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<div class="section" id="map">
<h1><a class="toc-backref" href="./classes.html#id1410">map</a></h1>
<div class="section" id="id80">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p><tt class="literal"><span class="pre"><a href="./map.html" class="identifier">map</a></span></tt> is a <a class="reference internal" href="./variadic-sequence.html">variadic</a>, <a class="reference internal" href="./associative-sequence.html">associative</a>, <a class="reference internal" href="./extensible-associative-sequence.html">extensible</a> sequence of type pairs that
supports constant-time insertion and removal of elements, and testing for membership.
A <tt class="literal"><span class="pre"><a href="./map.html" class="identifier">map</a></span></tt> may contain at most one element for each key.</p>
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<div class="section" id="id83">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
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<tr><th class="head">Sequence form</th>
<th class="head">Header</th>
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<tr><td>Variadic</td>
<td><tt class="literal"><span class="pre">#include &lt;<a href="../../../../boost/mpl/map.hpp" class="header">boost/mpl/map.hpp</a>&gt;</span></tt></td>
</tr>
<tr><td>Numbered</td>
<td><tt class="literal"><span class="pre">#include &lt;boost/mpl/map/map</span></tt><em>n</em><tt class="literal"><span class="pre">.hpp&gt;</span></tt></td>
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<div class="section" id="id84">
<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
<ul class="simple">
<li><a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a></li>
<li><a class="reference internal" href="./associative-sequence.html">Associative Sequence</a></li>
<li><a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a></li>
</ul>
</div>
<div class="section" id="id85">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>In the following table and subsequent specifications, <tt class="literal"><span class="pre">m</span></tt> is an instance of <tt class="literal"><span class="pre"><a href="./map.html" class="identifier">map</a></span></tt>,
<tt class="literal"><span class="pre">pos</span></tt> is an iterator into <tt class="literal"><span class="pre">m</span></tt>, <tt class="literal"><span class="pre">x</span></tt> and <em>p</em><sub>1</sub>,<em>p</em><sub>2</sub>,... <em>p</em><sub>n</sub> are <tt class="literal"><span class="pre"><a href="./pair.html" class="identifier">pair</a></span></tt>s, and <tt class="literal"><span class="pre">k</span></tt> is an arbitrary type.</p>
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<tr><th class="head">Expression</th>
<th class="head">Semantics</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><pre class="first last literal-block">
<a href="./map.html" class="identifier">map</a>&lt;<em>p</em><sub>1</sub>,<em>p</em><sub>2</sub>,... <em>p</em><sub>n</sub>&gt;
<a href="./map.html" class="identifier">map</a><em>n</em>&lt;<em>p</em><sub>1</sub>,<em>p</em><sub>2</sub>,... <em>p</em><sub>n</sub>&gt;
</pre>
</td>
<td><tt class="literal"><span class="pre"><a href="./map.html" class="identifier">map</a></span></tt> of elements <em>p</em><sub>1</sub>,<em>p</em><sub>2</sub>,... <em>p</em><sub>n</sub>; see
<a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a>.</td>
</tr>
<tr><td><pre class="first last literal-block">
<a href="./map.html" class="identifier">map</a>&lt;<em>p</em><sub>1</sub>,<em>p</em><sub>2</sub>,... <em>p</em><sub>n</sub>&gt;::type
<a href="./map.html" class="identifier">map</a><em>n</em>&lt;<em>p</em><sub>1</sub>,<em>p</em><sub>2</sub>,... <em>p</em><sub>n</sub>&gt;::type
</pre>
</td>
<td>Identical to <tt class="literal"><span class="pre"><a href="./map.html" class="identifier">map</a></span></tt><em>n</em><tt class="literal"><span class="pre">&lt;</span></tt><em>p</em><sub>1</sub>,<em>p</em><sub>2</sub>,... <em>p</em><sub>n</sub><tt class="literal"><span class="pre">&gt;</span></tt>;
see <a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;m&gt;::type</span></tt></td>
<td>An iterator pointing to the beginning of <tt class="literal"><span class="pre">m</span></tt>;
see <a class="reference internal" href="./associative-sequence.html">Associative Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;m&gt;::type</span></tt></td>
<td>An iterator pointing to the end of <tt class="literal"><span class="pre">m</span></tt>;
see <a class="reference internal" href="./associative-sequence.html">Associative Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;m&gt;::type</span></tt></td>
<td>The size of <tt class="literal"><span class="pre">m</span></tt>; see <a class="reference internal" href="./associative-sequence.html">Associative Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./empty.html" class="identifier">empty</a>&lt;m&gt;::type</span></tt></td>
<td>A boolean <a class="reference internal" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">c</span></tt> such that
<tt class="literal"><span class="pre">c::value</span> <span class="pre">==</span> <span class="pre">true</span></tt> if and only if <tt class="literal"><span class="pre">m</span></tt> is empty; see
<a class="reference internal" href="./associative-sequence.html">Associative Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./front.html" class="identifier">front</a>&lt;m&gt;::type</span></tt></td>
<td>The first element in <tt class="literal"><span class="pre">m</span></tt>; see
<a class="reference internal" href="./associative-sequence.html">Associative Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./has-key.html" class="identifier">has_key</a>&lt;m,k&gt;::type</span></tt></td>
<td>Queries the presence of elements with the key <tt class="literal"><span class="pre">k</span></tt> in
<tt class="literal"><span class="pre">m</span></tt>; see <a class="reference internal" href="./associative-sequence.html">Associative Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./count.html" class="identifier">count</a>&lt;m,k&gt;::type</span></tt></td>
<td>The number of elements with the key <tt class="literal"><span class="pre">k</span></tt> in <tt class="literal"><span class="pre">m</span></tt>;
see <a class="reference internal" href="./associative-sequence.html">Associative Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./order.html" class="identifier">order</a>&lt;m,k&gt;::type</span></tt></td>
<td>A unique unsigned <a class="reference internal" href="./integral-constant.html">Integral Constant</a> associated with
the key <tt class="literal"><span class="pre">k</span></tt> in <tt class="literal"><span class="pre">m</span></tt>; see <a class="reference internal" href="./associative-sequence.html">Associative Sequence</a>.</td>
</tr>
<tr><td><pre class="first last literal-block">
<a href="./at.html" class="identifier">at</a>&lt;m,k&gt;::type
<a href="./at.html" class="identifier">at</a>&lt;m,k,default&gt;::type
</pre>
</td>
<td>The element associated with the key <tt class="literal"><span class="pre">k</span></tt> in
<tt class="literal"><span class="pre">m</span></tt>; see <a class="reference internal" href="./associative-sequence.html">Associative Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./key-type.html" class="identifier">key_type</a>&lt;m,x&gt;::type</span></tt></td>
<td>Identical to <tt class="literal"><span class="pre">x::first</span></tt>; see <a class="reference internal" href="./associative-sequence.html">Associative Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./value-type.html" class="identifier">value_type</a>&lt;m,x&gt;::type</span></tt></td>
<td>Identical to <tt class="literal"><span class="pre">x::second</span></tt>; see <a class="reference internal" href="./associative-sequence.html">Associative Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a>&lt;m,x&gt;::type</span></tt></td>
<td><p class="first">A new <tt class="literal"><span class="pre"><a href="./map.html" class="identifier">map</a></span></tt>, <tt class="literal"><span class="pre">t</span></tt>, equivalent to <tt class="literal"><span class="pre">m</span></tt> except that</p>
<pre class="literal-block">
<a href="./at.html" class="identifier">at</a>&lt; t, <a href="./key-type.html" class="identifier">key_type</a>&lt;m,x&gt;::type &gt;::type
</pre>
<p class="last">is identical to <tt class="literal"><span class="pre"><a href="./value-type.html" class="identifier">value_type</a>&lt;m,x&gt;::type</span></tt>.</p>
</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a>&lt;m,pos,x&gt;::type</span></tt></td>
<td>Equivalent to <tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a>&lt;m,x&gt;::type</span></tt>; <tt class="literal"><span class="pre">pos</span></tt> is ignored.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./erase-key.html" class="identifier">erase_key</a>&lt;m,k&gt;::type</span></tt></td>
<td>A new <tt class="literal"><span class="pre"><a href="./map.html" class="identifier">map</a></span></tt>, <tt class="literal"><span class="pre">t</span></tt>, equivalent to <tt class="literal"><span class="pre">m</span></tt> except that
<tt class="literal"><span class="pre"><a href="./has-key.html" class="identifier">has_key</a>&lt;t,</span> <span class="pre">k&gt;::value</span> <span class="pre">==</span> <span class="pre">false</span></tt>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a>&lt;m,pos&gt;::type</span></tt></td>
<td>Equivalent to <tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a>&lt;m,</span> <span class="pre"><a href="./deref.html" class="identifier">deref</a>&lt;pos&gt;::type</span> <span class="pre">&gt;::type</span></tt>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./clear.html" class="identifier">clear</a>&lt;m&gt;::type</span></tt></td>
<td>An empty <tt class="literal"><span class="pre"><a href="./map.html" class="identifier">map</a></span></tt>; see <a class="reference internal" href="./clear.html">clear</a>.</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="id86">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
typedef <a href="./map.html" class="identifier">map</a>&lt;
      <a href="./pair.html" class="identifier">pair</a>&lt;int,unsigned&gt;
    , <a href="./pair.html" class="identifier">pair</a>&lt;char,unsigned char&gt;
    , <a href="./pair.html" class="identifier">pair</a>&lt;<a href="./long.html" class="identifier">long_</a>&lt;5&gt;,char[17]&gt;
    , <a href="./pair.html" class="identifier">pair</a>&lt;int[42],bool&gt;
    &gt; m;

<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a>&lt;m&gt;::value, ==, 4 );
<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./empty.html" class="identifier">empty</a>&lt;m&gt; ));

<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; <a href="./at.html" class="identifier">at</a>&lt;m,int&gt;::type, unsigned &gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; <a href="./at.html" class="identifier">at</a>&lt;m,<a href="./long.html" class="identifier">long_</a>&lt;5&gt; &gt;::type, char[17] &gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; <a href="./at.html" class="identifier">at</a>&lt;m,int[42]&gt;::type, bool &gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; <a href="./at.html" class="identifier">at</a>&lt;m,long&gt;::type, <a href="./void.html" class="identifier">void_</a> > ));
</pre>
</div>
<div class="section" id="id87">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a>, <a class="reference internal" href="./associative-sequence.html">Associative Sequence</a>, <a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a>, <a class="reference internal" href="./set.html">set</a>, <a class="reference internal" href="./vector.html">vector</a></p>
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