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- <title>Concept InputIterator</title>
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- <div class="refentry">
- <a name="InputIterator"></a><div class="titlepage"></div>
- <div class="refnamediv">
- <h2><span class="refentrytitle">Concept InputIterator</span></h2>
- <p>InputIterator</p>
- </div>
- <div class="refsect1">
- <a name="idm45853371055952"></a><h2>Description</h2>
- <p>An input iterator is an iterator that can read through a sequence of
- values. It is single-pass (old values of the iterator cannot be
- re-used), and read-only.</p>
- <p>An input iterator represents a position in a sequence. Therefore, the
- iterator can point into the sequence (returning a value when dereferenced
- and being incrementable), or be off-the-end (and not dereferenceable or
- incrementable).</p>
- </div>
- <div class="refsect1">
- <a name="idm45853371054208"></a><h2>Refinement of</h2>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
- <li class="listitem"><p><a class="link" href="Assignable.html" title="Concept Assignable">Assignable</a></p></li>
- <li class="listitem"><p><a class="link" href="DefaultConstructible.html" title="Concept DefaultConstructible">DefaultConstructible</a></p></li>
- <li class="listitem"><p><a class="link" href="EqualityComparable.html" title="Concept EqualityComparable">EqualityComparable</a></p></li>
- </ul></div>
- </div>
- <div class="refsect1">
- <a name="idm45853371050640"></a><h2>Associated types</h2>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
- <li class="listitem">
- <p><span class="bold"><strong>value_type</strong></span></p>
- <pre class="literallayout">std::iterator_traits<Iter>::value_type</pre>
- <p>The value type of the iterator (not necessarily what
- <code class="computeroutput">*i</code> returns)</p>
- </li>
- <li class="listitem">
- <p><span class="bold"><strong>difference_type</strong></span></p>
- <pre class="literallayout">std::iterator_traits<Iter>::difference_type</pre>
- <p>The difference type of the iterator</p>
- </li>
- <li class="listitem">
- <p><span class="bold"><strong>category</strong></span></p>
- <pre class="literallayout">std::iterator_traits<Iter>::iterator_category</pre>
- <p>The category of the iterator</p>
- </li>
- </ul></div>
- </div>
- <div class="refsect1">
- <a name="idm45853371043104"></a><h2>Notation</h2>
- <div class="variablelist"><dl class="variablelist">
- <dt><span class="term">Iter</span></dt>
- <dd>A type playing the role of iterator-type in the <a class="link" href="InputIterator.html" title="Concept InputIterator">InputIterator</a> concept.</dd>
- <dt>
- <span class="term"><code class="varname">i</code>, </span><span class="term"><code class="varname">j</code></span>
- </dt>
- <dd>Objects of type Iter</dd>
- <dt><span class="term"><code class="varname">x</code></span></dt>
- <dd>Object of type value_type</dd>
- </dl></div>
- </div>
- <div class="refsect1">
- <a name="idm45853365540624"></a><h2>Type expressions</h2>
- <div class="variablelist"><dl class="variablelist">
- <dt><span class="term">Category tag</span></dt>
- <dd><p><span class="type">category</span> must be
- derived from <span class="type">std::input_iterator_tag</span>, a model of <a class="link" href="DefaultConstructible.html" title="Concept DefaultConstructible">DefaultConstructible</a>, and a model of <a class="link" href="CopyConstructible.html" title="Concept CopyConstructible">CopyConstructible</a>.
- </p></dd>
- <dt><span class="term">Value type copy constructibility</span></dt>
- <dd><p><span class="type">value_type</span> must be
- a model of <a class="link" href="CopyConstructible.html" title="Concept CopyConstructible">CopyConstructible</a>.
- </p></dd>
- <dt><span class="term">Difference type properties</span></dt>
- <dd><p><span class="type">difference_type</span> must be
- a model of <a class="link" href="SignedInteger.html" title="Concept SignedInteger">SignedInteger</a>.
- </p></dd>
- </dl></div>
- </div>
- <div class="refsect1">
- <a name="idm45853365534160"></a><h2>Valid expressions</h2>
- <div class="informaltable"><table class="table">
- <colgroup>
- <col>
- <col>
- <col>
- <col>
- <col>
- <col>
- </colgroup>
- <thead><tr>
- <th>Name</th>
- <th>Expression</th>
- <th>Type</th>
- <th>Precondition</th>
- <th>Semantics</th>
- <th>Postcondition</th>
- </tr></thead>
- <tbody>
- <tr>
- <td><p>Dereference</p></td>
- <td><p>*i</p></td>
- <td><p>Convertible to <span class="type">value_type</span></p></td>
- <td><p><code class="computeroutput">i</code> is incrementable (not
- off-the-end)</p></td>
- <td> </td>
- <td> </td>
- </tr>
- <tr>
- <td><p>Preincrement</p></td>
- <td><p>++i</p></td>
- <td><p><span class="type">Iter &</span></p></td>
- <td><p><code class="computeroutput">i</code> is incrementable (not
- off-the-end)</p></td>
- <td> </td>
- <td> </td>
- </tr>
- <tr>
- <td><p>Postincrement</p></td>
- <td><p>i++</p></td>
- <td><p></p></td>
- <td><p><code class="computeroutput">i</code> is incrementable (not
- off-the-end)</p></td>
- <td><p>Equivalent to <code class="computeroutput">(void)(++i)</code></p></td>
- <td><p><code class="computeroutput">i</code> is dereferenceable or
- off-the-end</p></td>
- </tr>
- <tr>
- <td><p>Postincrement and dereference</p></td>
- <td><p>*i++</p></td>
- <td><p>Convertible to <span class="type">value_type</span></p></td>
- <td><p><code class="computeroutput">i</code> is incrementable (not
- off-the-end)</p></td>
- <td><p>Equivalent to <code class="computeroutput">{value_type t = *i; ++i; return t;}</code></p></td>
- <td><p><code class="computeroutput">i</code> is dereferenceable or
- off-the-end</p></td>
- </tr>
- </tbody>
- </table></div>
- </div>
- <div class="refsect1">
- <a name="idm45853365518176"></a><h2>Complexity</h2>
- <p>
- All iterator operations must take amortized constant time.
- </p>
- </div>
- <div class="refsect1">
- <a name="idm45853365517536"></a><h2>Models</h2>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><span class="simplelist"><span class="type">std::istream_iterator</span></span></li></ul></div>
- </div>
- <div class="refsect1">
- <a name="idm45853365516144"></a><h2>See also</h2>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
- <li class="listitem"><p><a class="link" href="DefaultConstructible.html" title="Concept DefaultConstructible">DefaultConstructible</a></p></li>
- <li class="listitem"><p><a class="link" href="EqualityComparable.html" title="Concept EqualityComparable">EqualityComparable</a></p></li>
- <li class="listitem"><p><a class="link" href="ForwardIterator.html" title="Concept ForwardIterator">ForwardIterator</a></p></li>
- <li class="listitem"><p><a class="link" href="OutputIterator.html" title="Concept OutputIterator">OutputIterator</a></p></li>
- </ul></div>
- </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 © 2001, 2002 Indiana University<br>Copyright © 2000, 2001 University of Notre Dame du Lac<br>Copyright © 2000 Jeremy Siek, Lie-Quan Lee, Andrew Lumsdaine<br>Copyright © 1996-1999 Silicon Graphics Computer Systems, Inc.<br>Copyright © 1994 Hewlett-Packard Company<p>Distributed under the Boost Software License, Version 1.0.
- (See accompanying file <code class="filename">LICENSE_1_0.txt</code> 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>
- <p>This product includes software developed at the University
- of Notre Dame and the Pervasive Technology Labs at Indiana
- University. For technical information contact Andrew Lumsdaine
- at the Pervasive Technology Labs at Indiana University. For
- administrative and license questions contact the Advanced
- Research and Technology Institute at 351 West 10th Street.
- Indianapolis, Indiana 46202, phone 317-278-4100, fax
- 317-274-5902.</p>
- <p>Some concepts based on versions from the MTL draft manual
- and Boost Graph and Property Map documentation, the SGI Standard
- Template Library documentation and the Hewlett-Packard STL,
- under the following license:
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