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[SVN r35070]
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Dave Abrahams
2006-09-11 22:27:29 +00:00
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<title>Permutation Iterator</title>
<meta name="author" content="Toon Knapen, David Abrahams, Roland Richter, Jeremy Siek" />
<meta name="organization" content="Boost Consulting, Indiana University Open Systems Lab" />
<meta name="date" content="2004-11-01" />
<meta name="copyright" content="Copyright Toon Knapen, David Abrahams, Roland Richter, and Jeremy Siek 2003." />
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<body>
<div class="document" id="permutation-iterator">
@ -31,18 +313,24 @@ Lab</a></td></tr>
<td>Copyright Toon Knapen, David Abrahams, Roland Richter, and Jeremy Siek 2003.</td></tr>
</tbody>
</table>
<!-- Distributed under the Boost -->
<!-- Software License, Version 1.0. (See accompanying -->
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">abstract:</th><td class="field-body">The permutation iterator adaptor provides a permuted view of a given
<tr class="field"><th class="field-name">abstract:</th><td class="field-body"><!-- Copyright David Abrahams 2006. Distributed under the Boost -->
<!-- Software License, Version 1.0. (See accompanying -->
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
The permutation iterator adaptor provides a permuted view of a given
range. That is, the view includes every element of the given range but
in a potentially different order.</td>
</tr>
</tbody>
</table>
<div class="contents topic" id="table-of-contents">
<p class="topic-title first"><a name="table-of-contents">Table of Contents</a></p>
<div class="contents topic">
<p class="topic-title first"><a id="table-of-contents" name="table-of-contents">Table of Contents</a></p>
<ul class="simple">
<li><a class="reference" href="#introduction" id="id2" name="id2">Introduction</a></li>
<li><a class="reference" href="#reference" id="id3" name="id3">Reference</a><ul>
@ -54,8 +342,11 @@ in a potentially different order.</td>
<li><a class="reference" href="#example" id="id7" name="id7">Example</a></li>
</ul>
</div>
<div class="section" id="introduction">
<h1><a class="toc-backref" href="#id2" name="introduction">Introduction</a></h1>
<div class="section">
<h1><a class="toc-backref" href="#id2" id="introduction" name="introduction">Introduction</a></h1>
<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
<!-- Software License, Version 1.0. (See accompanying -->
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
<p>The adaptor takes two arguments:</p>
<blockquote>
<ul class="simple">
@ -74,8 +365,11 @@ to be unique. In this same context, it must be noted that the past the
end permutation iterator is completely defined by means of the
past-the-end iterator to the indices.</p>
</div>
<div class="section" id="reference">
<h1><a class="toc-backref" href="#id3" name="reference">Reference</a></h1>
<div class="section">
<h1><a class="toc-backref" href="#id3" id="reference" name="reference">Reference</a></h1>
<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
<!-- Software License, Version 1.0. (See accompanying -->
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
<pre class="literal-block">
template&lt; class ElementIterator
, class IndexIterator
@ -104,28 +398,28 @@ private:
};
template &lt;class ElementIterator, class IndexIterator&gt;
permutation_iterator&lt;ElementIterator, IndexIterator&gt;
permutation_iterator&lt;ElementIterator, IndexIterator&gt;
make_permutation_iterator( ElementIterator e, IndexIterator i);
</pre>
<div class="section" id="permutation-iterator-requirements">
<h2><a class="toc-backref" href="#id4" name="permutation-iterator-requirements"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> requirements</a></h2>
<div class="section">
<h2><a class="toc-backref" href="#id4" id="permutation-iterator-requirements" name="permutation-iterator-requirements"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> requirements</a></h2>
<p><tt class="docutils literal"><span class="pre">ElementIterator</span></tt> shall model Random Access Traversal Iterator.
<tt class="docutils literal"><span class="pre">IndexIterator</span></tt> shall model Readable Iterator. The value type of
the <tt class="docutils literal"><span class="pre">IndexIterator</span></tt> must be convertible to the difference type of
<tt class="docutils literal"><span class="pre">ElementIterator</span></tt>.</p>
</div>
<div class="section" id="permutation-iterator-models">
<h2><a class="toc-backref" href="#id5" name="permutation-iterator-models"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> models</a></h2>
<div class="section">
<h2><a class="toc-backref" href="#id5" id="permutation-iterator-models" name="permutation-iterator-models"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> models</a></h2>
<p><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> models the same iterator traversal concepts
as <tt class="docutils literal"><span class="pre">IndexIterator</span></tt> and the same iterator access concepts as
<tt class="docutils literal"><span class="pre">ElementIterator</span></tt>.</p>
<p>If <tt class="docutils literal"><span class="pre">IndexIterator</span></tt> models Single Pass Iterator and
<p>If <tt class="docutils literal"><span class="pre">IndexIterator</span></tt> models Single Pass Iterator and
<tt class="docutils literal"><span class="pre">ElementIterator</span></tt> models Readable Iterator then
<tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> models Input Iterator.</p>
<p>If <tt class="docutils literal"><span class="pre">IndexIterator</span></tt> models Forward Traversal Iterator and
<p>If <tt class="docutils literal"><span class="pre">IndexIterator</span></tt> models Forward Traversal Iterator and
<tt class="docutils literal"><span class="pre">ElementIterator</span></tt> models Readable Lvalue Iterator then
<tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> models Forward Iterator.</p>
<p>If <tt class="docutils literal"><span class="pre">IndexIterator</span></tt> models Bidirectional Traversal Iterator and
<p>If <tt class="docutils literal"><span class="pre">IndexIterator</span></tt> models Bidirectional Traversal Iterator and
<tt class="docutils literal"><span class="pre">ElementIterator</span></tt> models Readable Lvalue Iterator then
<tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> models Bidirectional Iterator.</p>
<p>If <tt class="docutils literal"><span class="pre">IndexIterator</span></tt> models Random Access Traversal Iterator and
@ -136,8 +430,8 @@ with <tt class="docutils literal"><span class="pre">permutation_iterator&lt;E2,<
<tt class="docutils literal"><span class="pre">X</span></tt> is interoperable with <tt class="docutils literal"><span class="pre">Y</span></tt> and <tt class="docutils literal"><span class="pre">E1</span></tt> is convertible
to <tt class="docutils literal"><span class="pre">E2</span></tt>.</p>
</div>
<div class="section" id="permutation-iterator-operations">
<h2><a class="toc-backref" href="#id6" name="permutation-iterator-operations"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> operations</a></h2>
<div class="section">
<h2><a class="toc-backref" href="#id6" id="permutation-iterator-operations" name="permutation-iterator-operations"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> operations</a></h2>
<p>In addition to those operations required by the concepts that
<tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> models, <tt class="docutils literal"><span class="pre">permutation_iterator</span></tt> provides the
following operations.</p>
@ -207,7 +501,7 @@ permutation_iterator(
</table>
<pre class="literal-block">
template &lt;class ElementIterator, class IndexIterator&gt;
permutation_iterator&lt;ElementIterator, IndexIterator&gt;
permutation_iterator&lt;ElementIterator, IndexIterator&gt;
make_permutation_iterator(ElementIterator e, IndexIterator i);
</pre>
<table class="docutils field-list" frame="void" rules="none">
@ -220,8 +514,11 @@ make_permutation_iterator(ElementIterator e, IndexIterator i);
</table>
</div>
</div>
<div class="section" id="example">
<h1><a class="toc-backref" href="#id7" name="example">Example</a></h1>
<div class="section">
<h1><a class="toc-backref" href="#id7" id="example" name="example">Example</a></h1>
<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
<!-- Software License, Version 1.0. (See accompanying -->
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
<pre class="literal-block">
using namespace boost;
int i = 0;
@ -237,7 +534,7 @@ for(element_range_type::iterator el_it = elements.begin() ; el_it != elements.en
*el_it = std::distance(elements.begin(), el_it);
index_type indices( index_size );
for(index_type::iterator i_it = indices.begin() ; i_it != indices.end() ; ++i_it )
for(index_type::iterator i_it = indices.begin() ; i_it != indices.end() ; ++i_it )
*i_it = element_range_size - index_size + std::distance(indices.begin(), i_it);
std::reverse( indices.begin(), indices.end() );
@ -276,20 +573,15 @@ std::cout &lt;&lt; &quot;\n&quot;;
</pre>
<p>The output is:</p>
<pre class="literal-block">
The original range is : 0 1 2 3 4 5 6 7 8 9
The reindexing scheme is : 9 8 7 6
The permutated range is : 9 8 7 6
Elements at even indices in the permutation : 9 7
Permutation backwards : 6 7 8 9
Iterate backward with stride 2 : 6 8
The original range is : 0 1 2 3 4 5 6 7 8 9
The reindexing scheme is : 9 8 7 6
The permutated range is : 9 8 7 6
Elements at even indices in the permutation : 9 7
Permutation backwards : 6 7 8 9
Iterate backward with stride 2 : 6 8
</pre>
<p>The source code for this example can be found <a class="reference" href="../example/permutation_iter_example.cpp">here</a>.</p>
</div>
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