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<h1 class="title">Single Pass Iterator 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>Single Pass Iterator</em>
concept if the following expressions are valid and respect the stated
semantics.</p>
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<tr><th class="head" colspan="3">Single Pass Iterator Requirements (in addition to Incrementable Iterator and Equality
Comparable)</th>
</tr>
<tr><th class="head">Expression</th>
<th class="head">Return Type</th>
<th class="head">Assertion/Semantics /
Pre-/Post-condition</th>
</tr>
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<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>pre: <tt class="docutils literal"><span class="pre">r</span></tt> is
dereferenceable; post:
<tt class="docutils literal"><span class="pre">r</span></tt> is dereferenceable or
<tt class="docutils literal"><span class="pre">r</span></tt> is past-the-end</td>
</tr>
<tr><td><tt class="docutils literal"><span class="pre">a</span> <span class="pre">==</span> <span class="pre">b</span></tt></td>
<td>convertible to <tt class="docutils literal"><span class="pre">bool</span></tt></td>
<td><tt class="docutils literal"><span class="pre">==</span></tt> is an equivalence
relation over its domain</td>
</tr>
<tr><td><tt class="docutils literal"><span class="pre">a</span> <span class="pre">!=</span> <span class="pre">b</span></tt></td>
<td>convertible to <tt class="docutils literal"><span class="pre">bool</span></tt></td>
<td><tt class="docutils literal"><span class="pre">!(a</span> <span class="pre">==</span> <span class="pre">b)</span></tt></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">single_pass_traversal_tag</span></tt></td>
<td> </td>
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