l4/pkg/libstdc++-v3/contrib/libstdc++-v3-4.4/doc/html/manual/bk01pt09ch20.html

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   3 <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Chapter 20. Mutating</title><meta name="generator" content="DocBook XSL Stylesheets V1.74.0" /><meta name="keywords" content="&#10;      ISO C++&#10;    , &#10;      library&#10;    , &#10;      algorithm&#10;    " /><link rel="home" href="../spine.html" title="The GNU C++ Library Documentation" /><link rel="up" href="algorithms.html" title="Part IX.  Algorithms" /><link rel="prev" href="bk01pt09pr02.html" title="" /><link rel="next" href="numerics.html" title="Part X.  Numerics" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 20. Mutating</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="bk01pt09pr02.html">Prev</a> </td><th width="60%" align="center">Part IX.
   4   Algorithms
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   6 </th><td width="20%" align="right"> <a accesskey="n" href="numerics.html">Next</a></td></tr></table><hr /></div><div class="chapter" lang="en" xml:lang="en"><div class="titlepage"><div><div><h2 class="title"><a id="manual.algorithms.mutating"></a>Chapter 20. Mutating</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="bk01pt09ch20.html#algorithms.mutating.swap">swap</a></span></dt><dd><dl><dt><span class="sect2"><a href="bk01pt09ch20.html#algorithms.swap.specializations">Specializations</a></span></dt></dl></dd></dl></div><div class="sect1" lang="en" xml:lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="algorithms.mutating.swap"></a><code class="function">swap</code></h2></div></div></div><div class="sect2" lang="en" xml:lang="en"><div class="titlepage"><div><div><h3 class="title"><a id="algorithms.swap.specializations"></a>Specializations</h3></div></div></div><p>If you call <code class="code"> std::swap(x,y); </code> where x and y are standard
   7       containers, then the call will automatically be replaced by a call to
   8       <code class="code"> x.swap(y); </code> instead.
   9    </p><p>This allows member functions of each container class to take over, and
  10       containers' swap functions should have O(1) complexity according to
  11       the standard.  (And while "should" allows implementations to
  12       behave otherwise and remain compliant, this implementation does in
  13       fact use constant-time swaps.)  This should not be surprising, since
  14       for two containers of the same type to swap contents, only some
  15       internal pointers to storage need to be exchanged.
  16    </p></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="bk01pt09pr02.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="algorithms.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="numerics.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"> </td><td width="20%" align="center"><a accesskey="h" href="../spine.html">Home</a></td><td width="40%" align="right" valign="top"> Part X.
  17   Numerics
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