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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>Transform Iterator</title>
<meta name="author" content="David Abrahams, Jeremy Siek, Thomas Witt" />
<meta name="organization" content="Boost Consulting, Indiana University Open Systems Lab, University of Hanover Institute for Transport Railway Operation and Construction" />
<meta name="date" content="2004-11-01" />
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<div class="document" id="transform-iterator">
@ -32,18 +314,24 @@ Railway Operation and Construction</a></td></tr>
<td>Copyright David Abrahams, Jeremy Siek, and Thomas Witt 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 transform iterator adapts an iterator by modifying the
<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 transform iterator adapts an iterator by modifying the
<tt class="docutils literal"><span class="pre">operator*</span></tt> to apply a function object to the result of
dereferencing the iterator and returning the result.</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="#transform-iterator-synopsis" id="id2" name="id2"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> synopsis</a></li>
<li><a class="reference" href="#transform-iterator-requirements" id="id3" name="id3"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> requirements</a></li>
@ -52,13 +340,16 @@ dereferencing the iterator and returning the result.</td>
<li><a class="reference" href="#example" id="id6" name="id6">Example</a></li>
</ul>
</div>
<div class="section" id="transform-iterator-synopsis">
<h1><a class="toc-backref" href="#id2" name="transform-iterator-synopsis"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> synopsis</a></h1>
<div class="section">
<h1><a class="toc-backref" href="#id2" id="transform-iterator-synopsis" name="transform-iterator-synopsis"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> synopsis</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) -->
<!-- Version 1.3 of this document was accepted for TR1 -->
<pre class="literal-block">
template &lt;class UnaryFunction,
class Iterator,
class Reference = use_default,
class Iterator,
class Reference = use_default,
class Value = use_default&gt;
class transform_iterator
{
@ -105,8 +396,8 @@ convertible to <tt class="docutils literal"><span class="pre">forward_iterator_t
model Readable Lvalue Iterator then <tt class="docutils literal"><span class="pre">iterator_category</span></tt> is
convertible to <tt class="docutils literal"><span class="pre">input_iterator_tag</span></tt>.</p>
</div>
<div class="section" id="transform-iterator-requirements">
<h1><a class="toc-backref" href="#id3" name="transform-iterator-requirements"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> requirements</a></h1>
<div class="section">
<h1><a class="toc-backref" href="#id3" id="transform-iterator-requirements" name="transform-iterator-requirements"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> requirements</a></h1>
<p>The type <tt class="docutils literal"><span class="pre">UnaryFunction</span></tt> must be Assignable, Copy Constructible, and
the expression <tt class="docutils literal"><span class="pre">f(*i)</span></tt> must be valid where <tt class="docutils literal"><span class="pre">f</span></tt> is an object of
type <tt class="docutils literal"><span class="pre">UnaryFunction</span></tt>, <tt class="docutils literal"><span class="pre">i</span></tt> is an object of type <tt class="docutils literal"><span class="pre">Iterator</span></tt>, and
@ -114,8 +405,8 @@ where the type of <tt class="docutils literal"><span class="pre">f(*i)</span></t
<tt class="docutils literal"><span class="pre">result_of&lt;UnaryFunction(iterator_traits&lt;Iterator&gt;::reference)&gt;::type</span></tt>.</p>
<p>The argument <tt class="docutils literal"><span class="pre">Iterator</span></tt> shall model Readable Iterator.</p>
</div>
<div class="section" id="transform-iterator-models">
<h1><a class="toc-backref" href="#id4" name="transform-iterator-models"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> models</a></h1>
<div class="section">
<h1><a class="toc-backref" href="#id4" id="transform-iterator-models" name="transform-iterator-models"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> models</a></h1>
<p>The resulting <tt class="docutils literal"><span class="pre">transform_iterator</span></tt> models the most refined of the
following that is also modeled by <tt class="docutils literal"><span class="pre">Iterator</span></tt>.</p>
<blockquote>
@ -136,8 +427,8 @@ the <tt class="docutils literal"><span class="pre">Iterator</span></tt> argument
<col width="53%" />
</colgroup>
<thead valign="bottom">
<tr><th>If <tt class="docutils literal"><span class="pre">Iterator</span></tt> models</th>
<th>then <tt class="docutils literal"><span class="pre">transform_iterator</span></tt> models</th>
<tr><th class="head">If <tt class="docutils literal"><span class="pre">Iterator</span></tt> models</th>
<th class="head">then <tt class="docutils literal"><span class="pre">transform_iterator</span></tt> models</th>
</tr>
</thead>
<tbody valign="top">
@ -161,8 +452,8 @@ mutable iterator (as defined in the old iterator requirements).</p>
<tt class="docutils literal"><span class="pre">transform_iterator&lt;F2,</span> <span class="pre">Y,</span> <span class="pre">R2,</span> <span class="pre">V2&gt;</span></tt> if and only if <tt class="docutils literal"><span class="pre">X</span></tt> is
interoperable with <tt class="docutils literal"><span class="pre">Y</span></tt>.</p>
</div>
<div class="section" id="transform-iterator-operations">
<h1><a class="toc-backref" href="#id5" name="transform-iterator-operations"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> operations</a></h1>
<div class="section">
<h1><a class="toc-backref" href="#id5" id="transform-iterator-operations" name="transform-iterator-operations"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> operations</a></h1>
<p>In addition to the operations required by the concepts modeled by
<tt class="docutils literal"><span class="pre">transform_iterator</span></tt>, <tt class="docutils literal"><span class="pre">transform_iterator</span></tt> provides the following
operations.</p>
@ -255,6 +546,9 @@ initialized to <tt class="docutils literal"><span class="pre">t.functor()</span>
</tr>
</tbody>
</table>
<!-- 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 UnaryFunction, class Iterator&gt;
transform_iterator&lt;UnaryFunction, Iterator&gt;
@ -283,9 +577,12 @@ default constructed and <tt class="docutils literal"><span class="pre">m_iterato
</tr>
</tbody>
</table>
<!-- 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) -->
</div>
<div class="section" id="example">
<h1><a class="toc-backref" href="#id6" name="example">Example</a></h1>
<div class="section">
<h1><a class="toc-backref" href="#id6" id="example" name="example">Example</a></h1>
<p>This is a simple example of using the transform_iterators class to
generate iterators that multiply (or add to) the value returned by
dereferencing the iterator. It would be cooler to use lambda library
@ -314,17 +611,12 @@ std::cout &lt;&lt; std::endl;
<p>The output is:</p>
<pre class="literal-block">
multiplying the array by 2:
2 4 6 8 10 12 14 16
2 4 6 8 10 12 14 16
adding 4 to each element in the array:
5 6 7 8 9 10 11 12
</pre>
<p>The source code for this example can be found <a class="reference" href="../example/transform_iterator_example.cpp">here</a>.</p>
</div>
</div>
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