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

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<p>A class or built-in type <tt class="docutils literal"><span class="pre">X</span></tt> models the <em>Readable Iterator</em> concept
for value type <tt class="docutils literal"><span class="pre">T</span></tt> if, in addition to <tt class="docutils literal"><span class="pre">X</span></tt> being Assignable and
Copy Constructible, the following expressions are valid and respect
the stated semantics. <tt class="docutils literal"><span class="pre">U</span></tt> is the type of any specified member of
type <tt class="docutils literal"><span class="pre">T</span></tt>.</p>
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<tr><th class="head" colspan="3">Readable Iterator Requirements (in addition to Assignable and Copy Constructible)</th>
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<tr><th class="head">Expression</th>
<th class="head">Return Type</th>
<th class="head">Note/Precondition</th>
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<tr><td><tt class="docutils literal"><span class="pre">iterator_traits&lt;X&gt;::value_type</span></tt></td>
<td><tt class="docutils literal"><span class="pre">T</span></tt></td>
<td>Any non-reference,
non-cv-qualified type</td>
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<tr><td><tt class="docutils literal"><span class="pre">*a</span></tt></td>
<td>Convertible to <tt class="docutils literal"><span class="pre">T</span></tt></td>
<td><dl class="first last docutils">
<dt>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></dt>
<dd>is equivalent to <tt class="docutils literal"><span class="pre">*b</span></tt>.</dd>
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<tr><td><tt class="docutils literal"><span class="pre">a-&gt;m</span></tt></td>
<td><tt class="docutils literal"><span class="pre">U&amp;</span></tt></td>
<td>pre: <tt class="docutils literal"><span class="pre">pre:</span> <span class="pre">(*a).m</span></tt> is well-defined. Equivalent to <tt class="docutils literal"><span class="pre">(*a).m</span></tt>.</td>
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