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+<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Chapter 22. Generalized Operations</title><meta name="generator" content="DocBook XSL Stylesheets V1.74.0" /><meta name="keywords" content=" ISO C++ , library " /><link rel="home" href="../spine.html" title="The GNU C++ Library Documentation" /><link rel="up" href="numerics.html" title="Part X. Numerics" /><link rel="prev" href="complex.html" title="Chapter 21. Complex" /><link rel="next" href="numerics_and_c.html" title="Chapter 23. Interacting with C" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 22. Generalized Operations</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="complex.html">Prev</a> </td><th width="60%" align="center">Part X.
+ Numerics
+
+</th><td width="20%" align="right"> <a accesskey="n" href="numerics_and_c.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.numerics.generalized_ops"></a>Chapter 22. Generalized Operations</h2></div></div></div><p>
+ </p><p>There are four generalized functions in the <numeric> header
+ that follow the same conventions as those in <algorithm>. Each
+ of them is overloaded: one signature for common default operations,
+ and a second for fully general operations. Their names are
+ self-explanatory to anyone who works with numerics on a regular basis:
+ </p><div class="itemizedlist"><ul type="disc"><li><p><code class="code">accumulate</code></p></li><li><p><code class="code">inner_product</code></p></li><li><p><code class="code">partial_sum</code></p></li><li><p><code class="code">adjacent_difference</code></p></li></ul></div><p>Here is a simple example of the two forms of <code class="code">accumulate</code>.
+ </p><pre class="programlisting">
+ int ar[50];
+ int someval = somefunction();
+
+ // ...initialize members of ar to something...
+
+ int sum = std::accumulate(ar,ar+50,0);
+ int sum_stuff = std::accumulate(ar,ar+50,someval);
+ int product = std::accumulate(ar,ar+50,1,std::multiplies<int>());
+ </pre><p>The first call adds all the members of the array, using zero as an
+ initial value for <code class="code">sum</code>. The second does the same, but uses
+ <code class="code">someval</code> as the starting value (thus, <code class="code">sum_stuff == sum +
+ someval</code>). The final call uses the second of the two signatures,
+ and multiplies all the members of the array; here we must obviously
+ use 1 as a starting value instead of 0.
+ </p><p>The other three functions have similar dual-signature forms.
+ </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="complex.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="numerics.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="numerics_and_c.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 21. Complex </td><td width="20%" align="center"><a accesskey="h" href="../spine.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 23. Interacting with C</td></tr></table></div></body></html>
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