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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Chapter 23. Algorithms</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"/><meta name="keywords" content=" ISO C++ , library "/><link rel="home" href="../spine.html" title="The GNU C++ Library"/><link rel="up" href="extensions.html" title="Part III. Extensions"/><link rel="prev" href="ext_utilities.html" title="Chapter 22. Utilities"/><link rel="next" href="ext_numerics.html" title="Chapter 24. Numerics"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 23. Algorithms</th></tr><tr><td align="left"><a accesskey="p" href="ext_utilities.html">Prev</a> </td><th width="60%" align="center">Part III.
Extensions
</th><td align="right"> <a accesskey="n" href="ext_numerics.html">Next</a></td></tr></table><hr/></div><div class="chapter" title="Chapter 23. Algorithms"><div class="titlepage"><div><div><h2 class="title"><a id="manual.ext.algorithms"/>Chapter 23. Algorithms</h2></div></div></div><p>25.1.6 (count, count_if) is extended with two more versions of count
and count_if. The standard versions return their results. The
additional signatures return void, but take a final parameter by
reference to which they assign their results, e.g.,
</p><pre class="programlisting">
void count (first, last, value, n);</pre><p>25.2 (mutating algorithms) is extended with two families of signatures,
random_sample and random_sample_n.
</p><p>25.2.1 (copy) is extended with
</p><pre class="programlisting">
copy_n (_InputIter first, _Size count, _OutputIter result);</pre><p>which copies the first 'count' elements at 'first' into 'result'.
</p><p>25.3 (sorting 'n' heaps 'n' stuff) is extended with some helper
predicates. Look in the doxygen-generated pages for notes on these.
</p><div class="itemizedlist"><ul class="itemizedlist"><li class="listitem"><p><code class="code">is_heap</code> tests whether or not a range is a heap.</p></li><li class="listitem"><p><code class="code">is_sorted</code> tests whether or not a range is sorted in
nondescending order.</p></li></ul></div><p>25.3.8 (lexicographical_compare) is extended with
</p><pre class="programlisting">
lexicographical_compare_3way(_InputIter1 first1, _InputIter1 last1,
_InputIter2 first2, _InputIter2 last2)</pre><p>which does... what?
</p></div><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td align="left"><a accesskey="p" href="ext_utilities.html">Prev</a> </td><td align="center"><a accesskey="u" href="extensions.html">Up</a></td><td align="right"> <a accesskey="n" href="ext_numerics.html">Next</a></td></tr><tr><td align="left" valign="top">Chapter 22. Utilities </td><td align="center"><a accesskey="h" href="../spine.html">Home</a></td><td align="right" valign="top"> Chapter 24. Numerics</td></tr></table></div></body></html>
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