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56 lines
2.4 KiB
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56 lines
2.4 KiB
HTML
<!doctype html public "-//ietf//dtd html//en">
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<html><head><title>boost::mpl::distance</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>distance</h1><h3>Synopsis</h3>
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<p>
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<pre>
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template<
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typename First
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, typename Last
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>
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struct distance
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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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Finds the distance between <code>First</code> and <code>Last</code>, that is, an <a href="../Integral_Constant.html">Integral Constant</a> <code>D</code> such as <code>advance< First,D >::type</code> is identical to <code>Last</code>.
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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/distance.hpp">boost/mpl/distance.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>First</code>, <code>Last</code></td><td>A model of <a href="../Input_Iterator.html">Input Iterator</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 distance<First,Last>::type d;</code></td><td>A model of <a href="../Integral_Constant.html">Integral Constant</a></td><td><code>[First, Last)</code> is a valid range</td><td></td><td><code>is_same< advance< First,d >::type, Last >::value</code> </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 if <code>Iterator</code> is a model of <a href="../Random_Access_Iterator.html">Random Access Iterator</a>, otherwise linear 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 range_c<int,0,10>::type range;
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BOOST_STATIC_ASSERT((distance< begin<range>::type,end<range>::type >::type::value == 10));
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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="../Iterators.html">Iterators</a>, <a href="../Sequence.html">Sequence</a>, <code><a href="../Reference/advance.html">advance</a></code>, <code><a href="../Reference/begin.html">begin</a></code>, <code><a href="../Reference/end.html">end</a></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 17, 2002 6:47 am</body></html> |