2006-08-22 15:57:13 +00:00
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<title>distance</title>
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2007-01-27 10:52:43 +00:00
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<div class="titlepage"><div><div><h4 class="title">
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<a name="fusion.iterators.metafunctions.distance"></a><a href="distance.html" title="distance">distance</a></h4></div></div></div>
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<a name="fusion.iterators.metafunctions.distance.description"></a><h5>
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<a name="id941929"></a>
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2006-08-22 15:57:13 +00:00
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<a href="distance.html#fusion.iterators.metafunctions.distance.description">Description</a>
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</h5>
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<p>
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Returns the distance between two iterators.
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</p>
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<a name="fusion.iterators.metafunctions.distance.synopsis"></a><h5>
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2007-01-27 10:52:43 +00:00
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<a name="id941957"></a>
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2006-08-22 15:57:13 +00:00
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<a href="distance.html#fusion.iterators.metafunctions.distance.synopsis">Synopsis</a>
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</h5>
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<pre class="programlisting">
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<span class="keyword">template</span><span class="special"><</span>
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<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
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<span class="keyword">typename</span> <span class="identifier">J</span>
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<span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">distance</span>
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<span class="special">{</span>
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<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
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<span class="special">};</span>
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</pre>
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2006-10-30 01:20:23 +00:00
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<div class="table">
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<a name="id942061"></a><p class="title"><b>Table<EFBFBD>1.16.<2E>Parameters</b></p>
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<table class="table" summary="Parameters">
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<colgroup>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>Parameter</th>
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<th>Requirement</th>
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<th>Description</th>
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</tr></thead>
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<tbody><tr>
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<td>
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<code class="computeroutput"><span class="identifier">I</span></code>, <code class="computeroutput"><span class="identifier">J</span></code>
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</td>
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<td>Models of <a href="../concepts/forward_iterator.html" title="Forward
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Iterator">Forward
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Iterator</a> into the same sequence</td>
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<td>The start and
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end points of the distance to be measured</td>
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</tr></tbody>
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</table>
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</div>
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<a name="fusion.iterators.metafunctions.distance.expression_semantics"></a><h5>
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2007-01-27 10:52:43 +00:00
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<a name="id942136"></a>
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2006-08-22 15:57:13 +00:00
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<a href="distance.html#fusion.iterators.metafunctions.distance.expression_semantics">Expression
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Semantics</a>
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</h5>
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<pre class="programlisting">
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<a href="distance.html" title="distance"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">distance</span></code></a><span class="special"><</span><span class="identifier">I</span><span class="special">,</span> <span class="identifier">J</span><span class="special">>::</span><span class="identifier">type</span>
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</pre>
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<p>
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<span class="bold"><strong>Return type</strong></span>: A model of MPL Integral Constant.
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</p>
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<p>
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<span class="bold"><strong>Semantics</strong></span>: Returns the distance between
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iterators of types <code class="computeroutput"><span class="identifier">I</span></code> and
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<code class="computeroutput"><span class="identifier">J</span></code>.
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</p>
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<a name="fusion.iterators.metafunctions.distance.header"></a><h5>
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2007-01-27 10:52:43 +00:00
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<a name="id942253"></a>
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<a href="distance.html#fusion.iterators.metafunctions.distance.header">Header</a>
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</h5>
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<pre class="programlisting">
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">distance</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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</pre>
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<a name="fusion.iterators.metafunctions.distance.example"></a><h5>
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2007-01-27 10:52:43 +00:00
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<a name="id942336"></a>
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2006-08-22 15:57:13 +00:00
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<a href="distance.html#fusion.iterators.metafunctions.distance.example">Example</a>
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</h5>
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<pre class="programlisting">
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<span class="keyword">typedef</span> <a href="../../sequences/containers/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">double</span><span class="special">,</span><span class="keyword">char</span><span class="special">></span> <span class="identifier">vec</span><span class="special">;</span>
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<span class="keyword">typedef</span> <a href="../../sequences/intrinsics/metafunctions/begin.html" title="begin"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></code></a><span class="special"><</span><span class="identifier">vec</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">first</span><span class="special">;</span>
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<span class="keyword">typedef</span> <a href="next.html" title="next"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></code></a><span class="special"><</span><span class="identifier">first</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">second</span><span class="special">;</span>
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<span class="keyword">typedef</span> <a href="next.html" title="next"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></code></a><span class="special"><</span><span class="identifier">second</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">third</span><span class="special">;</span>
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<span class="keyword">typedef</span> <a href="distance.html" title="distance"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">distance</span></code></a><span class="special"><</span><span class="identifier">first</span><span class="special">,</span><span class="identifier">third</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">dist</span><span class="special">;</span>
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<span class="identifier">BOOST_MPL_ASSERT_RELATION</span><span class="special">(</span><span class="identifier">dist</span><span class="special">::</span><span class="identifier">value</span><span class="special">,</span> <span class="special">==,</span> <span class="number">2</span><span class="special">);</span>
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</pre>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
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