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<div class="section" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="fusion.sequence.concepts"></a><a href="concepts.html" title="Concepts">Concepts</a></h3></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="concepts/forward_sequence.html">Forward
Sequence</a></span></dt>
<dt><span class="section"><a href="concepts/bidirectional_sequence.html">Bidirectional
Sequence</a></span></dt>
<dt><span class="section"><a href="concepts/random_access_sequence.html">Random
Access Sequence</a></span></dt>
<dt><span class="section"><a href="concepts/associative_sequence.html">Associative
Sequence</a></span></dt>
</dl></div>
<p>
Fusion Sequences are organized into a hierarchy of concepts.
</p>
<a name="fusion.sequence.concepts.traversal"></a><h4>
<a name="id487677"></a>
<a href="concepts.html#fusion.sequence.concepts.traversal">Traversal</a>
</h4>
<p>
Fusion's sequence traversal related concepts parallel Fusion's <a href="../iterator/concepts.html" title="Concepts">Iterator
Concepts</a>. <a href="concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a> is the most basic concept. <a href="concepts/bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a> is a refinement of <a href="concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>. <a href="concepts/random_access_sequence.html" title="Random
Access Sequence">Random
Access Sequence</a> is a refinement of <a href="concepts/bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a>. These concepts pertain to sequence traversal.
</p>
<a name="fusion.sequence.concepts.associativity"></a><h4>
<a name="id487763"></a>
<a href="concepts.html#fusion.sequence.concepts.associativity">Associativity</a>
</h4>
<p>
The <a href="concepts/associative_sequence.html" title="Associative
Sequence">Associative
Sequence</a> concept is orthogonal to traversal. An Associative Sequence
allows efficient retrieval of elements based on keys.
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.sequence.concepts.associative_sequence"></a><a href="associative_sequence.html" title="Associative
Sequence">Associative
Sequence</a></h4></div></div></div>
<a name="fusion.sequence.concepts.associative_sequence.description"></a><h5>
<a name="id493073"></a>
<a href="associative_sequence.html#fusion.sequence.concepts.associative_sequence.description">Description</a>
</h5>
<p>
An Associative Sequence allows efficient retrieval of elements based on
keys. Like associative sequences in <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>,
and unlike associative containers in <a href="http://en.wikipedia.org/wiki/Standard_Template_Library" target="_top">STL</a>,
Fusion associative sequences have no implied ordering relation. Instead,
type identity is used to impose an equivalence relation on keys, and the
order in which sequence elements are traversed during iteration is left
unspecified. In addition, unlike <a href="http://en.wikipedia.org/wiki/Standard_Template_Library" target="_top">STL</a>,
Associative Sequences have mutable iterators. This is due to the fact that
there is no associated ordering relation and the runtime value of the keys
themselves do not have any effect on the associativity of the sequence.
</p>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">s</span></tt></span></dt>
<dd><p>
An Associative Sequence
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">S</span></tt></span></dt>
<dd><p>
An Associative Sequence type
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">K</span></tt></span></dt>
<dd><p>
An arbitrary <span class="emphasis"><em>key</em></span> type
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">o</span></tt></span></dt>
<dd><p>
An arbitrary object
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">e</span></tt></span></dt>
<dd><p>
A Sequence element
</p></dd>
</dl>
</div>
<a name="fusion.sequence.concepts.associative_sequence.valid_expressions"></a><h5>
<a name="id493262"></a>
<a href="associative_sequence.html#fusion.sequence.concepts.associative_sequence.valid_expressions">Valid
Expressions</a>
</h5>
<p>
For any Associative Sequence the following expressions must be valid:
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Return type
</p>
</th>
<th>
<p>
Type Requirements
</p>
</th>
<th>
<p>
Runtime Complexity
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/has_key.html" title="has_key"><tt class="computeroutput"><span class="identifier">has_key</span></tt></a><span class="special">&lt;</span><span class="identifier">K</span><span class="special">&gt;(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Boolean Constant</a>. Convertible to bool.
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">at_key</span></tt></a><span class="special">&lt;</span><span class="identifier">K</span><span class="special">&gt;(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
Any type
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">at_key</span></tt></a><span class="special">&lt;</span><span class="identifier">K</span><span class="special">&gt;(</span><span class="identifier">s</span><span class="special">)</span>
<span class="special">=</span> <span class="identifier">o</span></tt>
</p>
</td>
<td>
<p>
Any type
</p>
</td>
<td>
<p>
<tt class="computeroutput"><span class="identifier">s</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.
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequence.concepts.associative_sequence.result_type_expressions"></a><h5>
<a name="id493647"></a>
<a href="associative_sequence.html#fusion.sequence.concepts.associative_sequence.result_type_expressions">Result
Type Expressions</a>
</h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Compile Time Complexity
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/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">S</span><span class="special">,</span>
<span class="identifier">K</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Amortized constant time
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/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">S</span><span class="special">,</span>
<span class="identifier">K</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Amortized constant time
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/metafunctions/value_at_key.html" title="value_at_key"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at_key</span></tt></a><span class="special">&lt;</span><span class="identifier">S</span><span class="special">,</span>
<span class="identifier">K</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Amortized constant time
</p>
</td>
</tr>
</tbody>
</table></div>
<div class="sidebar"><p>
<span class="inlinemediaobject"><img src="../../../images/note.png" alt="note"></span> <tt class="computeroutput"><a href="../intrinsic/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">S</span><span class="special">,</span> <span class="identifier">K</span><span class="special">&gt;</span></tt> returns the actual type returned by
<tt class="computeroutput"><a href="../intrinsic/functions/at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">at_key</span></tt></a><span class="special">&lt;</span><span class="identifier">K</span><span class="special">&gt;(</span><span class="identifier">s</span><span class="special">)</span></tt>. In
most cases, this is a reference. Hence, there is no way to know the exact
element type using <tt class="computeroutput"><a href="../intrinsic/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">S</span><span class="special">,</span> <span class="identifier">K</span><span class="special">&gt;</span></tt>.The element at <tt class="computeroutput"><span class="identifier">K</span></tt>
may actually be a reference to begin with. For this purpose, you can use
<tt class="computeroutput"><a href="../intrinsic/metafunctions/value_at_key.html" title="value_at_key"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at_key</span></tt></a><span class="special">&lt;</span><span class="identifier">S</span><span class="special">,</span> <span class="identifier">N</span><span class="special">&gt;</span></tt>.
</p></div>
<a name="fusion.sequence.concepts.associative_sequence.expression_semantics"></a><h5>
<a name="id494222"></a>
<a href="associative_sequence.html#fusion.sequence.concepts.associative_sequence.expression_semantics">Expression
Semantics</a>
</h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Semantics
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/has_key.html" title="has_key"><tt class="computeroutput"><span class="identifier">has_key</span></tt></a><span class="special">&lt;</span><span class="identifier">K</span><span class="special">&gt;(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
A boolean Integral Constant <tt class="computeroutput"><span class="identifier">c</span></tt>
such that <tt class="computeroutput"><span class="identifier">c</span><span class="special">::</span><span class="identifier">value</span> <span class="special">==</span>
<span class="keyword">true</span></tt> if and only if there
is one or more elements with the key <tt class="computeroutput"><span class="identifier">k</span></tt>
in <tt class="computeroutput"><span class="identifier">s</span></tt>; see <a href="../intrinsic/functions/has_key.html" title="has_key"><tt class="computeroutput"><span class="identifier">has_key</span></tt></a>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">at_key</span></tt></a><span class="special">&lt;</span><span class="identifier">K</span><span class="special">&gt;(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
The element associated with the key <tt class="computeroutput"><span class="identifier">K</span></tt>
in the sequence <tt class="computeroutput"><span class="identifier">s</span></tt>;
see <a href="../intrinsic/functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a>.
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequence.concepts.associative_sequence.models"></a><h5>
<a name="id494544"></a>
<a href="associative_sequence.html#fusion.sequence.concepts.associative_sequence.models">Models</a>
</h5>
<div class="itemizedlist"><ul type="disc">
<li><a href="../../container/set.html" title="set"><tt class="computeroutput"><span class="identifier">set</span></tt></a></li>
<li><a href="../../container/map.html" title="map"><tt class="computeroutput"><span class="identifier">map</span></tt></a></li>
</ul></div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.sequence.concepts.bidirectional_sequence"></a><a href="bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a></h4></div></div></div>
<a name="fusion.sequence.concepts.bidirectional_sequence.description"></a><h5>
<a name="id490104"></a>
<a href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.description">Description</a>
</h5>
<p>
A Bidirectional Sequence is a <a href="forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a> whose iterators model <a href="../../iterator/concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a>.
</p>
<a name="fusion.sequence.concepts.bidirectional_sequence.refinement_of"></a><h5>
<a name="id490154"></a>
<a href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.refinement_of">Refinement
of</a>
</h5>
<p>
<a href="forward_sequence.html" title="Forward
Sequence">Forward Sequence</a>
</p>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">s</span></tt></span></dt>
<dd><p>
A Forward Sequence
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">S</span></tt></span></dt>
<dd><p>
A Forward Sequence type
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">o</span></tt></span></dt>
<dd><p>
An arbitrary object
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">e</span></tt></span></dt>
<dd><p>
A Sequence element
</p></dd>
</dl>
</div>
<a name="fusion.sequence.concepts.bidirectional_sequence.valid_expressions"></a><h5>
<a name="id490294"></a>
<a href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.valid_expressions">Valid
Expressions</a>
</h5>
<p>
In addition to the requirements defined in <a href="forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>, for any Bidirectional Sequence the following must be met:
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Return type
</p>
</th>
<th>
<p>
Type Requirements
</p>
</th>
<th>
<p>
Runtime Complexity
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/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></tt>
</p>
</td>
<td>
<p>
<a href="../../iterator/concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a>
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="../../iterator/concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a>
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/back.html" title="back"><tt class="computeroutput"><span class="identifier">back</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
Any type
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/back.html" title="back"><tt class="computeroutput"><span class="identifier">back</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span>
<span class="special">=</span> <span class="identifier">o</span></tt>
</p>
</td>
<td>
<p>
Any type
</p>
</td>
<td>
<p>
<tt class="computeroutput"><span class="identifier">s</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.
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequence.concepts.bidirectional_sequence.result_type_expressions"></a><h5>
<a name="id490734"></a>
<a href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.result_type_expressions">Result
Type Expressions</a>
</h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Compile Time Complexity
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/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">S</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Amortized constant time
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/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">S</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Amortized constant time
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/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">S</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Amortized constant time
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequence.concepts.bidirectional_sequence.expression_semantics"></a><h5>
<a name="id491011"></a>
<a href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.expression_semantics">Expression
Semantics</a>
</h5>
<p>
The semantics of an expression are defined only where they differ from,
or are not defined in <a href="forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>.
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Semantics
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/back.html" title="back"><tt class="computeroutput"><span class="identifier">back</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
The last element in the sequence; see <a href="../intrinsic/functions/back.html" title="back"><tt class="computeroutput"><span class="identifier">back</span></tt></a>.
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.sequence.concepts.bidirectional_sequence.models"></a><h5>
<a name="id491164"></a>
<a href="bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.models">Models</a>
</h5>
<div class="itemizedlist"><ul type="disc">
<li><a href="../../adapted/std__pair.html" title="std::pair"><tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></tt></a></li>
<li><a href="../../adapted/boost__array.html" title="boost::array"><tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span></tt></a></li>
<li><a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a></li>
<li><a href="../../view/reverse_view.html" title="reverse_view"><tt class="computeroutput"><span class="identifier">reverse_view</span></tt></a></li>
<li>
<a href="../../view/iterator_range.html" title="iterator_range"><tt class="computeroutput"><span class="identifier">iterator_range</span></tt></a>
(where adapted sequence is a Bidirectional Sequence)
</li>
<li>
<a href="../../view/transform_view.html" title="transform_view"><tt class="computeroutput"><span class="identifier">transform_view</span></tt></a>
(where adapted sequence is a Bidirectional Sequence)
</li>
<li>
<a href="../../view/zip_view.html" title="zip_view"><tt class="computeroutput"><span class="identifier">zip_view</span></tt></a>
(where adapted sequences are models Bidirectional Sequence)
</li>
</ul></div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
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<title>Forward
Sequence</title>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.sequence.concepts.forward_sequence"></a><a href="forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a></h4></div></div></div>
<a name="fusion.sequence.concepts.forward_sequence.description"></a><h5>
<a name="id487826"></a>
<a href="forward_sequence.html#fusion.sequence.concepts.forward_sequence.description">Description</a>
</h5>
<p>
A Forward Sequence is a Sequence whose elements are arranged in a definite
order. The ordering is guaranteed not to change from iteration to iteration.
The requirement of a definite ordering allows the definition of element-by-element
equality (if the container's element type is Equality Comparable) and of
lexicographical ordering (if the container's element type is LessThan Comparable).
</p>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">s</span></tt></span></dt>
<dd><p>
A Forward Sequence
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">S</span></tt></span></dt>
<dd><p>
A Forward Sequence type
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">o</span></tt></span></dt>
<dd><p>
An arbitrary object
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">e</span></tt></span></dt>
<dd><p>
A Sequence element
</p></dd>
</dl>
</div>
<a name="fusion.sequence.concepts.forward_sequence.valid_expressions"></a><h5>
<a name="id487962"></a>
<a href="forward_sequence.html#fusion.sequence.concepts.forward_sequence.valid_expressions">Valid
Expressions</a>
</h5>
<p>
For any Forward Sequence the following expressions must be valid:
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Return type
</p>
</th>
<th>
<p>
Type Requirements
</p>
</th>
<th>
<p>
Runtime Complexity
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/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></tt>
</p>
</td>
<td>
<p>
<a href="../../iterator/concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="../../iterator/concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/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>
</td>
<td>
<p>
<a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Integral Constant</a>. Convertible to int.
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/empty.html" title="empty"><tt class="computeroutput"><span class="identifier">empty</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Boolean Constant</a>. Convertible to bool.
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/front.html" title="front"><tt class="computeroutput"><span class="identifier">front</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
Any type
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/front.html" title="front"><tt class="computeroutput"><span class="identifier">front</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span>
<span class="special">=</span> <span class="identifier">o</span></tt>
</p>
</td>
<td>
<p>
Any type
</p>
</td>
<td>
<p>
<tt class="computeroutput"><span class="identifier">s</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.
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequence.concepts.forward_sequence.result_type_expressions"></a><h5>
<a name="id488546"></a>
<a href="forward_sequence.html#fusion.sequence.concepts.forward_sequence.result_type_expressions">Result
Type Expressions</a>
</h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Compile Time Complexity
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/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">S</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Amortized constant time
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/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">S</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Amortized constant time
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/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">S</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Unspecified
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/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">S</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Constant time
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/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">S</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Amortized constant time
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequence.concepts.forward_sequence.expression_semantics"></a><h5>
<a name="id488965"></a>
<a href="forward_sequence.html#fusion.sequence.concepts.forward_sequence.expression_semantics">Expression
Semantics</a>
</h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Semantics
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/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></tt>
</p>
</td>
<td>
<p>
An iterator to the first element of the sequence; see <a href="../intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
A past-the-end iterator to the sequence; see <a href="../intrinsic/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/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>
</td>
<td>
<p>
The size of the sequence; see <a href="../intrinsic/functions/size.html" title="size"><tt class="computeroutput"><span class="identifier">size</span></tt></a>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/empty.html" title="empty"><tt class="computeroutput"><span class="identifier">empty</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
A boolean Integral Constant <tt class="computeroutput"><span class="identifier">c</span></tt>
such that <tt class="computeroutput"><span class="identifier">c</span><span class="special">::</span><span class="identifier">value</span> <span class="special">==</span>
<span class="keyword">true</span></tt> if and only if the
sequence is empty; see <a href="../intrinsic/functions/empty.html" title="empty"><tt class="computeroutput"><span class="identifier">empty</span></tt></a>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/front.html" title="front"><tt class="computeroutput"><span class="identifier">front</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
The first element in the sequence; see <a href="../intrinsic/functions/front.html" title="front"><tt class="computeroutput"><span class="identifier">front</span></tt></a>.
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequence.concepts.forward_sequence.invariants"></a><h5>
<a name="id489434"></a>
<a href="forward_sequence.html#fusion.sequence.concepts.forward_sequence.invariants">Invariants</a>
</h5>
<p>
For any Forward Sequence s the following invariants always hold:
</p>
<div class="itemizedlist"><ul type="disc">
<li>
<tt class="computeroutput"><span class="special">[</span><a href="../intrinsic/functions/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> <a href="../intrinsic/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">))</span></tt> is always a valid range.
</li>
<li>
An <a href="../../algorithm.html" title="Algorithm">Algorithm</a> that iterates through
the range <tt class="computeroutput"><span class="special">[</span><a href="../intrinsic/functions/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> <a href="../intrinsic/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">))</span></tt> will pass through every element of
<tt class="computeroutput"><span class="identifier">s</span></tt> exactly once.
</li>
<li>
<tt class="computeroutput"><a href="../intrinsic/functions/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></tt>
is identical to <tt class="computeroutput"><a href="../intrinsic/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">))</span></tt>
if and only if <tt class="computeroutput"><span class="identifier">s</span></tt> is empty.
</li>
<li>
Two different iterations through <tt class="computeroutput"><span class="identifier">s</span></tt>
will access its elements in the same order.
</li>
</ul></div>
<a name="fusion.sequence.concepts.forward_sequence.models"></a><h5>
<a name="id489746"></a>
<a href="forward_sequence.html#fusion.sequence.concepts.forward_sequence.models">Models</a>
</h5>
<div class="itemizedlist"><ul type="disc">
<li><a href="../../adapted/std__pair.html" title="std::pair"><tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></tt></a></li>
<li><a href="../../adapted/boost__array.html" title="boost::array"><tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span></tt></a></li>
<li><a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a></li>
<li><a href="../../container/cons.html" title="cons"><tt class="computeroutput"><span class="identifier">cons</span></tt></a></li>
<li><a href="../../container/list.html" title="list"><tt class="computeroutput"><span class="identifier">list</span></tt></a></li>
<li><a href="../../container/set.html" title="set"><tt class="computeroutput"><span class="identifier">set</span></tt></a></li>
<li><a href="../../container/map.html" title="map"><tt class="computeroutput"><span class="identifier">map</span></tt></a></li>
<li><a href="../../view/single_view.html" title="single_view"><tt class="computeroutput"><span class="identifier">single_view</span></tt></a></li>
<li><a href="../../view/filter_view.html" title="filter_view"><tt class="computeroutput"><span class="identifier">filter_view</span></tt></a></li>
<li><a href="../../view/iterator_range.html" title="iterator_range"><tt class="computeroutput"><span class="identifier">iterator_range</span></tt></a></li>
<li><a href="../../view/joint_view.html" title="joint_view"><tt class="computeroutput"><span class="identifier">joint_view</span></tt></a></li>
<li><a href="../../view/transform_view.html" title="transform_view"><tt class="computeroutput"><span class="identifier">transform_view</span></tt></a></li>
<li><a href="../../view/reverse_view.html" title="reverse_view"><tt class="computeroutput"><span class="identifier">reverse_view</span></tt></a></li>
<li><a href="../../view/zip_view.html" title="zip_view"><tt class="computeroutput"><span class="identifier">zip_view</span></tt></a></li>
</ul></div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.sequence.concepts.random_access_sequence"></a><a href="random_access_sequence.html" title="Random
Access Sequence">Random
Access Sequence</a></h4></div></div></div>
<a name="fusion.sequence.concepts.random_access_sequence.description"></a><h5>
<a name="id491382"></a>
<a href="random_access_sequence.html#fusion.sequence.concepts.random_access_sequence.description">Description</a>
</h5>
<p>
A Random Access Sequence is a <a href="bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a> whose iterators model <a href="../../iterator/concepts/random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a>. It guarantees constant time access to arbitrary
sequence elements.
</p>
<a name="fusion.sequence.concepts.random_access_sequence.refinement_of"></a><h5>
<a name="id491433"></a>
<a href="random_access_sequence.html#fusion.sequence.concepts.random_access_sequence.refinement_of">Refinement
of</a>
</h5>
<p>
<a href="bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a>
</p>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">s</span></tt></span></dt>
<dd><p>
A Random Access Sequence
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">S</span></tt></span></dt>
<dd><p>
A Random Access Sequence type
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">N</span></tt></span></dt>
<dd><p>
An <a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Integral Constant</a>
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">o</span></tt></span></dt>
<dd><p>
An arbitrary object
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">e</span></tt></span></dt>
<dd><p>
A Sequence element
</p></dd>
</dl>
</div>
<a name="fusion.sequence.concepts.random_access_sequence.valid_expressions"></a><h5>
<a name="id491604"></a>
<a href="random_access_sequence.html#fusion.sequence.concepts.random_access_sequence.valid_expressions">Valid
Expressions</a>
</h5>
<p>
In addition to the requirements defined in <a href="bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a>, for any Random Access Sequence the following must be met:
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Return type
</p>
</th>
<th>
<p>
Type Requirements
</p>
</th>
<th>
<p>
Runtime Complexity
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/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></tt>
</p>
</td>
<td>
<p>
<a href="../../iterator/concepts/random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a>
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="../../iterator/concepts/random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a>
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
Any type
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">s</span><span class="special">)</span>
<span class="special">=</span> <span class="identifier">o</span></tt>
</p>
</td>
<td>
<p>
Any type
</p>
</td>
<td>
<p>
<tt class="computeroutput"><span class="identifier">s</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.
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequence.concepts.random_access_sequence.result_type_expressions"></a><h5>
<a name="id492064"></a>
<a href="random_access_sequence.html#fusion.sequence.concepts.random_access_sequence.result_type_expressions">Result
Type Expressions</a>
</h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Compile Time Complexity
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/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">S</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Amortized constant time
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/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">S</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Amortized constant time
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/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">S</span><span class="special">,</span>
<span class="identifier">N</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Amortized constant time
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/metafunctions/value_at.html" title="value_at"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at</span></tt></a><span class="special">&lt;</span><span class="identifier">S</span><span class="special">,</span>
<span class="identifier">N</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Amortized constant time
</p>
</td>
</tr>
</tbody>
</table></div>
<div class="sidebar"><p>
<span class="inlinemediaobject"><img src="../../../images/note.png" alt="note"></span> <tt class="computeroutput"><a href="../intrinsic/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">S</span><span class="special">,</span> <span class="identifier">N</span><span class="special">&gt;</span></tt> returns the actual type returned by
<tt class="computeroutput"><a href="../intrinsic/functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">s</span><span class="special">)</span></tt>. In
most cases, this is a reference. Hence, there is no way to know the exact
element type using <tt class="computeroutput"><a href="../intrinsic/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">S</span><span class="special">,</span> <span class="identifier">N</span><span class="special">&gt;</span></tt>.The element at <tt class="computeroutput"><span class="identifier">N</span></tt>
may actually be a reference to begin with. For this purpose, you can use
<tt class="computeroutput"><a href="../intrinsic/metafunctions/value_at.html" title="value_at"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at</span></tt></a><span class="special">&lt;</span><span class="identifier">S</span><span class="special">,</span> <span class="identifier">N</span><span class="special">&gt;</span></tt>.
</p></div>
<a name="fusion.sequence.concepts.random_access_sequence.expression_semantics"></a><h5>
<a name="id492694"></a>
<a href="random_access_sequence.html#fusion.sequence.concepts.random_access_sequence.expression_semantics">Expression
Semantics</a>
</h5>
<p>
The semantics of an expression are defined only where they differ from,
or are not defined in <a href="bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a>.
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Semantics
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<tt class="computeroutput"><a href="../intrinsic/functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
The Nth element from the beginning of the sequence; see <a href="../intrinsic/functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a>.
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.sequence.concepts.random_access_sequence.models"></a><h5>
<a name="id492855"></a>
<a href="random_access_sequence.html#fusion.sequence.concepts.random_access_sequence.models">Models</a>
</h5>
<div class="itemizedlist"><ul type="disc">
<li><a href="../../adapted/std__pair.html" title="std::pair"><tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></tt></a></li>
<li><a href="../../adapted/boost__array.html" title="boost::array"><tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span></tt></a></li>
<li><a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a></li>
<li><a href="../../view/reverse_view.html" title="reverse_view"><tt class="computeroutput"><span class="identifier">reverse_view</span></tt></a></li>
<li>
<a href="../../view/iterator_range.html" title="iterator_range"><tt class="computeroutput"><span class="identifier">iterator_range</span></tt></a>
(where adapted sequence is a Random Access Sequence)
</li>
<li>
<a href="../../view/transform_view.html" title="transform_view"><tt class="computeroutput"><span class="identifier">transform_view</span></tt></a>
(where adapted sequence is a Random Access Sequence)
</li>
<li>
<a href="../../view/zip_view.html" title="zip_view"><tt class="computeroutput"><span class="identifier">zip_view</span></tt></a>
(where adapted sequences are models Random Access Sequence)
</li>
</ul></div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="fusion.sequence.intrinsic"></a><a href="intrinsic.html" title="Intrinsic">Intrinsic</a></h3></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="intrinsic/functions.html">Functions</a></span></dt>
<dt><span class="section"><a href="intrinsic/metafunctions.html">Metafunctions</a></span></dt>
</dl></div>
<p>
Intrinsic form the essential interface of every Fusion <a href="../sequence.html" title="Sequence">Sequence</a>.
<a href="http://en.wikipedia.org/wiki/Standard_Template_Library" target="_top">STL</a>
counterparts of these functions are usually implemented as member functions.
Intrinsic functions, unlike <a href="../algorithm.html" title="Algorithm">Algorithms</a>,
are not generic across the full <a href="../sequence.html" title="Sequence">Sequence</a>
repertoire. They need to be implemented for each Fusion <a href="../sequence.html" title="Sequence">Sequence</a>
<sup>[<a name="id494669" href="#ftn.id494669">4</a>]</sup>
.
</p>
<a name="fusion.sequence.intrinsic.header"></a><h4>
<a name="id494689"></a>
<a href="intrinsic.html#fusion.sequence.intrinsic.header">Header</a>
</h4>
<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">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">intrinsic</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<div class="footnotes">
<br><hr width="100" align="left">
<div class="footnote"><p><sup>[<a name="ftn.id494669" href="#id494669">4</a>] </sup>
In practice, many of intrinsic functions have default implementations
that will work in majority of cases
</p></div>
</div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
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<a name="fusion.sequence.intrinsic.functions"></a><a href="functions.html" title="Functions">Functions</a></h4></div></div></div>
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<dt><span class="section"><a href="functions/at.html">at</a></span></dt>
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<dt><span class="section"><a href="functions/swap.html">swap</a></span></dt>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<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="id500410"></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="id500441"></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="id500772"></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="id500932"></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="id501251"></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="id501418"></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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
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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="id501647"></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="id501678"></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="id502013"></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="id502166"></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="id502475"></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="id502644"></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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
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<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="id503756"></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="id503787"></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="id504120"></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="id504273"></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="id504480"></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="id504649"></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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
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<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="id498659"></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="id498690"></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="id498967"></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="id499082"></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="id499280"></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="id499449"></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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
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<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="id494887"></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="id494918"></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="id495194"></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="id495310"></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="id495480"></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="id495650"></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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></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="id496858"></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="id496924"></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="id497079"></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="id497194"></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="id497309"></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="id497478"></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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></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.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="id495864"></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="id495896"></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="id496171"></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="id496285"></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="id496455"></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="id496624"></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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
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<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="id497673"></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="id497704"></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="id497981"></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="id498095"></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="id498295"></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="id498464"></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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
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@ -1,159 +0,0 @@
<html>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>has_key</title>
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<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="id502849"></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="id502917"></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="id503100"></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="id503255"></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="id503380"></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="id503549"></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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
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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.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="id499644"></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="id499688"></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="id499843"></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="id499958"></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="id500048"></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="id500217"></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>
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<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<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="id504857"></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="id504889"></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="id505030"></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="id505156"></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="id505407"></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>
</div>
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<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<a name="fusion.sequence.intrinsic.metafunctions"></a><a href="metafunctions.html" title="Metafunctions">Metafunctions</a></h4></div></div></div>
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<dt><span class="section"><a href="metafunctions/begin.html">begin</a></span></dt>
<dt><span class="section"><a href="metafunctions/end.html">end</a></span></dt>
<dt><span class="section"><a href="metafunctions/empty.html">empty</a></span></dt>
<dt><span class="section"><a href="metafunctions/front.html">front</a></span></dt>
<dt><span class="section"><a href="metafunctions/back.html">back</a></span></dt>
<dt><span class="section"><a href="metafunctions/size.html">size</a></span></dt>
<dt><span class="section"><a href="metafunctions/at.html">at</a></span></dt>
<dt><span class="section"><a href="metafunctions/at_c.html">at_c</a></span></dt>
<dt><span class="section"><a href="metafunctions/value_at.html">value_at</a></span></dt>
<dt><span class="section"><a href="metafunctions/value_at_c.html">value_at_c</a></span></dt>
<dt><span class="section"><a href="metafunctions/has_key.html">has_key</a></span></dt>
<dt><span class="section"><a href="metafunctions/at_key.html">at_key</a></span></dt>
<dt><span class="section"><a href="metafunctions/value_at_key.html">value_at_key</a></span></dt>
<dt><span class="section"><a href="metafunctions/swap.html">swap</a></span></dt>
</dl></div>
</div>
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<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.metafunctions.at"></a><a href="at.html" title="at">at</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.metafunctions.at.description"></a><h6>
<a name="id509689"></a>
<a href="at.html#fusion.sequence.intrinsic.metafunctions.at.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a>
<sup>[<a name="id509727" href="#ftn.id509727">5</a>]</sup>
.
</p>
<a name="fusion.sequence.intrinsic.metafunctions.at.synopsis"></a><h6>
<a name="id509846"></a>
<a href="at.html#fusion.sequence.intrinsic.metafunctions.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">Seq</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">N</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">at</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id509963"></a><p class="title"><b>Table<EFBFBD>1.25.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Seq</span></tt>
</p>
</td>
<td>
<p>
A model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
Argument sequence
</p>
</td>
</tr>
<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>
Index of element
</p>
</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.sequence.intrinsic.metafunctions.at.expression_semantics"></a><h6>
<a name="id510107"></a>
<a href="at.html#fusion.sequence.intrinsic.metafunctions.at.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">,</span> <span class="identifier">N</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Any type.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the result type of
using <a href="../functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a> to access the <tt class="computeroutput"><span class="identifier">N</span></tt>th element of <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<p>
/sequence/intrinsic/at.hpp&gt;
</p>
<a name="fusion.sequence.intrinsic.metafunctions.at.example"></a><h6>
<a name="id510258"></a>
<a href="at.html#fusion.sequence.intrinsic.metafunctions.at.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">float</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="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">vec</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</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">type</span><span class="special">,</span> <span class="keyword">float</span><span class="special">&amp;&gt;));</span>
</pre>
<div class="footnotes">
<br><hr width="100" align="left">
<div class="footnote"><p><sup>[<a name="ftn.id509727" href="#id509727">5</a>] </sup>
<a href="at.html" title="at"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at</span></tt></a> reflects the actual return
type of the function <a href="../functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a>. <a href="../../../sequence.html" title="Sequence">Sequence</a>(s)
typically return references to its elements via the <a href="../functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a> function. If you want
to get the actual element type, use <a href="value_at.html" title="value_at"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at</span></tt></a>
</p></div>
</div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.metafunctions.at_c"></a><a href="at_c.html" title="at_c">at_c</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.metafunctions.at_c.description"></a><h6>
<a name="id510519"></a>
<a href="at_c.html#fusion.sequence.intrinsic.metafunctions.at_c.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/at_c.html" title="at_c"><tt class="computeroutput"><span class="identifier">at_c</span></tt></a>
<sup>[<a name="id510558" href="#ftn.id510558">6</a>]</sup>
.
</p>
<a name="fusion.sequence.intrinsic.metafunctions.at_c.synopsis"></a><h6>
<a name="id510681"></a>
<a href="at_c.html#fusion.sequence.intrinsic.metafunctions.at_c.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">Seq</span><span class="special">,</span>
<span class="keyword">int</span> <span class="identifier">M</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">at_c</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id510798"></a><p class="title"><b>Table<EFBFBD>1.26.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Seq</span></tt>
</p>
</td>
<td>
<p>
A model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
Argument sequence
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">M</span></tt>
</p>
</td>
<td>
<p>
Positive integer index
</p>
</td>
<td>
<p>
Index of element
</p>
</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.sequence.intrinsic.metafunctions.at_c.expression_semantics"></a><h6>
<a name="id510938"></a>
<a href="at_c.html#fusion.sequence.intrinsic.metafunctions.at_c.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_c</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">,</span> <span class="identifier">M</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Any type
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the result type of
using <a href="../functions/at_c.html" title="at_c"><tt class="computeroutput"><span class="identifier">at_c</span></tt></a> to access the <tt class="computeroutput"><span class="identifier">M</span></tt>th element of <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<p>
/sequence/intrinsic/at.hpp&gt;
</p>
<a name="fusion.sequence.intrinsic.metafunctions.at_c.example"></a><h6>
<a name="id511090"></a>
<a href="at_c.html#fusion.sequence.intrinsic.metafunctions.at_c.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">float</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="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">vec</span><span class="special">,</span> <span class="number">1</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">float</span><span class="special">&amp;&gt;));</span>
</pre>
<div class="footnotes">
<br><hr width="100" align="left">
<div class="footnote"><p><sup>[<a name="ftn.id510558" href="#id510558">6</a>] </sup>
<a href="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> reflects the actual
return type of the function <a href="../functions/at_c.html" title="at_c"><tt class="computeroutput"><span class="identifier">at_c</span></tt></a>. <a href="../../../sequence.html" title="Sequence">Sequence</a>(s)
typically return references to its elements via the <a href="../functions/at_c.html" title="at_c"><tt class="computeroutput"><span class="identifier">at_c</span></tt></a> function. If you want
to get the actual element type, use <a href="value_at_c.html" title="value_at_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at_c</span></tt></a>
</p></div>
</div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
<hr>
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<a accesskey="p" href="at.html"><img src="../../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.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="value_at.html"><img src="../../../../../../../../doc/html/images/next.png" alt="Next"></a>
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@ -1,167 +0,0 @@
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>at_key</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.metafunctions.at_key"></a><a href="at_key.html" title="at_key">at_key</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.metafunctions.at_key.description"></a><h6>
<a name="id513506"></a>
<a href="at_key.html#fusion.sequence.intrinsic.metafunctions.at_key.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">at_key</span></tt></a>
<sup>[<a name="id513545" href="#ftn.id513545">7</a>]</sup>
.
</p>
<a name="fusion.sequence.intrinsic.metafunctions.at_key.synopsis"></a><h6>
<a name="id513664"></a>
<a href="at_key.html#fusion.sequence.intrinsic.metafunctions.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">Seq</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Key</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">at_key</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id513782"></a><p class="title"><b>Table<EFBFBD>1.30.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Seq</span></tt>
</p>
</td>
<td>
<p>
A model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
Argument sequence
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Key</span></tt>
</p>
</td>
<td>
<p>
Any type
</p>
</td>
<td>
<p>
Key type
</p>
</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.sequence.intrinsic.metafunctions.at_key.expression_semantics"></a><h6>
<a name="id513921"></a>
<a href="at_key.html#fusion.sequence.intrinsic.metafunctions.at_key.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_key</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">,</span> <span class="identifier">Key</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Any type.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the result of using
<a href="../functions/at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">at_key</span></tt></a> to access the element
with key type <tt class="computeroutput"><span class="identifier">Key</span></tt> in
<tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<p>
/sequence/intrinsic/at_key.hpp&gt;
</p>
<a name="fusion.sequence.intrinsic.metafunctions.at_key.example"></a><h6>
<a name="id514073"></a>
<a href="at_key.html#fusion.sequence.intrinsic.metafunctions.at_key.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../../container/map.html" title="map"><tt class="computeroutput"><span class="identifier">map</span></tt></a><span class="special">&lt;</span><a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</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">&gt;,</span> <a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special">&lt;</span><span class="keyword">char</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;,</span> <a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special">&lt;</span><span class="keyword">double</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">mymap</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="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">mymap</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&amp;&gt;));</span>
</pre>
<div class="footnotes">
<br><hr width="100" align="left">
<div class="footnote"><p><sup>[<a name="ftn.id513545" href="#id513545">7</a>] </sup>
<a href="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> reflects the actual
return type of the function <a href="../functions/at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">at_key</span></tt></a>. <span class="underline">_sequence</span>_s
typically return references to its elements via the <a href="../functions/at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">at_key</span></tt></a> function. If you
want to get the actual element type, use <a href="value_at_key.html" title="value_at_key"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at_key</span></tt></a>
</p></div>
</div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
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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.metafunctions.back"></a><a href="back.html" title="back">back</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.metafunctions.back.description"></a><h6>
<a name="id508402"></a>
<a href="back.html#fusion.sequence.intrinsic.metafunctions.back.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/back.html" title="back"><tt class="computeroutput"><span class="identifier">back</span></tt></a>.
</p>
<a name="fusion.sequence.intrinsic.metafunctions.back.synopsis"></a><h6>
<a name="id508451"></a>
<a href="back.html#fusion.sequence.intrinsic.metafunctions.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">Seq</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">back</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id508551"></a><p class="title"><b>Table<EFBFBD>1.23.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Seq</span></tt>
</p>
</td>
<td>
<p>
A model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
Argument sequence
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.sequence.intrinsic.metafunctions.back.expression_semantics"></a><h6>
<a name="id508652"></a>
<a href="back.html#fusion.sequence.intrinsic.metafunctions.back.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">back</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Any type
</p>
<p>
<span class="bold"><b>Semantics</b></span>: The type returned by dereferencing
an iterator to the last element in the sequence. Equivalent to <tt class="computeroutput"><a href="../../../iterator/metafunctions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span></tt></a><span class="special">&lt;</span><a href="../../../iterator/metafunctions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">prior</span></tt></a><span class="special">&lt;</span><a href="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">Seq</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>.
</p>
<p>
/sequence/intrinsic/back.hpp&gt;
</p>
<a name="fusion.sequence.intrinsic.metafunctions.back.example"></a><h6>
<a name="id508885"></a>
<a href="back.html#fusion.sequence.intrinsic.metafunctions.back.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="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">vec</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&amp;&gt;));</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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.metafunctions.begin"></a><a href="begin.html" title="begin">begin</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.metafunctions.begin.description"></a><h6>
<a name="id505760"></a>
<a href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a>.
</p>
<a name="fusion.sequence.intrinsic.metafunctions.begin.synopsis"></a><h6>
<a name="id505808"></a>
<a href="begin.html#fusion.sequence.intrinsic.metafunctions.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">Seq</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">begin</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id505907"></a><p class="title"><b>Table<EFBFBD>1.19.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Seq</span></tt>
</p>
</td>
<td>
<p>
A model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
Argument sequence
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.sequence.intrinsic.metafunctions.begin.expression_semantics"></a><h6>
<a name="id506009"></a>
<a href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: An iterator modelling the
same traversal concept as <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the type of an iterator
to the first element of <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<p>
/sequence/intrinsic/begin.hpp&gt;
</p>
<a name="fusion.sequence.intrinsic.metafunctions.begin.example"></a><h6>
<a name="id506132"></a>
<a href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="begin.html" title="begin"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">it</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="../../../iterator/metafunctions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span></tt></a><span class="special">&lt;</span><span class="identifier">it</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&amp;&gt;))</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
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<a accesskey="p" href="../metafunctions.html"><img src="../../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.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="end.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.metafunctions.empty"></a><a href="empty.html" title="empty">empty</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.metafunctions.empty.description"></a><h6>
<a name="id507068"></a>
<a href="empty.html#fusion.sequence.intrinsic.metafunctions.empty.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/empty.html" title="empty"><tt class="computeroutput"><span class="identifier">empty</span></tt></a>.
</p>
<a name="fusion.sequence.intrinsic.metafunctions.empty.synopsis"></a><h6>
<a name="id507118"></a>
<a href="empty.html#fusion.sequence.intrinsic.metafunctions.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">Seq</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">empty</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id507217"></a><p class="title"><b>Table<EFBFBD>1.21.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Seq</span></tt>
</p>
</td>
<td>
<p>
A model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
Argument sequence
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.sequence.intrinsic.metafunctions.empty.expression_semantics"></a><h6>
<a name="id507319"></a>
<a href="empty.html#fusion.sequence.intrinsic.metafunctions.empty.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">empty</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: An <a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Integral Constant</a>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns <tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt>
if <tt class="computeroutput"><span class="identifier">Seq</span></tt> has zero elements,
<tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></tt> otherwise.
</p>
<p>
/sequence/intrinsic/empty.hpp&gt;
</p>
<a name="fusion.sequence.intrinsic.metafunctions.empty.example"></a><h6>
<a name="id507481"></a>
<a href="empty.html#fusion.sequence.intrinsic.metafunctions.empty.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;&gt;</span> <span class="identifier">empty_vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">float</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><a href="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">empty_vec</span><span class="special">&gt;));</span>
<span class="identifier">BOOST_MPL_ASSERT_NOT</span><span class="special">((</span><a href="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">vec</span><span class="special">&gt;));</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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.metafunctions.end"></a><a href="end.html" title="end">end</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.metafunctions.end.description"></a><h6>
<a name="id506389"></a>
<a href="end.html#fusion.sequence.intrinsic.metafunctions.end.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a>.
</p>
<a name="fusion.sequence.intrinsic.metafunctions.end.synopsis"></a><h6>
<a name="id506437"></a>
<a href="end.html#fusion.sequence.intrinsic.metafunctions.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">Seq</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">end</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id506536"></a><p class="title"><b>Table<EFBFBD>1.20.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Seq</span></tt>
</p>
</td>
<td>
<p>
A model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
Argument sequence
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.sequence.intrinsic.metafunctions.end.expression_semantics"></a><h6>
<a name="id506638"></a>
<a href="end.html#fusion.sequence.intrinsic.metafunctions.end.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">end</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of the same traversal
concept as <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the type of an iterator
one past the end of <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<p>
/sequence/intrinsic/end.hpp&gt;
</p>
<a name="fusion.sequence.intrinsic.metafunctions.end.example"></a><h6>
<a name="id506760"></a>
<a href="end.html#fusion.sequence.intrinsic.metafunctions.end.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="../../../iterator/metafunctions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">prior</span></tt></a><span class="special">&lt;</span><a href="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">vec</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">first</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><a href="../../../iterator/metafunctions/equal_to.html" title="equal_to"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">equal_to</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">,</span> <a href="begin.html" title="begin"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;))</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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.metafunctions.front"></a><a href="front.html" title="front">front</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.metafunctions.front.description"></a><h6>
<a name="id507744"></a>
<a href="front.html#fusion.sequence.intrinsic.metafunctions.front.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/front.html" title="front"><tt class="computeroutput"><span class="identifier">front</span></tt></a>.
</p>
<a name="fusion.sequence.intrinsic.metafunctions.front.synopsis"></a><h6>
<a name="id507793"></a>
<a href="front.html#fusion.sequence.intrinsic.metafunctions.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">Seq</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">front</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id507893"></a><p class="title"><b>Table<EFBFBD>1.22.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Seq</span></tt>
</p>
</td>
<td>
<p>
A model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
Argument sequence
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.sequence.intrinsic.metafunctions.front.expression_semantics"></a><h6>
<a name="id507995"></a>
<a href="front.html#fusion.sequence.intrinsic.metafunctions.front.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">front</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Any type
</p>
<p>
<span class="bold"><b>Semantics</b></span>: The type returned by dereferencing
an iterator to the first element in <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
Equivalent to <tt class="computeroutput"><a href="../../../iterator/metafunctions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span></tt></a><span class="special">&lt;</span><a href="begin.html" title="begin"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></tt></a><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>.
</p>
<p>
/sequence/intrinsic/front.hpp&gt;
</p>
<a name="fusion.sequence.intrinsic.metafunctions.front.example"></a><h6>
<a name="id508199"></a>
<a href="front.html#fusion.sequence.intrinsic.metafunctions.front.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="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">vec</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&amp;&gt;));</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
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<a accesskey="p" href="empty.html"><img src="../../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.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="back.html"><img src="../../../../../../../../doc/html/images/next.png" alt="Next"></a>
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@ -1,158 +0,0 @@
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>has_key</title>
<link rel="stylesheet" href="../../../../../../../../doc/html/boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
<link rel="up" href="../metafunctions.html" title="Metafunctions">
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.metafunctions.has_key"></a><a href="has_key.html" title="has_key">has_key</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.metafunctions.has_key.description"></a><h6>
<a name="id512671"></a>
<a href="has_key.html#fusion.sequence.intrinsic.metafunctions.has_key.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/has_key.html" title="has_key"><tt class="computeroutput"><span class="identifier">has_key</span></tt></a>.
</p>
<a name="fusion.sequence.intrinsic.metafunctions.has_key.synopsis"></a><h6>
<a name="id512720"></a>
<a href="has_key.html#fusion.sequence.intrinsic.metafunctions.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">Seq</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Key</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">has_key</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id512838"></a><p class="title"><b>Table<EFBFBD>1.29.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Seq</span></tt>
</p>
</td>
<td>
<p>
A model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
Argument sequence
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Key</span></tt>
</p>
</td>
<td>
<p>
Any type
</p>
</td>
<td>
<p>
Key type
</p>
</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.sequence.intrinsic.metafunctions.has_key.expression_semantics"></a><h6>
<a name="id512976"></a>
<a href="has_key.html#fusion.sequence.intrinsic.metafunctions.has_key.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">has_key</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">,</span> <span class="identifier">Key</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: An <a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Integral Constant</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns <tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt>
if <tt class="computeroutput"><span class="identifier">Seq</span></tt> contains an element
with key type <tt class="computeroutput"><span class="identifier">Key</span></tt>, returns
<tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></tt> otherwise.
</p>
<p>
/sequence/intrinsic/has_key.hpp&gt;
</p>
<a name="fusion.sequence.intrinsic.metafunctions.has_key.example"></a><h6>
<a name="id513160"></a>
<a href="has_key.html#fusion.sequence.intrinsic.metafunctions.has_key.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../../container/map.html" title="map"><tt class="computeroutput"><span class="identifier">map</span></tt></a><span class="special">&lt;</span><a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</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">&gt;,</span> <a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special">&lt;</span><span class="keyword">char</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;,</span> <a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special">&lt;</span><span class="keyword">double</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">mymap</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><a href="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">mymap</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;));</span>
<span class="identifier">BOOST_MPL_ASSERT_NOT</span><span class="special">((</span><a href="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">mymap</span><span class="special">,</span> <span class="keyword">void</span><span class="special">*&gt;));</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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></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>size</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.metafunctions.size"></a><a href="size.html" title="size">size</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.metafunctions.size.description"></a><h6>
<a name="id509088"></a>
<a href="size.html#fusion.sequence.intrinsic.metafunctions.size.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/size.html" title="size"><tt class="computeroutput"><span class="identifier">size</span></tt></a>.
</p>
<a name="fusion.sequence.intrinsic.metafunctions.size.synopsis"></a><h6>
<a name="id509138"></a>
<a href="size.html#fusion.sequence.intrinsic.metafunctions.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">Seq</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">size</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id509237"></a><p class="title"><b>Table<EFBFBD>1.24.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Seq</span></tt>
</p>
</td>
<td>
<p>
A model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
Argument sequence
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.sequence.intrinsic.metafunctions.size.expression_semantics"></a><h6>
<a name="id509337"></a>
<a href="size.html#fusion.sequence.intrinsic.metafunctions.size.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: An <a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Integral Constant</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the number of elements
in <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<p>
/sequence/intrinsic/size.hpp&gt;
</p>
<a name="fusion.sequence.intrinsic.metafunctions.size.example"></a><h6>
<a name="id509456"></a>
<a href="size.html#fusion.sequence.intrinsic.metafunctions.size.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">float</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="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">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">size_mpl_integral_constant</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT_RELATION</span><span class="special">(</span><span class="identifier">size_mpl_integral_constant</span><span class="special">::</span><span class="identifier">value</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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
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<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.metafunctions.swap"></a><a href="swap.html" title="swap">swap</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.metafunctions.swap.description"></a><h6>
<a name="id515155"></a>
<a href="swap.html#fusion.sequence.intrinsic.metafunctions.swap.description">Description</a>
</h6>
<p>
Returns the return type of swap.
</p>
<a name="fusion.sequence.intrinsic.metafunctions.swap.synopsis"></a><h6>
<a name="id515188"></a>
<a href="swap.html#fusion.sequence.intrinsic.metafunctions.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">struct</span> <span class="identifier">swap</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">void</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id515307"></a><p class="title"><b>Table<EFBFBD>1.32.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<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 being swapped
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.sequence.intrinsic.metafunctions.swap.expression_semantics"></a><h6>
<a name="id515422"></a>
<a href="swap.html#fusion.sequence.intrinsic.metafunctions.swap.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">swap</span><span class="special">&lt;</span><span class="identifier">Seq1</span><span class="special">,</span> <span class="identifier">Seq2</span><span class="special">&gt;::</span><span class="identifier">type</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>Semantics</b></span>: Always returns <tt class="computeroutput"><span class="keyword">void</span></tt>.
</p>
<p>
/sequence/intrinsic/swap.hpp&gt;
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
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<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.metafunctions.value_at"></a><a href="value_at.html" title="value_at">value_at</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.metafunctions.value_at.description"></a><h6>
<a name="id511315"></a>
<a href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_at.description">Description</a>
</h6>
<p>
Returns the actual type at a given index from the <a href="../../../sequence.html" title="Sequence">Sequence</a>.
</p>
<a name="fusion.sequence.intrinsic.metafunctions.value_at.synopsis"></a><h6>
<a name="id511354"></a>
<a href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_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">Seq</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">N</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">value_at</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id511472"></a><p class="title"><b>Table<EFBFBD>1.27.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Seq</span></tt>
</p>
</td>
<td>
<p>
A model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
Argument sequence
</p>
</td>
</tr>
<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>
Index of element
</p>
</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.sequence.intrinsic.metafunctions.value_at.expression_semantics"></a><h6>
<a name="id511617"></a>
<a href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_at.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">,</span> <span class="identifier">N</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Any type.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the actual type at
the <tt class="computeroutput"><span class="identifier">N</span></tt>th element of <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<p>
/sequence/intrinsic/value_at.hpp&gt;
</p>
<a name="fusion.sequence.intrinsic.metafunctions.value_at.example"></a><h6>
<a name="id511751"></a>
<a href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_at.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">float</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="value_at.html" title="value_at"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</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">type</span><span class="special">,</span> <span class="keyword">float</span><span class="special">&gt;));</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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.metafunctions.value_at_c"></a><a href="value_at_c.html" title="value_at_c">value_at_c</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.metafunctions.value_at_c.description"></a><h6>
<a name="id512014"></a>
<a href="value_at_c.html#fusion.sequence.intrinsic.metafunctions.value_at_c.description">Description</a>
</h6>
<p>
Returns the actual type at a given index from the <a href="../../../sequence.html" title="Sequence">Sequence</a>.
</p>
<a name="fusion.sequence.intrinsic.metafunctions.value_at_c.synopsis"></a><h6>
<a name="id512055"></a>
<a href="value_at_c.html#fusion.sequence.intrinsic.metafunctions.value_at_c.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">Seq</span><span class="special">,</span>
<span class="keyword">int</span> <span class="identifier">M</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">value_at_c</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id512172"></a><p class="title"><b>Table<EFBFBD>1.28.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Seq</span></tt>
</p>
</td>
<td>
<p>
A model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
Argument sequence
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">M</span></tt>
</p>
</td>
<td>
<p>
Positive integer index
</p>
</td>
<td>
<p>
Index of element
</p>
</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.sequence.intrinsic.metafunctions.value_at_c.expression_semantics"></a><h6>
<a name="id512311"></a>
<a href="value_at_c.html#fusion.sequence.intrinsic.metafunctions.value_at_c.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at_c</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">,</span> <span class="identifier">M</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Any type
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the actual type at
the <tt class="computeroutput"><span class="identifier">M</span></tt>th element of <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<p>
/sequence/intrinsic/value_at.hpp&gt;
</p>
<a name="fusion.sequence.intrinsic.metafunctions.value_at_c.example"></a><h6>
<a name="id512444"></a>
<a href="value_at_c.html#fusion.sequence.intrinsic.metafunctions.value_at_c.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">float</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="value_at_c.html" title="value_at_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at_c</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">,</span> <span class="number">1</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">float</span><span class="special">&gt;));</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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.intrinsic.metafunctions.value_at_key"></a><a href="value_at_key.html" title="value_at_key">value_at_key</a></h5></div></div></div>
<a name="fusion.sequence.intrinsic.metafunctions.value_at_key.description"></a><h6>
<a name="id514399"></a>
<a href="value_at_key.html#fusion.sequence.intrinsic.metafunctions.value_at_key.description">Description</a>
</h6>
<p>
Returns the actual element type associated with a Key from the <a href="../../../sequence.html" title="Sequence">Sequence</a>.
</p>
<a name="fusion.sequence.intrinsic.metafunctions.value_at_key.synopsis"></a><h6>
<a name="id514439"></a>
<a href="value_at_key.html#fusion.sequence.intrinsic.metafunctions.value_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">Seq</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Key</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">value_at_key</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id514557"></a><p class="title"><b>Table<EFBFBD>1.31.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Seq</span></tt>
</p>
</td>
<td>
<p>
A model of <a href="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
Argument sequence
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Key</span></tt>
</p>
</td>
<td>
<p>
Any type
</p>
</td>
<td>
<p>
Key type
</p>
</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.sequence.intrinsic.metafunctions.value_at_key.expression_semantics"></a><h6>
<a name="id514696"></a>
<a href="value_at_key.html#fusion.sequence.intrinsic.metafunctions.value_at_key.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at_key</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">,</span> <span class="identifier">Key</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Any type.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the actual element
type associated with key type <tt class="computeroutput"><span class="identifier">Key</span></tt>
in <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<p>
/sequence/intrinsic/value_at_key.hpp&gt;
</p>
<a name="fusion.sequence.intrinsic.metafunctions.value_at_key.example"></a><h6>
<a name="id514829"></a>
<a href="value_at_key.html#fusion.sequence.intrinsic.metafunctions.value_at_key.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../../container/map.html" title="map"><tt class="computeroutput"><span class="identifier">map</span></tt></a><span class="special">&lt;</span><a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</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">&gt;,</span> <a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special">&lt;</span><span class="keyword">char</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;,</span> <a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special">&lt;</span><span class="keyword">double</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">mymap</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="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">mymap</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;));</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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<div class="titlepage"><div><div><h3 class="title">
<a name="fusion.sequence.operator"></a><a href="operator.html" title="Operator">Operator</a></h3></div></div></div>
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<dt><span class="section"><a href="operator/i_o.html">I/O</a></span></dt>
<dt><span class="section"><a href="operator/comparison.html">Comparison</a></span></dt>
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<p>
These operators, like the <a href="../algorithm.html" title="Algorithm">Algorithms</a>,
work generically on all Fusion sequences. All conforming Fusion sequences
automatically get these operators for free.
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<a name="fusion.sequence.operator.comparison"></a><a href="comparison.html" title="Comparison">Comparison</a></h4></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="comparison/equal.html">equal</a></span></dt>
<dt><span class="section"><a href="comparison/not_equal.html">not
equal</a></span></dt>
<dt><span class="section"><a href="comparison/less_than.html">less
than</a></span></dt>
<dt><span class="section"><a href="comparison/less_than_equal.html">less
than equal</a></span></dt>
<dt><span class="section"><a href="comparison/greater_than.html">greater
than</a></span></dt>
<dt><span class="section"><a href="comparison/greater_than_equal.html">greater
than equal</a></span></dt>
</dl></div>
<p>
The Comparison operators: <tt class="computeroutput"><span class="special">==</span></tt>,
<tt class="computeroutput"><span class="special">!=</span></tt>, <tt class="computeroutput"><span class="special">&lt;</span></tt>,
<tt class="computeroutput"><span class="special">&lt;=</span></tt>, <tt class="computeroutput"><span class="special">&gt;=</span></tt>
and <tt class="computeroutput"><span class="special">&gt;=</span></tt> work generically
on all Fusion sequences. Comparison operators are "short- circuited":
elementary comparisons start from the first elements and are performed
only until the result is clear.
</p>
<a name="fusion.sequence.operator.comparison.header"></a><h5>
<a name="id518548"></a>
<a href="comparison.html#fusion.sequence.operator.comparison.header">Header</a>
</h5>
<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">comparison</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">comparison</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
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<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.operator.comparison.equal"></a><a href="equal.html" title="equal">equal</a></h5></div></div></div>
<a name="fusion.sequence.operator.comparison.equal.description"></a><h6>
<a name="id518726"></a>
<a href="equal.html#fusion.sequence.operator.comparison.equal.description">Description</a>
</h6>
<p>
Compare two sequences for equality.
</p>
<a name="fusion.sequence.operator.comparison.equal.synopsis"></a><h6>
<a name="id518757"></a>
<a href="equal.html#fusion.sequence.operator.comparison.equal.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">bool</span>
<span class="keyword">operator</span><span class="special">==(</span><span class="identifier">Seq1</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">Seq2</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">b</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.operator.comparison.equal.parameters"></a><h6>
<a name="id518911"></a>
<a href="equal.html#fusion.sequence.operator.comparison.equal.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">a</span><span class="special">,</span>
<span class="identifier">b</span></tt>
</p>
</td>
<td>
<p>
Instances of <a href="../../../sequence.html" title="Sequence">Sequence</a>
</p>
</td>
<td>
<p>
<a href="../../../sequence.html" title="Sequence">Sequence</a>(s) to compare
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.sequence.operator.comparison.equal.expression_semantics"></a><h6>
<a name="id519043"></a>
<a href="equal.html#fusion.sequence.operator.comparison.equal.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">a</span> <span class="special">==</span> <span class="identifier">b</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">bool</span></tt>
</p>
<p>
<span class="bold"><b>Requirements</b></span>:
</p>
<p>
For each element, <tt class="computeroutput"><span class="identifier">e1</span></tt>,
in sequence <tt class="computeroutput"><span class="identifier">a</span></tt>, and for
each element, <tt class="computeroutput"><span class="identifier">e2</span></tt>, in
sequence <tt class="computeroutput"><span class="identifier">b</span></tt>, <tt class="computeroutput"><span class="identifier">a</span> <span class="special">==</span> <span class="identifier">b</span></tt> is a valid expression returning a
type that is convertible to bool.
</p>
<p>
An attempt to compare two Sequences of different lengths results in a
compile time error.
</p>
<p>
<span class="bold"><b>Semantics</b></span>:
</p>
<p>
For each element, <tt class="computeroutput"><span class="identifier">e1</span></tt>,
in sequence <tt class="computeroutput"><span class="identifier">a</span></tt>, and for
each element, <tt class="computeroutput"><span class="identifier">e2</span></tt>, in
sequence <tt class="computeroutput"><span class="identifier">b</span></tt>, <tt class="computeroutput"><span class="identifier">e1</span> <span class="special">==</span> <span class="identifier">e2</span></tt> returns true. For any 2 zero length
<span class="underline">_sequence</span>_s, e and f, e == f returns
true.
</p>
<a name="fusion.sequence.operator.comparison.equal.header"></a><h6>
<a name="id519306"></a>
<a href="equal.html#fusion.sequence.operator.comparison.equal.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">comparison</span><span class="special">/</span><span class="identifier">equal_to</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">equal_to</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.operator.comparison.equal.example"></a><h6>
<a name="id519476"></a>
<a href="equal.html#fusion.sequence.operator.comparison.equal.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">char</span><span class="special">&gt;</span> <span class="identifier">v1</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="char">'a'</span><span class="special">);</span>
<a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">v2</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="char">'a'</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">v1</span> <span class="special">==</span> <span class="identifier">v2</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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.operator.comparison.greater_than"></a><a href="greater_than.html" title="greater
than">greater
than</a></h5></div></div></div>
<p>
Lexicographically compare two sequences.
</p>
<a name="fusion.sequence.operator.comparison.greater_than.synopsis"></a><h6>
<a name="id522661"></a>
<a href="greater_than.html#fusion.sequence.operator.comparison.greater_than.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">bool</span>
<span class="keyword">operator</span><span class="special">&gt;(</span><span class="identifier">Seq1</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">Seq2</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">b</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.operator.comparison.greater_than.parameters"></a><h6>
<a name="id522817"></a>
<a href="greater_than.html#fusion.sequence.operator.comparison.greater_than.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
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<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
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<th>
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Requirement
</p>
</th>
<th>
<p>
Description
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</tr></thead>
<tbody><tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">a</span><span class="special">,</span>
<span class="identifier">b</span></tt>
</p>
</td>
<td>
<p>
Instances of <a href="../../../sequence.html" title="Sequence">Sequence</a>
</p>
</td>
<td>
<p>
<a href="../../../sequence.html" title="Sequence">Sequence</a>(s) to compare
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.sequence.operator.comparison.greater_than.expression_semantics"></a><h6>
<a name="id522951"></a>
<a href="greater_than.html#fusion.sequence.operator.comparison.greater_than.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">a</span> <span class="special">&gt;</span> <span class="identifier">b</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">bool</span></tt>
</p>
<p>
<span class="bold"><b>Requirements</b></span>:
</p>
<p>
For each element, <tt class="computeroutput"><span class="identifier">e1</span></tt>,
in sequence <tt class="computeroutput"><span class="identifier">a</span></tt>, and for
each element, <tt class="computeroutput"><span class="identifier">e2</span></tt>, in
sequence <tt class="computeroutput"><span class="identifier">b</span></tt>, <tt class="computeroutput"><span class="identifier">a</span> <span class="special">&lt;</span> <span class="identifier">b</span></tt> is a valid expression returning a
type that is convertible to bool.
</p>
<p>
An attempt to compare two Sequences of different lengths results in a
compile time error.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns b &lt; a.
</p>
<a name="fusion.sequence.operator.comparison.greater_than.header"></a><h6>
<a name="id523130"></a>
<a href="greater_than.html#fusion.sequence.operator.comparison.greater_than.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">comparison</span><span class="special">/</span><span class="identifier">less_equal</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">less_equal</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.operator.comparison.greater_than.example"></a><h6>
<a name="id523301"></a>
<a href="greater_than.html#fusion.sequence.operator.comparison.greater_than.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">float</span><span class="special">&gt;</span> <span class="identifier">v1</span><span class="special">(</span><span class="number">4</span><span class="special">,</span> <span class="number">3.3f</span><span class="special">);</span>
<a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">short</span><span class="special">,</span> <span class="keyword">float</span><span class="special">&gt;</span> <span class="identifier">v2</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="number">3.3f</span><span class="special">);</span>
<a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">long</span><span class="special">,</span> <span class="keyword">double</span><span class="special">&gt;</span> <span class="identifier">v3</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="number">4.4</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">v2</span> <span class="special">&gt;</span> <span class="identifier">v1</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">v3</span> <span class="special">&gt;</span> <span class="identifier">v2</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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
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<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.operator.comparison.greater_than_equal"></a><a href="greater_than_equal.html" title="greater
than equal">greater
than equal</a></h5></div></div></div>
<p>
Lexicographically compare two sequences.
</p>
<a name="fusion.sequence.operator.comparison.greater_than_equal.synopsis"></a><h6>
<a name="id523648"></a>
<a href="greater_than_equal.html#fusion.sequence.operator.comparison.greater_than_equal.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">bool</span>
<span class="keyword">operator</span><span class="special">&gt;=(</span><span class="identifier">Seq1</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">Seq2</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">b</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.operator.comparison.greater_than_equal.parameters"></a><h6>
<a name="id523805"></a>
<a href="greater_than_equal.html#fusion.sequence.operator.comparison.greater_than_equal.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">a</span><span class="special">,</span>
<span class="identifier">b</span></tt>
</p>
</td>
<td>
<p>
Instances of <a href="../../../sequence.html" title="Sequence">Sequence</a>
</p>
</td>
<td>
<p>
<a href="../../../sequence.html" title="Sequence">Sequence</a>(s) to compare
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.sequence.operator.comparison.greater_than_equal.expression_semantics"></a><h6>
<a name="id523939"></a>
<a href="greater_than_equal.html#fusion.sequence.operator.comparison.greater_than_equal.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">a</span> <span class="special">&gt;=</span> <span class="identifier">b</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">bool</span></tt>
</p>
<p>
<span class="bold"><b>Requirements</b></span>:
</p>
<p>
For each element, <tt class="computeroutput"><span class="identifier">e1</span></tt>,
in sequence <tt class="computeroutput"><span class="identifier">a</span></tt>, and for
each element, <tt class="computeroutput"><span class="identifier">e2</span></tt>, in
sequence <tt class="computeroutput"><span class="identifier">b</span></tt>, <tt class="computeroutput"><span class="identifier">a</span> <span class="special">&lt;</span> <span class="identifier">b</span></tt> is a valid expression returning a
type that is convertible to bool.
</p>
<p>
An attempt to compare two Sequences of different lengths results in a
compile time error.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns !(a &lt; b).
</p>
<a name="fusion.sequence.operator.comparison.greater_than_equal.header"></a><h6>
<a name="id524119"></a>
<a href="greater_than_equal.html#fusion.sequence.operator.comparison.greater_than_equal.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">comparison</span><span class="special">/</span><span class="identifier">greater_equal</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">greater_equal</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.operator.comparison.greater_than_equal.example"></a><h6>
<a name="id524290"></a>
<a href="greater_than_equal.html#fusion.sequence.operator.comparison.greater_than_equal.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">float</span><span class="special">&gt;</span> <span class="identifier">v1</span><span class="special">(</span><span class="number">4</span><span class="special">,</span> <span class="number">3.3f</span><span class="special">);</span>
<a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">short</span><span class="special">,</span> <span class="keyword">float</span><span class="special">&gt;</span> <span class="identifier">v2</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="number">3.3f</span><span class="special">);</span>
<a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">long</span><span class="special">,</span> <span class="keyword">double</span><span class="special">&gt;</span> <span class="identifier">v3</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="number">4.4</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">v2</span> <span class="special">&gt;=</span> <span class="identifier">v1</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">v3</span> <span class="special">&gt;=</span> <span class="identifier">v2</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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.operator.comparison.less_than"></a><a href="less_than.html" title="less
than">less
than</a></h5></div></div></div>
<p>
Lexicographically compare two sequences.
</p>
<a name="fusion.sequence.operator.comparison.less_than.synopsis"></a><h6>
<a name="id520662"></a>
<a href="less_than.html#fusion.sequence.operator.comparison.less_than.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">bool</span>
<span class="keyword">operator</span><span class="special">&lt;(</span><span class="identifier">Seq1</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">Seq2</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">b</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.operator.comparison.less_than.parameters"></a><h6>
<a name="id520816"></a>
<a href="less_than.html#fusion.sequence.operator.comparison.less_than.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">a</span><span class="special">,</span>
<span class="identifier">b</span></tt>
</p>
</td>
<td>
<p>
Instances of <a href="../../../sequence.html" title="Sequence">Sequence</a>
</p>
</td>
<td>
<p>
<a href="../../../sequence.html" title="Sequence">Sequence</a>(s) to compare
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.sequence.operator.comparison.less_than.expression_semantics"></a><h6>
<a name="id520950"></a>
<a href="less_than.html#fusion.sequence.operator.comparison.less_than.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">a</span> <span class="special">&lt;</span> <span class="identifier">b</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">bool</span></tt>
</p>
<p>
<span class="bold"><b>Requirements</b></span>:
</p>
<p>
For each element, <tt class="computeroutput"><span class="identifier">e1</span></tt>,
in sequence <tt class="computeroutput"><span class="identifier">a</span></tt>, and for
each element, <tt class="computeroutput"><span class="identifier">e2</span></tt>, in
sequence <tt class="computeroutput"><span class="identifier">b</span></tt>, <tt class="computeroutput"><span class="identifier">a</span> <span class="special">&lt;</span> <span class="identifier">b</span></tt> is a valid expression returning a
type that is convertible to bool.
</p>
<p>
An attempt to compare two Sequences of different lengths results in a
compile time error.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the lexicographical
comparison of between <tt class="computeroutput"><span class="identifier">a</span></tt>
and <tt class="computeroutput"><span class="identifier">b</span></tt>.
</p>
<a name="fusion.sequence.operator.comparison.less_than.header"></a><h6>
<a name="id521153"></a>
<a href="less_than.html#fusion.sequence.operator.comparison.less_than.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">comparison</span><span class="special">/</span><span class="identifier">less</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">less</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.operator.comparison.less_than.example"></a><h6>
<a name="id521323"></a>
<a href="less_than.html#fusion.sequence.operator.comparison.less_than.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">float</span><span class="special">&gt;</span> <span class="identifier">v1</span><span class="special">(</span><span class="number">4</span><span class="special">,</span> <span class="number">3.3f</span><span class="special">);</span>
<a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">short</span><span class="special">,</span> <span class="keyword">float</span><span class="special">&gt;</span> <span class="identifier">v2</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="number">3.3f</span><span class="special">);</span>
<a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">long</span><span class="special">,</span> <span class="keyword">double</span><span class="special">&gt;</span> <span class="identifier">v3</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="number">4.4</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">v1</span> <span class="special">&lt;</span> <span class="identifier">v2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">v2</span> <span class="special">&lt;</span> <span class="identifier">v3</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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
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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.operator.comparison.less_than_equal"></a><a href="less_than_equal.html" title="less
than equal">less
than equal</a></h5></div></div></div>
<p>
Lexicographically compare two sequences.
</p>
<a name="fusion.sequence.operator.comparison.less_than_equal.synopsis"></a><h6>
<a name="id521671"></a>
<a href="less_than_equal.html#fusion.sequence.operator.comparison.less_than_equal.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">bool</span>
<span class="keyword">operator</span><span class="special">&lt;=(</span><span class="identifier">Seq1</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">Seq2</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">b</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.operator.comparison.less_than_equal.parameters"></a><h6>
<a name="id521826"></a>
<a href="less_than_equal.html#fusion.sequence.operator.comparison.less_than_equal.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">a</span><span class="special">,</span>
<span class="identifier">b</span></tt>
</p>
</td>
<td>
<p>
Instances of <a href="../../../sequence.html" title="Sequence">Sequence</a>
</p>
</td>
<td>
<p>
<a href="../../../sequence.html" title="Sequence">Sequence</a>(s) to compare
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.sequence.operator.comparison.less_than_equal.expression_semantics"></a><h6>
<a name="id521961"></a>
<a href="less_than_equal.html#fusion.sequence.operator.comparison.less_than_equal.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">a</span> <span class="special">&lt;=</span> <span class="identifier">b</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">bool</span></tt>
</p>
<p>
<span class="bold"><b>Requirements</b></span>:
</p>
<p>
For each element, <tt class="computeroutput"><span class="identifier">e1</span></tt>,
in sequence <tt class="computeroutput"><span class="identifier">a</span></tt>, and for
each element, <tt class="computeroutput"><span class="identifier">e2</span></tt>, in
sequence <tt class="computeroutput"><span class="identifier">b</span></tt>, <tt class="computeroutput"><span class="identifier">a</span> <span class="special">&lt;</span> <span class="identifier">b</span></tt> is a valid expression returning a
type that is convertible to bool.
</p>
<p>
An attempt to compare two Sequences of different lengths results in a
compile time error.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns !(b &lt; a).
</p>
<a name="fusion.sequence.operator.comparison.less_than_equal.header"></a><h6>
<a name="id522141"></a>
<a href="less_than_equal.html#fusion.sequence.operator.comparison.less_than_equal.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">comparison</span><span class="special">/</span><span class="identifier">less_equal</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">less_equal</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.operator.comparison.less_than_equal.example"></a><h6>
<a name="id522312"></a>
<a href="less_than_equal.html#fusion.sequence.operator.comparison.less_than_equal.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">float</span><span class="special">&gt;</span> <span class="identifier">v1</span><span class="special">(</span><span class="number">4</span><span class="special">,</span> <span class="number">3.3f</span><span class="special">);</span>
<a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">short</span><span class="special">,</span> <span class="keyword">float</span><span class="special">&gt;</span> <span class="identifier">v2</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="number">3.3f</span><span class="special">);</span>
<a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">long</span><span class="special">,</span> <span class="keyword">double</span><span class="special">&gt;</span> <span class="identifier">v3</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="number">4.4</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">v1</span> <span class="special">&lt;=</span> <span class="identifier">v2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">v2</span> <span class="special">&lt;=</span> <span class="identifier">v3</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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
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@ -1,155 +0,0 @@
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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equal</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.operator.comparison.not_equal"></a><a href="not_equal.html" title="not
equal">not
equal</a></h5></div></div></div>
<p>
Compare two sequences for inequality.
</p>
<a name="fusion.sequence.operator.comparison.not_equal.synopsis"></a><h6>
<a name="id519715"></a>
<a href="not_equal.html#fusion.sequence.operator.comparison.not_equal.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">bool</span>
<span class="keyword">operator</span><span class="special">!=(</span><span class="identifier">Seq1</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">Seq2</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">b</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.operator.comparison.not_equal.parameters"></a><h6>
<a name="id519870"></a>
<a href="not_equal.html#fusion.sequence.operator.comparison.not_equal.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">a</span><span class="special">,</span>
<span class="identifier">b</span></tt>
</p>
</td>
<td>
<p>
Instances of <a href="../../../sequence.html" title="Sequence">Sequence</a>
</p>
</td>
<td>
<p>
<a href="../../../sequence.html" title="Sequence">Sequence</a>(s) to compare
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.sequence.operator.comparison.not_equal.expression_semantics"></a><h6>
<a name="id520004"></a>
<a href="not_equal.html#fusion.sequence.operator.comparison.not_equal.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">a</span> <span class="special">!=</span> <span class="identifier">b</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">bool</span></tt>
</p>
<p>
<span class="bold"><b>Requirements</b></span>:
</p>
<p>
For each element, <tt class="computeroutput"><span class="identifier">e1</span></tt>,
in sequence <tt class="computeroutput"><span class="identifier">a</span></tt>, and for
each element, <tt class="computeroutput"><span class="identifier">e2</span></tt>, in
sequence <tt class="computeroutput"><span class="identifier">b</span></tt>, <tt class="computeroutput"><span class="identifier">a</span> <span class="special">==</span> <span class="identifier">b</span></tt> is a valid expression returning a
type that is convertible to bool.
</p>
<p>
An attempt to compare two Sequences of different lengths results in a
compile time error.
</p>
<p>
<span class="bold"><b>Semantics</b></span>:
</p>
<p>
Returns !(a == b).
</p>
<a name="fusion.sequence.operator.comparison.not_equal.header"></a><h6>
<a name="id520188"></a>
<a href="not_equal.html#fusion.sequence.operator.comparison.not_equal.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">comparison</span><span class="special">/</span><span class="identifier">not_equal_to</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">not_equal_to</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.operator.comparison.not_equal.example"></a><h6>
<a name="id520357"></a>
<a href="not_equal.html#fusion.sequence.operator.comparison.not_equal.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">char</span><span class="special">&gt;</span> <span class="identifier">v3</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="char">'b'</span><span class="special">);</span>
<a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">t4</span><span class="special">(</span><span class="number">2</span><span class="special">,</span> <span class="char">'a'</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">v1</span> <span class="special">!=</span> <span class="identifier">v3</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">v1</span> <span class="special">!=</span> <span class="identifier">t4</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(!(</span><span class="identifier">v1</span> <span class="special">!=</span> <span class="identifier">v2</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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>I/O</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><h4 class="title">
<a name="fusion.sequence.operator.i_o"></a><a href="i_o.html" title="I/O">I/O</a></h4></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="i_o/in.html">in</a></span></dt>
<dt><span class="section"><a href="i_o/out.html">out</a></span></dt>
</dl></div>
<p>
The I/O operators: <tt class="computeroutput"><span class="special">&lt;&lt;</span></tt>
and <tt class="computeroutput"><span class="special">&gt;&gt;</span></tt> work generically
on all Fusion sequences. The global <tt class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;&lt;</span></tt> has been overloaded for generic
output streams such that <a href="../../sequence.html" title="Sequence">Sequence</a>(s)
are output by recursively calling <tt class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;&lt;</span></tt> for each element. Analogously,
the global <tt class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;&gt;</span></tt>
has been overloaded to extract <a href="../../sequence.html" title="Sequence">Sequence</a>(s)
from generic input streams by recursively calling <tt class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;&gt;</span></tt> for each element.
</p>
<p>
The default delimiter between the elements is space, and the <a href="../../sequence.html" title="Sequence">Sequence</a>
is enclosed in parenthesis. For Example:
</p>
<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">float</span><span class="special">,</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">a</span><span class="special">(</span><span class="number">1.0f</span><span class="special">,</span> <span class="number">2</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="string">"Howdy folks!"</span><span class="special">);</span>
<span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">a</span><span class="special">;</span>
</pre>
<p>
outputs the <a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>
as: (1.0 2 Howdy folks!)
</p>
<p>
The library defines three manipulators for changing the default behavior:
</p>
<div class="variablelist">
<p class="title"><b>Manipulators</b></p>
<dl>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">tuple_open</span><span class="special">(</span><span class="identifier">arg</span><span class="special">)</span></tt></span></dt>
<dd><p>
Defines the character that is output before the first element.
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">tuple_close</span><span class="special">(</span><span class="identifier">arg</span><span class="special">)</span></tt></span></dt>
<dd><p>
Defines the character that is output after the last element.
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">tuple_delimiter</span><span class="special">(</span><span class="identifier">arg</span><span class="special">)</span></tt></span></dt>
<dd><p>
Defines the delimiter character between elements.
</p></dd>
</dl>
</div>
<p>
The argument to <tt class="computeroutput"><span class="identifier">tuple_open</span></tt>,
<tt class="computeroutput"><span class="identifier">tuple_close</span></tt> and <tt class="computeroutput"><span class="identifier">tuple_delimiter</span></tt> may be a <tt class="computeroutput"><span class="keyword">char</span></tt>, <tt class="computeroutput"><span class="keyword">wchar_t</span></tt>,
a C-string, or a wide C-string.
</p>
<p>
Example:
</p>
<pre class="programlisting">
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">tuple_open</span><span class="special">(</span><span class="char">'['</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">tuple_close</span><span class="special">(</span><span class="char">']'</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">tuple_delimiter</span><span class="special">(</span><span class="string">", "</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">a</span><span class="special">;</span>
</pre>
<p>
outputs the same <a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>, <tt class="computeroutput"><span class="identifier">a</span></tt>
as: [1.0, 2, Howdy folks!]
</p>
<p>
The same manipulators work with <tt class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;&gt;</span></tt> and <tt class="computeroutput"><span class="identifier">istream</span></tt>
as well. Suppose the <tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">cin</span></tt>
stream contains the following data:
</p>
<pre class="programlisting">
<span class="special">(</span><span class="number">1</span> <span class="number">2</span> <span class="number">3</span><span class="special">)</span> <span class="special">[</span><span class="number">4</span><span class="special">:</span><span class="number">5</span><span class="special">]</span>
</pre>
<p>
The code:
</p>
<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">i</span><span class="special">;</span>
<a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">j</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cin</span> <span class="special">&gt;&gt;</span> <span class="identifier">i</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cin</span> <span class="special">&gt;&gt;</span> <span class="identifier">set_open</span><span class="special">(</span><span class="char">'['</span><span class="special">)</span> <span class="special">&gt;&gt;</span> <span class="identifier">set_close</span><span class="special">(</span><span class="char">']'</span><span class="special">)</span> <span class="special">&gt;&gt;</span> <span class="identifier">set_delimiter</span><span class="special">(</span><span class="char">':'</span><span class="special">);</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cin</span> <span class="special">&gt;&gt;</span> <span class="identifier">j</span><span class="special">;</span>
</pre>
<p>
reads the data into the <a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>(s) <tt class="computeroutput"><span class="identifier">i</span></tt>
and <tt class="computeroutput"><span class="identifier">j</span></tt>.
</p>
<p>
Note that extracting <a href="../../sequence.html" title="Sequence">Sequence</a>(s)
with <tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></tt> or C-style string elements does
not generally work, since the streamed <a href="../../sequence.html" title="Sequence">Sequence</a>
representation may not be unambiguously parseable.
</p>
<a name="fusion.sequence.operator.i_o.header"></a><h5>
<a name="id516765"></a>
<a href="i_o.html#fusion.sequence.operator.i_o.header">Header</a>
</h5>
<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">io</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">io</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
</div>
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<td align="right"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.operator.i_o.in"></a><a href="in.html" title="in">in</a></h5></div></div></div>
<a name="fusion.sequence.operator.i_o.in.description"></a><h6>
<a name="id516943"></a>
<a href="in.html#fusion.sequence.operator.i_o.in.description">Description</a>
</h6>
<p>
Read a <a href="../../../sequence.html" title="Sequence">Sequence</a> from an input
stream.
</p>
<a name="fusion.sequence.operator.i_o.in.synopsis"></a><h6>
<a name="id516982"></a>
<a href="in.html#fusion.sequence.operator.i_o.in.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">IStream</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="identifier">IStream</span><span class="special">&amp;</span>
<span class="keyword">operator</span><span class="special">&gt;&gt;(</span><span class="identifier">IStream</span><span class="special">&amp;</span> <span class="identifier">is</span><span class="special">,</span> <span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.operator.i_o.in.parameters"></a><h6>
<a name="id517128"></a>
<a href="in.html#fusion.sequence.operator.i_o.in.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>
is
</p>
</td>
<td>
<p>
An input stream.
</p>
</td>
<td>
<p>
Stream to extract information from.
</p>
</td>
</tr>
<tr>
<td>
<p>
seq
</p>
</td>
<td>
<p>
A <a href="../../../sequence.html" title="Sequence">Sequence</a>.
</p>
</td>
<td>
<p>
The sequence to read.
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequence.operator.i_o.in.expression_semantics"></a><h6>
<a name="id517259"></a>
<a href="in.html#fusion.sequence.operator.i_o.in.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">is</span> <span class="special">&gt;&gt;</span> <span class="identifier">seq</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: IStream&amp;
</p>
<p>
<span class="bold"><b>Semantics</b></span>: For each element, <tt class="computeroutput"><span class="identifier">e</span></tt>, in sequence, <tt class="computeroutput"><span class="identifier">seq</span></tt>,
call <tt class="computeroutput"><span class="identifier">is</span> <span class="special">&gt;&gt;</span>
<span class="identifier">e</span></tt>.
</p>
<a name="fusion.sequence.operator.i_o.in.header"></a><h6>
<a name="id517379"></a>
<a href="in.html#fusion.sequence.operator.i_o.in.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">io</span><span class="special">/</span><span class="identifier">in</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">in</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.operator.i_o.in.example"></a><h6>
<a name="id517546"></a>
<a href="in.html#fusion.sequence.operator.i_o.in.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">,</span> <span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">v</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cin</span> <span class="special">&gt;&gt;</span> <span class="identifier">v</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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
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<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.operator.i_o.out"></a><a href="out.html" title="out">out</a></h5></div></div></div>
<a name="fusion.sequence.operator.i_o.out.description"></a><h6>
<a name="id517707"></a>
<a href="out.html#fusion.sequence.operator.i_o.out.description">Description</a>
</h6>
<p>
Write a <a href="../../../sequence.html" title="Sequence">Sequence</a> to an output
stream.
</p>
<a name="fusion.sequence.operator.i_o.out.synopsis"></a><h6>
<a name="id517746"></a>
<a href="out.html#fusion.sequence.operator.i_o.out.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">OStream</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">&gt;</span>
<span class="identifier">OStream</span><span class="special">&amp;</span>
<span class="keyword">operator</span><span class="special">&lt;&lt;(</span><span class="identifier">OStream</span><span class="special">&amp;</span> <span class="identifier">os</span><span class="special">,</span> <span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.operator.i_o.out.parameters"></a><h6>
<a name="id517893"></a>
<a href="out.html#fusion.sequence.operator.i_o.out.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>
os
</p>
</td>
<td>
<p>
An output stream.
</p>
</td>
<td>
<p>
Stream to write information to.
</p>
</td>
</tr>
<tr>
<td>
<p>
seq
</p>
</td>
<td>
<p>
A <a href="../../../sequence.html" title="Sequence">Sequence</a>.
</p>
</td>
<td>
<p>
The sequence to write.
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequence.operator.i_o.out.expression_semantics"></a><h6>
<a name="id518023"></a>
<a href="out.html#fusion.sequence.operator.i_o.out.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">os</span> <span class="special">&lt;&lt;</span> <span class="identifier">seq</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: OStream&amp;
</p>
<p>
<span class="bold"><b>Semantics</b></span>: For each element, <tt class="computeroutput"><span class="identifier">e</span></tt>, in sequence, <tt class="computeroutput"><span class="identifier">seq</span></tt>,
call <tt class="computeroutput"><span class="identifier">os</span> <span class="special">&lt;&lt;</span>
<span class="identifier">e</span></tt>.
</p>
<a name="fusion.sequence.operator.i_o.out.header"></a><h6>
<a name="id518143"></a>
<a href="out.html#fusion.sequence.operator.i_o.out.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">io</span><span class="special">/</span><span class="identifier">out</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">out</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.operator.i_o.out.example"></a><h6>
<a name="id518312"></a>
<a href="out.html#fusion.sequence.operator.i_o.out.example">Example</a>
</h6>
<pre class="programlisting">
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</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">123</span><span class="special">,</span> <span class="string">"Hello"</span><span class="special">,</span> <span class="char">'x'</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</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"><div class="copyright-footer">Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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