forked from boostorg/fusion
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274 lines
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<title>set</title>
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<link rel="start" href="../../index.html" title="Chapter 1. Fusion 2.0">
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="fusion.container.set"></a><a href="set.html" title="set">set</a></h3></div></div></div>
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<a name="fusion.container.set.description"></a><h4>
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<a name="id534159"></a>
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<a href="set.html#fusion.container.set.description">Description</a>
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</h4>
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<p>
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set is an <a href="../sequence/concepts/associative_sequence.html" title="Associative
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Sequence">Associative
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Sequence</a> of heteregenous typed data elements. Type identity is used
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to impose an equivalence relation on keys. The element's type is its key.
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A set may contain at most one element for each key. Membership testing and
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element key lookup has constant runtime complexity (see <a href="../notes.html#fusion.notes.overloaded_functions">Overloaded
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Functions</a>).
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</p>
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<a name="fusion.container.set.header"></a><h4>
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<a name="id534214"></a>
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<a href="set.html#fusion.container.set.header">Header</a>
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</h4>
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<pre class="programlisting">
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">container</span><span class="special">/</span><span class="identifier">set</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">set</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">container</span><span class="special">/</span><span class="identifier">set_fwd</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">set_fwd</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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</pre>
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<a name="fusion.container.set.synopsis"></a><h4>
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<a name="id534497"></a>
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<a href="set.html#fusion.container.set.synopsis">Synopsis</a>
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</h4>
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<pre class="programlisting">
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<span class="keyword">template</span> <span class="special"><</span>
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<span class="keyword">typename</span> <span class="identifier">T0</span> <span class="special">=</span> <span class="emphasis"><em>unspecified</em></span>
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<span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T1</span> <span class="special">=</span> <span class="emphasis"><em>unspecified</em></span>
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<span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T2</span> <span class="special">=</span> <span class="emphasis"><em>unspecified</em></span>
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<span class="special">...</span>
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<span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">TN</span> <span class="special">=</span> <span class="emphasis"><em>unspecified</em></span>
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<span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">set</span><span class="special">;</span>
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</pre>
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<p>
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The variadic class interface accepts <tt class="computeroutput"><span class="number">0</span></tt>
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to <tt class="computeroutput"><span class="identifier">FUSION_MAX_SET_SIZE</span></tt> elements,
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where <tt class="computeroutput"><span class="identifier">FUSION_MAX_SET_SIZE</span></tt>
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is a user definable predefined maximum that defaults to <tt class="computeroutput"><span class="number">10</span></tt>.
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Example:
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</p>
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<pre class="programlisting">
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<span class="identifier">set</span><span class="special"><</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span><span class="special">,</span> <span class="keyword">double</span><span class="special">></span>
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</pre>
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<p>
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You may define the preprocessor constant <tt class="computeroutput"><span class="identifier">FUSION_MAX_SET_SIZE</span></tt>
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before including any Fusion header to change the default. Example:
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</p>
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<pre class="programlisting">
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<span class="preprocessor">#define</span> <span class="identifier">FUSION_MAX_SET_SIZE</span> <span class="number">20</span>
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</pre>
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<a name="fusion.container.set.template_parameters"></a><h4>
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<a name="id534829"></a>
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<a href="set.html#fusion.container.set.template_parameters">Template parameters</a>
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</h4>
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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Parameter
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</p>
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</th>
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<th>
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<p>
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Description
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</p>
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</th>
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<th>
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<p>
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Default
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</p>
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</th>
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</tr></thead>
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<tbody><tr>
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<td>
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<p>
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<tt class="computeroutput"><span class="identifier">T0</span></tt>...<tt class="computeroutput"><span class="identifier">TN</span></tt>
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</p>
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</td>
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<td>
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<p>
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Element types
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</p>
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</td>
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<td>
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<p>
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<span class="emphasis"><em>unspecified-type</em></span>
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</p>
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</td>
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</tr></tbody>
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</table></div>
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<a name="fusion.container.set.model_of"></a><h4>
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<a name="id534948"></a>
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<a href="set.html#fusion.container.set.model_of">Model of</a>
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</h4>
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<div class="itemizedlist"><ul type="disc">
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<li><a href="../sequence/concepts/associative_sequence.html" title="Associative
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Sequence">Associative
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Sequence</a></li>
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<li><a href="../sequence/concepts/forward_sequence.html" title="Forward
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Sequence">Forward Sequence</a></li>
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</ul></div>
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<div class="variablelist">
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<p class="title"><b>Notation</b></p>
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<dl>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">S</span></tt></span></dt>
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<dd><p>
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A <tt class="computeroutput"><span class="identifier">set</span></tt> type
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">s</span></tt></span></dt>
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<dd><p>
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An instance of <tt class="computeroutput"><span class="identifier">set</span></tt>
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">e0</span></tt>...<tt class="computeroutput"><span class="identifier">en</span></tt></span></dt>
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<dd><p>
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Heterogeneous values
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">fs</span></tt></span></dt>
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<dd><p>
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A <a href="../sequence/concepts/forward_sequence.html" title="Forward
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Sequence">Forward Sequence</a>
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</p></dd>
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</dl>
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</div>
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<a name="fusion.container.set.expression_semantics"></a><h4>
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<a name="id535143"></a>
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<a href="set.html#fusion.container.set.expression_semantics">Expression Semantics</a>
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</h4>
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<p>
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Semantics of an expression is defined only where it differs from, or is not
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defined in <a href="../sequence/concepts/random_access_sequence.html" title="Random
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Access Sequence">Random
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Access Sequence</a> and <a href="../sequence/concepts/associative_sequence.html" title="Associative
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Sequence">Associative
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Sequence</a>.
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</p>
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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Expression
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</p>
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</th>
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<th>
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<p>
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Semantics
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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<tt class="computeroutput"><span class="identifier">S</span><span class="special">()</span></tt>
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</p>
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</td>
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<td>
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<p>
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Creates a set with default constructed elements.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<tt class="computeroutput"><span class="identifier">S</span><span class="special">(</span><span class="identifier">e0</span><span class="special">,</span> <span class="identifier">e1</span><span class="special">,...</span>
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<span class="identifier">en</span><span class="special">)</span></tt>
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</p>
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</td>
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<td>
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<p>
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Creates a set with elements <tt class="computeroutput"><span class="identifier">e0</span></tt>...<tt class="computeroutput"><span class="identifier">en</span></tt>.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<tt class="computeroutput"><span class="identifier">S</span><span class="special">(</span><span class="identifier">fs</span><span class="special">)</span></tt>
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</p>
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</td>
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<td>
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<p>
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Copy constructs a set from a <a href="../sequence/concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a> <tt class="computeroutput"><span class="identifier">fs</span></tt>.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<tt class="computeroutput"><span class="identifier">s</span> <span class="special">=</span>
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<span class="identifier">fs</span></tt>
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</p>
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</td>
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<td>
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<p>
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Assigns to a set, <tt class="computeroutput"><span class="identifier">s</span></tt>,
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from a <a href="../sequence/concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a> <tt class="computeroutput"><span class="identifier">fs</span></tt>.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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<a name="fusion.container.set.example"></a><h4>
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<a name="id535491"></a>
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<a href="set.html#fusion.container.set.example">Example</a>
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</h4>
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<pre class="programlisting">
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<span class="keyword">typedef</span> <span class="identifier">set</span><span class="special"><</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">float</span><span class="special">></span> <span class="identifier">S</span><span class="special">;</span>
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<span class="identifier">S</span> <span class="identifier">s</span><span class="special">(</span><span class="number">12</span><span class="special">,</span> <span class="number">5.5f</span><span class="special">);</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <a href="../sequence/intrinsic/functions/at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">at_key</span></tt></a><span class="special"><</span><span class="keyword">int</span><span class="special">>(</span><span class="identifier">s</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <a href="../sequence/intrinsic/functions/at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">at_key</span></tt></a><span class="special"><</span><span class="keyword">float</span><span class="special">>(</span><span class="identifier">s</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <a href="../sequence/intrinsic/metafunctions/has_key.html" title="has_key"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">has_key</span></tt></a><span class="special"><</span><span class="identifier">S</span><span class="special">,</span> <span class="keyword">double</span><span class="special">>::</span><span class="identifier">value</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
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</pre>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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Schwinger<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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>)
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</p>
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</div></td>
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