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<h1 class="title">Forward Traversal Concept</h1>
<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
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<p>A class or built-in type <tt class="docutils literal"><span class="pre">X</span></tt> models the <em>Forward Traversal</em>
concept if, in addition to <tt class="docutils literal"><span class="pre">X</span></tt> meeting the requirements of Default
Constructible and Single Pass Iterator, the following expressions are
valid and respect the stated semantics.</p>
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<tr><th class="head" colspan="3">Forward Traversal Iterator Requirements (in addition to Default Constructible and Single Pass Iterator)</th>
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<tr><th class="head">Expression</th>
<th class="head">Return Type</th>
<th class="head">Assertion/Note</th>
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<tr><td><tt class="docutils literal"><span class="pre">X</span> <span class="pre">u;</span></tt></td>
<td><tt class="docutils literal"><span class="pre">X&</span></tt></td>
<td>note: <tt class="docutils literal"><span class="pre">u</span></tt> may have a
singular value.</td>
</tr>
<tr><td><tt class="docutils literal"><span class="pre">++r</span></tt></td>
<td><tt class="docutils literal"><span class="pre">X&</span></tt></td>
<td><tt class="docutils literal"><span class="pre">r</span> <span class="pre">==</span> <span class="pre">s</span></tt> and <tt class="docutils literal"><span class="pre">r</span></tt> is
dereferenceable implies
<tt class="docutils literal"><span class="pre">++r</span> <span class="pre">==</span> <span class="pre">++s.</span></tt></td>
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<tr><td><tt class="docutils literal"><span class="pre">iterator_traits<X>::difference_type</span></tt></td>
<td>A signed integral type representing
the distance between iterators</td>
<td> </td>
</tr>
<tr><td><tt class="docutils literal"><span class="pre">iterator_traversal<X>::type</span></tt></td>
<td>Convertible to
<tt class="docutils literal"><span class="pre">forward_traversal_tag</span></tt></td>
<td> </td>
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