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<div class="title">Negators<div class="ingroups"><a class="el" href="a01717.html">Function Objects</a></div></div> </div>
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Collaboration diagram for Negators:</div>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="a00655.html">std::binary_negate< _Predicate ></a></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="a01004.html">std::unary_negate< _Predicate ></a></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:ga1fa77600b0e213eaec448448f702ef40"><td class="memTemplParams" colspan="2">template<typename _Predicate > </td></tr>
<tr class="memitem:ga1fa77600b0e213eaec448448f702ef40"><td class="memTemplItemLeft" align="right" valign="top">unary_negate< _Predicate > </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a01721.html#ga1fa77600b0e213eaec448448f702ef40">std::not1</a> (const _Predicate &__pred)</td></tr>
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<tr class="memitem:ga5ab22ed0b61c05cdae0da63eeb6e7d33"><td class="memTemplParams" colspan="2">template<typename _Predicate > </td></tr>
<tr class="memitem:ga5ab22ed0b61c05cdae0da63eeb6e7d33"><td class="memTemplItemLeft" align="right" valign="top">binary_negate< _Predicate > </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a01721.html#ga5ab22ed0b61c05cdae0da63eeb6e7d33">std::not2</a> (const _Predicate &__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="a01003.html">std::unary_function<int, bool></a></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 > 3; }</div>
<div class="line">* };</div>
<div class="line">*</div>
<div class="line">* <a class="code" href="a01705.html#gaaf6e9995ebbd27994d7c73b375f86088">std::find_if</a> (v.begin(), v.end(), <a class="code" href="a01721.html#ga1fa77600b0e213eaec448448f702ef40">not1</a>(IntGreaterThanThree()));</div>
<div class="line">* </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] > 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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template<typename _Predicate > </div>
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<td class="memname">unary_negate<_Predicate> std::not1 </td>
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<p>One of the <a class="el" href="a01721.html">negation functors</a>. </p>
<p>Definition at line <a class="el" href="a01551_source.html#l00369">369</a> of file <a class="el" href="a01551_source.html">stl_function.h</a>.</p>
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<td class="memname">binary_negate<_Predicate> std::not2 </td>
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<p>One of the <a class="el" href="a01721.html">negation functors</a>. </p>
<p>Definition at line <a class="el" href="a01551_source.html#l00394">394</a> of file <a class="el" href="a01551_source.html">stl_function.h</a>.</p>
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