<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <!-- Generated by HsColour, http://www.cs.york.ac.uk/fp/darcs/hscolour/ --> <title>Lava/MyST.hs</title> <link type='text/css' rel='stylesheet' href='hscolour.css' /> </head> <body> <pre><a name="line-1"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Lava</span><span class='hs-varop'>.</span><span class='hs-conid'>MyST</span> <a name="line-2"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>ST</span> <a name="line-3"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>STRef</span> <a name="line-4"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>newSTRef</span> <a name="line-5"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>readSTRef</span> <a name="line-6"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>writeSTRef</span> <a name="line-7"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>runST</span> <a name="line-8"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>fixST</span> <a name="line-9"></a> <a name="line-10"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unsafePerformST</span> <a name="line-11"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unsafeInterleaveST</span> <a name="line-12"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unsafeIOtoST</span> <a name="line-13"></a> <span class='hs-layout'>)</span> <a name="line-14"></a> <span class='hs-keyword'>where</span> <a name="line-15"></a> <a name="line-16"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span> <a name="line-17"></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-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span> <a name="line-19"></a> <a name="line-20"></a><a name="ST"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <a name="line-21"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ST</span> <span class='hs-layout'>(</span><span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <a name="line-22"></a> <a name="line-23"></a><a name="unST"></a><span class='hs-definition'>unST</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</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-24"></a><span class='hs-definition'>unST</span> <span class='hs-layout'>(</span><span class='hs-conid'>ST</span> <span class='hs-varid'>io</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>io</span> <a name="line-25"></a> <a name="line-26"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Functor</span> <span class='hs-layout'>(</span><span class='hs-conid'>ST</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <a name="line-27"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>ST</span> <span class='hs-varid'>io</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ST</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-varid'>io</span><span class='hs-layout'>)</span> <a name="line-28"></a> <a name="line-29"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-conid'>ST</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <a name="line-30"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ST</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <a name="line-31"></a> <span class='hs-conid'>ST</span> <span class='hs-varid'>io</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ST</span> <span class='hs-layout'>(</span><span class='hs-keyword'>do</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>io</span> <span class='hs-layout'>;</span> <span class='hs-varid'>unST</span> <span class='hs-layout'>(</span><span class='hs-varid'>k</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-32"></a> <a name="line-33"></a><a name="STRef"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>STRef</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <a name="line-34"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>STRef</span> <span class='hs-layout'>(</span><span class='hs-conid'>IORef</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <a name="line-35"></a> <a name="line-36"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-layout'>(</span><span class='hs-conid'>STRef</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <a name="line-37"></a> <span class='hs-conid'>STRef</span> <span class='hs-varid'>r1</span> <span class='hs-varop'>==</span> <span class='hs-conid'>STRef</span> <span class='hs-varid'>r2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>r1</span> <span class='hs-varop'>==</span> <span class='hs-varid'>r2</span> <a name="line-38"></a> <a name="line-39"></a><a name="newSTRef"></a><span class='hs-definition'>newSTRef</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-conid'>STRef</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <a name="line-40"></a><span class='hs-definition'>newSTRef</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ST</span> <span class='hs-layout'>(</span><span class='hs-conid'>STRef</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>newIORef</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <a name="line-41"></a> <a name="line-42"></a><a name="readSTRef"></a><span class='hs-definition'>readSTRef</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>STRef</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <a name="line-43"></a><span class='hs-definition'>readSTRef</span> <span class='hs-layout'>(</span><span class='hs-conid'>STRef</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ST</span> <span class='hs-layout'>(</span><span class='hs-varid'>readIORef</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <a name="line-44"></a> <a name="line-45"></a><a name="writeSTRef"></a><span class='hs-definition'>writeSTRef</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>STRef</span> <span class='hs-varid'>s</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'>ST</span> <span class='hs-varid'>s</span> <span class='hs-conid'>()</span> <a name="line-46"></a><span class='hs-definition'>writeSTRef</span> <span class='hs-layout'>(</span><span class='hs-conid'>STRef</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ST</span> <span class='hs-layout'>(</span><span class='hs-varid'>writeIORef</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <a name="line-47"></a> <a name="line-48"></a><a name="runST"></a><span class='hs-definition'>runST</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>s</span> <span class='hs-varop'>.</span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <a name="line-49"></a><span class='hs-definition'>runST</span> <span class='hs-varid'>st</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafePerformST</span> <span class='hs-varid'>st</span> <a name="line-50"></a> <a name="line-51"></a><a name="fixST"></a><span class='hs-definition'>fixST</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <a name="line-52"></a><span class='hs-definition'>fixST</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ST</span> <span class='hs-layout'>(</span><span class='hs-varid'>fixIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>unST</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-53"></a> <a name="line-54"></a><a name="unsafePerformST"></a><span class='hs-definition'>unsafePerformST</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <a name="line-55"></a><span class='hs-definition'>unsafePerformST</span> <span class='hs-layout'>(</span><span class='hs-conid'>ST</span> <span class='hs-varid'>io</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafePerformIO</span> <span class='hs-varid'>io</span> <a name="line-56"></a> <a name="line-57"></a><a name="unsafeInterleaveST"></a><span class='hs-definition'>unsafeInterleaveST</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <a name="line-58"></a><span class='hs-definition'>unsafeInterleaveST</span> <span class='hs-layout'>(</span><span class='hs-conid'>ST</span> <span class='hs-varid'>io</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ST</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeInterleaveIO</span> <span class='hs-varid'>io</span><span class='hs-layout'>)</span> <a name="line-59"></a> <a name="line-60"></a><a name="unsafeIOtoST"></a><span class='hs-definition'>unsafeIOtoST</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'>ST</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <a name="line-61"></a><span class='hs-definition'>unsafeIOtoST</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ST</span> <a name="line-62"></a> </pre></body> </html>
