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<!-- Copyright Aleksey Gurtovoy 2006. Distributed under the Boost -->
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<meta name="generator" content="Docutils 0.3.6: http://docutils.sourceforge.net/" />
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<title>The MPL Reference Manual: set</title>
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<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./deque.html" class="navigation-link">Prev</a> <a href="./map.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./deque.html" class="navigation-link">Back</a> <a href="./map.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./classes.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
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<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./sequences.html" class="navigation-link">Sequences</a> / <a href="./classes.html" class="navigation-link">Classes</a> / <a href="./set.html" class="navigation-link">set</a></td>
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</tr></table><div class="header-separator"></div>
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<div class="section" id="set">
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<h1><a class="toc-backref" href="./classes.html#id338" name="set">set</a></h1>
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<div class="section" id="set-description">
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<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
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<p><tt class="literal"><span class="pre"><a href="./set.html" class="identifier">set</a></span></tt> is a <a class="reference" href="./variadic-sequence.html">variadic</a>, <a class="reference" href="./associative-sequence.html">associative</a>, <a class="reference" href="./extensible-associative.html">extensible</a> sequence of types that
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supports constant-time insertion and removal of elements, and testing for membership.
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A <tt class="literal"><span class="pre"><a href="./set.html" class="identifier">set</a></span></tt> may contain at most one element for each key.</p>
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</div>
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<div class="section" id="set-header">
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<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
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<table border="1" class="table">
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<colgroup>
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<col width="26%" />
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<col width="74%" />
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</colgroup>
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<thead valign="bottom">
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<tr><th>Sequence form</th>
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<th>Header</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr><td>Variadic</td>
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<td><tt class="literal"><span class="pre">#include <<a href="../../../../boost/mpl/set.hpp" class="header">boost/mpl/set.hpp</a>></span></tt></td>
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</tr>
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<tr><td>Numbered</td>
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<td><tt class="literal"><span class="pre">#include <boost/mpl/set/set</span></tt><em>n</em><tt class="literal"><span class="pre">.hpp></span></tt></td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="set-model-of">
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<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
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<ul class="simple">
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<li><a class="reference" href="./variadic-sequence.html">Variadic Sequence</a></li>
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<li><a class="reference" href="./associative-sequence.html">Associative Sequence</a></li>
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<li><a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a></li>
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</ul>
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</div>
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<div class="section" id="set-expression-semantics">
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<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
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<p>In the following table, <tt class="literal"><span class="pre">s</span></tt> is an instance of <tt class="literal"><span class="pre"><a href="./set.html" class="identifier">set</a></span></tt>, <tt class="literal"><span class="pre">pos</span></tt> is an iterator into <tt class="literal"><span class="pre">s</span></tt>,
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and <tt class="literal"><span class="pre">x</span></tt>, <tt class="literal"><span class="pre">k</span></tt>, and <em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub> are arbitrary types.</p>
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<table border="1" class="table">
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<colgroup>
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<col width="40%" />
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<col width="60%" />
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</colgroup>
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<thead valign="bottom">
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<tr><th>Expression</th>
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<th>Semantics</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr><td><pre class="first last literal-block">
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<a href="./set.html" class="identifier">set</a><<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>>
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<a href="./set.html" class="identifier">set</a><em>n</em><<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>>
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</pre>
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</td>
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<td><tt class="literal"><span class="pre"><a href="./set.html" class="identifier">set</a></span></tt> of elements <em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>; see
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<a class="reference" href="./variadic-sequence.html">Variadic Sequence</a>.</td>
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</tr>
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<tr><td><pre class="first last literal-block">
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<a href="./set.html" class="identifier">set</a><<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>>::type
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<a href="./set.html" class="identifier">set</a><em>n</em><<em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>>::type
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</pre>
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</td>
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<td>Identical to <tt class="literal"><span class="pre"><a href="./set.html" class="identifier">set</a></span></tt><em>n</em><tt class="literal"><span class="pre"><</span></tt><em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub><tt class="literal"><span class="pre">></span></tt>;
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see <a class="reference" href="./variadic-sequence.html">Variadic Sequence</a>.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><s>::type</span></tt></td>
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<td>An iterator pointing to the beginning of <tt class="literal"><span class="pre">s</span></tt>;
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see <a class="reference" href="./associative-sequence.html">Associative Sequence</a>.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><s>::type</span></tt></td>
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<td>An iterator pointing to the end of <tt class="literal"><span class="pre">s</span></tt>;
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see <a class="reference" href="./associative-sequence.html">Associative Sequence</a>.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::type</span></tt></td>
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<td>The size of <tt class="literal"><span class="pre">s</span></tt>; see <a class="reference" href="./associative-sequence.html">Associative Sequence</a>.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./empty.html" class="identifier">empty</a><s>::type</span></tt></td>
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<td>A boolean <a class="reference" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">c</span></tt> such that
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<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">s</span></tt> is empty; see
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<a class="reference" href="./associative-sequence.html">Associative Sequence</a>.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./front.html" class="identifier">front</a><s>::type</span></tt></td>
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<td>The first element in <tt class="literal"><span class="pre">s</span></tt>; see
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<a class="reference" href="./associative-sequence.html">Associative Sequence</a>.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./has-key.html" class="identifier">has_key</a><s,k>::type</span></tt></td>
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<td>A boolean <a class="reference" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">c</span></tt> such that
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<tt class="literal"><span class="pre">c::value</span> <span class="pre">==</span> <span class="pre">true</span></tt> if and only if there is one or more elements
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with the key <tt class="literal"><span class="pre">k</span></tt> in <tt class="literal"><span class="pre">s</span></tt>; see <a class="reference" href="./associative-sequence.html">Associative Sequence</a>.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./count.html" class="identifier">count</a><s,k>::type</span></tt></td>
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<td>The number of elements with the key <tt class="literal"><span class="pre">k</span></tt> in <tt class="literal"><span class="pre">s</span></tt>;
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see <a class="reference" href="./associative-sequence.html">Associative Sequence</a>.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./order.html" class="identifier">order</a><s,k>::type</span></tt></td>
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<td>A unique unsigned <a class="reference" href="./integral-constant.html">Integral Constant</a> associated with
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the key <tt class="literal"><span class="pre">k</span></tt> in <tt class="literal"><span class="pre">s</span></tt>; see <a class="reference" href="./associative-sequence.html">Associative Sequence</a>.</td>
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</tr>
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<tr><td><pre class="first last literal-block">
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<a href="./at.html" class="identifier">at</a><s,k>::type
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<a href="./at.html" class="identifier">at</a><s,k,def>::type
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</pre>
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</td>
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<td>The element associated with the key <tt class="literal"><span class="pre">k</span></tt> in
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<tt class="literal"><span class="pre">s</span></tt>; see <a class="reference" href="./associative-sequence.html">Associative Sequence</a>.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./key-type.html" class="identifier">key_type</a><s,x>::type</span></tt></td>
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<td>Identical to <tt class="literal"><span class="pre">x</span></tt>; see <a class="reference" href="./associative-sequence.html">Associative Sequence</a>.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./value-type.html" class="identifier">value_type</a><s,x>::type</span></tt></td>
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<td>Identical to <tt class="literal"><span class="pre">x</span></tt>; see <a class="reference" href="./associative-sequence.html">Associative Sequence</a>.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a><s,x>::type</span></tt></td>
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<td><p class="first">A new <tt class="literal"><span class="pre"><a href="./set.html" class="identifier">set</a></span></tt> equivalent to <tt class="literal"><span class="pre">s</span></tt> except that</p>
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<pre class="literal-block">
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<a href="./at.html" class="identifier">at</a>< t, <a href="./key-type.html" class="identifier">key_type</a><s,x>::type >::type
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</pre>
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<p class="last">is identical to <tt class="literal"><span class="pre"><a href="./value-type.html" class="identifier">value_type</a><s,x>::type</span></tt>.</p>
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</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a><s,pos,x>::type</span></tt></td>
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<td>Equivalent to <tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a><s,x>::type</span></tt>; <tt class="literal"><span class="pre">pos</span></tt> is ignored.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./erase-key.html" class="identifier">erase_key</a><s,k>::type</span></tt></td>
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<td>A new <tt class="literal"><span class="pre"><a href="./set.html" class="identifier">set</a></span></tt> equivalent to <tt class="literal"><span class="pre">s</span></tt> except that
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<tt class="literal"><span class="pre"><a href="./has-key.html" class="identifier">has_key</a><t,</span> <span class="pre">k>::value</span> <span class="pre">==</span> <span class="pre">false</span></tt>.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a><s,pos>::type</span></tt></td>
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<td>Equivalent to <tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a><s,</span> <span class="pre"><a href="./deref.html" class="identifier">deref</a><pos>::type</span> <span class="pre">>::type</span></tt>.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./clear.html" class="identifier">clear</a><s>::type</span></tt></td>
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<td>An empty <tt class="literal"><span class="pre"><a href="./set.html" class="identifier">set</a></span></tt>; see <a class="refentry reference" href="./clear.html"><tt class="refentry literal"><span class="pre">clear</span></tt></a>.</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="set-example">
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<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
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<pre class="literal-block">
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typedef <a href="./set.html" class="identifier">set</a>< int,long,double,<a href="./int.html" class="identifier">int_</a><5> > s;
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<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><s>::value, ==, 4 );
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<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./empty.html" class="identifier">empty</a><s> ));
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<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./at.html" class="identifier">at</a><s,int>::type, int > ));
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<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./at.html" class="identifier">at</a><s,long>::type, long > ));
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<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./at.html" class="identifier">at</a><s,<a href="./int.html" class="identifier">int_</a><5> >::type, <a href="./int.html" class="identifier">int_</a><5> > ));
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<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./at.html" class="identifier">at</a><s,char>::type, <a href="./void.html" class="identifier">void_</a> > ));
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</pre>
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</div>
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<div class="section" id="set-see-also">
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<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
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<p><a class="reference" href="./sequences.html">Sequences</a>, <a class="reference" href="./variadic-sequence.html">Variadic Sequence</a>, <a class="reference" href="./associative-sequence.html">Associative Sequence</a>, <a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a>, <a class="refentry reference" href="./set-c.html"><tt class="refentry literal"><span class="pre">set_c</span></tt></a>, <a class="refentry reference" href="./map.html"><tt class="refentry literal"><span class="pre">map</span></tt></a>, <a class="refentry reference" href="./vector.html"><tt class="refentry literal"><span class="pre">vector</span></tt></a></p>
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