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346 lines
19 KiB
HTML
346 lines
19 KiB
HTML
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<?xml version="1.0" encoding="utf-8" ?>
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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 0.5: http://docutils.sourceforge.net/" />
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<title>Indirect Iterator</title>
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<meta name="author" content="David Abrahams, Jeremy Siek, Thomas Witt" />
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<meta name="organization" content="Boost Consulting, Indiana University Open Systems Lab, University of Hanover Institute for Transport Railway Operation and Construction" />
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<meta name="date" content="2006-09-11" />
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<meta name="copyright" content="Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003." />
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<link rel="stylesheet" href="../../../rst.css" type="text/css" />
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</head>
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<body>
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<div class="document" id="indirect-iterator">
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<h1 class="title">Indirect 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>David Abrahams, Jeremy Siek, Thomas Witt</td></tr>
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<tr><th class="docinfo-name">Contact:</th>
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<td><a class="first reference external" href="mailto:dave@boost-consulting.com">dave@boost-consulting.com</a>, <a class="reference external" href="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</a>, <a class="last reference external" href="mailto:witt@ive.uni-hannover.de">witt@ive.uni-hannover.de</a></td></tr>
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<tr><th class="docinfo-name">Organization:</th>
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<td><a class="first reference external" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference external" href="http://www.osl.iu.edu">Open Systems
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Lab</a>, University of Hanover <a class="last reference external" href="http://www.ive.uni-hannover.de">Institute for Transport
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Railway Operation and Construction</a></td></tr>
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<tr><th class="docinfo-name">Date:</th>
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<td>2006-09-11</td></tr>
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<tr><th class="docinfo-name">Copyright:</th>
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<td>Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.</td></tr>
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</tbody>
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</table>
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<!-- Distributed under the Boost -->
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<!-- Software License, Version 1.0. (See accompanying -->
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<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
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<table class="docutils 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"><!-- Copyright David Abrahams 2006. Distributed under the Boost -->
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<!-- Software License, Version 1.0. (See accompanying -->
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<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
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<tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> adapts an iterator by applying an
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<em>extra</em> dereference inside of <tt class="docutils literal"><span class="pre">operator*()</span></tt>. For example, this
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iterator adaptor makes it possible to view a container of pointers
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(e.g. <tt class="docutils literal"><span class="pre">list<foo*></span></tt>) as if it were a container of the pointed-to type
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(e.g. <tt class="docutils literal"><span class="pre">list<foo></span></tt>). <tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> depends on two
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auxiliary traits, <tt class="docutils literal"><span class="pre">pointee</span></tt> and <tt class="docutils literal"><span class="pre">indirect_reference</span></tt>, to
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provide support for underlying iterators whose <tt class="docutils literal"><span class="pre">value_type</span></tt> is
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not an iterator.</td>
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</tr>
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</tbody>
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</table>
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<div class="contents topic" id="table-of-contents">
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<p class="topic-title first">Table of Contents</p>
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<ul class="simple">
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<li><a class="reference internal" href="#indirect-iterator-synopsis" id="id2"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> synopsis</a></li>
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<li><a class="reference internal" href="#indirect-iterator-requirements" id="id3"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> requirements</a></li>
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<li><a class="reference internal" href="#indirect-iterator-models" id="id4"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> models</a></li>
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<li><a class="reference internal" href="#indirect-iterator-operations" id="id5"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> operations</a></li>
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<li><a class="reference internal" href="#example" id="id6">Example</a></li>
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</ul>
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</div>
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<div class="section" id="indirect-iterator-synopsis">
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<h1><a class="toc-backref" href="#id2"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> synopsis</a></h1>
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<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
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<!-- Software License, Version 1.0. (See accompanying -->
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<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
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<pre class="literal-block">
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template <
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class Iterator
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, class Value = use_default
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, class CategoryOrTraversal = use_default
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, class Reference = use_default
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, class Difference = use_default
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>
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class indirect_iterator
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{
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public:
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typedef /* see below */ value_type;
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typedef /* see below */ reference;
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typedef /* see below */ pointer;
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typedef /* see below */ difference_type;
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typedef /* see below */ iterator_category;
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indirect_iterator();
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indirect_iterator(Iterator x);
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template <
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class Iterator2, class Value2, class Category2
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, class Reference2, class Difference2
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>
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indirect_iterator(
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indirect_iterator<
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Iterator2, Value2, Category2, Reference2, Difference2
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> const& y
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, typename enable_if_convertible<Iterator2, Iterator>::type* = 0 // exposition
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);
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Iterator const& base() const;
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reference operator*() const;
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indirect_iterator& operator++();
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indirect_iterator& operator--();
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private:
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Iterator m_iterator; // exposition
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};
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</pre>
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<p>The member types of <tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> are defined according to
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the following pseudo-code, where <tt class="docutils literal"><span class="pre">V</span></tt> is
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<tt class="docutils literal"><span class="pre">iterator_traits<Iterator>::value_type</span></tt></p>
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<pre class="literal-block">
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if (Value is use_default) then
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typedef remove_const<pointee<V>::type>::type value_type;
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else
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typedef remove_const<Value>::type value_type;
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if (Reference is use_default) then
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if (Value is use_default) then
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typedef indirect_reference<V>::type reference;
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else
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typedef Value& reference;
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else
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typedef Reference reference;
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if (Value is use_default) then
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typedef pointee<V>::type* pointer;
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else
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typedef Value* pointer;
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if (Difference is use_default)
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typedef iterator_traits<Iterator>::difference_type difference_type;
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else
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typedef Difference difference_type;
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if (CategoryOrTraversal is use_default)
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typedef <em>iterator-category</em> (
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iterator_traversal<Iterator>::type,``reference``,``value_type``
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) iterator_category;
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else
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typedef <em>iterator-category</em> (
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CategoryOrTraversal,``reference``,``value_type``
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) iterator_category;
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</pre>
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</div>
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<div class="section" id="indirect-iterator-requirements">
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<h1><a class="toc-backref" href="#id3"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> requirements</a></h1>
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<p>The expression <tt class="docutils literal"><span class="pre">*v</span></tt>, where <tt class="docutils literal"><span class="pre">v</span></tt> is an object of
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<tt class="docutils literal"><span class="pre">iterator_traits<Iterator>::value_type</span></tt>, shall be valid
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expression and convertible to <tt class="docutils literal"><span class="pre">reference</span></tt>. <tt class="docutils literal"><span class="pre">Iterator</span></tt> shall
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model the traversal concept indicated by <tt class="docutils literal"><span class="pre">iterator_category</span></tt>.
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<tt class="docutils literal"><span class="pre">Value</span></tt>, <tt class="docutils literal"><span class="pre">Reference</span></tt>, and <tt class="docutils literal"><span class="pre">Difference</span></tt> shall be chosen so
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that <tt class="docutils literal"><span class="pre">value_type</span></tt>, <tt class="docutils literal"><span class="pre">reference</span></tt>, and <tt class="docutils literal"><span class="pre">difference_type</span></tt> meet
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the requirements indicated by <tt class="docutils literal"><span class="pre">iterator_category</span></tt>.</p>
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<p>[Note: there are further requirements on the
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<tt class="docutils literal"><span class="pre">iterator_traits<Iterator>::value_type</span></tt> if the <tt class="docutils literal"><span class="pre">Value</span></tt>
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parameter is not <tt class="docutils literal"><span class="pre">use_default</span></tt>, as implied by the algorithm for
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deducing the default for the <tt class="docutils literal"><span class="pre">value_type</span></tt> member.]</p>
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</div>
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<div class="section" id="indirect-iterator-models">
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<h1><a class="toc-backref" href="#id4"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> models</a></h1>
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<p>In addition to the concepts indicated by <tt class="docutils literal"><span class="pre">iterator_category</span></tt>
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and by <tt class="docutils literal"><span class="pre">iterator_traversal<indirect_iterator>::type</span></tt>, a
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specialization of <tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> models the following
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concepts, Where <tt class="docutils literal"><span class="pre">v</span></tt> is an object of
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<tt class="docutils literal"><span class="pre">iterator_traits<Iterator>::value_type</span></tt>:</p>
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<blockquote>
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<ul class="simple">
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<li>Readable Iterator if <tt class="docutils literal"><span class="pre">reference(*v)</span></tt> is convertible to
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<tt class="docutils literal"><span class="pre">value_type</span></tt>.</li>
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<li>Writable Iterator if <tt class="docutils literal"><span class="pre">reference(*v)</span> <span class="pre">=</span> <span class="pre">t</span></tt> is a valid
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expression (where <tt class="docutils literal"><span class="pre">t</span></tt> is an object of type
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<tt class="docutils literal"><span class="pre">indirect_iterator::value_type</span></tt>)</li>
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<li>Lvalue Iterator if <tt class="docutils literal"><span class="pre">reference</span></tt> is a reference type.</li>
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</ul>
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</blockquote>
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<p><tt class="docutils literal"><span class="pre">indirect_iterator<X,V1,C1,R1,D1></span></tt> is interoperable with
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<tt class="docutils literal"><span class="pre">indirect_iterator<Y,V2,C2,R2,D2></span></tt> if and only if <tt class="docutils literal"><span class="pre">X</span></tt> is
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interoperable with <tt class="docutils literal"><span class="pre">Y</span></tt>.</p>
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</div>
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<div class="section" id="indirect-iterator-operations">
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<h1><a class="toc-backref" href="#id5"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> operations</a></h1>
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<p>In addition to the operations required by the concepts described
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above, specializations of <tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> provide the
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following operations.</p>
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<p><tt class="docutils literal"><span class="pre">indirect_iterator();</span></tt></p>
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<table class="docutils 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">Requires:</th><td class="field-body"><tt class="docutils literal"><span class="pre">Iterator</span></tt> must be Default Constructible.</td>
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</tr>
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<tr class="field"><th class="field-name">Effects:</th><td class="field-body">Constructs an instance of <tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> with
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a default-constructed <tt class="docutils literal"><span class="pre">m_iterator</span></tt>.</td>
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</tr>
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</tbody>
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</table>
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<p><tt class="docutils literal"><span class="pre">indirect_iterator(Iterator</span> <span class="pre">x);</span></tt></p>
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<table class="docutils 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">Effects:</th><td class="field-body">Constructs an instance of <tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> with
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<tt class="docutils literal"><span class="pre">m_iterator</span></tt> copy constructed from <tt class="docutils literal"><span class="pre">x</span></tt>.</td>
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</tr>
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</tbody>
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</table>
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<pre class="literal-block">
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template <
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class Iterator2, class Value2, unsigned Access, class Traversal
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, class Reference2, class Difference2
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>
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indirect_iterator(
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indirect_iterator<
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Iterator2, Value2, Access, Traversal, Reference2, Difference2
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> const& y
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, typename enable_if_convertible<Iterator2, Iterator>::type* = 0 // exposition
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);
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</pre>
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<table class="docutils 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">Requires:</th><td class="field-body"><tt class="docutils literal"><span class="pre">Iterator2</span></tt> is implicitly convertible to <tt class="docutils literal"><span class="pre">Iterator</span></tt>.</td>
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</tr>
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<tr class="field"><th class="field-name">Effects:</th><td class="field-body">Constructs an instance of <tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> whose
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<tt class="docutils literal"><span class="pre">m_iterator</span></tt> subobject is constructed from <tt class="docutils literal"><span class="pre">y.base()</span></tt>.</td>
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</tr>
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</tbody>
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</table>
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<p><tt class="docutils literal"><span class="pre">Iterator</span> <span class="pre">const&</span> <span class="pre">base()</span> <span class="pre">const;</span></tt></p>
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<table class="docutils 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">Returns:</th><td class="field-body"><tt class="docutils literal"><span class="pre">m_iterator</span></tt></td>
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</tr>
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</tbody>
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</table>
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<p><tt class="docutils literal"><span class="pre">reference</span> <span class="pre">operator*()</span> <span class="pre">const;</span></tt></p>
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<table class="docutils 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">Returns:</th><td class="field-body"><tt class="docutils literal"><span class="pre">**m_iterator</span></tt></td>
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</tr>
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</tbody>
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</table>
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<p><tt class="docutils literal"><span class="pre">indirect_iterator&</span> <span class="pre">operator++();</span></tt></p>
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<table class="docutils 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">Effects:</th><td class="field-body"><tt class="docutils literal"><span class="pre">++m_iterator</span></tt></td>
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</tr>
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<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><tt class="docutils literal"><span class="pre">*this</span></tt></td>
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</tr>
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</tbody>
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</table>
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<p><tt class="docutils literal"><span class="pre">indirect_iterator&</span> <span class="pre">operator--();</span></tt></p>
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<table class="docutils 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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||
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<tbody valign="top">
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||
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<tr class="field"><th class="field-name">Effects:</th><td class="field-body"><tt class="docutils literal"><span class="pre">--m_iterator</span></tt></td>
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||
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</tr>
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||
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|
<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><tt class="docutils literal"><span class="pre">*this</span></tt></td>
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||
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</tr>
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||
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</tbody>
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||
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</table>
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||
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|
<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
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||
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<!-- Software License, Version 1.0. (See accompanying -->
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||
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|
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
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||
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|
</div>
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||
|
|
<div class="section" id="example">
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||
|
|
<h1><a class="toc-backref" href="#id6">Example</a></h1>
|
||
|
|
<p>This example prints an array of characters, using
|
||
|
|
<tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> to access the array of characters through an
|
||
|
|
array of pointers. Next <tt class="docutils literal"><span class="pre">indirect_iterator</span></tt> is used with the
|
||
|
|
<tt class="docutils literal"><span class="pre">transform</span></tt> algorithm to copy the characters (incremented by one) to
|
||
|
|
another array. A constant indirect iterator is used for the source and
|
||
|
|
a mutable indirect iterator is used for the destination. The last part
|
||
|
|
of the example prints the original array of characters, but this time
|
||
|
|
using the <tt class="docutils literal"><span class="pre">make_indirect_iterator</span></tt> helper function.</p>
|
||
|
|
<pre class="literal-block">
|
||
|
|
char characters[] = "abcdefg";
|
||
|
|
const int N = sizeof(characters)/sizeof(char) - 1; // -1 since characters has a null char
|
||
|
|
char* pointers_to_chars[N]; // at the end.
|
||
|
|
for (int i = 0; i < N; ++i)
|
||
|
|
pointers_to_chars[i] = &characters[i];
|
||
|
|
|
||
|
|
// Example of using indirect_iterator
|
||
|
|
|
||
|
|
boost::indirect_iterator<char**, char>
|
||
|
|
indirect_first(pointers_to_chars), indirect_last(pointers_to_chars + N);
|
||
|
|
|
||
|
|
std::copy(indirect_first, indirect_last, std::ostream_iterator<char>(std::cout, ","));
|
||
|
|
std::cout << std::endl;
|
||
|
|
|
||
|
|
|
||
|
|
// Example of making mutable and constant indirect iterators
|
||
|
|
|
||
|
|
char mutable_characters[N];
|
||
|
|
char* pointers_to_mutable_chars[N];
|
||
|
|
for (int j = 0; j < N; ++j)
|
||
|
|
pointers_to_mutable_chars[j] = &mutable_characters[j];
|
||
|
|
|
||
|
|
boost::indirect_iterator<char* const*> mutable_indirect_first(pointers_to_mutable_chars),
|
||
|
|
mutable_indirect_last(pointers_to_mutable_chars + N);
|
||
|
|
boost::indirect_iterator<char* const*, char const> const_indirect_first(pointers_to_chars),
|
||
|
|
const_indirect_last(pointers_to_chars + N);
|
||
|
|
|
||
|
|
std::transform(const_indirect_first, const_indirect_last,
|
||
|
|
mutable_indirect_first, std::bind1st(std::plus<char>(), 1));
|
||
|
|
|
||
|
|
std::copy(mutable_indirect_first, mutable_indirect_last,
|
||
|
|
std::ostream_iterator<char>(std::cout, ","));
|
||
|
|
std::cout << std::endl;
|
||
|
|
|
||
|
|
|
||
|
|
// Example of using make_indirect_iterator()
|
||
|
|
|
||
|
|
std::copy(boost::make_indirect_iterator(pointers_to_chars),
|
||
|
|
boost::make_indirect_iterator(pointers_to_chars + N),
|
||
|
|
std::ostream_iterator<char>(std::cout, ","));
|
||
|
|
std::cout << std::endl;
|
||
|
|
</pre>
|
||
|
|
<p>The output is:</p>
|
||
|
|
<pre class="literal-block">
|
||
|
|
a,b,c,d,e,f,g,
|
||
|
|
b,c,d,e,f,g,h,
|
||
|
|
a,b,c,d,e,f,g,
|
||
|
|
</pre>
|
||
|
|
<p>The source code for this example can be found <a class="reference external" href="../example/indirect_iterator_example.cpp">here</a>.</p>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div class="footer">
|
||
|
|
<hr class="footer" />
|
||
|
|
<a class="reference external" href="indirect_iterator.rst">View document source</a>.
|
||
|
|
Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</body>
|
||
|
|
</html>
|