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<title>distance</title>
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<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.metafunctions.distance"></a><a class="link" href="distance.html" title="distance">distance</a>
</h4></div></div></div>
<h6>
<a name="fusion.iterator.metafunctions.distance.h0"></a>
<span><a name="fusion.iterator.metafunctions.distance.description"></a></span><a class="link" href="distance.html#fusion.iterator.metafunctions.distance.description">Description</a>
</h6>
<p>
Returns the distance between two iterators.
</p>
<h6>
<a name="fusion.iterator.metafunctions.distance.h1"></a>
<span><a name="fusion.iterator.metafunctions.distance.synopsis"></a></span><a class="link" href="distance.html#fusion.iterator.metafunctions.distance.synopsis">Synopsis</a>
</h6>
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">J</span>
<span class="special">></span>
<span class="keyword">struct</span> <span class="identifier">distance</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="fusion.iterator.metafunctions.distance.t0"></a><p class="title"><b>Table 1.17. Parameters</b></p>
<div class="table-contents"><table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">I</span></code>, <code class="computeroutput"><span class="identifier">J</span></code>
</p>
</td>
<td>
<p>
Models of <a class="link" href="../concepts/forward_iterator.html" title="Forward Iterator">Forward
Iterator</a> into the same sequence
</p>
</td>
<td>
<p>
The start and end points of the distance to be measured
</p>
</td>
</tr></tbody>
</table></div>
</div>
<br class="table-break"><h6>
<a name="fusion.iterator.metafunctions.distance.h2"></a>
<span><a name="fusion.iterator.metafunctions.distance.expression_semantics"></a></span><a class="link" href="distance.html#fusion.iterator.metafunctions.distance.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting"><a class="link" 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>
</pre>
<p>
<span class="bold"><strong>Return type</strong></span>: A model of <a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Integral Constant</a>.
</p>
<p>
<span class="bold"><strong>Semantics</strong></span>: Returns the distance between
iterators of types <code class="computeroutput"><span class="identifier">I</span></code> and
<code class="computeroutput"><span class="identifier">J</span></code>.
</p>
<h6>
<a name="fusion.iterator.metafunctions.distance.h3"></a>
<span><a name="fusion.iterator.metafunctions.distance.header"></a></span><a class="link" href="distance.html#fusion.iterator.metafunctions.distance.header">Header</a>
</h6>
<pre class="programlisting"><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>
<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">include</span><span class="special">/</span><span class="identifier">distance</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
</pre>
<h6>
<a name="fusion.iterator.metafunctions.distance.h4"></a>
<span><a name="fusion.iterator.metafunctions.distance.example"></a></span><a class="link" href="distance.html#fusion.iterator.metafunctions.distance.example">Example</a>
</h6>
<pre class="programlisting"><span class="keyword">typedef</span> <a class="link" href="../../container/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>
<span class="keyword">typedef</span> <a class="link" href="../../sequence/intrinsic/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>
<span class="keyword">typedef</span> <a class="link" 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>
<span class="keyword">typedef</span> <a class="link" 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>
<span class="keyword">typedef</span> <a class="link" 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>
<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>
</pre>
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Dan Marsden, Tobias Schwinger<p>
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