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124 lines
6.5 KiB
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="generator" content="Docutils 0.3.0: http://docutils.sourceforge.net/" />
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<title>Permutation Iterator</title>
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<meta name="author" content="Toon Knapen, David Abrahams, Roland Richter, Jeremy Siek" />
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<meta name="organization" content="Boost Consulting, Indiana University Open Systems Lab" />
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<meta name="date" content="2003-09-14" />
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<meta name="copyright" content="Copyright Toon Knapen, David Abrahams, Roland Richter, and Jeremy Siek 2003. All rights reserved" />
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<link rel="stylesheet" href="default.css" type="text/css" />
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</head>
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<body>
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<div class="document" id="permutation-iterator">
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<h1 class="title">Permutation Iterator</h1>
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<table class="docinfo" frame="void" rules="none">
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<col class="docinfo-name" />
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<col class="docinfo-content" />
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<tbody valign="top">
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<tr><th class="docinfo-name">Author:</th>
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<td>Toon Knapen, David Abrahams, Roland Richter, Jeremy Siek</td></tr>
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<tr><th class="docinfo-name">Contact:</th>
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<td><a class="first reference" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="last reference" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a></td></tr>
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<tr><th class="docinfo-name">Organization:</th>
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<td><a class="first reference" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="last reference" href="http://www.osl.iu.edu">Open Systems
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Lab</a></td></tr>
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<tr><th class="docinfo-name">Date:</th>
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<td>2003-09-14</td></tr>
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<tr><th class="docinfo-name">Copyright:</th>
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<td>Copyright Toon Knapen, David Abrahams, Roland Richter, and Jeremy Siek 2003. All rights reserved</td></tr>
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</tbody>
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</table>
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<table class="field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field"><th class="field-name">abstract:</th><td class="field-body"></td>
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</tr>
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</tbody>
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</table>
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<p>The permutation iterator adaptor provides a permuted view of a given
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range. That is, the view includes every element of the given range but
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in a potentially different order.</p>
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<div class="contents topic" id="table-of-contents">
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<p class="topic-title"><a name="table-of-contents">Table of Contents</a></p>
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<ul class="simple">
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<li><a class="reference" href="#introduction" id="id4" name="id4">Introduction</a></li>
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<li><a class="reference" href="#reference" id="id5" name="id5">Reference</a><ul>
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<li><a class="reference" href="#permutation-iterator-requirements" id="id6" name="id6"><tt class="literal"><span class="pre">permutation_iterator</span></tt> requirements</a></li>
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<li><a class="reference" href="#permutation-iterator-operations" id="id7" name="id7"><tt class="literal"><span class="pre">permutation_iterator</span></tt> operations</a></li>
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</ul>
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</li>
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</ul>
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</div>
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<div class="section" id="introduction">
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<h1><a class="toc-backref" href="#id4" name="introduction">Introduction</a></h1>
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<p>The adaptor takes two arguments:</p>
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<blockquote>
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<ul class="simple">
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<li>an iterator to the range V on which the permutation
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will be applied</li>
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<li>the reindexing scheme that defines how the
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elements of V will be permuted.</li>
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</ul>
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</blockquote>
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<p>Note that the permutation iterator is not limited to strict
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permutations of the given range V. The distance between begin and end
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of the reindexing iterators is allowed to be smaller compared to the
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size of the range V, in which case the permutation iterator only
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provides a permutation of a subrange of V. The indexes neither need
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to be unique. In this same context, it must be noted that the past the
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end permutation iterator is completely defined by means of the
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past-the-end iterator to the indices.</p>
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</div>
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<div class="section" id="reference">
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<h1><a class="toc-backref" href="#id5" name="reference">Reference</a></h1>
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<pre class="literal-block">
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template< class ElementIterator
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, class IndexIterator
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, class ValueT = use_default
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, unsigned access = use_default_access
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, class Traversal = use_default
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, class ReferenceT = use_default
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, class DifferenceT = use_default >
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class permutation_iterator
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: public iterator_adaptor<...>
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{
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typedef iterator_adaptor<...>
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friend class iterator_core_access;
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public:
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permutation_iterator();
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explicit permutation_iterator(ElementIterator x, IndexIterator y);
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template< class OEIter, class OIIter, class V, class C, class R, class D >
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permutation_iterator(
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permutation_iterator<OEIter, OIIter, V, C, R, D> const& r
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, typename enable_if_convertible<OEIter, ElementIterator>::type* = 0
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, typename enable_if_convertible<OIIter, IndexIterator>::type* = 0
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);
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};
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</pre>
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<div class="section" id="permutation-iterator-requirements">
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<h2><a class="toc-backref" href="#id6" name="permutation-iterator-requirements"><tt class="literal"><span class="pre">permutation_iterator</span></tt> requirements</a></h2>
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<p><tt class="literal"><span class="pre">ElementIterator</span></tt> must be a model of <a class="reference" href="http://www.sgi.com/tech/stl/RandomAccessIterator.html">RandomAccessIterator</a>.
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<tt class="literal"><span class="pre">IndexIterator</span></tt> must at least be a model <a class="reference" href="http://www.sgi.com/tech/stl/ForwardIterator.html">ForwardIterator</a>. The
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value type of the <tt class="literal"><span class="pre">IndexIterator</span></tt> must be convertible to the
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difference type of <tt class="literal"><span class="pre">ElementIterator</span></tt>.</p>
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</div>
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<div class="section" id="permutation-iterator-operations">
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<h2><a class="toc-backref" href="#id7" name="permutation-iterator-operations"><tt class="literal"><span class="pre">permutation_iterator</span></tt> operations</a></h2>
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<p>The permutation iterator implements the member functions and operators
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required for the <a class="reference" href="http://www.sgi.com/tech/stl/RandomAccessIterator.html">Random Access Iterator</a> concept. However, the
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permutation iterator can only meet the complexity guarantees of the
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same concept as the IndexIterator. Thus for instance, although the
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permutation iterator provides <tt class="literal"><span class="pre">operator+=(distance)</span></tt>, this operation
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will take linear time in case the IndexIterator is a model of
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ForwardIterator instead of amortized constant time.</p>
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</div>
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</div>
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</div>
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</body>
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