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<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="boost_typeerasure.predef"></a><a class="link" href="predef.html" title="Predefined Concepts">Predefined Concepts</a>
</h2></div></div></div>
<p>
In the following tables, <code class="computeroutput"><span class="identifier">T</span></code>
and <code class="computeroutput"><span class="identifier">U</span></code> are the types that the
operation applies to, <code class="computeroutput"><span class="identifier">R</span></code> is
the result type. <code class="computeroutput"><span class="identifier">T</span></code> always defaults
to <code class="computeroutput"><span class="identifier">_self</span></code> to match the default
behavior of any. These concepts assume normal semantics. Thus, comparison operators
always return bool, and references will be added to the arguments and results
as appropriate.
</p>
<p>
Except as otherwise noted, primitive concepts defined by the library can be
specialized to provide concept maps. <code class="computeroutput"><a class="link" href="../boost/type_erasure/copy_constructible.html" title="Struct template copy_constructible">copy_constructible</a></code>,
and the iterator concepts cannot be specialized because they are composites.
<code class="computeroutput"><a class="link" href="../boost/type_erasure/constructible.html" title="Struct template constructible">constructible</a></code>,
<code class="computeroutput"><a class="link" href="../boost/type_erasure/destructible.html" title="Struct template destructible">destructible</a></code>,
<code class="computeroutput"><a class="link" href="../boost/type_erasure/typeid_.html" title="Struct template typeid_">typeid_</a></code>, and <code class="computeroutput"><a class="link" href="../boost/type_erasure/same_type.html" title="Struct template same_type">same_type</a></code> cannot be specialized
because they require special handling in the library.
</p>
<div class="table">
<a name="boost_typeerasure.predef.special"></a><p class="title"><b>Table 34.1. Special Members</b></p>
<div class="table-contents"><table class="table" summary="Special Members">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
concept
</p>
</th>
<th>
<p>
notes
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/constructible.html" title="Struct template constructible">constructible</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">Sig</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/copy_constructible.html" title="Struct template copy_constructible">copy_constructible</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/destructible.html" title="Struct template destructible">destructible</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/assignable.html" title="Struct template assignable">assignable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/typeid_.html" title="Struct template typeid_">typeid_</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><div class="table">
<a name="boost_typeerasure.predef.unary"></a><p class="title"><b>Table 34.2. Unary Operators</b></p>
<div class="table-contents"><table class="table" summary="Unary Operators">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
operator
</p>
</th>
<th>
<p>
concept
</p>
</th>
<th>
<p>
notes
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">++</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/incrementable.html" title="Struct template incrementable">incrementable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
There is no separate post-increment
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">--</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/decrementable.html" title="Struct template decrementable">decrementable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
There is no separate post-decrement
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">*</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/dereferenceable.html" title="Struct template dereferenceable">dereferenceable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">R</span><span class="special">,</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">R</span></code> should usually
be a reference
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">~</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/complementable.html" title="Struct template complementable">complementable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">R</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">-</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/negatable.html" title="Struct template negatable">negatable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">R</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><div class="table">
<a name="boost_typeerasure.predef.binary"></a><p class="title"><b>Table 34.3. Binary Operators</b></p>
<div class="table-contents"><table class="table" summary="Binary Operators">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
operator
</p>
</th>
<th>
<p>
concept
</p>
</th>
<th>
<p>
notes
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">+</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/addable.html" title="Struct template addable">addable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">R</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">-</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/subtractable.html" title="Struct template subtractable">subtractable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">R</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">*</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/multipliable.html" title="Struct template multipliable">multipliable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">R</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">/</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/dividable.html" title="Struct template dividable">dividable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">R</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">%</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/modable.html" title="Struct template modable">modable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">R</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">&</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/bitandable.html" title="Struct template bitandable">bitandable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">R</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">|</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/bitorable.html" title="Struct template bitorable">bitorable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">R</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">^</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/bitxorable.html" title="Struct template bitxorable">bitxorable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">R</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special"><<</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/left_shiftable.html" title="Struct template left_shiftable">left_shiftable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">R</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">>></span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/right_shiftable.html" title="Struct template right_shiftable">right_shiftable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">R</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">==</span></code>
and <code class="computeroutput"><span class="special">!=</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/equality_comparable.html" title="Struct template equality_comparable">equality_comparable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="special">!=</span></code> is implemented in
terms of <code class="computeroutput"><span class="special">==</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special"><</span></code>,
<code class="computeroutput"><span class="special">></span></code>, <code class="computeroutput"><span class="special"><=</span></code>, and <code class="computeroutput"><span class="special">>=</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/less_than_comparable.html" title="Struct template less_than_comparable">less_than_comparable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
All are implemented in terms of <code class="computeroutput"><span class="special"><</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">+=</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/add_assignable.html" title="Struct template add_assignable">add_assignable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">-=</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/subtract_assignable.html" title="Struct template subtract_assignable">subtract_assignable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">*=</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/multiply_assignable.html" title="Struct template multiply_assignable">multiply_assignable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">/=</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/divide_assignable.html" title="Struct template divide_assignable">divide_assignable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">%=</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/mod_assignable.html" title="Struct template mod_assignable">mod_assignable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">&=</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/bitand_assignable.html" title="Struct template bitand_assignable">bitand_assignable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">|=</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/bitor_assignable.html" title="Struct template bitor_assignable">bitor_assignable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">^=</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/bitxor_assignable.html" title="Struct template bitxor_assignable">bitxor_assignable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special"><<=</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/left_shift_assignable.html" title="Struct template left_shift_assignable">left_shift_assignable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">>>=</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/right_shift_assignable.html" title="Struct template right_shift_assignable">right_shift_assignable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special"><<</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/ostreamable.html" title="Struct template ostreamable">ostreamable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">Os</span>
<span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream</span><span class="special">,</span> <span class="identifier">T</span> <span class="special">=</span> <span class="identifier">_self</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">>></span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/istreamable.html" title="Struct template istreamable">istreamable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">Is</span>
<span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span><span class="special">,</span> <span class="identifier">T</span> <span class="special">=</span> <span class="identifier">_self</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><div class="table">
<a name="boost_typeerasure.predef.misc"></a><p class="title"><b>Table 34.4. Miscellaneous Operators</b></p>
<div class="table-contents"><table class="table" summary="Miscellaneous Operators">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
operator
</p>
</th>
<th>
<p>
concept
</p>
</th>
<th>
<p>
notes
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/callable.html" title="Struct template callable">callable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">Sig</span><span class="special">,</span> <span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">Sig</span></code> should be a function
type. T may be const qualified.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="keyword">operator</span><span class="special">[]</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/subscriptable.html" title="Struct template subscriptable">subscriptable</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">R</span><span class="special">,</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">N</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ptrdiff_t</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">R</span></code> should usually
be a reference. <code class="computeroutput"><span class="identifier">T</span></code>
can be optionally const qualified.
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><div class="table">
<a name="boost_typeerasure.predef.iterator"></a><p class="title"><b>Table 34.5. Iterator Concepts</b></p>
<div class="table-contents"><table class="table" summary="Iterator Concepts">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
concept
</p>
</th>
<th>
<p>
notes
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/iterator.html" title="Struct template iterator">iterator</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">Traversal</span><span class="special">,</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">Reference</span><span class="special">,</span> <span class="identifier">Difference</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
Use <code class="computeroutput"><a class="link" href="../boost/type_erasure/same_type.html" title="Struct template same_type">same_type</a></code>
to control the iterator's value type.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/forward_iterator.html" title="Struct template forward_iterator">forward_iterator</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Reference</span><span class="special">,</span> <span class="identifier">Difference</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/bidirectional_iterator.html" title="Struct template bidirectional_iterator">bidirectional_iterator</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Reference</span><span class="special">,</span> <span class="identifier">Difference</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/random_access_iterator.html" title="Struct template random_access_iterator">random_access_iterator</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Reference</span><span class="special">,</span> <span class="identifier">Difference</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
-
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><div class="table">
<a name="boost_typeerasure.predef.special0"></a><p class="title"><b>Table 34.6. Special Concepts</b></p>
<div class="table-contents"><table class="table" summary="Special Concepts">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
concept
</p>
</th>
<th>
<p>
notes
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<code class="computeroutput"><a class="link" href="../boost/type_erasure/same_type.html" title="Struct template same_type">same_type</a></code><code class="computeroutput"><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
Indicates that two types are the same.
</p>
</td>
</tr></tbody>
</table></div>
</div>
<br class="table-break">
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2011-2013 Steven Watanabe<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
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