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61 lines
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61 lines
2.9 KiB
HTML
<!doctype html public "-//ietf//dtd html//en">
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<html><head><title>boost::mpl::Reference/less equal</title>
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<link rel="stylesheet" href="../mpl_wiki.css">
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</head><body bgcolor="white">
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<h1><a href="../Table_of_Content.html"><img src="../mpl_logo.jpg" alt="[Home]" border=0 align="right"></a>less_equal</h1><h3>Synopsis</h3>
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<p>
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<pre>
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template<
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typename T1
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, typaname T2
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>
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struct less_equal
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{
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typedef <em>unspecified</em> type;
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};
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</pre>
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<p>
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<h3>Description</h3>
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<p>
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Returns <code>true_c</code> if <code>T1::value <= T2::value</code> and <code>false_c</code> otherwise [<a href="#1">1</a>].
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<p>
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<h3>Definition</h3>
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<p>
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<pre>
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#include "<a href="../../../../../\boost/mpl/comparison/less_equal.hpp">boost/mpl/comparison/less_equal.hpp</a>"
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</pre>
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<p>
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<h3>Parameters</h3>
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<table border="1">
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<tr><th> Parameter </th><th> Requirement </th><th> Description </th></tr>
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<tr><td><code>T1, T2</code></td><td>A model of <a href="../Integral_Constant.html">Integral Constant</a></td><td></td></tr>
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</table>
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<p>
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<h3>Expression semantics</h3>
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<p>
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<table border="1">
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<tr><th> Expression </th><th> Expression type </th><th> Precondition </th><th> Semantics </th><th> Postcondition </th></tr>
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<tr><td><code>typedef less_equal<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_c<(t1::value <= t2::value)> c;</code></td><td></td></tr>
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</table>
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<p>
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<h3>Complexity</h3>
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<p>
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Amortized constant time.
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<p>
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<h3>Example</h3>
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<p>
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<pre>
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typedef <a href="../Reference/list_c.html">list_c</a><int,0,1,2,3,4,5,6,7,8,9> numbers;
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typedef <a href="../Reference/remove_if.html">remove_if</a>< numbers, less_equal<_,int_c<4> > >::type result;
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BOOST_STATIC_ASSERT(<a href="../Reference/equal.html">equal</a>< result,<a href="../Reference/range_c.html">range_c</a><int,5,10>,<a href="../Reference/equal_to.html">equal_to</a><_,_> >::type::value));
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</pre>
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<p>
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<h3>Notes</h3>
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<p>
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[<a name="1">1</a>] The <code>less_equal</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>
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<p>
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<h3>See also</h3>
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<p>
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<a href="../Metafunctions.html">Metafunctions</a>, <code><a href="../Reference/less.html">less</a></code>, <code><a href="../Reference/greater.html">greater</a></code>, <code><a href="../Reference/greater_equal.html">greater_equal</a></code>, <code><a href="../Reference/equal.html">equal</a></code>, <code><a href="../Reference/not_equal_to.html">not_equal_to</a></code>
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<p><hr>
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<a href="../Table_of_Content.html">Table of Content</a> | <a href="../Reference.html">Reference</a><br>Last edited July 17, 2002 4:15 am</body></html> |