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<title>Control/Exception/IOChoice.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE ScopedTypeVariables #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- This package provides the choice operator ('||>') for</span>
<a name="line-5"></a><span class='hs-comment'>-- IO monad.</span>
<a name="line-6"></a>
<a name="line-7"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span><span class='hs-varop'>.</span><span class='hs-conid'>IOChoice</span> <span class='hs-keyword'>where</span>
<a name="line-8"></a>
<a name="line-9"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-layout'>(</span><span class='hs-conid'>IOException</span><span class='hs-layout'>)</span>
<a name="line-10"></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-11"></a>
<a name="line-12"></a><span class='hs-comment'>-- |</span>
<a name="line-13"></a><span class='hs-comment'>-- If 'IOException' occurs or 'goNext' is used in the left IO,</span>
<a name="line-14"></a><span class='hs-comment'>-- then the right IO is performed. Note that 'fail'</span>
<a name="line-15"></a><span class='hs-comment'>-- throws 'IOException'.</span>
<a name="line-16"></a>
<a name="line-17"></a><a name="%7c%7c%3e"></a><span class='hs-layout'>(</span><span class='hs-varop'>||></span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-18"></a><a name="x"></a><span class='hs-definition'>x</span> <span class='hs-varop'>||></span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</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-layout'>(</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IOException</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-19"></a>
<a name="line-20"></a><span class='hs-keyword'>infixr</span> <span class='hs-num'>3</span> <span class='hs-varop'>||></span>
<a name="line-21"></a>
<a name="line-22"></a><a name="goNext"></a><span class='hs-comment'>-- | Go to the next 'IO' monad by throwing 'IOException'.</span>
<a name="line-23"></a><span class='hs-definition'>goNext</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-24"></a><span class='hs-definition'>goNext</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>throwIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>userError</span> <span class='hs-str'>"goNext for IO"</span>
<a name="line-25"></a>
<a name="line-26"></a><a name="runAnyOne"></a><span class='hs-comment'>-- | Run any one 'IO' monad.</span>
<a name="line-27"></a><span class='hs-definition'>runAnyOne</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-28"></a><span class='hs-definition'>runAnyOne</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-varop'>||></span><span class='hs-layout'>)</span> <span class='hs-varid'>goNext</span>
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