1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Unstable Sorting</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="../rationale.html" title="Rationale"> 9<link rel="prev" href="why_spreadsort.html" title="Why spreadsort?"> 10<link rel="next" href="optimization.html" title="Unused X86 optimization"> 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 href="../../../../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="why_spreadsort.html"><img src="../../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../rationale.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="optimization.html"><img src="../../../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h6 class="title"> 27<a name="sort.single_thread.spreadsort.sort_hpp.rationale.unstable_sort"></a><a class="link" href="unstable_sort.html" title="Unstable Sorting">Unstable 28 Sorting</a> 29</h6></div></div></div> 30<p> 31 Making a <a href="http://en.wikipedia.org/wiki/Radix_sort" target="_top">radix 32 sort</a> stable requires the usage of an external copy of the data. 33 A stable hybrid algorithm also requires a stable comparison-based algorithm, 34 and these are generally slow. LSD <a href="http://en.wikipedia.org/wiki/Radix_sort" target="_top">radix 35 sort</a> uses an external copy of the data, and provides stability, 36 along with likely being faster (than a stable hybrid sort), so that's 37 probably a better way to go for integer and floating-point types. It 38 might make sense to make a stable version of <code class="literal"><code class="computeroutput"><a class="link" href="../../../../../boost/sort/spreadsort/string_s_idm45878543797168.html" title="Function template string_sort">string_sort</a></code></code> 39 using external memory, but for simplicity this has been left out for 40 now. 41 </p> 42</div> 43<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 44<td align="left"></td> 45<td align="right"><div class="copyright-footer">Copyright © 2014-2017 Steven 46 Ross, Francisco Tapia, Orson Peters<p> 47 Distributed under the <a href="http://boost.org/LICENSE_1_0.txt" target="_top">Boost 48 Software License, Version 1.0</a>. 49 </p> 50</div></td> 51</tr></table> 52<hr> 53<div class="spirit-nav"> 54<a accesskey="p" href="why_spreadsort.html"><img src="../../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../rationale.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="optimization.html"><img src="../../../../../../../../../doc/src/images/next.png" alt="Next"></a> 55</div> 56</body> 57</html> 58
