<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"
lang="en" dir="ltr">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>
not2 [C++ Reference]
</title>
<meta name="generator" content="DokuWiki Release 2009-12-25c "Lemming"" />
<meta name="robots" content="index,follow" />
<meta name="date" content="2009-12-21T18:41:06-0800" />
<meta name="keywords" content="stl,functional,not2" />
<link rel="search" type="application/opensearchdescription+xml" href="/wiki/lib/exe/opensearch.php" title="C++ Reference" />
<link rel="start" href="/wiki/" />
<link rel="contents" href="/wiki/stl/functional/not2?do=index" title="Index" />
<link rel="alternate" type="application/rss+xml" title="Recent Changes" href="/wiki/feed.php" />
<link rel="alternate" type="application/rss+xml" title="Current Namespace" href="/wiki/feed.php?mode=list&ns=stl:functional" />
<link rel="edit" title="Edit this page" href="/wiki/stl/functional/not2?do=edit" />
<link rel="alternate" type="text/html" title="Plain HTML" href="/wiki/_export/xhtml/stl/functional/not2" />
<link rel="alternate" type="text/plain" title="Wiki Markup" href="/wiki/_export/raw/stl/functional/not2" />
<link rel="canonical" href="http://www.cppreference.com/wiki/stl/functional/not2" />
<link rel="stylesheet" media="all" type="text/css" href="/wiki/lib/exe/css.php?s=all&t=custom1&tseed=1272971091" />
<link rel="stylesheet" media="screen" type="text/css" href="/wiki/lib/exe/css.php?t=custom1&tseed=1272971091" />
<link rel="stylesheet" media="print" type="text/css" href="/wiki/lib/exe/css.php?s=print&t=custom1&tseed=1272971091" />
<script type="text/javascript" charset="utf-8" ><!--//--><![CDATA[//><!--
var NS='stl:functional';var JSINFO = {"id":"stl:functional:not2","namespace":"stl:functional"};
//--><!]]></script>
<script type="text/javascript" charset="utf-8" src="/wiki/lib/exe/js.php?tseed=1272971091" ></script>
<link rel="shortcut icon" href="/wiki/lib/tpl/custom1/images/favicon.png" />
</head>
<body>
<div class="dokuwiki">
<div class="stylehead">
<div class="header">
<div class="pagename">
[[<a href="../../stl/functional/not2.html" title="Backlinks">not2</a>]]
</div>
<div class="logo">
<a href="http://www.cppreference.com" name="dokuwiki__top" id="dokuwiki__top" accesskey="h" title="[ALT+H]">C++ Reference</a> </div>
<div class="clearer"></div>
</div>
<div class="breadcrumbs">
<span class="bchead">You are here: </span><a href="../../start.html" title="start">C++ Reference</a> » <a href="../../stl/start.html" title="stl:start">C++ Standard Template Library</a> » <a href="../../stl/functional/start.html" title="stl:functional:start">The <functional> header file</a> » <a href="../../stl/functional/not2.html" title="stl:functional:not2">not2</a> </div>
</div>
<div class="plugin_translation"><span>Translations of this page<sup><a href="../../localization.html" class="wikilink1" title="localization">?</a></sup>:</span> <ul> <li><div class="li"><span class="curid"><a href="../../stl/functional/not2.html" class="wikilink1" title="stl:functional:not2">en</a></span></div></li> <li><div class="li"><a href="../../br-pt/stl/functional/not2.html" class="wikilink2" title="br-pt:stl:functional:not2" rel="nofollow">br-pt</a></div></li> <li><div class="li"><a href="../../cn/stl/functional/not2.html" class="wikilink2" title="cn:stl:functional:not2" rel="nofollow">cn</a></div></li> <li><div class="li"><a href="../../cz/stl/functional/not2.html" class="wikilink2" title="cz:stl:functional:not2" rel="nofollow">cz</a></div></li> <li><div class="li"><a href="../../de/stl/functional/not2.html" class="wikilink2" title="de:stl:functional:not2" rel="nofollow">de</a></div></li> <li><div class="li"><a href="../../es/stl/functional/not2.html" class="wikilink2" title="es:stl:functional:not2" rel="nofollow">es</a></div></li> <li><div class="li"><a href="../../fr/stl/functional/not2.html" class="wikilink2" title="fr:stl:functional:not2" rel="nofollow">fr</a></div></li> <li><div class="li"><a href="../../it/stl/functional/not2.html" class="wikilink2" title="it:stl:functional:not2" rel="nofollow">it</a></div></li> <li><div class="li"><a href="../../jp/stl/functional/not2.html" class="wikilink2" title="jp:stl:functional:not2" rel="nofollow">jp</a></div></li> <li><div class="li"><a href="../../nl/stl/functional/not2.html" class="wikilink2" title="nl:stl:functional:not2" rel="nofollow">nl</a></div></li> <li><div class="li"><a href="../../pl/stl/functional/not2.html" class="wikilink2" title="pl:stl:functional:not2" rel="nofollow">pl</a></div></li> <li><div class="li"><a href="../../ro/stl/functional/not2.html" class="wikilink2" title="ro:stl:functional:not2" rel="nofollow">ro</a></div></li> <li><div class="li"><a href="../../ru/stl/functional/not2.html" class="wikilink2" title="ru:stl:functional:not2" rel="nofollow">ru</a></div></li> <li><div class="li"><a href="../../sk/stl/functional/not2.html" class="wikilink2" title="sk:stl:functional:not2" rel="nofollow">sk</a></div></li> <li><div class="li"><a href="../../tr/stl/functional/not2.html" class="wikilink2" title="tr:stl:functional:not2" rel="nofollow">tr</a></div></li> <li><div class="li"><a href="../../tw/stl/functional/not2.html" class="wikilink2" title="tw:stl:functional:not2" rel="nofollow">tw</a></div></li></ul></div>
<div class="page">
<script src="http://www.google-analytics.com/urchin.js" type="text/javascript">
</script>
<script type="text/javascript">
_uacct = "UA-2828341-1";
urchinTracker();
</script>
<!-- wikipage start -->
<!-- TOC START -->
<div class="toc">
<div class="tocheader toctoggle" id="toc__header">Table of Contents</div>
<div id="toc__inside">
<ul class="toc">
<li class="level1"><div class="li"><span class="li"><a href="#not2" class="toc">not2</a></span></div>
<ul class="toc">
<li class="clear">
<ul class="toc">
<li class="level3"><div class="li"><span class="li"><a href="#parameters" class="toc">Parameters</a></span></div></li>
<li class="level3"><div class="li"><span class="li"><a href="#predicate" class="toc">Predicate</a></span></div></li>
</ul>
</li>
</ul>
</li>
<li class="level1"><div class="li"><span class="li"><a href="#return_value" class="toc">Return value</a></span></div></li>
<li class="level1"><div class="li"><span class="li"><a href="#example" class="toc">Example</a></span></div></li></ul>
</div>
</div>
<!-- TOC END -->
<h1><a name="not2" id="not2">not2</a></h1>
<div class="level1">
<pre class="c code c++" style="font-family:monospace;"><span class="kw2">function</span> template<span class="sy0"><</span>functional<span class="sy0">></span>template <span class="sy0"><</span>class Predicate<span class="sy0">></span>
binary_negate<span class="sy0"><</span>Predicate<span class="sy0">></span> not2 <span class="br0">(</span><span class="kw4">const</span> Predicate<span class="sy0">&</span> pred<span class="br0">)</span><span class="sy0">;</span></pre>
</div>
<h5><a name="return_negation_of_binary_function_object" id="return_negation_of_binary_function_object">Return negation of binary function object</a></h5>
<div class="level5">
<p>
This function constructs a function object that has the opposite behavior of pred (its argument, another function object).
</p>
<p>
Function objects are objects whose class defines member function operator(). This member function allows the object to be used with the same syntax as a regular function call, and therefore it can be used in templates instead of a pointer to a function.
</p>
<p>
The function object returned by not2 has its operator() defined such that it returns true when pred would return false, and false when pred would return true.
</p>
<p>
It is defined with the same behavior as:
</p>
<pre class="c code c++" style="font-family:monospace;"> template <span class="sy0"><</span>class Predicate<span class="sy0">></span>
binary_negate<span class="sy0"><</span>Predicate<span class="sy0">></span> not2 <span class="br0">(</span><span class="kw4">const</span> Predicate<span class="sy0">&</span> pred<span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">return</span> binary_negate<span class="sy0"><</span>Predicate<span class="sy0">></span><span class="br0">(</span>pred<span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span></pre>
<p>
not2 is specifically designed to negate function objects (predicates) derived from binary_function (members first_argument_type and second_argument_type are required). For unary function objects, see not1.
</p>
</div>
<div class="secedit"><form class="button btn_secedit" method="post" action="/wiki/stl/functional/not2"><div class="no"><input type="hidden" name="do" value="edit" /><input type="hidden" name="lines" value="1-1135" /><input type="hidden" name="rev" value="1261449666" /><input type="submit" value="Edit" class="button" title="not2" /></div></form></div>
<h3><a name="parameters" id="parameters">Parameters</a></h3>
<div class="level3">
</div>
<div class="secedit"><form class="button btn_secedit" method="post" action="/wiki/stl/functional/not2"><div class="no"><input type="hidden" name="do" value="edit" /><input type="hidden" name="lines" value="1136-1157" /><input type="hidden" name="rev" value="1261449666" /><input type="submit" value="Edit" class="button" title="Parameters" /></div></form></div>
<h3><a name="predicate" id="predicate">Predicate</a></h3>
<div class="level3">
<p>
Binary function object derived from binary_function.
</p>
</div>
<div class="secedit"><form class="button btn_secedit" method="post" action="/wiki/stl/functional/not2"><div class="no"><input type="hidden" name="do" value="edit" /><input type="hidden" name="lines" value="1158-1236" /><input type="hidden" name="rev" value="1261449666" /><input type="submit" value="Edit" class="button" title="Predicate" /></div></form></div>
<h1><a name="return_value" id="return_value">Return value</a></h1>
<div class="level1">
<p>
A binary function object with the opposite behavior of pred.
binary_negate is a type derived from binary_function.
</p>
</div>
<div class="secedit"><form class="button btn_secedit" method="post" action="/wiki/stl/functional/not2"><div class="no"><input type="hidden" name="do" value="edit" /><input type="hidden" name="lines" value="1237-1381" /><input type="hidden" name="rev" value="1261449666" /><input type="submit" value="Edit" class="button" title="Return value" /></div></form></div>
<h1><a name="example" id="example">Example</a></h1>
<div class="level1">
<pre class="c code c++" style="font-family:monospace;"> <span class="co1">// not2 example</span>
<span class="co2">#include <iostream></span>
<span class="co2">#include <functional></span>
<span class="co2">#include <algorithm></span>
using namespace std<span class="sy0">;</span>
<span class="kw4">int</span> main <span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
<span class="kw4">int</span> foo<span class="br0">[</span><span class="br0">]</span> <span class="sy0">=</span> <span class="br0">{</span>10<span class="sy0">,</span>20<span class="sy0">,</span>30<span class="sy0">,</span>40<span class="sy0">,</span>50<span class="br0">}</span><span class="sy0">;</span>
<span class="kw4">int</span> bar<span class="br0">[</span><span class="br0">]</span> <span class="sy0">=</span> <span class="br0">{</span>0<span class="sy0">,</span>15<span class="sy0">,</span>30<span class="sy0">,</span>45<span class="sy0">,</span>60<span class="br0">}</span><span class="sy0">;</span>
pair<span class="sy0"><</span>int<span class="sy0">*,</span><span class="kw4">int</span><span class="sy0">*></span> firstmatch<span class="sy0">,</span>firstmismatch<span class="sy0">;</span>
firstmismatch<span class="sy0">=</span>mismatch <span class="br0">(</span>foo<span class="sy0">,</span> foo<span class="sy0">+</span>5<span class="sy0">,</span> bar<span class="sy0">,</span> equal_to<span class="sy0"><</span>int<span class="sy0">></span><span class="br0">(</span><span class="br0">)</span> <span class="br0">)</span><span class="sy0">;</span>
firstmatch<span class="sy0">=</span>mismatch <span class="br0">(</span>foo<span class="sy0">,</span> foo<span class="sy0">+</span>5<span class="sy0">,</span> bar<span class="sy0">,</span> not2<span class="br0">(</span>equal_to<span class="sy0"><</span>int<span class="sy0">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="br0">)</span><span class="sy0">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> <span class="st0">"First mismatch in bar is "</span> <span class="sy0"><<</span> <span class="sy0">*</span>firstmismatch.<span class="me1">second</span> <span class="sy0"><<</span> <span class="st0">"<span class="es1">\n</span>"</span><span class="sy0">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> <span class="st0">"First match in bar is "</span> <span class="sy0"><<</span> <span class="sy0">*</span>firstmatch.<span class="me1">second</span> <span class="sy0"><<</span> <span class="st0">"<span class="es1">\n</span>"</span><span class="sy0">;</span>
<span class="kw1">return</span> <span class="nu0">0</span><span class="sy0">;</span>
<span class="br0">}</span></pre><pre class="c code c++" style="font-family:monospace;">First mismatch in bar is <span class="nu0">0</span>
First match in bar is <span class="nu0">30</span></pre>
</div>
<div class="secedit"><form class="button btn_secedit" method="post" action="/wiki/stl/functional/not2"><div class="no"><input type="hidden" name="do" value="edit" /><input type="hidden" name="lines" value="1382-" /><input type="hidden" name="rev" value="1261449666" /><input type="submit" value="Edit" class="button" title="Example" /></div></form></div>
<!-- wikipage stop -->
</div>
<div class="clearer"> </div>
<div class="stylefoot">
<div class="meta">
<div class="user">
</div>
<!--
<div class="doc">
stl/functional/not2.txt · Last modified: 12/21/2009 18:41 by nate </div>
-->
</div>
<div class="bar" id="bar__bottom">
<div class="bar-left" id="bar__bottomleft">
<a href="../../stl/functional/not2.html" class="action edit" accesskey="e" rel="nofollow">Edit this page</a> •
<a href="../../stl/functional/not2.html" class="action revisions" accesskey="o" rel="nofollow">Old revisions</a> </div>
<div class="bar-right" id="bar__bottomright">
•
•
•
<a href="../../stl/functional/not2.html" class="action login" rel="nofollow">Login</a> •
<a href="../../stl/functional/not2.html" class="action index" accesskey="x" rel="nofollow">Index</a> •
<a href="../../stl/functional/not2.html" class="action recent" accesskey="r" rel="nofollow">Recent changes</a> •
<a href="../../feed.php.html" title="Recent changes RSS feed">RSS</a> •
<a href='http://creativecommons.org/licenses/by/3.0/us/' title='Creative Commons license'>cc</a> •
<form action="/wiki/" accept-charset="utf-8" class="search" id="dw__search"><div class="no"><input type="hidden" name="do" value="search" /><input type="text" id="qsearch__in" accesskey="f" name="id" class="edit" title="[ALT+F]" /><input type="submit" value="Search" class="button" title="Search" /><div id="qsearch__out" class="ajax_qsearch JSpopup"></div></div></form>
</div>
<div class="clearer"></div>
</div>
</div>
</div>
<div class="no"><img src="/wiki/lib/exe/indexer.php?id=stl%3Afunctional%3Anot2&1273199566" width="1" height="1" alt="" /></div>
</body>
</html>