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<h1 class="title">Lvalue Iterator Concept</h1>

<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
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<p>The <em>Lvalue Iterator</em> concept adds the requirement that the return
type of <tt class="docutils literal"><span class="pre">operator*</span></tt> type be a reference to the value type of the
iterator.</p>
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<tr><th class="head" colspan="3">Lvalue Iterator Requirements</th>
</tr>
<tr><th class="head">Expression</th>
<th class="head">Return Type</th>
<th class="head">Note/Assertion</th>
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<tr><td><tt class="docutils literal"><span class="pre">*a</span></tt></td>
<td><tt class="docutils literal"><span class="pre">T&amp;</span></tt></td>
<td><tt class="docutils literal"><span class="pre">T</span></tt> is <em>cv</em>
<tt class="docutils literal"><span class="pre">iterator_traits&lt;X&gt;::value_type</span></tt>
where <em>cv</em> is an optional
cv-qualification.
pre: <tt class="docutils literal"><span class="pre">a</span></tt> is
dereferenceable. If <tt class="docutils literal"><span class="pre">a</span>
<span class="pre">==</span> <span class="pre">b</span></tt> then <tt class="docutils literal"><span class="pre">*a</span></tt> is
equivalent to <tt class="docutils literal"><span class="pre">*b</span></tt>.</td>
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