<?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>Data/Default.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'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Default</span> <span class='hs-layout'>(</span> <a name="line-2"></a><span class='hs-comment'>-- | This module defines a class for types with a default value. Instances are</span> <a name="line-3"></a><span class='hs-comment'>-- provided for '()', 'S.Set', 'M.Map', 'Int', 'Integer', 'Float', 'Double',</span> <a name="line-4"></a><span class='hs-comment'>-- and many others (see below).</span> <a name="line-5"></a> <span class='hs-conid'>Default</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <a name="line-6"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <a name="line-7"></a> <a name="line-8"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span> <a name="line-9"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Ratio</span> <a name="line-10"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Set</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>S</span> <a name="line-11"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>M</span> <a name="line-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>IntMap</span> <span class='hs-layout'>(</span><span class='hs-conid'>IntMap</span><span class='hs-layout'>)</span> <a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>IntSet</span> <span class='hs-layout'>(</span><span class='hs-conid'>IntSet</span><span class='hs-layout'>)</span> <a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Sequence</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span><span class='hs-layout'>)</span> <a name="line-15"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Tree</span> <span class='hs-layout'>(</span><span class='hs-conid'>Tree</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-16"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>DList</span> <span class='hs-layout'>(</span><span class='hs-conid'>DList</span><span class='hs-layout'>)</span> <a name="line-17"></a> <a name="line-18"></a><a name="Default"></a><span class='hs-comment'>-- | A class for types with a default value.</span> <a name="line-19"></a><a name="Default"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Default</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span> <a name="line-20"></a> <span class='hs-comment'>-- | The default value for this type.</span> <a name="line-21"></a> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <a name="line-22"></a> <a name="line-23"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-conid'>Set</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span> <a name="line-24"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-varid'>k</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span> <a name="line-25"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-conid'>IntMap</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mempty</span> <a name="line-26"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-conid'>IntSet</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mempty</span> <a name="line-27"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mempty</span> <a name="line-28"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Default</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-conid'>Tree</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Node</span> <span class='hs-varid'>def</span> <span class='hs-varid'>def</span> <a name="line-29"></a> <a name="line-30"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-conid'>Int</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span> <a name="line-31"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-conid'>Integer</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span> <a name="line-32"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-conid'>Float</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span> <a name="line-33"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-conid'>Double</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span> <a name="line-34"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ratio</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span> <a name="line-35"></a> <a name="line-36"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Default</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>const</span> <span class='hs-varid'>def</span> <a name="line-37"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Default</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varid'>def</span> <a name="line-38"></a> <a name="line-39"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span> <a name="line-40"></a> <a name="line-41"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-conid'>()</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mempty</span> <a name="line-42"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mempty</span> <a name="line-43"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-conid'>Ordering</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mempty</span> <a name="line-44"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-conid'>Any</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mempty</span> <a name="line-45"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-conid'>All</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mempty</span> <a name="line-46"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-conid'>Last</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mempty</span> <a name="line-47"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-conid'>First</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mempty</span> <a name="line-48"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Num</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-conid'>Sum</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mempty</span> <a name="line-49"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Num</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-conid'>Product</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mempty</span> <a name="line-50"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-conid'>Endo</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mempty</span> <a name="line-51"></a> <a name="line-52"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-conid'>DList</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mempty</span> <a name="line-53"></a> <a name="line-54"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Default</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-conid'>Dual</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Dual</span> <span class='hs-varid'>def</span> <a name="line-55"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Default</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Default</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>def</span><span class='hs-layout'>,</span> <span class='hs-varid'>def</span><span class='hs-layout'>)</span> <a name="line-56"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Default</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Default</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-conid'>Default</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>def</span><span class='hs-layout'>,</span> <span class='hs-varid'>def</span><span class='hs-layout'>,</span> <span class='hs-varid'>def</span><span class='hs-layout'>)</span> <a name="line-57"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Default</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Default</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-conid'>Default</span> <span class='hs-varid'>c</span><span class='hs-layout'>,</span> <span class='hs-conid'>Default</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>,</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>def</span><span class='hs-layout'>,</span> <span class='hs-varid'>def</span><span class='hs-layout'>,</span> <span class='hs-varid'>def</span><span class='hs-layout'>,</span> <span class='hs-varid'>def</span><span class='hs-layout'>)</span> <a name="line-58"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Default</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Default</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-conid'>Default</span> <span class='hs-varid'>c</span><span class='hs-layout'>,</span> <span class='hs-conid'>Default</span> <span class='hs-varid'>d</span><span class='hs-layout'>,</span> <span class='hs-conid'>Default</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>,</span> <span class='hs-varid'>d</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>def</span><span class='hs-layout'>,</span> <span class='hs-varid'>def</span><span class='hs-layout'>,</span> <span class='hs-varid'>def</span><span class='hs-layout'>,</span> <span class='hs-varid'>def</span><span class='hs-layout'>,</span> <span class='hs-varid'>def</span><span class='hs-layout'>)</span> </pre></body> </html>
