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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Data.BinPacking</title><link href="ocean.css" rel="stylesheet" type="text/css" title="Ocean" /><script src="haddock-util.js" type="text/javascript"></script><script type="text/javascript">//<![CDATA[
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window.onload = function () {pageLoad();setSynopsis("mini_Data-BinPacking.html");};
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</script></head><body><div id="package-header"><ul class="links" id="page-menu"><li><a href="index.html">Contents</a></li><li><a href="doc-index.html">Index</a></li></ul><p class="caption">MissingH-1.3.0.1: Large utility library</p></div><div id="content"><div id="module-header"><table class="info"><tr><th>Copyright</th><td>Copyright (C) 2008-2011 John Goerzen</td></tr><tr><th>License</th><td>BSD3</td></tr><tr><th>Maintainer</th><td>John Goerzen <jgoerzen@complete.org> </td></tr><tr><th>Stability</th><td>provisional</td></tr><tr><th>Portability</th><td>portable</td></tr><tr><th>Safe Haskell</th><td>None</td></tr><tr><th>Language</th><td>Haskell98</td></tr></table><p class="caption">Data.BinPacking</p></div><div id="description"><p class="caption">Description</p><div class="doc"><p>Tools for packing into bins</p><p>Written by John Goerzen, jgoerzen@complete.org</p><p>This module is designed to solve this type of problem: Given a bunch of
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objects of varying sizes, what is the best possible way to pack them into
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fixed-size bins? This can be used, for instance, by the datapacker program
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to pack files onto CDs or DVDs; by manufacturing environments to pack
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physical items into physicl bins; etc.</p><p>A description of bin packing algorithms can be found at
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<a href="http://en.wikipedia.org/wiki/Bin_packing_problem">http://en.wikipedia.org/wiki/Bin_packing_problem</a>.</p></div></div><div id="synopsis"><p id="control.syn" class="caption expander" onclick="toggleSection('syn')">Synopsis</p><ul id="section.syn" class="hide" onclick="toggleSection('syn')"><li class="src short"><span class="keyword">type</span> <a href="#t:BinPacker">BinPacker</a> = (<a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Prelude.html#t:Num">Num</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Data-Ord.html#t:Ord">Ord</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#t:Show">Show</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#t:Show">Show</a> obj) => [size] -> [(size, obj)] -> <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Data-Either.html#t:Either">Either</a> (<a href="Data-BinPacking.html#t:BinPackerError">BinPackerError</a> size obj) [[(size, obj)]]</li><li class="src short"><span class="keyword">data</span> (<a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Prelude.html#t:Num">Num</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Data-Ord.html#t:Ord">Ord</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#t:Show">Show</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#t:Show">Show</a> obj) => <a href="#t:BinPackerError">BinPackerError</a> size obj<ul class="subs"><li>= <a href="#v:BPTooFewBins">BPTooFewBins</a> [(size, obj)]</li><li>| <a href="#v:BPSizeTooLarge">BPSizeTooLarge</a> size (size, obj)</li><li>| <a href="#v:BPOther">BPOther</a> <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Data-String.html#t:String">String</a></li></ul></li><li class="src short"><a href="#v:packByOrder">packByOrder</a> :: <a href="Data-BinPacking.html#t:BinPacker">BinPacker</a></li><li class="src short"><a href="#v:packLargeFirst">packLargeFirst</a> :: <a href="Data-BinPacking.html#t:BinPacker">BinPacker</a></li></ul></div><div id="interface"><h1>Documentation</h1><div class="top"><p class="src"><span class="keyword">type</span> <a name="t:BinPacker" class="def">BinPacker</a> = (<a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Prelude.html#t:Num">Num</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Data-Ord.html#t:Ord">Ord</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#t:Show">Show</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#t:Show">Show</a> obj) => [size] -> [(size, obj)] -> <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Data-Either.html#t:Either">Either</a> (<a href="Data-BinPacking.html#t:BinPackerError">BinPackerError</a> size obj) [[(size, obj)]]</p><div class="doc"><p>The primary type for bin-packing functions.</p><p>These functions take a list of size of bins. If every bin is the same size,
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you can pass <code>repeat binSize</code> to pass an infinite list of bins if the
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same size. Any surplus bins will simply be ignored. </p><pre>[size] is the sizes of bins
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[(size, obj)] is the sizes and objects
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result is Either error or results</pre></div></div><div class="top"><p class="src"><span class="keyword">data</span> (<a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Prelude.html#t:Num">Num</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Data-Ord.html#t:Ord">Ord</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#t:Show">Show</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#t:Show">Show</a> obj) => <a name="t:BinPackerError" class="def">BinPackerError</a> size obj</p><div class="doc"><p>Potential errors returned as Left values by <code><a href="Data-BinPacking.html#t:BinPacker">BinPacker</a></code> functions.
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Calling <code><a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#v:show">show</a></code> on this value will produce a nice error message suitable for
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display. </p></div><div class="subs constructors"><p class="caption">Constructors</p><table><tr><td class="src"><a name="v:BPTooFewBins" class="def">BPTooFewBins</a> [(size, obj)]</td><td class="doc"><p>Ran out of bins; attached value is the list of objects that do not fit</p></td></tr><tr><td class="src"><a name="v:BPSizeTooLarge" class="def">BPSizeTooLarge</a> size (size, obj)</td><td class="doc"><p>Bin size1 exceeded by at least the given object and size</p></td></tr><tr><td class="src"><a name="v:BPOther" class="def">BPOther</a> <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Data-String.html#t:String">String</a></td><td class="doc"><p>Other error</p></td></tr></table></div><div class="subs instances"><p id="control.i:BinPackerError" class="caption collapser" onclick="toggleSection('i:BinPackerError')">Instances</p><div id="section.i:BinPackerError" class="show"><table><tr><td class="src">(<a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Data-Eq.html#t:Eq">Eq</a> obj, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Prelude.html#t:Num">Num</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Data-Ord.html#t:Ord">Ord</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#t:Show">Show</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#t:Show">Show</a> obj) => <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Data-Eq.html#t:Eq">Eq</a> (<a href="Data-BinPacking.html#t:BinPackerError">BinPackerError</a> size obj)</td><td class="doc empty"> </td></tr><tr><td class="src">(<a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Prelude.html#t:Num">Num</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Data-Ord.html#t:Ord">Ord</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Read.html#t:Read">Read</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Read.html#t:Read">Read</a> obj, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#t:Show">Show</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#t:Show">Show</a> obj) => <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Read.html#t:Read">Read</a> (<a href="Data-BinPacking.html#t:BinPackerError">BinPackerError</a> size obj)</td><td class="doc empty"> </td></tr><tr><td class="src">(<a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Prelude.html#t:Num">Num</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Data-Ord.html#t:Ord">Ord</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#t:Show">Show</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#t:Show">Show</a> obj) => <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#t:Show">Show</a> (<a href="Data-BinPacking.html#t:BinPackerError">BinPackerError</a> size obj)</td><td class="doc empty"> </td></tr><tr><td class="src">(<a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Prelude.html#t:Num">Num</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Data-Ord.html#t:Ord">Ord</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#t:Show">Show</a> size, <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/base-4.8.0.0/Text-Show.html#t:Show">Show</a> obj) => <a href="file:///usr/local/Cellar/ghc/7.10.1/share/doc/ghc/html/libraries/transformers-0.4.2.0/Control-Monad-Trans-Error.html#t:Error">Error</a> (<a href="Data-BinPacking.html#t:BinPackerError">BinPackerError</a> size obj)</td><td class="doc"><p>Let us use this as part of the Either monad </p></td></tr></table></div></div></div><div class="top"><p class="src"><a name="v:packByOrder" class="def">packByOrder</a> :: <a href="Data-BinPacking.html#t:BinPacker">BinPacker</a></p><div class="doc"><p>Pack objects into bins, preserving order. Objects will be taken from the
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input list one by one, and added to each bin until the bin is full. Work will
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then proceed on the next bin. No attempt is made to optimize allocations to
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bins. This is the simplest and most naive bin-packing algorithm, but
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may not make very good use of bin space. </p></div></div><div class="top"><p class="src"><a name="v:packLargeFirst" class="def">packLargeFirst</a> :: <a href="Data-BinPacking.html#t:BinPacker">BinPacker</a></p><div class="doc"><p>Pack objects into bins. For each bin, start with the largest objects,
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and keep packing the largest object from the remainder until no object can
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be found to put in the bin. This is substantially more efficient than
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<code><a href="Data-BinPacking.html#v:packByOrder">packByOrder</a></code>, but requires sorting the input. </p></div></div></div></div><div id="footer"><p>Produced by <a href="http://www.haskell.org/haddock/">Haddock</a> version 2.16.0</p></div></body></html>
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