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147 lines
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<link rel="home" href="../../../../index.html" title="Chapter 1. Fusion 2.0">
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<div class="section" title="back">
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<div class="titlepage"><div><div><h5 class="title">
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<a name="fusion.sequence.intrinsic.functions.back"></a><a class="link" href="back.html" title="back">back</a>
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</h5></div></div></div>
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<a name="fusion.sequence.intrinsic.functions.back.description"></a><h6>
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<a name="id704208"></a>
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<a class="link" href="back.html#fusion.sequence.intrinsic.functions.back.description">Description</a>
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</h6>
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<p>
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Returns the last element in the sequence.
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</p>
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<a name="fusion.sequence.intrinsic.functions.back.synopsis"></a><h6>
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<a name="id704225"></a>
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<a class="link" href="back.html#fusion.sequence.intrinsic.functions.back.synopsis">Synopsis</a>
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</h6>
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<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">></span>
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<span class="keyword">typename</span> <a class="link" href="../metafunctions/back.html" title="back"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">back</span></code></a><span class="special"><</span><span class="identifier">Sequence</span><span class="special">>::</span><span class="identifier">type</span>
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<span class="identifier">back</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">&</span> <span class="identifier">seq</span><span class="special">);</span>
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">></span>
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<span class="keyword">typename</span> <a class="link" href="../metafunctions/back.html" title="back"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">back</span></code></a><span class="special"><</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">>::</span><span class="identifier">type</span>
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<span class="identifier">back</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">seq</span><span class="special">);</span>
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</pre>
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<a name="fusion.sequence.intrinsic.functions.back.parameters"></a><h6>
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<a name="id704415"></a>
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<a class="link" href="back.html#fusion.sequence.intrinsic.functions.back.parameters">Parameters</a>
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</h6>
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<div class="informaltable"><table class="table">
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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>
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<p>
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Parameter
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</p>
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</th>
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<th>
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<p>
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Requirement
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</p>
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</th>
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<th>
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<p>
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Description
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</p>
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</th>
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</tr></thead>
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<tbody><tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">seq</span></code>
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</p>
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</td>
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<td>
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<p>
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Model of <a class="link" href="../../concepts/bidirectional_sequence.html" title="Bidirectional Sequence">Bidirectional
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Sequence</a>
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</p>
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</td>
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<td>
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<p>
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The sequence we wish to investigate.
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</p>
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</td>
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</tr></tbody>
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</table></div>
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<a name="fusion.sequence.intrinsic.functions.back.expression_semantics"></a><h6>
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<a name="id704505"></a>
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<a class="link" href="back.html#fusion.sequence.intrinsic.functions.back.expression_semantics">Expression
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Semantics</a>
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</h6>
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<pre class="programlisting"><span class="identifier">back</span><span class="special">(</span><span class="identifier">seq</span><span class="special">);</span>
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</pre>
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<p>
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<span class="bold"><strong>Return type</strong></span>: Returns a reference to
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the last element in the sequence <code class="computeroutput"><span class="identifier">seq</span></code>
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if <code class="computeroutput"><span class="identifier">seq</span></code> is mutable and
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<code class="computeroutput"><span class="identifier">e</span> <span class="special">=</span>
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<span class="identifier">o</span></code>, where <code class="computeroutput"><span class="identifier">e</span></code>
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is the last element in the sequence, is a valid expression. Else, returns
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a type convertable to the last element in the sequence.
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</p>
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<p>
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<span class="bold"><strong>Precondition</strong></span>: <code class="computeroutput"><a class="link" href="empty.html" title="empty"><code class="computeroutput"><span class="identifier">empty</span></code></a><span class="special">(</span><span class="identifier">seq</span><span class="special">)</span> <span class="special">==</span> <span class="keyword">false</span></code>
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</p>
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<p>
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<span class="bold"><strong>Semantics</strong></span>: Returns the last element
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in the sequence.
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</p>
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<a name="fusion.sequence.intrinsic.functions.back.header"></a><h6>
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<a name="id704636"></a>
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<a class="link" href="back.html#fusion.sequence.intrinsic.functions.back.header">Header</a>
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</h6>
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<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">sequence</span><span class="special">/</span><span class="identifier">intrinsic</span><span class="special">/</span><span class="identifier">back</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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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">include</span><span class="special">/</span><span class="identifier">back</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.sequence.intrinsic.functions.back.example"></a><h6>
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<a name="id704751"></a>
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<a class="link" href="back.html#fusion.sequence.intrinsic.functions.back.example">Example</a>
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</h6>
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<pre class="programlisting"><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">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">></span> <span class="identifier">v</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="number">2</span><span class="special">,</span> <span class="number">3</span><span class="special">);</span>
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<span class="identifier">assert</span><span class="special">(</span><span class="identifier">back</span><span class="special">(</span><span class="identifier">v</span><span class="special">)</span> <span class="special">==</span> <span class="number">3</span><span class="special">);</span>
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</pre>
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</div>
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<td align="right"><div class="copyright-footer">Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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Schwinger<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</p>
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</div></td>
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