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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE TypeFamilies #-}</span>
<a name="line-2"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Invert</span>
<a name="line-3"></a> <span class='hs-layout'>(</span> <span class='hs-comment'>-- * Typeclass</span>
<a name="line-4"></a> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-5"></a> <span class='hs-comment'>-- * Exceptions</span>
<a name="line-6"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>finally</span>
<a name="line-7"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>catch</span>
<a name="line-8"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>block</span>
<a name="line-9"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unblock</span>
<a name="line-10"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>bracket</span>
<a name="line-11"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>bracket_</span>
<a name="line-12"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>onException</span>
<a name="line-13"></a> <span class='hs-comment'>-- * Memory allocation</span>
<a name="line-14"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>alloca</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>allocaBytes</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>withForeignPtr</span>
<a name="line-17"></a> <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'>Prelude</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>catch</span><span class='hs-layout'>)</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'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Identity</span>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Reader</span>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Writer</span>
<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'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-varid'>liftM</span><span class='hs-layout'>)</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>E</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'>Monoid</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span><span class='hs-layout'>)</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Marshal</span><span class='hs-varop'>.</span><span class='hs-conid'>Alloc</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>A</span>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Storable</span> <span class='hs-layout'>(</span><span class='hs-conid'>Storable</span><span class='hs-layout'>)</span>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ptr</span><span class='hs-layout'>)</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>ForeignPtr</span> <span class='hs-layout'>(</span><span class='hs-conid'>ForeignPtr</span><span class='hs-layout'>)</span>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>ForeignPtr</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>F</span>
<a name="line-33"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadIO</span><span class='hs-layout'>)</span>
<a name="line-34"></a>
<a name="line-35"></a><a name="MonadInvertIO"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>where</span>
<a name="line-36"></a> <span class='hs-keyword'>data</span> <span class='hs-conid'>InvertedIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>*</span> <span class='hs-keyglyph'>-></span> <span class='hs-varop'>*</span>
<a name="line-37"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>InvertedArg</span> <span class='hs-varid'>m</span>
<a name="line-38"></a> <span class='hs-varid'>invertIO</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>InvertedArg</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>InvertedIO</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-39"></a> <span class='hs-varid'>revertIO</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>InvertedArg</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>InvertedIO</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-40"></a>
<a name="line-41"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-42"></a> <span class='hs-keyword'>newtype</span> <span class='hs-conid'>InvertedIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-43"></a> <span class='hs-conid'>InvIdentIO</span> <span class='hs-layout'>{</span> <span class='hs-varid'>runInvIdentIO</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>InvertedIO</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-layout'>}</span>
<a name="line-44"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>InvertedArg</span> <span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>InvertedArg</span> <span class='hs-varid'>m</span>
<a name="line-45"></a> <span class='hs-varid'>invertIO</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-conid'>InvIdentIO</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>invertIO</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runIdentityT</span>
<a name="line-46"></a> <span class='hs-varid'>revertIO</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IdentityT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>revertIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>liftM</span> <span class='hs-varid'>runInvIdentIO</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span>
<a name="line-47"></a>
<a name="line-48"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Error</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>ErrorT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-49"></a> <span class='hs-keyword'>newtype</span> <span class='hs-conid'>InvertedIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>ErrorT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-50"></a> <span class='hs-conid'>InvErrorIO</span> <span class='hs-layout'>{</span> <span class='hs-varid'>runInvErrorIO</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>InvertedIO</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-varid'>e</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-keyword'>type</span> <span class='hs-conid'>InvertedArg</span> <span class='hs-layout'>(</span><span class='hs-conid'>ErrorT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>InvertedArg</span> <span class='hs-varid'>m</span>
<a name="line-52"></a> <span class='hs-varid'>invertIO</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-conid'>InvErrorIO</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>invertIO</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runErrorT</span>
<a name="line-53"></a> <span class='hs-varid'>revertIO</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ErrorT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>revertIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>liftM</span> <span class='hs-varid'>runInvErrorIO</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span>
<a name="line-54"></a>
<a name="line-55"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>r</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-56"></a> <span class='hs-keyword'>newtype</span> <span class='hs-conid'>InvertedIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>r</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-57"></a> <span class='hs-conid'>InvReaderIO</span> <span class='hs-layout'>{</span> <span class='hs-varid'>runInvReaderIO</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>InvertedIO</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-layout'>}</span>
<a name="line-58"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>InvertedArg</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>r</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-conid'>InvertedArg</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-59"></a> <span class='hs-varid'>invertIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>arg</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>InvReaderIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>invertIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>arg</span>
<a name="line-60"></a> <span class='hs-varid'>revertIO</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ReaderT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>revertIO</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>liftM</span> <span class='hs-varid'>runInvReaderIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-61"></a>
<a name="line-62"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-63"></a> <span class='hs-keyword'>newtype</span> <span class='hs-conid'>InvertedIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-64"></a> <span class='hs-conid'>InvWriterIO</span> <span class='hs-layout'>{</span> <span class='hs-varid'>runInvWriterIO</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>InvertedIO</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-65"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>InvertedArg</span> <span class='hs-layout'>(</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>InvertedArg</span> <span class='hs-varid'>m</span>
<a name="line-66"></a> <span class='hs-varid'>invertIO</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-conid'>InvWriterIO</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>invertIO</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runWriterT</span>
<a name="line-67"></a> <span class='hs-varid'>revertIO</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>WriterT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>revertIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>liftM</span> <span class='hs-varid'>runInvWriterIO</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span>
<a name="line-68"></a>
<a name="line-69"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-70"></a> <span class='hs-keyword'>newtype</span> <span class='hs-conid'>InvertedIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-71"></a> <span class='hs-conid'>InvStateIO</span> <span class='hs-layout'>{</span> <span class='hs-varid'>runInvStateIO</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>InvertedIO</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-72"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>InvertedArg</span> <span class='hs-layout'>(</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-conid'>InvertedArg</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-73"></a> <span class='hs-varid'>invertIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>arg</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>InvStateIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>invertIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>arg</span>
<a name="line-74"></a> <span class='hs-varid'>revertIO</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StateT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>revertIO</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>liftM</span> <span class='hs-varid'>runInvStateIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-75"></a>
<a name="line-76"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-conid'>IO</span> <span class='hs-keyword'>where</span>
<a name="line-77"></a> <span class='hs-keyword'>newtype</span> <span class='hs-conid'>InvertedIO</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>InvIO</span> <span class='hs-layout'>{</span> <span class='hs-varid'>runInvIO</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-layout'>}</span>
<a name="line-78"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>InvertedArg</span> <span class='hs-conid'>IO</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>()</span>
<a name="line-79"></a> <span class='hs-varid'>invertIO</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>const</span> <span class='hs-varop'>.</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>InvIO</span>
<a name="line-80"></a> <span class='hs-varid'>revertIO</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM</span> <span class='hs-varid'>runInvIO</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varop'>$</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-81"></a>
<a name="line-82"></a><a name="finally"></a><span class='hs-definition'>finally</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-83"></a><span class='hs-definition'>finally</span> <span class='hs-varid'>action</span> <span class='hs-varid'>after</span> <span class='hs-keyglyph'>=</span>
<a name="line-84"></a> <span class='hs-varid'>revertIO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>invertIO</span> <span class='hs-varid'>action</span> <span class='hs-varid'>a</span> <span class='hs-varop'>`</span><span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>finally</span><span class='hs-varop'>`</span> <span class='hs-varid'>invertIO</span> <span class='hs-varid'>after</span> <span class='hs-varid'>a</span>
<a name="line-85"></a>
<a name="line-86"></a><a name="onException"></a><span class='hs-definition'>onException</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-87"></a><span class='hs-definition'>onException</span> <span class='hs-varid'>action</span> <span class='hs-varid'>after</span> <span class='hs-keyglyph'>=</span>
<a name="line-88"></a> <span class='hs-varid'>revertIO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>invertIO</span> <span class='hs-varid'>action</span> <span class='hs-varid'>a</span> <span class='hs-varop'>`</span><span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>onException</span><span class='hs-varop'>`</span> <span class='hs-varid'>invertIO</span> <span class='hs-varid'>after</span> <span class='hs-varid'>a</span>
<a name="line-89"></a>
<a name="line-90"></a><a name="catch"></a><span class='hs-definition'>catch</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-91"></a><span class='hs-definition'>catch</span> <span class='hs-varid'>action</span> <span class='hs-varid'>handler</span> <span class='hs-keyglyph'>=</span>
<a name="line-92"></a> <span class='hs-varid'>revertIO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>invertIO</span> <span class='hs-varid'>action</span> <span class='hs-varid'>a</span> <span class='hs-varop'>`</span><span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>catch</span><span class='hs-varop'>`</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>invertIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>handler</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-93"></a>
<a name="line-94"></a><a name="block"></a><span class='hs-definition'>block</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-95"></a><span class='hs-definition'>block</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>revertIO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>block</span> <span class='hs-varop'>$</span> <span class='hs-varid'>invertIO</span> <span class='hs-varid'>action</span> <span class='hs-varid'>a</span>
<a name="line-96"></a>
<a name="line-97"></a><a name="unblock"></a><span class='hs-definition'>unblock</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-98"></a><span class='hs-definition'>unblock</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>revertIO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>unblock</span> <span class='hs-varop'>$</span> <span class='hs-varid'>invertIO</span> <span class='hs-varid'>action</span> <span class='hs-varid'>a</span>
<a name="line-99"></a>
<a name="line-100"></a><a name="bracket"></a><span class='hs-comment'>-- | There is a very important distinction between this function and</span>
<a name="line-101"></a><span class='hs-comment'>-- 'bracket_': in this version, the monadic side effects from the</span>
<a name="line-102"></a><span class='hs-comment'>-- initialization function and kept, while in bracket_ they are discarded.</span>
<a name="line-103"></a><span class='hs-definition'>bracket</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-varid'>m</span>
<a name="line-104"></a> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-105"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-106"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-107"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span>
<a name="line-108"></a><span class='hs-definition'>bracket</span> <span class='hs-varid'>acquire</span> <span class='hs-varid'>cleanup</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>revertIO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>bracket</span>
<a name="line-109"></a> <span class='hs-layout'>(</span><span class='hs-varid'>invertIO</span> <span class='hs-varid'>acquire</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-110"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>invertIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>revertIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-varop'>$</span> <span class='hs-varid'>return</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>cleanup</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-111"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>invertIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>revertIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-varop'>$</span> <span class='hs-varid'>return</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>action</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-112"></a>
<a name="line-113"></a><a name="bracket_"></a><span class='hs-comment'>-- | See 'bracket'.</span>
<a name="line-114"></a><span class='hs-definition'>bracket_</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span>
<a name="line-115"></a><span class='hs-definition'>bracket_</span> <span class='hs-varid'>acquire</span> <span class='hs-varid'>cleanup</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>revertIO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>bracket_</span>
<a name="line-116"></a> <span class='hs-layout'>(</span><span class='hs-varid'>invertIO</span> <span class='hs-varid'>acquire</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-117"></a> <span class='hs-layout'>(</span><span class='hs-varid'>invertIO</span> <span class='hs-varid'>cleanup</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-118"></a> <span class='hs-layout'>(</span><span class='hs-varid'>invertIO</span> <span class='hs-varid'>action</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-119"></a>
<a name="line-120"></a><a name="alloca"></a><span class='hs-definition'>alloca</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Storable</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-conid'>Ptr</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span>
<a name="line-121"></a><span class='hs-definition'>alloca</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>revertIO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>alloca</span> <span class='hs-varop'>$</span> <span class='hs-varid'>flip</span> <span class='hs-varid'>invertIO</span> <span class='hs-varid'>x</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span>
<a name="line-122"></a>
<a name="line-123"></a><a name="allocaBytes"></a><span class='hs-definition'>allocaBytes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Ptr</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span>
<a name="line-124"></a><span class='hs-definition'>allocaBytes</span> <span class='hs-varid'>i</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>revertIO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>allocaBytes</span> <span class='hs-varid'>i</span> <span class='hs-varop'>$</span> <span class='hs-varid'>flip</span> <span class='hs-varid'>invertIO</span> <span class='hs-varid'>x</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span>
<a name="line-125"></a>
<a name="line-126"></a><a name="withForeignPtr"></a><span class='hs-definition'>withForeignPtr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadInvertIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ForeignPtr</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Ptr</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span>
<a name="line-127"></a><span class='hs-definition'>withForeignPtr</span> <span class='hs-varid'>p</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span>
<a name="line-128"></a> <span class='hs-varid'>revertIO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>F</span><span class='hs-varop'>.</span><span class='hs-varid'>withForeignPtr</span> <span class='hs-varid'>p</span> <span class='hs-varop'>$</span> <span class='hs-varid'>flip</span> <span class='hs-varid'>invertIO</span> <span class='hs-varid'>x</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span>
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