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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="iterator.utilities.traits"></a><a class="link" href="traits.html" title="Iterator Traits">Iterator Traits</a>
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</h3></div></div></div>
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<p>
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<code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">iterator_traits</span></code> provides access to five
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associated types of any iterator: its <code class="computeroutput"><span class="identifier">value_type</span></code>,
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<code class="computeroutput"><span class="identifier">reference</span></code>, <code class="computeroutput"><span class="identifier">pointer</span></code>, <code class="computeroutput"><span class="identifier">iterator_category</span></code>,
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and <code class="computeroutput"><span class="identifier">difference_type</span></code>. Unfortunately,
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such a "multi-valued" traits template can be difficult to use in
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a metaprogramming context. <code class="computeroutput"><span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">iterator_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code>
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provides access to these types using a standard metafunctions_.
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</p>
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<h3>
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<a name="iterator.utilities.traits.h0"></a>
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<span class="phrase"><a name="iterator.utilities.traits.synopsis"></a></span><a class="link" href="traits.html#iterator.utilities.traits.synopsis">Synopsis</a>
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</h3>
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<p>
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Header <code class="computeroutput"><span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">iterator_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code>:
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</p>
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<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Iterator</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">iterator_value</span>
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<span class="special">{</span>
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<span class="keyword">typedef</span> <span class="keyword">typename</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="identifier">Iterator</span><span class="special">>::</span><span class="identifier">value_type</span>
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<span class="identifier">type</span><span class="special">;</span>
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<span class="special">};</span>
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Iterator</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">iterator_reference</span>
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<span class="special">{</span>
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<span class="keyword">typedef</span> <span class="keyword">typename</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="identifier">Iterator</span><span class="special">>::</span><span class="identifier">reference</span>
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<span class="identifier">type</span><span class="special">;</span>
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<span class="special">};</span>
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Iterator</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">iterator_pointer</span>
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<span class="special">{</span>
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<span class="keyword">typedef</span> <span class="keyword">typename</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="identifier">Iterator</span><span class="special">>::</span><span class="identifier">pointer</span>
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<span class="identifier">type</span><span class="special">;</span>
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<span class="special">};</span>
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Iterator</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">iterator_difference</span>
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<span class="special">{</span>
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<span class="keyword">typedef</span> <span class="keyword">typename</span>
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<span class="identifier">detail</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="identifier">Iterator</span><span class="special">>::</span><span class="identifier">difference_type</span>
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<span class="identifier">type</span><span class="special">;</span>
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<span class="special">};</span>
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Iterator</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">iterator_category</span>
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<span class="special">{</span>
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<span class="keyword">typedef</span> <span class="keyword">typename</span>
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<span class="identifier">detail</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="identifier">Iterator</span><span class="special">>::</span><span class="identifier">iterator_category</span>
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<span class="identifier">type</span><span class="special">;</span>
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<span class="special">};</span>
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</pre>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003, 2005 David Abrahams Jeremy Siek Thomas
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Witt<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <ulink url="http://www.boost.org/LICENSE_1_0.txt">
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http://www.boost.org/LICENSE_1_0.txt </ulink>)
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