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<div class="title">Negators<div class="ingroups"><a class="el" href="a01480.html">Utilities</a> &raquo; <a class="el" href="a01499.html">Function Objects</a></div></div>  </div>
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Collaboration diagram for Negators:</div>
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Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a07555.html">std::binary_negate&lt; _Predicate &gt;</a></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a07551.html">std::unary_negate&lt; _Predicate &gt;</a></td></tr>
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<tr class="memitem:gaa48ba7f453a3e4aec335c304eab89d3b"><td class="memTemplParams" colspan="2">template&lt;typename _Predicate &gt; </td></tr>
<tr class="memitem:gaa48ba7f453a3e4aec335c304eab89d3b"><td class="memTemplItemLeft" align="right" valign="top">_GLIBCXX14_CONSTEXPR <a class="el" href="a07551.html">unary_negate</a>&lt; _Predicate &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a01503.html#gaa48ba7f453a3e4aec335c304eab89d3b">std::not1</a> (const _Predicate &amp;__pred)</td></tr>
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<tr class="memitem:ga1244dfac05a74c4665bef243704f51b1"><td class="memTemplParams" colspan="2">template&lt;typename _Predicate &gt; </td></tr>
<tr class="memitem:ga1244dfac05a74c4665bef243704f51b1"><td class="memTemplItemLeft" align="right" valign="top">_GLIBCXX14_CONSTEXPR <a class="el" href="a07555.html">binary_negate</a>&lt; _Predicate &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a01503.html#ga1244dfac05a74c4665bef243704f51b1">std::not2</a> (const _Predicate &amp;__pred)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>The functions <code>not1</code> and <code>not2</code> each take a predicate functor and return an instance of <code>unary_negate</code> or <code>binary_negate</code>, respectively. These classes are functors whose <code>operator()</code> performs the stored predicate function and then returns the negation of the result.</p>
<p>For example, given a vector of integers and a trivial predicate, </p><div class="fragment"><div class="line"><span class="keyword">struct </span>IntGreaterThanThree</div><div class="line">  : <span class="keyword">public</span> <a class="code" href="a07311.html">std::unary_function</a>&lt;int, bool&gt;</div><div class="line">{</div><div class="line">    <span class="keywordtype">bool</span> operator() (<span class="keywordtype">int</span> x) { <span class="keywordflow">return</span> x &gt; 3; }</div><div class="line">};</div><div class="line"></div><div class="line"><a class="code" href="a01484.html#gaaf6e9995ebbd27994d7c73b375f86088">std::find_if</a> (v.begin(), v.end(), <a class="code" href="a01503.html#gaa48ba7f453a3e4aec335c304eab89d3b">not1</a>(IntGreaterThanThree()));</div></div><!-- fragment --><p> The call to <code>find_if</code> will locate the first index (i) of <code>v</code> for which <code>!(v[i] &gt; 3)</code> is true.</p>
<p>The not1/unary_negate combination works on predicates taking a single argument. The not2/binary_negate combination works on predicates which take two arguments. </p>
<h2 class="groupheader">Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#gaa48ba7f453a3e4aec335c304eab89d3b">&#9670;&nbsp;</a></span>not1()</h2>

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          <td class="memname">_GLIBCXX14_CONSTEXPR <a class="el" href="a07551.html">unary_negate</a>&lt;_Predicate&gt; std::not1 </td>
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<p>One of the <a class="el" href="a01503.html">negation functors</a>. </p>

<p class="definition">Definition at line <a class="el" href="a00542_source.html#l01000">1000</a> of file <a class="el" href="a00542_source.html">stl_function.h</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#ga1244dfac05a74c4665bef243704f51b1">&#9670;&nbsp;</a></span>not2()</h2>

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          <td class="memname">_GLIBCXX14_CONSTEXPR <a class="el" href="a07555.html">binary_negate</a>&lt;_Predicate&gt; std::not2 </td>
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<p>One of the <a class="el" href="a01503.html">negation functors</a>. </p>

<p class="definition">Definition at line <a class="el" href="a00542_source.html#l01028">1028</a> of file <a class="el" href="a00542_source.html">stl_function.h</a>.</p>

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