<!doctype html public "-//ietf//dtd html//en">
<html><head><title>boost::mpl::not_equal_to</title>
<link rel="stylesheet" href="../mpl_wiki.css">
</head><body bgcolor="white">
<h1><a href="../Table_of_Contents.html"><img src="../mpl_logo.jpg" alt="[Home]" border=0 align="right"></a>not_equal_to</h1><h3>Synopsis</h3>
<p>
<pre>
template<
typename T1
, typename T2
>
struct not_equal_to
{
typedef <em>unspecified</em> type;
};
</pre>
<p>
<h3>Description</h3>
<p>
Returns <code>true_</code> if <code>T1::value != T2::value</code> and <code>false_</code> otherwise [<a href="#1">1</a>].
<p>
<h3>Definition</h3>
<p>
<pre>
#include "<a href="../../../../../boost/mpl/not_equal_to.hpp">boost/mpl/not_equal_to.hpp</a>"
</pre>
<p>
<h3>Parameters</h3>
<table border="1">
<tr><th> Parameter </th><th> Requirement </th><th> Description </th></tr>
<tr><td><code>T1, T2</code></td><td>A model of <a href="../Integral_Constant.html">Integral Constant</a></td><td></td></tr>
</table>
<p>
<h3>Expression semantics</h3>
<p>
<table border="1">
<tr><th> Expression </th><th> Expression type </th><th> Precondition </th><th> Semantics </th><th> Postcondition </th></tr>
<tr><td><code>typedef not_equal_to<t1,t2>::type c;</code></td><td>A model of <code>bool</code> <a href="../Integral_Constant.html">Integral Constant</a></td><td></td><td>Equivalent to <code>typedef bool_<(t1::value != t2::value)> c;</code></td><td></td></tr>
</table>
<p>
<h3>Complexity</h3>
<p>
Amortized constant time.
<p>
<h3>Example</h3>
<p>
<pre>
typedef <a href="../Reference/list_c.html">list_c</a><int,1,5,0,7,5,-1,2,4,5> numbers;
typedef <a href="../Reference/remove_if.html">remove_if</a>< numbers, not_equal_to<_1,int_<5> > >::type fives;
BOOST_STATIC_ASSERT(<a href="../Reference/equal_to.html">equal_to</a>< <a href="../Reference/count_if.html">count_if</a>< fives, <a href="../Reference/equal_to.html">equal_to</a><_1,int_<5> > >::type, <a href="../Reference/size.html">size</a><fives>::type >::type::value));
</pre>
<p>
<h3>Notes</h3>
<p>
[<a name="1">1</a>] The <code>not_equal_to</code> metafunction can be (and is expected to be) specialized by user to work on user-defined types that do not satisfy the <a href="../Integral_Constant.html">Integral Constant</a> requirements. The requirements listed here are the ones imposed by the default implementation.<br>
<p>
<h3>See also</h3>
<p>
<a href="../Metafunctions.html">Metafunctions</a>, <code><a href="../Reference/equal_to.html">equal_to</a></code>, <code><a href="../Reference/less.html">less</a></code>, <code><a href="../Reference/less_equal.html">less_equal</a></code>, <code><a href="../Reference/greater.html">greater</a></code>, <code><a href="../Reference/greater_equal.html">greater_equal</a></code>
<p><hr>
<a href="../Table_of_Contents.html">Table of Contents</a><br>Last edited March 10, 2003 6:20 am</body></html>
