span><span class='hs-varid'>con</span><span class='hs-layout'>,</span> <span class='hs-varid'>args</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CTR</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mkTyConApp</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromTyConRep</span> <span class='hs-varid'>con</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>unCTR</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fromSerial</span><span class='hs-layout'>)</span> <span class='hs-varid'>args</span><span class='hs-layout'>)</span>
<a name="line-92"></a>
<a name="line-93"></a><a name="instance%20Binary%20ConcreteTypeRep"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Binary</span> <span class='hs-conid'>ConcreteTypeRep</span> <span class='hs-keyword'>where</span>
<a name="line-94"></a> <span class='hs-varid'>put</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>put</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toSerial</span>
<a name="line-95"></a> <span class='hs-varid'>get</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromSerial</span> <span class='hs-varop'><$></span> <span class='hs-varid'>get</span>
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