1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Function template reverse_string_sort</title> 5<link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../index.html" title="Boost.Sort"> 8<link rel="up" href="../../../header/boost/sort/spreadsort/string_sort_hpp.html" title="Header <boost/sort/spreadsort/string_sort.hpp>"> 9<link rel="prev" href="reverse__idm45878543470704.html" title="Function template reverse_string_sort"> 10<link rel="next" href="../../../sort/single_thread/pdqsort.html" title="2.2.- pdqsort"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../boost.png"></td> 15<td align="center"><a 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class="refentry"> 26<a name="boost.sort.spreadsort.reverse__idm45878543439168"></a><div class="titlepage"></div> 27<div class="refnamediv"> 28<h2><span class="refentrytitle">Function template reverse_string_sort</span></h2> 29<p>boost::sort::spreadsort::reverse_string_sort — Reverse String sort algorithm using range. </p> 30</div> 31<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 32<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../../header/boost/sort/spreadsort/string_sort_hpp.html" title="Header <boost/sort/spreadsort/string_sort.hpp>">boost/sort/spreadsort/string_sort.hpp</a>> 33 34</span> 35<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Range<span class="special">,</span> <span class="keyword">typename</span> Get_char<span class="special">,</span> <span class="keyword">typename</span> Get_length<span class="special">,</span> 36 <span class="keyword">typename</span> Compare<span class="special">></span> 37 <span class="keyword">void</span> <span class="identifier">reverse_string_sort</span><span class="special">(</span><span class="identifier">Range</span> <span class="special">&</span> range<span class="special">,</span> <span class="identifier">Get_char</span> get_character<span class="special">,</span> 38 <span class="identifier">Get_length</span> length<span class="special">,</span> <span class="identifier">Compare</span> comp<span class="special">)</span><span class="special">;</span></pre></div> 39<div class="refsect1"> 40<a name="idm45477844058224"></a><h2>Description</h2> 41<p>(All variants fall back to <code class="computeroutput">boost::sort::pdqsort</code> if the data size is too small, < <code class="computeroutput">detail::min_sort_size</code>).</p> 42<p><code class="computeroutput">string_sort</code> is a fast templated in-place hybrid radix/comparison algorithm, which in testing tends to be roughly 50% to 2X faster than <code class="computeroutput">std::sort</code> for large tests (>=100kB).<br> 43</p> 44<p><b> </b>Worst-case performance is <span class="emphasis"><em> O(N * (lg(range)/s + s)) </em></span>, so <code class="computeroutput">string_sort</code> is asymptotically faster than pure comparison-based algorithms. <br> 45<br> 46Some performance plots of runtime vs. n and log(range) are provided:<br> 47<a href="../../../../../doc/graph/windows_string_sort.htm" target="_top">windows_string_sort</a><br> 48<a href="../../../../../doc/graph/osx_string_sort.htm" target="_top">osx_string_sort</a></p> 49<p> 50 51 52 53 54 55</p> 56<div class="warning"><table border="0" summary="Warning"> 57<tr> 58<td rowspan="2" align="center" valign="top" width="25"><img alt="[Warning]" src="../../../../../../../doc/src/images/warning.png"></td> 59<th align="left">Warning</th> 60</tr> 61<tr><td align="left" valign="top"><p>Throwing an exception may cause data loss. This will also throw if a small vector resize throws, in which case there will be no data loss. </p></td></tr> 62</table></div> 63<p> 64</p> 65<div class="warning"><table border="0" summary="Warning"> 66<tr> 67<td rowspan="2" align="center" valign="top" width="25"><img alt="[Warning]" src="../../../../../../../doc/src/images/warning.png"></td> 68<th align="left">Warning</th> 69</tr> 70<tr><td align="left" valign="top"><p>Invalid arguments cause undefined behaviour. </p></td></tr> 71</table></div> 72<p> 73</p> 74<div class="note"><table border="0" summary="Note"> 75<tr> 76<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../doc/src/images/note.png"></td> 77<th align="left">Note</th> 78</tr> 79<tr><td align="left" valign="top"><p><code class="computeroutput">spreadsort</code> function provides a wrapper that calls the fastest sorting algorithm available for a data type, enabling faster generic-programming.</p></td></tr> 80</table></div> 81<p> 82</p> 83<p>The lesser of <span class="emphasis"><em> O(N*log(N)) </em></span> comparisons and <span class="emphasis"><em> O(N*log(K/S + S)) </em></span>operations worst-case, where: </p> 84<p> 85 86</p> 87<p>* N is <code class="computeroutput">last</code> - <code class="computeroutput">first</code>, </p> 88<p> 89 90</p> 91<p>* K is the log of the range in bits (32 for 32-bit integers using their full range), </p> 92<p> 93 94</p> 95<p>* S is a constant called max_splits, defaulting to 11 (except for strings where it is the log of the character size). </p> 96<p> 97 98</p> 99<div class="variablelist"><table border="0" class="variablelist compact"> 100<colgroup> 101<col align="left" valign="top"> 102<col> 103</colgroup> 104<tbody> 105<tr> 106<td><p><span class="term">Parameters:</span></p></td> 107<td><div class="variablelist"><table border="0" class="variablelist compact"> 108<colgroup> 109<col align="left" valign="top"> 110<col> 111</colgroup> 112<tbody> 113<tr> 114<td><p><span class="term"><code class="computeroutput">comp</code></span></p></td> 115<td><p>A binary functor that returns whether the first element passed to it should go before the second in order.</p></td> 116</tr> 117<tr> 118<td><p><span class="term"><code class="computeroutput">get_character</code></span></p></td> 119<td><p>Bracket functor equivalent to <code class="computeroutput">operator</code>[], taking a number corresponding to the character offset. </p></td> 120</tr> 121<tr> 122<td><p><span class="term"><code class="computeroutput">length</code></span></p></td> 123<td><p>Functor to get the length of the string in characters. </p></td> 124</tr> 125<tr> 126<td><p><span class="term"><code class="computeroutput">range</code></span></p></td> 127<td><p>Range [first, last) for sorting. </p></td> 128</tr> 129</tbody> 130</table></div></td> 131</tr> 132<tr> 133<td><p><span class="term">Requires:</span></p></td> 134<td><p>[<code class="computeroutput">first</code>, <code class="computeroutput">last</code>) is a valid range. </p></td> 135</tr> 136<tr> 137<td><p><span class="term">Postconditions:</span></p></td> 138<td><p>The elements in the range [<code class="computeroutput">first</code>, <code class="computeroutput">last</code>) are sorted in ascending order.</p></td> 139</tr> 140<tr> 141<td><p><span class="term">Returns:</span></p></td> 142<td><p><code class="computeroutput">void</code>.</p></td> 143</tr> 144<tr> 145<td><p><span class="term">Throws:</span></p></td> 146<td>std::exception Propagates exceptions if any of the element comparisons, the element swaps (or moves), the right shift, subtraction of right-shifted elements, functors, or any operations on iterators throw.</td> 147</tr> 148</tbody> 149</table></div> 150</div> 151</div> 152<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 153<td align="left"></td> 154<td align="right"><div class="copyright-footer">Copyright © 2014-2017 Steven 155 Ross, Francisco Tapia, Orson Peters<p> 156 Distributed under the <a href="http://boost.org/LICENSE_1_0.txt" target="_top">Boost 157 Software License, Version 1.0</a>. 158 </p> 159</div></td> 160</tr></table> 161<hr> 162<div class="spirit-nav"> 163<a accesskey="p" href="reverse__idm45878543470704.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../../header/boost/sort/spreadsort/string_sort_hpp.html"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../../../sort/single_thread/pdqsort.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 164</div> 165</body> 166</html> 167
