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<a name="fusion.sequence.intrinsic.metafunctions.begin"></a><a href="begin.html" title="begin">begin</a>
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<a name="fusion.sequence.intrinsic.metafunctions.begin.description"></a><h6>
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            <a href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.description">Description</a>
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<p>
            Returns the result type of <a href="../functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a>.
          </p>
<a name="fusion.sequence.intrinsic.metafunctions.begin.synopsis"></a><h6>
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            <a href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.synopsis">Synopsis</a>
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<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Seq</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">begin</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>
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<a name="id460180"></a><p class="title"><b>Table 1.19. Parameters</b></p>
<table class="table" summary="Parameters">
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<a name="id672422"></a><p class="title"><b>Table 1.23. Parameters</b></p>
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<div class="table-contents"><table class="table" summary="Parameters">
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<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>
                  <tt class="computeroutput"><span class="identifier">Seq</span></tt>
                </p></td>
<td><p>
                  A model of <a href="../../concepts/forward_sequence.html" title="Forward
        Sequence">Forward
                  Sequence</a>
                </p></td>
<td><p>
                  Argument sequence
                </p></td>
</tr></tbody>
</table>
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            <a href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.expression_semantics">Expression
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            Semantics</a>
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<pre class="programlisting"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">&gt;::</span><span class="identifier">type</span>
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            <span class="bold"><b>Return type</b></span>: An iterator modelling the
            same traversal concept as <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
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          </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
              A model of <a class="link" href="../../../iterator/concepts/forward_iterator.html" title="Forward Iterator">Forward
              Iterator</a> if <code class="computeroutput"><span class="identifier">seq</span></code>
              is a <a class="link" href="../../concepts/forward_sequence.html" title="Forward Sequence">Forward
              Sequence</a> else, <a class="link" href="../../../iterator/concepts/bidirectional_iterator.html" title="Bidirectional Iterator">Bidirectional
              Iterator</a> if <code class="computeroutput"><span class="identifier">seq</span></code>
              is a <a class="link" href="../../concepts/bidirectional_sequence.html" title="Bidirectional Sequence">Bidirectional
              Sequence</a> else, <a class="link" href="../../../iterator/concepts/random_access_iterator.html" title="Random Access Iterator">Random
              Access Iterator</a> if <code class="computeroutput"><span class="identifier">seq</span></code>
              is a <a class="link" href="../../concepts/random_access_sequence.html" title="Random Access Sequence">Random
              Access Sequence</a>.
            </li>
<li class="listitem">
              A model of <a class="link" href="../../../iterator/concepts/associative_iterator.html" title="Associative Iterator">Associative
              Iterator</a> if <code class="computeroutput"><span class="identifier">seq</span></code>
              is an <a class="link" href="../../concepts/associative_sequence.html" title="Associative Sequence">Associative
              Sequence</a>.
            </li>
</ul></div>
<p>
            <span class="bold"><b>Semantics</b></span>: Returns the type of an iterator
            to the first element of <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
          </p>
<a name="fusion.sequence.intrinsic.metafunctions.begin.header"></a><h6>
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            <a class="link" href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.header">Header</a>
          </h6>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">sequence</span><span class="special">/</span><span class="identifier">intrinsic</span><span class="special">/</span><span class="identifier">begin</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</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">begin</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
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<a name="fusion.sequence.intrinsic.metafunctions.begin.example"></a><h6>
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<pre class="programlisting"><span class="keyword">typedef</span> <a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="begin.html" title="begin"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">it</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="../../../iterator/metafunctions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span></tt></a><span class="special">&lt;</span><span class="identifier">it</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&amp;&gt;))</span>
</pre>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2001-2007 Joel de Guzman, Dan Marsden, Tobias
      Schwinger<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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