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59 lines
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59 lines
2.3 KiB
HTML
<!doctype html public "-//ietf//dtd html//en">
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<html><head><title>boost::mpl::is_sequence</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_Contents.html"><img src="../mpl_logo.jpg" alt="[Home]" border=0 align="right"></a>is_sequence</h1><h3>Synopsis</h3>
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<p>
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<pre>
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template<
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typename T
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>
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struct is_sequence
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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 an <a href="../Integral_Constant.html">Integral Constant</a> <code>c</code> such that <code>c::value == true</code> if and only if <code>T</code> is a model of <a href="../Sequence.html">Sequence</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/is_sequence.hpp">boost/mpl/is_sequence.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>T</code></td><td>A type</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 is_sequence<T>::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 <a href="../Reference/not.html">not_</a>< is_same< <a href="../Reference/begin.html">begin</a><T>::type,void_ > >::type c;</code></td><td></td></tr>
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</table>
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<p>
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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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struct UDT {};
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BOOST_STATIC_ASSERT( !is_sequence<int>::value );
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BOOST_STATIC_ASSERT( !is_sequence<UDT>::value );
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BOOST_STATIC_ASSERT( is_sequence< <a href="../Reference/list.html">list</a><> >::value );
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BOOST_STATIC_ASSERT( is_sequence< <a href="../Reference/vector.html">vector</a><> >::value );
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</pre>
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<p>
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<h3>See also</h3>
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<p>
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<a href="../Sequence.html">Sequence</a>, <code><a href="../Reference/begin.html">begin</a></code>, <code><a href="../Reference/end.html">end</a></code>, <code>as_sequence</code>
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<p><hr>
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<a href="../Table_of_Contents.html">Table of Contents</a><br>Last edited July 1, 2003 4:08 pm</body></html> |