Regenerating/reorganizing docs

[SVN r40832]
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Joel de Guzman
2007-11-06 12:13:52 +00:00
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<html>
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<title>at</title>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.functions.at"></a><a href="at.html" title="at">at</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.functions.at.description"></a><h6>
<a name="id500285"></a>
<a href="at.html#fusion.sequence.intrinsic.functions.at.description">Description</a>
</h6>
<p>
Returns the N-th element from the beginning of the sequence.
</p>
<a name="fusion.sequence.intrinsic.functions.at.synopsis"></a><h6>
<a name="id500317"></a>
<a href="at.html#fusion.sequence.intrinsic.functions.at.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">N</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/at.html" title="at"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">N</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">at</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">N</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/at.html" title="at"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">N</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">at</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.at.parameters"></a><h6>
<a name="id500647"></a>
<a href="at.html#fusion.sequence.intrinsic.functions.at.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
<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>
Model of <a href="../../concepts/random_access_sequence.html" title="Random
Access Sequence">Random
Access Sequence</a>
</p>
</td>
<td>
<p>
The sequence we wish to investigate.
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">N</span></tt>
</p>
</td>
<td>
<p>
An <a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Integral Constant</a>
</p>
</td>
<td>
<p>
An index from the beginning of the sequence.
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequence.intrinsic.functions.at.expression_semantics"></a><h6>
<a name="id500808"></a>
<a href="at.html#fusion.sequence.intrinsic.functions.at.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">at</span><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Returns a reference to
the N-th element from the beginning of the sequence <tt class="computeroutput"><span class="identifier">seq</span></tt>
if <tt class="computeroutput"><span class="identifier">seq</span></tt> is mutable and
<tt class="computeroutput"><span class="identifier">e</span> <span class="special">=</span>
<span class="identifier">o</span></tt>, where <tt class="computeroutput"><span class="identifier">e</span></tt>
is the N-th element from the beginning of the sequence, is a valid expression.
Else, returns a type convertable to the N-th element from the beginning
of the sequence.
</p>
<p>
<span class="bold"><b>Precondition</b></span>: <tt class="computeroutput"><span class="number">0</span>
<span class="special">&lt;=</span> <span class="identifier">N</span><span class="special">::</span><span class="identifier">value</span> <span class="special">&lt;</span> <a href="size.html" title="size"><tt class="computeroutput"><span class="identifier">size</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Equivalent to
</p>
<pre class="programlisting">
<a href="../../../iterator/functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="../../../iterator/functions/advance.html" title="advance"><tt class="computeroutput"><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><a href="begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)))</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.at.header"></a><h6>
<a name="id501126"></a>
<a href="at.html#fusion.sequence.intrinsic.functions.at.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">at</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">at</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.at.example"></a><h6>
<a name="id501293"></a>
<a href="at.html#fusion.sequence.intrinsic.functions.at.example">Example</a>
</h6>
<pre class="programlisting">
<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">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;</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>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">at</span><span class="special">&lt;</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">int_</span><span class="special">&lt;</span><span class="number">1</span><span class="special">&gt;</span> <span class="special">&gt;(</span><span class="identifier">v</span><span class="special">)</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger</small></td>
</tr></table>
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<html>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.functions.at_c"></a><a href="at_c.html" title="at_c">at_c</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.functions.at_c.description"></a><h6>
<a name="id501522"></a>
<a href="at_c.html#fusion.sequence.intrinsic.functions.at_c.description">Description</a>
</h6>
<p>
Returns the N-th element from the beginning of the sequence.
</p>
<a name="fusion.sequence.intrinsic.functions.at_c.synopsis"></a><h6>
<a name="id501553"></a>
<a href="at_c.html#fusion.sequence.intrinsic.functions.at_c.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">int</span> <span class="identifier">N</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/at_c.html" title="at_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_c</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">N</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">at_c</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">int</span> <span class="identifier">N</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/at_c.html" title="at_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_c</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">N</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">at_c</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.at_c.parameters"></a><h6>
<a name="id501888"></a>
<a href="at_c.html#fusion.sequence.intrinsic.functions.at_c.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
<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>
Model of <a href="../../concepts/random_access_sequence.html" title="Random
Access Sequence">Random
Access Sequence</a>
</p>
</td>
<td>
<p>
The sequence we wish to investigate.
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">N</span></tt>
</p>
</td>
<td>
<p>
An integral constant
</p>
</td>
<td>
<p>
An index from the beginning of the sequence.
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequence.intrinsic.functions.at_c.expression_semantics"></a><h6>
<a name="id502041"></a>
<a href="at_c.html#fusion.sequence.intrinsic.functions.at_c.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">at_c</span><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Returns a reference to
the N-th element from the beginning of the sequence <tt class="computeroutput"><span class="identifier">seq</span></tt>
if <tt class="computeroutput"><span class="identifier">seq</span></tt> is mutable and
<tt class="computeroutput"><span class="identifier">e</span> <span class="special">=</span>
<span class="identifier">o</span></tt>, where <tt class="computeroutput"><span class="identifier">e</span></tt>
is the N-th element from the beginning of the sequence, is a valid expression.
Else, returns a type convertable to the N-th element from the beginning
of the sequence.
</p>
<p>
<span class="bold"><b>Precondition</b></span>: <tt class="computeroutput"><span class="number">0</span>
<span class="special">&lt;=</span> <span class="identifier">N</span>
<span class="special">&lt;</span> <a href="size.html" title="size"><tt class="computeroutput"><span class="identifier">size</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Equivalent to
</p>
<pre class="programlisting">
<a href="../../../iterator/functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="../../../iterator/functions/advance.html" title="advance"><tt class="computeroutput"><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><a href="begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)))</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.at_c.header"></a><h6>
<a name="id502350"></a>
<a href="at_c.html#fusion.sequence.intrinsic.functions.at_c.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">at_c</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">at_c</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.at_c.example"></a><h6>
<a name="id502519"></a>
<a href="at_c.html#fusion.sequence.intrinsic.functions.at_c.example">Example</a>
</h6>
<pre class="programlisting">
<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">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;</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>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">at_c</span><span class="special">&lt;</span><span class="number">1</span><span class="special">&gt;(</span><span class="identifier">v</span><span class="special">)</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
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<html>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.functions.at_key"></a><a href="at_key.html" title="at_key">at_key</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.functions.at_key.description"></a><h6>
<a name="id503631"></a>
<a href="at_key.html#fusion.sequence.intrinsic.functions.at_key.description">Description</a>
</h6>
<p>
Returns the element associated with a Key from the sequence.
</p>
<a name="fusion.sequence.intrinsic.functions.at_key.synopsis"></a><h6>
<a name="id503662"></a>
<a href="at_key.html#fusion.sequence.intrinsic.functions.at_key.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Key</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_key</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">Key</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">at_key</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Key</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_key</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">Key</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">at_key</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.at_key.parameters"></a><h6>
<a name="id503995"></a>
<a href="at_key.html#fusion.sequence.intrinsic.functions.at_key.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
<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>
Model of <a href="../../concepts/associative_sequence.html" title="Associative
Sequence">Associative
Sequence</a>
</p>
</td>
<td>
<p>
The sequence we wish to investigate.
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Key</span></tt>
</p>
</td>
<td>
<p>
Any type
</p>
</td>
<td>
<p>
The queried key.
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequence.intrinsic.functions.at_key.expression_semantics"></a><h6>
<a name="id504148"></a>
<a href="at_key.html#fusion.sequence.intrinsic.functions.at_key.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">at_key</span><span class="special">&lt;</span><span class="identifier">Key</span><span class="special">&gt;(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Returns a reference to
the element associated with Key from the sequence <tt class="computeroutput"><span class="identifier">seq</span></tt>
if <tt class="computeroutput"><span class="identifier">seq</span></tt> is mutable and
<tt class="computeroutput"><span class="identifier">e</span> <span class="special">=</span>
<span class="identifier">o</span></tt>, where <tt class="computeroutput"><span class="identifier">e</span></tt>
is the element associated with Key, is a valid expression. Else, returns
a type convertable to the element associated with Key.
</p>
<p>
<span class="bold"><b>Precondition</b></span>: <tt class="computeroutput"><span class="identifier">has_key</span><span class="special">&lt;</span><span class="identifier">Key</span><span class="special">&gt;(</span><span class="identifier">seq</span><span class="special">)</span> <span class="special">==</span> <span class="keyword">true</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the element associated
with Key.
</p>
<a name="fusion.sequence.intrinsic.functions.at_key.header"></a><h6>
<a name="id504356"></a>
<a href="at_key.html#fusion.sequence.intrinsic.functions.at_key.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">at_key</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">at_key</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.at_key.example"></a><h6>
<a name="id504525"></a>
<a href="at_key.html#fusion.sequence.intrinsic.functions.at_key.example">Example</a>
</h6>
<pre class="programlisting">
<a href="../../../container/set.html" title="set"><tt class="computeroutput"><span class="identifier">set</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span><span class="special">,</span> <span class="keyword">bool</span><span class="special">&gt;</span> <span class="identifier">s</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="char">'x'</span><span class="special">,</span> <span class="keyword">true</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">at_key</span><span class="special">&lt;</span><span class="keyword">char</span><span class="special">&gt;(</span><span class="identifier">s</span><span class="special">)</span> <span class="special">==</span> <span class="char">'x'</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="has_key.html"><img src="../../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="swap.html"><img src="../../../../../../../../doc/html/images/next.png" alt="Next"></a>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.functions.back"></a><a href="back.html" title="back">back</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.functions.back.description"></a><h6>
<a name="id498534"></a>
<a href="back.html#fusion.sequence.intrinsic.functions.back.description">Description</a>
</h6>
<p>
Returns the last element in the sequence.
</p>
<a name="fusion.sequence.intrinsic.functions.back.synopsis"></a><h6>
<a name="id498565"></a>
<a href="back.html#fusion.sequence.intrinsic.functions.back.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/back.html" title="back"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">back</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">back</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/back.html" title="back"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">back</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">back</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.back.parameters"></a><h6>
<a name="id498842"></a>
<a href="back.html#fusion.sequence.intrinsic.functions.back.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
<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>
Model of <a href="../../concepts/bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a>
</p>
</td>
<td>
<p>
The sequence we wish to investigate.
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.sequence.intrinsic.functions.back.expression_semantics"></a><h6>
<a name="id498958"></a>
<a href="back.html#fusion.sequence.intrinsic.functions.back.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">back</span><span class="special">(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Returns a reference to
the last element in the sequence <tt class="computeroutput"><span class="identifier">seq</span></tt>
if <tt class="computeroutput"><span class="identifier">seq</span></tt> is mutable and
<tt class="computeroutput"><span class="identifier">e</span> <span class="special">=</span>
<span class="identifier">o</span></tt>, where <tt class="computeroutput"><span class="identifier">e</span></tt>
is the last element in the sequence, is a valid expression. Else, returns
a type convertable to the last element in the sequence.
</p>
<p>
<span class="bold"><b>Precondition</b></span>: <tt class="computeroutput"><a href="empty.html" title="empty"><tt class="computeroutput"><span class="identifier">empty</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">)</span> <span class="special">==</span> <span class="keyword">false</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the last element
in the sequence.
</p>
<a name="fusion.sequence.intrinsic.functions.back.header"></a><h6>
<a name="id499155"></a>
<a href="back.html#fusion.sequence.intrinsic.functions.back.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">back</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">back</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.back.example"></a><h6>
<a name="id499324"></a>
<a href="back.html#fusion.sequence.intrinsic.functions.back.example">Example</a>
</h6>
<pre class="programlisting">
<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">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;</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>
<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>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="front.html"><img src="../../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="size.html"><img src="../../../../../../../../doc/html/images/next.png" alt="Next"></a>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.functions.begin"></a><a href="begin.html" title="begin">begin</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.functions.begin.description"></a><h6>
<a name="id494762"></a>
<a href="begin.html#fusion.sequence.intrinsic.functions.begin.description">Description</a>
</h6>
<p>
Returns an iterator pointing to the first element in the sequence.
</p>
<a name="fusion.sequence.intrinsic.functions.begin.synopsis"></a><h6>
<a name="id494793"></a>
<a href="begin.html#fusion.sequence.intrinsic.functions.begin.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/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">Sequence</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">begin</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/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">Sequence</span> <span class="keyword">const</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">begin</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.begin.parameters"></a><h6>
<a name="id495070"></a>
<a href="begin.html#fusion.sequence.intrinsic.functions.begin.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
<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>
Model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
The sequence we wish to get an iterator from.
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.sequence.intrinsic.functions.begin.expression_semantics"></a><h6>
<a name="id495186"></a>
<a href="begin.html#fusion.sequence.intrinsic.functions.begin.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">begin</span><span class="special">(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <a href="../../../iterator/concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a> if <tt class="computeroutput"><span class="identifier">seq</span></tt>
is a <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a> else, <a href="../../../iterator/concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a> if <tt class="computeroutput"><span class="identifier">seq</span></tt>
is a <a href="../../concepts/bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a> else, <a href="../../../iterator/concepts/random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a> if <tt class="computeroutput"><span class="identifier">seq</span></tt>
is a <a href="../../concepts/random_access_sequence.html" title="Random
Access Sequence">Random
Access Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator pointing
to the first element in the sequence.
</p>
<a name="fusion.sequence.intrinsic.functions.begin.header"></a><h6>
<a name="id495356"></a>
<a href="begin.html#fusion.sequence.intrinsic.functions.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>
</pre>
<a name="fusion.sequence.intrinsic.functions.begin.example"></a><h6>
<a name="id495526"></a>
<a href="begin.html#fusion.sequence.intrinsic.functions.begin.example">Example</a>
</h6>
<pre class="programlisting">
<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">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;</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>
<span class="identifier">assert</span><span class="special">(</span><a href="../../../iterator/functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><span class="identifier">begin</span><span class="special">(</span><span class="identifier">v</span><span class="special">))</span> <span class="special">==</span> <span class="number">1</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger</small></td>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.functions.empty"></a><a href="empty.html" title="empty">empty</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.functions.empty.description"></a><h6>
<a name="id496734"></a>
<a href="empty.html#fusion.sequence.intrinsic.functions.empty.description">Description</a>
</h6>
<p>
Returns a type convertible to <tt class="computeroutput"><span class="keyword">bool</span></tt>
that evaluates to <tt class="computeroutput"><span class="keyword">true</span></tt> if
the sequence is empty, else, evaluates to <tt class="computeroutput"><span class="keyword">false</span></tt>.
</p>
<a name="fusion.sequence.intrinsic.functions.empty.synopsis"></a><h6>
<a name="id496800"></a>
<a href="empty.html#fusion.sequence.intrinsic.functions.empty.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/empty.html" title="empty"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">empty</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">empty</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.empty.parameters"></a><h6>
<a name="id496955"></a>
<a href="empty.html#fusion.sequence.intrinsic.functions.empty.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
<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>
Model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
The sequence we wish to investigate.
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.sequence.intrinsic.functions.empty.expression_semantics"></a><h6>
<a name="id497070"></a>
<a href="empty.html#fusion.sequence.intrinsic.functions.empty.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">empty</span><span class="special">(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Convertible to <tt class="computeroutput"><span class="keyword">bool</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Evaluates to <tt class="computeroutput"><span class="keyword">true</span></tt> if the sequence is empty, else, evaluates
to <tt class="computeroutput"><span class="keyword">false</span></tt>.
</p>
<a name="fusion.sequence.intrinsic.functions.empty.header"></a><h6>
<a name="id497185"></a>
<a href="empty.html#fusion.sequence.intrinsic.functions.empty.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">empty</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">empty</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.empty.example"></a><h6>
<a name="id497354"></a>
<a href="empty.html#fusion.sequence.intrinsic.functions.empty.example">Example</a>
</h6>
<pre class="programlisting">
<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">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;</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>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">empty</span><span class="special">(</span><span class="identifier">v</span><span class="special">)</span> <span class="special">==</span> <span class="keyword">false</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="end.html"><img src="../../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="front.html"><img src="../../../../../../../../doc/html/images/next.png" alt="Next"></a>
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>end</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.functions.end"></a><a href="end.html" title="end">end</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.functions.end.description"></a><h6>
<a name="id495740"></a>
<a href="end.html#fusion.sequence.intrinsic.functions.end.description">Description</a>
</h6>
<p>
Returns an iterator pointing to one element past the end of the sequence.
</p>
<a name="fusion.sequence.intrinsic.functions.end.synopsis"></a><h6>
<a name="id495771"></a>
<a href="end.html#fusion.sequence.intrinsic.functions.end.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/end.html" title="end"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">end</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">end</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/end.html" title="end"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">end</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">end</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.end.parameters"></a><h6>
<a name="id496046"></a>
<a href="end.html#fusion.sequence.intrinsic.functions.end.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
<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>
Model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
The sequence we wish to get an iterator from.
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.sequence.intrinsic.functions.end.expression_semantics"></a><h6>
<a name="id496160"></a>
<a href="end.html#fusion.sequence.intrinsic.functions.end.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">end</span><span class="special">(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <a href="../../../iterator/concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a> if <tt class="computeroutput"><span class="identifier">seq</span></tt>
is a <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a> else, <a href="../../../iterator/concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a> if <tt class="computeroutput"><span class="identifier">seq</span></tt>
is a <a href="../../concepts/bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a> else, <a href="../../../iterator/concepts/random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a> if <tt class="computeroutput"><span class="identifier">seq</span></tt>
is a <a href="../../concepts/random_access_sequence.html" title="Random
Access Sequence">Random
Access Sequence</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator pointing
to one element past the end of the sequence.
</p>
<a name="fusion.sequence.intrinsic.functions.end.header"></a><h6>
<a name="id496331"></a>
<a href="end.html#fusion.sequence.intrinsic.functions.end.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">end</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">end</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.end.example"></a><h6>
<a name="id496500"></a>
<a href="end.html#fusion.sequence.intrinsic.functions.end.example">Example</a>
</h6>
<pre class="programlisting">
<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">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;</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>
<span class="identifier">assert</span><span class="special">(</span><a href="../../../iterator/functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="../../../iterator/functions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><span class="identifier">end</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>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="begin.html"><img src="../../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="empty.html"><img src="../../../../../../../../doc/html/images/next.png" alt="Next"></a>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.functions.front"></a><a href="front.html" title="front">front</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.functions.front.description"></a><h6>
<a name="id497549"></a>
<a href="front.html#fusion.sequence.intrinsic.functions.front.description">Description</a>
</h6>
<p>
Returns the first element in the sequence.
</p>
<a name="fusion.sequence.intrinsic.functions.front.synopsis"></a><h6>
<a name="id497580"></a>
<a href="front.html#fusion.sequence.intrinsic.functions.front.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/front.html" title="front"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">front</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">front</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/front.html" title="front"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">front</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">front</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.front.parameters"></a><h6>
<a name="id497857"></a>
<a href="front.html#fusion.sequence.intrinsic.functions.front.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
<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>
Model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
The sequence we wish to investigate.
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.sequence.intrinsic.functions.front.expression_semantics"></a><h6>
<a name="id497971"></a>
<a href="front.html#fusion.sequence.intrinsic.functions.front.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">front</span><span class="special">(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Returns a reference to
the first element in the sequence <tt class="computeroutput"><span class="identifier">seq</span></tt>
if <tt class="computeroutput"><span class="identifier">seq</span></tt> is mutable and
<tt class="computeroutput"><span class="identifier">e</span> <span class="special">=</span>
<span class="identifier">o</span></tt>, where <tt class="computeroutput"><span class="identifier">e</span></tt>
is the first element in the sequence, is a valid expression. Else, returns
a type convertable to the first element in the sequence.
</p>
<p>
<span class="bold"><b>Precondition</b></span>: <tt class="computeroutput"><a href="empty.html" title="empty"><tt class="computeroutput"><span class="identifier">empty</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">)</span> <span class="special">==</span> <span class="keyword">false</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the first element
in the sequence.
</p>
<a name="fusion.sequence.intrinsic.functions.front.header"></a><h6>
<a name="id498170"></a>
<a href="front.html#fusion.sequence.intrinsic.functions.front.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">front</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">front</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.front.example"></a><h6>
<a name="id498340"></a>
<a href="front.html#fusion.sequence.intrinsic.functions.front.example">Example</a>
</h6>
<pre class="programlisting">
<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">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;</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>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">front</span><span class="special">(</span><span class="identifier">v</span><span class="special">)</span> <span class="special">==</span> <span class="number">1</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>has_key</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.functions.has_key"></a><a href="has_key.html" title="has_key">has_key</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.functions.has_key.description"></a><h6>
<a name="id502724"></a>
<a href="has_key.html#fusion.sequence.intrinsic.functions.has_key.description">Description</a>
</h6>
<p>
Returns a type convertible to <tt class="computeroutput"><span class="keyword">bool</span></tt>
that evaluates to <tt class="computeroutput"><span class="keyword">true</span></tt> if
the sequence contains an element associated with a Key, else, evaluates
to <tt class="computeroutput"><span class="keyword">false</span></tt>.
</p>
<a name="fusion.sequence.intrinsic.functions.has_key.synopsis"></a><h6>
<a name="id502792"></a>
<a href="has_key.html#fusion.sequence.intrinsic.functions.has_key.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Key</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/has_key.html" title="has_key"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">has_key</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">Key</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">has_key</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.has_key.parameters"></a><h6>
<a name="id502975"></a>
<a href="has_key.html#fusion.sequence.intrinsic.functions.has_key.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
<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>
Model of <a href="../../concepts/associative_sequence.html" title="Associative
Sequence">Associative
Sequence</a>
</p>
</td>
<td>
<p>
The sequence we wish to investigate.
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Key</span></tt>
</p>
</td>
<td>
<p>
Any type
</p>
</td>
<td>
<p>
The queried key.
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequence.intrinsic.functions.has_key.expression_semantics"></a><h6>
<a name="id503130"></a>
<a href="has_key.html#fusion.sequence.intrinsic.functions.has_key.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">has_key</span><span class="special">&lt;</span><span class="identifier">Key</span><span class="special">&gt;(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Convertible to <tt class="computeroutput"><span class="keyword">bool</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Evaluates to <tt class="computeroutput"><span class="keyword">true</span></tt> if the sequence contains an element
associated with Key, else, evaluates to <tt class="computeroutput"><span class="keyword">false</span></tt>.
</p>
<a name="fusion.sequence.intrinsic.functions.has_key.header"></a><h6>
<a name="id503255"></a>
<a href="has_key.html#fusion.sequence.intrinsic.functions.has_key.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">has_key</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">has_key</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.has_key.example"></a><h6>
<a name="id503424"></a>
<a href="has_key.html#fusion.sequence.intrinsic.functions.has_key.example">Example</a>
</h6>
<pre class="programlisting">
<a href="../../../container/set.html" title="set"><tt class="computeroutput"><span class="identifier">set</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span><span class="special">,</span> <span class="keyword">bool</span><span class="special">&gt;</span> <span class="identifier">s</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="char">'x'</span><span class="special">,</span> <span class="keyword">true</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">has_key</span><span class="special">&lt;</span><span class="keyword">char</span><span class="special">&gt;(</span><span class="identifier">s</span><span class="special">)</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger</small></td>
</tr></table>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>size</title>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.functions.size"></a><a href="size.html" title="size">size</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.functions.size.description"></a><h6>
<a name="id499519"></a>
<a href="size.html#fusion.sequence.intrinsic.functions.size.description">Description</a>
</h6>
<p>
Returns a type convertible to <tt class="computeroutput"><span class="keyword">int</span></tt>
that evaluates the number of elements in the sequence.
</p>
<a name="fusion.sequence.intrinsic.functions.size.synopsis"></a><h6>
<a name="id499564"></a>
<a href="size.html#fusion.sequence.intrinsic.functions.size.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">size</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.size.parameters"></a><h6>
<a name="id499718"></a>
<a href="size.html#fusion.sequence.intrinsic.functions.size.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
<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>
Model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
The sequence we wish to investigate.
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.sequence.intrinsic.functions.size.expression_semantics"></a><h6>
<a name="id499833"></a>
<a href="size.html#fusion.sequence.intrinsic.functions.size.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">size</span><span class="special">(</span><span class="identifier">seq</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Convertible to <tt class="computeroutput"><span class="keyword">int</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the number of elements
in the sequence.
</p>
<a name="fusion.sequence.intrinsic.functions.size.header"></a><h6>
<a name="id499923"></a>
<a href="size.html#fusion.sequence.intrinsic.functions.size.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">size</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">size</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.size.example"></a><h6>
<a name="id500092"></a>
<a href="size.html#fusion.sequence.intrinsic.functions.size.example">Example</a>
</h6>
<pre class="programlisting">
<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">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;</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>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">size</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>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger</small></td>
</tr></table>
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>swap</title>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.functions.swap"></a><a href="swap.html" title="swap">swap</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.functions.swap.description"></a><h6>
<a name="id504732"></a>
<a href="swap.html#fusion.sequence.intrinsic.functions.swap.description">Description</a>
</h6>
<p>
Performs an element by element swap of the elements in 2 sequences.
</p>
<a name="fusion.sequence.intrinsic.functions.swap.synopsis"></a><h6>
<a name="id504764"></a>
<a href="swap.html#fusion.sequence.intrinsic.functions.swap.synopsis">Synopsis</a>
</h6>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Seq1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Seq2</span><span class="special">&gt;</span>
<span class="keyword">void</span> <span class="identifier">swap</span><span class="special">(</span><span class="identifier">Seq1</span><span class="special">&amp;</span> <span class="identifier">seq1</span><span class="special">,</span> <span class="identifier">Seq2</span><span class="special">&amp;</span> <span class="identifier">seq2</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.intrinsic.functions.swap.parameters"></a><h6>
<a name="id504905"></a>
<a href="swap.html#fusion.sequence.intrinsic.functions.swap.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameters
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">seq1</span></tt>, <tt class="computeroutput"><span class="identifier">seq2</span></tt>
</p>
</td>
<td>
<p>
Models of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
The sequences whos elements we wish to swap.
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.sequence.intrinsic.functions.swap.expression_semantics"></a><h6>
<a name="id505032"></a>
<a href="swap.html#fusion.sequence.intrinsic.functions.swap.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">swap</span><span class="special">(</span><span class="identifier">seq1</span><span class="special">,</span> <span class="identifier">seq2</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">void</span></tt>
</p>
<p>
<span class="bold"><b>Precondition</b></span>: <tt class="computeroutput"><a href="size.html" title="size"><tt class="computeroutput"><span class="identifier">size</span></tt></a><span class="special">(</span><span class="identifier">seq1</span><span class="special">)</span> <span class="special">==</span> <a href="size.html" title="size"><tt class="computeroutput"><span class="identifier">size</span></tt></a><span class="special">(</span><span class="identifier">seq2</span><span class="special">)</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Calls <tt class="computeroutput"><span class="identifier">swap</span><span class="special">(</span><span class="identifier">a1</span><span class="special">,</span> <span class="identifier">b1</span><span class="special">)</span></tt> for corresponding elements in <tt class="computeroutput"><span class="identifier">seq1</span></tt> and <tt class="computeroutput"><span class="identifier">seq2</span></tt>.
</p>
<p>
/sequence/intrinsic/swap.hpp&gt;
</p>
<a name="fusion.sequence.intrinsic.functions.swap.example"></a><h6>
<a name="id505282"></a>
<a href="swap.html#fusion.sequence.intrinsic.functions.swap.example">Example</a>
</h6>
<pre class="programlisting">
<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">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&gt;</span> <span class="identifier">v1</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="string">"hello"</span><span class="special">),</span> <span class="identifier">v2</span><span class="special">(</span><span class="number">2</span><span class="special">,</span> <span class="string">"world"</span><span class="special">);</span>
<span class="identifier">swap</span><span class="special">(</span><span class="identifier">v1</span><span class="special">,</span> <span class="identifier">v2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">v1</span> <span class="special">==</span> <a href="../../../container/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">2</span><span class="special">,</span> <span class="string">"world"</span><span class="special">));</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">v2</span> <span class="special">==</span> <a href="../../../container/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="string">"hello"</span><span class="special">));</span>
</pre>
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