Full merge from trunk at revision 41356 of entire boost-root tree.

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Beman Dawes
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<div class="titlepage"><div><div><h3 class="title">
<a name="fusion.iterator.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_iterator.html">Forward
Iterator</a></span></dt>
<dt><span class="section"><a href="concepts/bidirectional_iterator.html">Bidirectional
Iterator</a></span></dt>
<dt><span class="section"><a href="concepts/random_access_iterator.html">Random
Access Iterator</a></span></dt>
</dl></div>
<p>
Fusion iterators are divided into different traversal categories. <a href="concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a> is the most basic concept. <a href="concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a> is a refinement of <a href="concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>. <a href="concepts/random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a> is a refinement of <a href="concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a>.
</p>
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<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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<html>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.concepts.bidirectional_iterator"></a><a href="bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a></h4></div></div></div>
<a name="fusion.iterator.concepts.bidirectional_iterator.description"></a><h5>
<a name="id471174"></a>
<a href="bidirectional_iterator.html#fusion.iterator.concepts.bidirectional_iterator.description">Description</a>
</h5>
<p>
A Bidirectional Iterator traverses a <a href="../../sequence.html" title="Sequence">Sequence</a>
allowing movement in either direction one element at a time.
</p>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">i</span></tt></span></dt>
<dd><p>
A Bidirectional Iterator
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">I</span></tt></span></dt>
<dd><p>
A Bidirectional Iterator type
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">M</span></tt></span></dt>
<dd><p>
An <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>
integral constant
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">N</span></tt></span></dt>
<dd><p>
An integral constant
</p></dd>
</dl>
</div>
<a name="fusion.iterator.concepts.bidirectional_iterator.refinement_of"></a><h5>
<a name="id471322"></a>
<a href="bidirectional_iterator.html#fusion.iterator.concepts.bidirectional_iterator.refinement_of">Refinement
of</a>
</h5>
<p>
<a href="forward_iterator.html" title="Forward
Iterator">Forward Iterator</a>
</p>
<a name="fusion.iterator.concepts.bidirectional_iterator.expression_requirements"></a><h5>
<a name="id471362"></a>
<a href="bidirectional_iterator.html#fusion.iterator.concepts.bidirectional_iterator.expression_requirements">Expression
requirements</a>
</h5>
<p>
In addition to the requirements defined in <a href="forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>, the following expressions must be valid:
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Return type
</p>
</th>
<th>
<p>
Runtime Complexity
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../functions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../functions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../functions/advance.html" title="advance"><tt class="computeroutput"><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">M</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.iterator.concepts.bidirectional_iterator.meta_expressions"></a><h5>
<a name="id471745"></a>
<a href="bidirectional_iterator.html#fusion.iterator.concepts.bidirectional_iterator.meta_expressions">Meta
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="../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><span class="identifier">I</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.iterator.concepts.bidirectional_iterator.expression_semantics"></a><h5>
<a name="id471881"></a>
<a href="bidirectional_iterator.html#fusion.iterator.concepts.bidirectional_iterator.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_iterator.html" title="Forward
Iterator">Forward
Iterator</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="../functions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
An iterator to the element preceding <tt class="computeroutput"><span class="identifier">i</span></tt>
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.iterator.concepts.bidirectional_iterator.invariants"></a><h5>
<a name="id472026"></a>
<a href="bidirectional_iterator.html#fusion.iterator.concepts.bidirectional_iterator.invariants">Invariants</a>
</h5>
<p>
In addition to the invariants of <a href="forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>, the following invariants always hold:
</p>
<div class="itemizedlist"><ul type="disc">
<li><tt class="computeroutput"><a href="../functions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">))</span> <span class="special">==</span> <span class="identifier">i</span> <span class="special">&amp;&amp;</span> <a href="../functions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">))</span> <span class="special">==</span> <a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../functions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">))</span></tt></li>
<li><tt class="computeroutput"><a href="../functions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span> <span class="special">==</span> <a href="../functions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;-</span><span class="number">1</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt></li>
<li>
Using <tt class="computeroutput"><a href="../functions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a></tt> to traverse a sequence
will never return a previously seen position
</li>
</ul></div>
<a name="fusion.iterator.concepts.bidirectional_iterator.models"></a><h5>
<a name="id472364"></a>
<a href="bidirectional_iterator.html#fusion.iterator.concepts.bidirectional_iterator.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>
iterator
</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>
iterator
</li>
<li>
<a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>
iterator
</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 <a href="../../sequence/concepts/bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a>)
</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 <a href="../../sequence/concepts/bidirectional_sequence.html" title="Bidirectional
Sequence">Bidirectional
Sequence</a>)
</li>
<li><a href="../../view/reverse_view.html" title="reverse_view"><tt class="computeroutput"><span class="identifier">reverse_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>
</div></td>
</tr></table>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.concepts.forward_iterator"></a><a href="forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a></h4></div></div></div>
<a name="fusion.iterator.concepts.forward_iterator.description"></a><h5>
<a name="id468268"></a>
<a href="forward_iterator.html#fusion.iterator.concepts.forward_iterator.description">Description</a>
</h5>
<p>
A Forward Iterator traverses a <a href="../../sequence.html" title="Sequence">Sequence</a>
allowing movement in only one direction through it's elements, one element
at a time.
</p>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">i</span></tt>,
<tt class="computeroutput"><span class="identifier">j</span></tt></span></dt>
<dd><p>
Forward Iterators
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">I</span></tt>,
<tt class="computeroutput"><span class="identifier">J</span></tt></span></dt>
<dd><p>
Forward Iterator types
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">M</span></tt></span></dt>
<dd><p>
An <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>
integral constant
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">N</span></tt></span></dt>
<dd><p>
An integral constant
</p></dd>
</dl>
</div>
<a name="fusion.iterator.concepts.forward_iterator.expression_requirements"></a><h5>
<a name="id468439"></a>
<a href="forward_iterator.html#fusion.iterator.concepts.forward_iterator.expression_requirements">Expression
requirements</a>
</h5>
<p>
A type models Forward Iterator if, in addition to being CopyConstructable,
the following expressions are valid:
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Return type
</p>
</th>
<th>
<p>
Runtime Complexity
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">i</span> <span class="special">==</span>
<span class="identifier">j</span></tt>
</p>
</td>
<td>
<p>
Convertible to bool
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">i</span> <span class="special">!=</span>
<span class="identifier">j</span></tt>
</p>
</td>
<td>
<p>
Convertible to bool
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../functions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../functions/advance.html" title="advance"><tt class="computeroutput"><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">M</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../functions/distance.html" title="distance"><tt class="computeroutput"><span class="identifier">distance</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">,</span>
<span class="identifier">j</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<tt class="computeroutput"><a href="../metafunctions/distance.html" title="distance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">distance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span>
<span class="identifier">J</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<tt class="computeroutput"><a href="../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">I</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="special">*</span><span class="identifier">i</span></tt>
</p>
</td>
<td>
<p>
<tt class="computeroutput"><a href="../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">I</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.iterator.concepts.forward_iterator.meta_expressions"></a><h5>
<a name="id469185"></a>
<a href="forward_iterator.html#fusion.iterator.concepts.forward_iterator.meta_expressions">Meta
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="../metafunctions/next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">I</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="../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">I</span><span class="special">,</span>
<span class="identifier">J</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="../metafunctions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">I</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>
Linear
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../metafunctions/advance.html" title="advance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span> <span class="special">,</span><span class="identifier">M</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Linear
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../metafunctions/distance.html" title="distance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">distance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span> <span class="special">,</span><span class="identifier">J</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
</td>
<td>
<p>
Linear
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../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">I</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="../metafunctions/value_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_of</span></tt></a><span class="special">&lt;</span><span class="identifier">I</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.iterator.concepts.forward_iterator.expression_semantics"></a><h5>
<a name="id469788"></a>
<a href="forward_iterator.html#fusion.iterator.concepts.forward_iterator.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="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
An iterator to the element following <tt class="computeroutput"><span class="identifier">i</span></tt>
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">i</span> <span class="special">==</span>
<span class="identifier">j</span></tt>
</p>
</td>
<td>
<p>
Iterator equality comparison
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">i</span> <span class="special">!=</span>
<span class="identifier">j</span></tt>
</p>
</td>
<td>
<p>
Iterator inequality comparison
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../functions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
An iterator n elements after <tt class="computeroutput"><span class="identifier">i</span></tt>
in the sequence
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../functions/advance.html" title="advance"><tt class="computeroutput"><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">M</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
Equivalent to <tt class="computeroutput"><span class="identifier">advance_c</span><span class="special">&lt;</span><span class="identifier">M</span><span class="special">::</span><span class="identifier">value</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../functions/distance.html" title="distance"><tt class="computeroutput"><span class="identifier">distance</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">,</span>
<span class="identifier">j</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
The number of elements between <tt class="computeroutput"><span class="identifier">i</span></tt>
and <tt class="computeroutput"><span class="identifier">j</span></tt>
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
The element at position<tt class="computeroutput"><span class="identifier">i</span></tt>
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="special">*</span><span class="identifier">i</span></tt>
</p>
</td>
<td>
<p>
Equivalent to <tt class="computeroutput"><span class="identifier">deref</span><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.iterator.concepts.forward_iterator.invariants"></a><h5>
<a name="id470396"></a>
<a href="forward_iterator.html#fusion.iterator.concepts.forward_iterator.invariants">Invariants</a>
</h5>
<p>
The following invariants always hold:
</p>
<div class="itemizedlist"><ul type="disc">
<li><tt class="computeroutput"><span class="special">!(</span><span class="identifier">i</span>
<span class="special">==</span> <span class="identifier">j</span><span class="special">)</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">i</span> <span class="special">!=</span> <span class="identifier">j</span><span class="special">)</span></tt></li>
<li><tt class="computeroutput"><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span> <span class="special">==</span> <a href="../functions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="number">1</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt></li>
<li><tt class="computeroutput"><a href="../functions/distance.html" title="distance"><tt class="computeroutput"><span class="identifier">distance</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <a href="../functions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">))</span> <span class="special">==</span> <span class="identifier">N</span></tt></li>
<li>
Using <tt class="computeroutput"><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a></tt> to traverse the
sequence will never return to a previously seen position
</li>
<li>
<tt class="computeroutput"><a href="../functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt> is equivalent to <tt class="computeroutput"><span class="special">*</span><span class="identifier">i</span></tt>
</li>
<li>
If <tt class="computeroutput"><span class="identifier">i</span> <span class="special">==</span>
<span class="identifier">j</span></tt> then <tt class="computeroutput"><span class="special">*</span><span class="identifier">i</span></tt> is equivalent to <tt class="computeroutput"><span class="special">*</span><span class="identifier">j</span></tt>
</li>
</ul></div>
<a name="fusion.iterator.concepts.forward_iterator.models"></a><h5>
<a name="id470821"></a>
<a href="forward_iterator.html#fusion.iterator.concepts.forward_iterator.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>
iterator
</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>
iterator
</li>
<li>
<a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>
iterator
</li>
<li>
<a href="../../container/cons.html" title="cons"><tt class="computeroutput"><span class="identifier">cons</span></tt></a>
iterator
</li>
<li>
<a href="../../container/list.html" title="list"><tt class="computeroutput"><span class="identifier">list</span></tt></a>
iterator
</li>
<li>
<a href="../../container/set.html" title="set"><tt class="computeroutput"><span class="identifier">set</span></tt></a>
iterator
</li>
<li>
<a href="../../container/map.html" title="map"><tt class="computeroutput"><span class="identifier">map</span></tt></a>
iterator
</li>
<li>
<a href="../../view/single_view.html" title="single_view"><tt class="computeroutput"><span class="identifier">single_view</span></tt></a>
iterator
</li>
<li>
<a href="../../view/filter_view.html" title="filter_view"><tt class="computeroutput"><span class="identifier">filter_view</span></tt></a>
iterator
</li>
<li>
<a href="../../view/iterator_range.html" title="iterator_range"><tt class="computeroutput"><span class="identifier">iterator_range</span></tt></a>
iterator
</li>
<li>
<a href="../../view/joint_view.html" title="joint_view"><tt class="computeroutput"><span class="identifier">joint_view</span></tt></a>
iterator
</li>
<li>
<a href="../../view/transform_view.html" title="transform_view"><tt class="computeroutput"><span class="identifier">transform_view</span></tt></a>
iterator
</li>
<li>
<a href="../../view/reverse_view.html" title="reverse_view"><tt class="computeroutput"><span class="identifier">reverse_view</span></tt></a>
iterator
</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.iterator.concepts.random_access_iterator"></a><a href="random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a></h4></div></div></div>
<a name="fusion.iterator.concepts.random_access_iterator.description"></a><h5>
<a name="id472582"></a>
<a href="random_access_iterator.html#fusion.iterator.concepts.random_access_iterator.description">Description</a>
</h5>
<p>
A Random Access Iterator traverses a <a href="../../sequence.html" title="Sequence">Sequence</a>
moving in either direction, permitting efficient arbitrary distance movements
back and forward through the sequence.
</p>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">i</span></tt>,
<tt class="computeroutput"><span class="identifier">j</span></tt></span></dt>
<dd><p>
Random Access Iterators
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">I</span></tt>,
<tt class="computeroutput"><span class="identifier">J</span></tt></span></dt>
<dd><p>
Random Access Iterator types
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">M</span></tt></span></dt>
<dd><p>
An <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>
integral constant
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">N</span></tt></span></dt>
<dd><p>
An integral constant
</p></dd>
</dl>
</div>
<a name="fusion.iterator.concepts.random_access_iterator.refinement_of"></a><h5>
<a name="id472754"></a>
<a href="random_access_iterator.html#fusion.iterator.concepts.random_access_iterator.refinement_of">Refinement
of</a>
</h5>
<p>
<a href="bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a>
</p>
<a name="fusion.iterator.concepts.random_access_iterator.expression_requirements"></a><h5>
<a name="id472793"></a>
<a href="random_access_iterator.html#fusion.iterator.concepts.random_access_iterator.expression_requirements">Expression
requirements</a>
</h5>
<p>
In addition to the requirements defined in <a href="bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a>, the following expressions must be valid:
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Return type
</p>
</th>
<th>
<p>
Runtime Complexity
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../functions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../functions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><a href="../functions/advance.html" title="advance"><tt class="computeroutput"><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">M</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
<a href="random_access_iterator.html" title="Random
Access Iterator">Random
Access Iterator</a>
</p>
</td>
<td>
<p>
Constant
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.iterator.concepts.random_access_iterator.meta_expressions"></a><h5>
<a name="id473176"></a>
<a href="random_access_iterator.html#fusion.iterator.concepts.random_access_iterator.meta_expressions">Meta
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="../metafunctions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">I</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="../metafunctions/advance.html" title="advance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span>
<span class="identifier">M</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="../metafunctions/distance.html" title="distance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">distance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span> <span class="special">,</span><span class="identifier">J</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.iterator.concepts.random_access_iterator.models"></a><h5>
<a name="id473482"></a>
<a href="random_access_iterator.html#fusion.iterator.concepts.random_access_iterator.models">Models</a>
</h5>
<div class="itemizedlist"><ul type="disc">
<li>
<a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>
iterator
</li>
<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>
iterator
</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>
iterator
</li>
<li>
<a href="../../view/iterator_range.html" title="iterator_range"><tt class="computeroutput"><span class="identifier">iterator_range</span></tt></a>
iterator (where adapted sequence is a <a href="../../sequence/concepts/random_access_sequence.html" title="Random
Access Sequence">Random
Access Sequence</a>)
</li>
<li>
<a href="../../view/transform_view.html" title="transform_view"><tt class="computeroutput"><span class="identifier">transform_view</span></tt></a>
iterator (where adapted sequence is a <a href="../../sequence/concepts/random_access_sequence.html" title="Random
Access Sequence">Random
Access Sequence</a>)
</li>
<li>
<a href="../../view/reverse_view.html" title="reverse_view"><tt class="computeroutput"><span class="identifier">reverse_view</span></tt></a>
iterator (where adapted sequence is a <a href="../../sequence/concepts/random_access_sequence.html" title="Random
Access Sequence">Random
Access Sequence</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>)
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<dt><span class="section"><a href="functions/deref.html">deref</a></span></dt>
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<dt><span class="section"><a href="functions/distance.html">distance</a></span></dt>
<dt><span class="section"><a href="functions/advance.html">advance</a></span></dt>
<dt><span class="section"><a href="functions/advance_c.html">advance_c</a></span></dt>
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<p>
Fusion provides functions for manipulating iterators, analogous to the similar
functions from the <a href="http://www.boost.org/libs/mpl/index.html" target="_top">MPL</a>
library.
</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>)
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<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.functions.advance"></a><a href="advance.html" title="advance">advance</a></h4></div></div></div>
<a name="fusion.iterator.functions.advance.description"></a><h5>
<a name="id476980"></a>
<a href="advance.html#fusion.iterator.functions.advance.description">Description</a>
</h5>
<p>
Moves an iterator by a specified distance.
</p>
<a name="fusion.iterator.functions.advance.synopsis"></a><h5>
<a name="id477010"></a>
<a href="advance.html#fusion.iterator.functions.advance.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">M</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/advance.html" title="advance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span> <span class="identifier">M</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">advance</span><span class="special">(</span><span class="identifier">I</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id477183"></a><p class="title"><b>Table<EFBFBD>1.6.<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">i</span></tt>
</p>
</td>
<td>
<p>
Model of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
Iterator to move relative to
</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>
Number of positions to move
</p>
</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.iterator.functions.advance.expression_semantics"></a><h5>
<a name="id477329"></a>
<a href="advance.html#fusion.iterator.functions.advance.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="advance.html" title="advance"><tt class="computeroutput"><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">M</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of the same iterator
concept as <tt class="computeroutput"><span class="identifier">i</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator to the
element <tt class="computeroutput"><span class="identifier">M</span></tt> positions from
<tt class="computeroutput"><span class="identifier">i</span></tt>. If <tt class="computeroutput"><span class="identifier">i</span></tt>
is a <a href="../concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a> then <tt class="computeroutput"><span class="identifier">M</span></tt>
may be negative.
</p>
<p>
/iterator/advance.hpp&gt;
</p>
<a name="fusion.iterator.functions.advance.example"></a><h5>
<a name="id477497"></a>
<a href="advance.html#fusion.iterator.functions.advance.example">Example</a>
</h5>
<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">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">vec</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="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="advance.html" title="advance"><tt class="computeroutput"><span class="identifier">advance</span></tt></a><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">2</span><span class="special">&gt;</span> <span class="special">&gt;(</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><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="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.functions.advance_c"></a><a href="advance_c.html" title="advance_c">advance_c</a></h4></div></div></div>
<a name="fusion.iterator.functions.advance_c.description"></a><h5>
<a name="id477794"></a>
<a href="advance_c.html#fusion.iterator.functions.advance_c.description">Description</a>
</h5>
<p>
Moves an iterator by a specified distance.
</p>
<a name="fusion.iterator.functions.advance_c.synopsis"></a><h5>
<a name="id477824"></a>
<a href="advance_c.html#fusion.iterator.functions.advance_c.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
<span class="keyword">int</span> <span class="identifier">N</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span> <span class="identifier">N</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">advance_c</span><span class="special">(</span><span class="identifier">I</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id477997"></a><p class="title"><b>Table<EFBFBD>1.7.<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">i</span></tt>
</p>
</td>
<td>
<p>
Model of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
Iterator to move relative to
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">N</span></tt>
</p>
</td>
<td>
<p>
Integer constant
</p>
</td>
<td>
<p>
Number of positions to move
</p>
</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.iterator.functions.advance_c.expression_semantics"></a><h5>
<a name="id478136"></a>
<a href="advance_c.html#fusion.iterator.functions.advance_c.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of the same iterator
concept as <tt class="computeroutput"><span class="identifier">i</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator to the
element <tt class="computeroutput"><span class="identifier">N</span></tt> positions from
<tt class="computeroutput"><span class="identifier">i</span></tt>. If <tt class="computeroutput"><span class="identifier">i</span></tt>
is a <a href="../concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a> then <tt class="computeroutput"><span class="identifier">N</span></tt>
may be negative.
</p>
<p>
/iterator/advance.hpp&gt;
</p>
<a name="fusion.iterator.functions.advance_c.example"></a><h5>
<a name="id478308"></a>
<a href="advance_c.html#fusion.iterator.functions.advance_c.example">Example</a>
</h5>
<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">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">vec</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="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="number">2</span><span class="special">&gt;(</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><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>)
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<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.functions.deref"></a><a href="deref.html" title="deref">deref</a></h4></div></div></div>
<a name="fusion.iterator.functions.deref.description"></a><h5>
<a name="id473739"></a>
<a href="deref.html#fusion.iterator.functions.deref.description">Description</a>
</h5>
<p>
Deferences an iterator.
</p>
<a name="fusion.iterator.functions.deref.synopsis"></a><h5>
<a name="id473768"></a>
<a href="deref.html#fusion.iterator.functions.deref.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../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">I</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">deref</span><span class="special">(</span><span class="identifier">I</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id473914"></a><p class="title"><b>Table<EFBFBD>1.2.<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">i</span></tt>
</p>
</td>
<td>
<p>
Model of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
Operation's argument
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterator.functions.deref.expression_semantics"></a><h5>
<a name="id474016"></a>
<a href="deref.html#fusion.iterator.functions.deref.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><a href="../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">I</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Dereferences the iterator
<tt class="computeroutput"><span class="identifier">i</span></tt>.
</p>
<p>
/iterator/deref.hpp&gt;
</p>
<a name="fusion.iterator.functions.deref.example"></a><h5>
<a name="id474168"></a>
<a href="deref.html#fusion.iterator.functions.deref.example">Example</a>
</h5>
<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">int</span><span class="special">&amp;&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">int</span> <span class="identifier">i</span><span class="special">(</span><span class="number">0</span><span class="special">);</span>
<span class="identifier">vec</span> <span class="identifier">v</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="identifier">i</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><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>
<span class="identifier">assert</span><span class="special">(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">)))</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(&amp;(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">))))</span> <span class="special">==</span> <span class="special">&amp;</span><span class="identifier">i</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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<title>distance</title>
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<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.functions.distance"></a><a href="distance.html" title="distance">distance</a></h4></div></div></div>
<a name="fusion.iterator.functions.distance.description"></a><h5>
<a name="id476193"></a>
<a href="distance.html#fusion.iterator.functions.distance.description">Description</a>
</h5>
<p>
Returns the distance between 2 iterators.
</p>
<a name="fusion.iterator.functions.distance.synopsis"></a><h5>
<a name="id476222"></a>
<a href="distance.html#fusion.iterator.functions.distance.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">J</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/distance.html" title="distance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">distance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span> <span class="identifier">J</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">distance</span><span class="special">(</span><span class="identifier">I</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">J</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">j</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id476423"></a><p class="title"><b>Table<EFBFBD>1.5.<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">i</span></tt>, <tt class="computeroutput"><span class="identifier">j</span></tt>
</p>
</td>
<td>
<p>
Models of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a> into the same sequence
</p>
</td>
<td>
<p>
The start and end points of the distance to be measured
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterator.functions.distance.expression_semantics"></a><h5>
<a name="id476538"></a>
<a href="distance.html#fusion.iterator.functions.distance.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="distance.html" title="distance"><tt class="computeroutput"><span class="identifier">distance</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">,</span><span class="identifier">j</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">int</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the distance between
iterators <tt class="computeroutput"><span class="identifier">i</span></tt> and <tt class="computeroutput"><span class="identifier">j</span></tt>.
</p>
<p>
/iterator/distance.hpp&gt;
</p>
<a name="fusion.iterator.functions.distance.example"></a><h5>
<a name="id476670"></a>
<a href="distance.html#fusion.iterator.functions.distance.example">Example</a>
</h5>
<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">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">vec</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="distance.html" title="distance"><tt class="computeroutput"><span class="identifier">distance</span></tt></a><span class="special">(</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">),</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</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>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.functions.next"></a><a href="next.html" title="next">next</a></h4></div></div></div>
<a name="fusion.iterator.functions.next.description"></a><h5>
<a name="id474616"></a>
<a href="next.html#fusion.iterator.functions.next.description">Description</a>
</h5>
<p>
Moves an iterator 1 position forwards.
</p>
<a name="fusion.iterator.functions.next.synopsis"></a><h5>
<a name="id474645"></a>
<a href="next.html#fusion.iterator.functions.next.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">next</span><span class="special">(</span><span class="identifier">I</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id474790"></a><p class="title"><b>Table<EFBFBD>1.3.<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">i</span></tt>
</p>
</td>
<td>
<p>
Model of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
Operation's argument
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterator.functions.next.expression_semantics"></a><h5>
<a name="id474891"></a>
<a href="next.html#fusion.iterator.functions.next.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<span class="identifier">next</span><span class="special">(</span><span class="identifier">i</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of the same iterator
concept as <tt class="computeroutput"><span class="identifier">i</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator to the
next element after <tt class="computeroutput"><span class="identifier">i</span></tt>.
</p>
<p>
/iterator/next.hpp&gt;
</p>
<a name="fusion.iterator.functions.next.example"></a><h5>
<a name="id474994"></a>
<a href="next.html#fusion.iterator.functions.next.example">Example</a>
</h5>
<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">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">vec</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="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><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>
<span class="identifier">assert</span><span class="special">(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">)))</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><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>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.functions.prior"></a><a href="prior.html" title="prior">prior</a></h4></div></div></div>
<a name="fusion.iterator.functions.prior.description"></a><h5>
<a name="id475447"></a>
<a href="prior.html#fusion.iterator.functions.prior.description">Description</a>
</h5>
<p>
Moves an iterator 1 position backwards.
</p>
<a name="fusion.iterator.functions.prior.synopsis"></a><h5>
<a name="id475476"></a>
<a href="prior.html#fusion.iterator.functions.prior.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../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><span class="identifier">I</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">prior</span><span class="special">(</span><span class="identifier">I</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id475620"></a><p class="title"><b>Table<EFBFBD>1.4.<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">i</span></tt>
</p>
</td>
<td>
<p>
Model of <a href="../concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a>
</p>
</td>
<td>
<p>
Operation's argument
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterator.functions.prior.expression_semantics"></a><h5>
<a name="id475722"></a>
<a href="prior.html#fusion.iterator.functions.prior.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of the same iterator
concept as <tt class="computeroutput"><span class="identifier">i</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator to the
element prior to <tt class="computeroutput"><span class="identifier">i</span></tt>.
</p>
<p>
/iterator/prior.hpp&gt;
</p>
<a name="fusion.iterator.functions.prior.example"></a><h5>
<a name="id475836"></a>
<a href="prior.html#fusion.iterator.functions.prior.example">Example</a>
</h5>
<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">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">vec</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="identifier">assert</span><span class="special">(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">)))</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="prior.html" title="prior"><tt class="computeroutput"><span class="identifier">prior</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><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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<a name="fusion.iterator.metafunctions"></a><a href="metafunctions.html" title="Metafunctions">Metafunctions</a></h3></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="metafunctions/value_of.html">value_of</a></span></dt>
<dt><span class="section"><a href="metafunctions/deref.html">deref</a></span></dt>
<dt><span class="section"><a href="metafunctions/next.html">next</a></span></dt>
<dt><span class="section"><a href="metafunctions/prior.html">prior</a></span></dt>
<dt><span class="section"><a href="metafunctions/equal_to.html">equal_to</a></span></dt>
<dt><span class="section"><a href="metafunctions/distance.html">distance</a></span></dt>
<dt><span class="section"><a href="metafunctions/advance.html">advance</a></span></dt>
<dt><span class="section"><a href="metafunctions/advance_c.html">advance_c</a></span></dt>
</dl></div>
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<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><h4 class="title">
<a name="fusion.iterator.metafunctions.advance"></a><a href="advance.html" title="advance">advance</a></h4></div></div></div>
<a name="fusion.iterator.metafunctions.advance.description"></a><h5>
<a name="id485525"></a>
<a href="advance.html#fusion.iterator.metafunctions.advance.description">Description</a>
</h5>
<p>
Moves an iterator a specified distance.
</p>
<a name="fusion.iterator.metafunctions.advance.synopsis"></a><h5>
<a name="id485557"></a>
<a href="advance.html#fusion.iterator.metafunctions.advance.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">M</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">advance</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="id485674"></a><p class="title"><b>Table<EFBFBD>1.17.<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">I</span></tt>
</p>
</td>
<td>
<p>
Model of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
Iterator to move relative to
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">M</span></tt>
</p>
</td>
<td>
<p>
Model of <a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Integral Constant</a>
</p>
</td>
<td>
<p>
Number of positions to move
</p>
</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.iterator.metafunctions.advance.expression_semantics"></a><h5>
<a name="id485820"></a>
<a href="advance.html#fusion.iterator.metafunctions.advance.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="advance.html" title="advance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</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>: A model of the same iterator
concept as <tt class="computeroutput"><span class="identifier">I</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator a distance
<tt class="computeroutput"><span class="identifier">M</span></tt> from <tt class="computeroutput"><span class="identifier">I</span></tt>.
If <tt class="computeroutput"><span class="identifier">I</span></tt> is a <a href="../concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a> then <tt class="computeroutput"><span class="identifier">M</span></tt>
may be negative.
</p>
<p>
/iterator/advance.hpp&gt;
</p>
<a name="fusion.iterator.metafunctions.advance.example"></a><h5>
<a name="id486004"></a>
<a href="advance.html#fusion.iterator.metafunctions.advance.example">Example</a>
</h5>
<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">double</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="../../sequence/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">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">first</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">second</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">second</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">third</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><a href="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><a href="advance.html" title="advance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">first</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">2</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">third</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><h4 class="title">
<a name="fusion.iterator.metafunctions.advance_c"></a><a href="advance_c.html" title="advance_c">advance_c</a></h4></div></div></div>
<a name="fusion.iterator.metafunctions.advance_c.description"></a><h5>
<a name="id486466"></a>
<a href="advance_c.html#fusion.iterator.metafunctions.advance_c.description">Description</a>
</h5>
<p>
Moves an iterator by a specified distance.
</p>
<a name="fusion.iterator.metafunctions.advance_c.synopsis"></a><h5>
<a name="id486497"></a>
<a href="advance_c.html#fusion.iterator.metafunctions.advance_c.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
<span class="keyword">int</span> <span class="identifier">N</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">advance_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="id486616"></a><p class="title"><b>Table<EFBFBD>1.18.<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">I</span></tt>
</p>
</td>
<td>
<p>
Model of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
Iterator to move relative to
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">N</span></tt>
</p>
</td>
<td>
<p>
Integer constant
</p>
</td>
<td>
<p>
Number of positions to move
</p>
</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.iterator.metafunctions.advance_c.expression_semantics"></a><h5>
<a name="id486754"></a>
<a href="advance_c.html#fusion.iterator.metafunctions.advance_c.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">I</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>: A model of the same iterator
concept as <tt class="computeroutput"><span class="identifier">I</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator a distance
<tt class="computeroutput"><span class="identifier">N</span></tt> from <tt class="computeroutput"><span class="identifier">I</span></tt>.
If <tt class="computeroutput"><span class="identifier">I</span></tt> is a <a href="../concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a> then <tt class="computeroutput"><span class="identifier">N</span></tt>
may be negative. Equivalent to <tt class="computeroutput"><a href="advance.html" title="advance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</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="identifier">N</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span></tt>.
</p>
<p>
/iterator/advance.hpp&gt;
</p>
<a name="fusion.iterator.metafunctions.advance_c.example"></a><h5>
<a name="id487040"></a>
<a href="advance_c.html#fusion.iterator.metafunctions.advance_c.example">Example</a>
</h5>
<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">double</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="../../sequence/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">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">first</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">second</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">second</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">third</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><a href="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><a href="advance_c.html" title="advance_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">advance_c</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">,</span> <span class="number">2</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">third</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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<a accesskey="p" href="advance.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="../../sequence.html"><img src="../../../../../../../doc/html/images/next.png" alt="Next"></a>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.metafunctions.deref"></a><a href="deref.html" title="deref">deref</a></h4></div></div></div>
<a name="fusion.iterator.metafunctions.deref.description"></a><h5>
<a name="id481385"></a>
<a href="deref.html#fusion.iterator.metafunctions.deref.description">Description</a>
</h5>
<p>
Returns the type that will be returned by dereferencing an iterator.
</p>
<a name="fusion.iterator.metafunctions.deref.synposis"></a><h5>
<a name="id481415"></a>
<a href="deref.html#fusion.iterator.metafunctions.deref.synposis">Synposis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">deref</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="id481516"></a><p class="title"><b>Table<EFBFBD>1.12.<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">I</span></tt>
</p>
</td>
<td>
<p>
Model of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
Operation's argument
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterator.metafunctions.deref.expression_semantics"></a><h5>
<a name="id481617"></a>
<a href="deref.html#fusion.iterator.metafunctions.deref.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="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">I</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 dereferencing
an iterator of type <tt class="computeroutput"><span class="identifier">I</span></tt>.
</p>
<p>
/iterator/deref.hpp&gt;
</p>
<a name="fusion.iterator.metafunctions.deref.example"></a><h5>
<a name="id481738"></a>
<a href="deref.html#fusion.iterator.metafunctions.deref.example">Example</a>
</h5>
<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">int</span><span class="special">&amp;&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">vec</span> <span class="identifier">const_vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="../../sequence/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">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">first</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">second</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="../../sequence/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">const_vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">const_first</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">const_first</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">const_second</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="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">first</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>
<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="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">second</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="value_of.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="next.html"><img src="../../../../../../../doc/html/images/next.png" alt="Next"></a>
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<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.metafunctions.distance"></a><a href="distance.html" title="distance">distance</a></h4></div></div></div>
<a name="fusion.iterator.metafunctions.distance.description"></a><h5>
<a name="id484680"></a>
<a href="distance.html#fusion.iterator.metafunctions.distance.description">Description</a>
</h5>
<p>
Returns the distance between two iterators.
</p>
<a name="fusion.iterator.metafunctions.distance.synopsis"></a><h5>
<a name="id484711"></a>
<a href="distance.html#fusion.iterator.metafunctions.distance.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">J</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">distance</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id484828"></a><p class="title"><b>Table<EFBFBD>1.16.<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">I</span></tt>, <tt class="computeroutput"><span class="identifier">J</span></tt>
</p>
</td>
<td>
<p>
Models of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a> into the same sequence
</p>
</td>
<td>
<p>
The start and end points of the distance to be measured
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterator.metafunctions.distance.expression_semantics"></a><h5>
<a name="id484942"></a>
<a href="distance.html#fusion.iterator.metafunctions.distance.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="distance.html" title="distance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">distance</span></tt></a><span class="special">&lt;</span><span class="identifier">I</span><span class="special">,</span> <span class="identifier">J</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Integral Constant</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the distance between
iterators of types <tt class="computeroutput"><span class="identifier">I</span></tt> and
<tt class="computeroutput"><span class="identifier">J</span></tt>.
</p>
<p>
/iterator/distance.hpp&gt;
</p>
<a name="fusion.iterator.metafunctions.distance.example"></a><h5>
<a name="id485092"></a>
<a href="distance.html#fusion.iterator.metafunctions.distance.example">Example</a>
</h5>
<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">double</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="../../sequence/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">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">first</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">second</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">second</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">third</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="distance.html" title="distance"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">distance</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">,</span><span class="identifier">third</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">dist</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT_RELATION</span><span class="special">(</span><span class="identifier">dist</span><span class="special">::</span><span class="identifier">value</span><span class="special">,</span> <span class="special">==,</span> <span class="number">2</span><span class="special">);</span>
</pre>
</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><h4 class="title">
<a name="fusion.iterator.metafunctions.equal_to"></a><a href="equal_to.html" title="equal_to">equal_to</a></h4></div></div></div>
<a name="fusion.iterator.metafunctions.equal_to.description"></a><h5>
<a name="id483818"></a>
<a href="equal_to.html#fusion.iterator.metafunctions.equal_to.description">Description</a>
</h5>
<p>
Returns a true-valued <a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Integral Constant</a> if <tt class="computeroutput"><span class="identifier">I</span></tt>
and <tt class="computeroutput"><span class="identifier">J</span></tt> are equal.
</p>
<a name="fusion.iterator.metafunctions.equal_to.synopsis"></a><h5>
<a name="id483881"></a>
<a href="equal_to.html#fusion.iterator.metafunctions.equal_to.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">J</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">equal_to</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="id483998"></a><p class="title"><b>Table<EFBFBD>1.15.<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">I</span></tt>, <tt class="computeroutput"><span class="identifier">J</span></tt>
</p>
</td>
<td>
<p>
Any fusion iterators
</p>
</td>
<td>
<p>
Operation's arguments
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterator.metafunctions.equal_to.expression_semantics"></a><h5>
<a name="id484103"></a>
<a href="equal_to.html#fusion.iterator.metafunctions.equal_to.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="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">I</span><span class="special">,</span> <span class="identifier">J</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of <a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Integral Constant</a>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns <tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt>
if <tt class="computeroutput"><span class="identifier">I</span></tt> and <tt class="computeroutput"><span class="identifier">J</span></tt> are iterators to the same position.
Returns <tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></tt> otherwise.
</p>
<p>
/iterator/equal_to.hpp&gt;
</p>
<a name="fusion.iterator.metafunctions.equal_to.example"></a><h5>
<a name="id484316"></a>
<a href="equal_to.html#fusion.iterator.metafunctions.equal_to.example">Example</a>
</h5>
<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">double</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="../../sequence/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">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">first</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="../../sequence/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">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">last</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><a href="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> <span class="identifier">first</span><span class="special">&gt;));</span>
<span class="identifier">BOOST_MPL_ASSERT_NOT</span><span class="special">((</span><a href="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><span class="identifier">last</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><h4 class="title">
<a name="fusion.iterator.metafunctions.next"></a><a href="next.html" title="next">next</a></h4></div></div></div>
<a name="fusion.iterator.metafunctions.next.description"></a><h5>
<a name="id482320"></a>
<a href="next.html#fusion.iterator.metafunctions.next.description">Description</a>
</h5>
<p>
Returns the type of the next iterator in a sequence.
</p>
<a name="fusion.iterator.metafunctions.next.synposis"></a><h5>
<a name="id482350"></a>
<a href="next.html#fusion.iterator.metafunctions.next.synposis">Synposis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">next</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="id482451"></a><p class="title"><b>Table<EFBFBD>1.13.<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">I</span></tt>
</p>
</td>
<td>
<p>
Model of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
Operation's argument
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterator.metafunctions.next.expression_semantics"></a><h5>
<a name="id482553"></a>
<a href="next.html#fusion.iterator.metafunctions.next.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">I</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 iterator
concept as <tt class="computeroutput"><span class="identifier">I</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator to the
next element in the sequence after <tt class="computeroutput"><span class="identifier">I</span></tt>.
</p>
<p>
/iterator/next.hpp&gt;
</p>
<a name="fusion.iterator.metafunctions.next.example"></a><h5>
<a name="id482683"></a>
<a href="next.html#fusion.iterator.metafunctions.next.example">Example</a>
</h5>
<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">double</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><a href="../../sequence/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">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">second</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_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_of</span></tt></a><span class="special">&lt;</span><span class="identifier">second</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">double</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><h4 class="title">
<a name="fusion.iterator.metafunctions.prior"></a><a href="prior.html" title="prior">prior</a></h4></div></div></div>
<a name="fusion.iterator.metafunctions.prior.description"></a><h5>
<a name="id482990"></a>
<a href="prior.html#fusion.iterator.metafunctions.prior.description">Description</a>
</h5>
<p>
Returns the type of the previous iterator in a sequence.
</p>
<a name="fusion.iterator.metafunctions.prior.synopsis"></a><h5>
<a name="id483021"></a>
<a href="prior.html#fusion.iterator.metafunctions.prior.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">prior</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="id483121"></a><p class="title"><b>Table<EFBFBD>1.14.<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">I</span></tt>
</p>
</td>
<td>
<p>
Model of <a href="../concepts/bidirectional_iterator.html" title="Bidirectional
Iterator">Bidirectional
Iterator</a>
</p>
</td>
<td>
<p>
Operation's argument
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterator.metafunctions.prior.expression_semantics"></a><h5>
<a name="id483222"></a>
<a href="prior.html#fusion.iterator.metafunctions.prior.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="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><span class="identifier">I</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 iterator
concept as <tt class="computeroutput"><span class="identifier">I</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator to the
previous element in the sequence before <tt class="computeroutput"><span class="identifier">I</span></tt>.
</p>
<p>
/iterator/prior.hpp&gt;
</p>
<a name="fusion.iterator.metafunctions.prior.example"></a><h5>
<a name="id483355"></a>
<a href="prior.html#fusion.iterator.metafunctions.prior.example">Example</a>
</h5>
<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">double</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><a href="../../sequence/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">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">second</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_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_of</span></tt></a><span class="special">&lt;</span><span class="identifier">second</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">double</span><span class="special">&gt;));</span>
<span class="keyword">typedef</span> <a href="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><span class="identifier">second</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><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="value_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_of</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">int</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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<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.metafunctions.value_of"></a><a href="value_of.html" title="value_of">value_of</a></h4></div></div></div>
<a name="fusion.iterator.metafunctions.value_of.description"></a><h5>
<a name="id480431"></a>
<a href="value_of.html#fusion.iterator.metafunctions.value_of.description">Description</a>
</h5>
<p>
Returns the type stored at the position of an iterator.
</p>
<a name="fusion.iterator.metafunctions.value_of.synopsis"></a><h5>
<a name="id480462"></a>
<a href="value_of.html#fusion.iterator.metafunctions.value_of.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">value_of</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="id480561"></a><p class="title"><b>Table<EFBFBD>1.11.<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">I</span></tt>
</p>
</td>
<td>
<p>
Model of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
Operation's argument
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterator.metafunctions.value_of.expression_semantics"></a><h5>
<a name="id480661"></a>
<a href="value_of.html#fusion.iterator.metafunctions.value_of.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="value_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_of</span></tt></a><span class="special">&lt;</span><span class="identifier">I</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 type stored in
a sequence at iterator position <tt class="computeroutput"><span class="identifier">I</span></tt>.
</p>
<p>
/iterator/value_of.hpp&gt;
</p>
<a name="fusion.iterator.metafunctions.value_of.example"></a><h5>
<a name="id480781"></a>
<a href="value_of.html#fusion.iterator.metafunctions.value_of.example">Example</a>
</h5>
<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">int</span><span class="special">&amp;,</span><span class="keyword">const</span> <span class="keyword">int</span><span class="special">&amp;&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="../../sequence/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">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">first</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">second</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">second</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">third</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_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_of</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;));</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_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_of</span></tt></a><span class="special">&lt;</span><span class="identifier">second</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>
<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_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_of</span></tt></a><span class="special">&lt;</span><span class="identifier">third</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">const</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>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="fusion.iterator.operator"></a><a href="operator.html" title="Operator">Operator</a></h3></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="operator/operator_unary_star.html"> Operator
*</a></span></dt>
<dt><span class="section"><a href="operator/operator_equality.html"> Operator
==</a></span></dt>
<dt><span class="section"><a href="operator/operator_inequality.html"> Operator
!=</a></span></dt>
</dl></div>
<p>
Overloaded operators are provided to provide a more natural syntax for dereferencing
iterators, and comparing them for equality.
</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="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.operator.operator_equality"></a><a href="operator_equality.html" title=" Operator
=="> Operator
==</a></h4></div></div></div>
<a name="fusion.iterator.operator.operator_equality.description"></a><h5>
<a name="id479437"></a>
<a href="operator_equality.html#fusion.iterator.operator.operator_equality.description">Description</a>
</h5>
<p>
Compares 2 iterators for equality.
</p>
<a name="fusion.iterator.operator.operator_equality.synopsis"></a><h5>
<a name="id479468"></a>
<a href="operator_equality.html#fusion.iterator.operator.operator_equality.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">J</span>
<span class="special">&gt;</span>
<span class="emphasis"><em>unspecified</em></span> <span class="keyword">operator</span><span class="special">==(</span><span class="identifier">I</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">J</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id479610"></a><p class="title"><b>Table<EFBFBD>1.9.<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">i</span></tt>, <tt class="computeroutput"><span class="identifier">j</span></tt>
</p>
</td>
<td>
<p>
Any fusion iterators
</p>
</td>
<td>
<p>
Operation's arguments
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterator.operator.operator_equality.expression_semantics"></a><h5>
<a name="id479714"></a>
<a href="operator_equality.html#fusion.iterator.operator.operator_equality.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<span class="identifier">i</span> <span class="special">==</span> <span class="identifier">j</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>: Equivalent to <tt class="computeroutput"><a href="../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">I</span><span class="special">,</span><span class="identifier">J</span><span class="special">&gt;::</span><span class="identifier">value</span></tt>
where <tt class="computeroutput"><span class="identifier">I</span></tt> and <tt class="computeroutput"><span class="identifier">J</span></tt> are the types of <tt class="computeroutput"><span class="identifier">i</span></tt>
and <tt class="computeroutput"><span class="identifier">j</span></tt> respectively.
</p>
<p>
/iterator/equal_to.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>
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<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.operator.operator_inequality"></a><a href="operator_inequality.html" title=" Operator
!="> Operator
!=</a></h4></div></div></div>
<a name="fusion.iterator.operator.operator_inequality.description"></a><h5>
<a name="id479932"></a>
<a href="operator_inequality.html#fusion.iterator.operator.operator_inequality.description">Description</a>
</h5>
<p>
Compares 2 iterators for inequality.
</p>
<a name="fusion.iterator.operator.operator_inequality.synopsis"></a><h5>
<a name="id479964"></a>
<a href="operator_inequality.html#fusion.iterator.operator.operator_inequality.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">J</span>
<span class="special">&gt;</span>
<span class="emphasis"><em>unspecified</em></span> <span class="keyword">operator</span><span class="special">==(</span><span class="identifier">I</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">J</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id480108"></a><p class="title"><b>Table<EFBFBD>1.10.<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">i</span></tt>, <tt class="computeroutput"><span class="identifier">j</span></tt>
</p>
</td>
<td>
<p>
Any fusion iterators
</p>
</td>
<td>
<p>
Operation's arguments
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterator.operator.operator_inequality.expression_semantics"></a><h5>
<a name="id480213"></a>
<a href="operator_inequality.html#fusion.iterator.operator.operator_inequality.expression_semantics">Expression
Semantics</a>
</h5>
<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>: Equivalent to <tt class="computeroutput"><span class="special">!</span><a href="../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">I</span><span class="special">,</span><span class="identifier">J</span><span class="special">&gt;::</span><span class="identifier">value</span></tt>
where <tt class="computeroutput"><span class="identifier">I</span></tt> and <tt class="computeroutput"><span class="identifier">J</span></tt> are the types of <tt class="computeroutput"><span class="identifier">i</span></tt>
and <tt class="computeroutput"><span class="identifier">j</span></tt> respectively.
</p>
<p>
/iterator/equal_to.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="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.operator.operator_unary_star"></a><a href="operator_unary_star.html" title=" Operator
*"> Operator
*</a></h4></div></div></div>
<a name="fusion.iterator.operator.operator_unary_star.description"></a><h5>
<a name="id478608"></a>
<a href="operator_unary_star.html#fusion.iterator.operator.operator_unary_star.description">Description</a>
</h5>
<p>
Dereferences an iterator.
</p>
<a name="fusion.iterator.operator.operator_unary_star.synopsis"></a><h5>
<a name="id478639"></a>
<a href="operator_unary_star.html#fusion.iterator.operator.operator_unary_star.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../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">I</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="keyword">operator</span><span class="special">*(</span><span class="emphasis"><em>unspecified</em></span><span class="special">&lt;</span><span class="identifier">I</span><span class="special">&gt;</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id478798"></a><p class="title"><b>Table<EFBFBD>1.8.<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">i</span></tt>
</p>
</td>
<td>
<p>
Model of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
Operation's argument
</p>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterator.operator.operator_unary_star.expression_semantics"></a><h5>
<a name="id478900"></a>
<a href="operator_unary_star.html#fusion.iterator.operator.operator_unary_star.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<span class="special">*</span><span class="identifier">i</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Equivalent to the return
type of <tt class="computeroutput"><a href="../functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Equivalent to <tt class="computeroutput"><a href="../functions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">)</span></tt>.
</p>
<p>
/iterator/deref.hpp&gt;
</p>
<a name="fusion.iterator.operator.operator_unary_star.example"></a><h5>
<a name="id479046"></a>
<a href="operator_unary_star.html#fusion.iterator.operator.operator_unary_star.example">Example</a>
</h5>
<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">int</span><span class="special">&amp;&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">int</span> <span class="identifier">i</span><span class="special">(</span><span class="number">0</span><span class="special">);</span>
<span class="identifier">vec</span> <span class="identifier">v</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="identifier">i</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(*</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><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>
<span class="identifier">assert</span><span class="special">(*</span><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">))</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(&amp;(*</span><a href="../functions/next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">)))</span> <span class="special">==</span> <span class="special">&amp;</span><span class="identifier">i</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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