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<link rel="start" href="../../../index.html" title="Chapter 1. Fusion 2.0">
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<a accesskey="p" href="cons.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../containers.html"><img src="../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="set.html"><img src="../../../images/next.png" alt="Next"></a>
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h4 class="title">
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<a name="fusion.sequences.containers.list"></a><a href="list.html" title="list">list</a></h4></div></div></div>
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<a name="fusion.sequences.containers.list.description"></a><h5>
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<a name="id485898"></a>
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<a href="list.html#fusion.sequences.containers.list.description">Description</a>
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</h5>
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<p>
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<tt class="computeroutput"><span class="identifier">list</span></tt> is a <a href="../concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a> of heterogenous typed data built on top of <a href="cons.html" title="cons"><tt class="computeroutput"><span class="identifier">cons</span></tt></a>. It is more efficient than
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<a href="vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>
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when the target sequence is constructed piecemeal (a data at a time). The
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runtime cost of access to each element is peculiarly constant (see <a href="../../notes.html#fusion.notes.recursive_inlined_functions">Recursive Inlined Functions</a>).
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</p>
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<a name="fusion.sequences.containers.list.header"></a><h5>
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<a name="id485990"></a>
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<a href="list.html#fusion.sequences.containers.list.header">Header</a>
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</h5>
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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">sequence</span><span class="special">/</span><span class="identifier">container</span><span class="special">/</span><span class="identifier">list</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">sequence</span><span class="special">/</span><span class="identifier">container</span><span class="special">/</span><span class="identifier">list</span><span class="special">/</span><span class="identifier">list_forward</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.sequences.containers.list.synopsis"></a><h5>
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<a name="id486178"></a>
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<a href="list.html#fusion.sequences.containers.list.synopsis">Synopsis</a>
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</h5>
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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">list</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_LIST_SIZE</span></tt>
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elements, where <tt class="computeroutput"><span class="identifier">FUSION_MAX_LIST_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">list</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_LIST_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_LIST_SIZE</span> <span class="number">20</span>
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</pre>
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<a name="fusion.sequences.containers.list.template_parameters"></a><h5>
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<a name="id486498"></a>
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<a href="list.html#fusion.sequences.containers.list.template_parameters">Template
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parameters</a>
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</h5>
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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>Parameter</th>
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<th>Description</th>
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<th>Default</th>
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</tr></thead>
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<tbody><tr>
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<td>
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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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</td>
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<td>Element types</td>
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<td><span class="emphasis"><em>unspecified-type</em></span></td>
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</tr></tbody>
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</table></div>
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<a name="fusion.sequences.containers.list.model_of"></a><h5>
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<a name="id486588"></a>
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<a href="list.html#fusion.sequences.containers.list.model_of">Model of</a>
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</h5>
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<div class="itemizedlist"><ul type="disc"><li><a href="../concepts/forward_sequence.html" title="Forward
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Sequence">Forward Sequence</a></li></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">L</span></tt></span></dt>
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<dd>
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A <tt class="computeroutput"><span class="identifier">list</span></tt> type
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</dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">l</span></tt></span></dt>
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<dd>
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An instance of <tt class="computeroutput"><span class="identifier">list</span></tt>
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</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>
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Heterogeneous values
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</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>
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A <a href="../concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a>
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</dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">N</span></tt></span></dt>
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<dd>
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An Integral Constant
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</dd>
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</dl>
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</div>
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<a name="fusion.sequences.containers.list.expression_semantics"></a><h5>
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<a name="id486764"></a>
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<a href="list.html#fusion.sequences.containers.list.expression_semantics">Expression
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Semantics</a>
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</h5>
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<p>
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Semantics of an expression is defined only where it differs from, or is
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not defined in <a href="../concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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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>Expression</th>
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<th>Semantics</th>
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</tr></thead>
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<tbody>
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<tr>
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<td><tt class="computeroutput"><span class="identifier">L</span><span class="special">()</span></tt></td>
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<td>Creates
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a list with default constructed elements.</td>
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</tr>
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<tr>
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<td><tt class="computeroutput"><span class="identifier">L</span><span class="special">(</span><span class="identifier">e0</span><span class="special">,</span> <span class="identifier">e1</span><span class="special">,...</span> <span class="identifier">en</span><span class="special">)</span></tt></td>
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<td>Creates
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a list with elements <tt class="computeroutput"><span class="identifier">e0</span></tt>...<tt class="computeroutput"><span class="identifier">en</span></tt>.</td>
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</tr>
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<tr>
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<td><tt class="computeroutput"><span class="identifier">L</span><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt></td>
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<td>Copy
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constructs a list from a <a href="../concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a>, <tt class="computeroutput"><span class="identifier">s</span></tt>.</td>
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</tr>
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<tr>
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<td><tt class="computeroutput"><span class="identifier">l</span> <span class="special">=</span> <span class="identifier">s</span></tt></td>
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<td>Assigns to a list,
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<tt class="computeroutput"><span class="identifier">l</span></tt>, from a <a href="../concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a>, <tt class="computeroutput"><span class="identifier">s</span></tt>.</td>
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</tr>
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<tr>
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<td><tt class="computeroutput"><a href="../intrinsics/functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a><span class="special"><</span><span class="identifier">N</span><span class="special">>(</span><span class="identifier">l</span><span class="special">)</span></tt></td>
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<td>The
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Nth element from the beginning of the sequence; see <a href="../intrinsics/functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a>.</td>
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</tr>
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</tbody>
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</table></div>
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<p class="blurb">
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<span class="inlinemediaobject"><img src="../../../images/note.png" alt="note"></span> <tt class="computeroutput"><a href="../intrinsics/functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a><span class="special"><</span><span class="identifier">n</span><span class="special">>(</span><span class="identifier">l</span><span class="special">)</span></tt> is
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provided for convenience and compatibility with the original <a href="http://www.boost.org/libs/tuple/doc/tuple_users_guide.html" target="_top">Boost.Tuple</a>
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library, despite <tt class="computeroutput"><span class="identifier">list</span></tt> being
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a <a href="../concepts/forward_sequence.html" title="Forward
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Sequence">Forward Sequence</a>
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only (<a href="../intrinsics/functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a> is supposed to be a <a href="../concepts/random_access_sequence.html" title="Random
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Access Sequence">Random
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Access Sequence</a> requirement). The runtime complexity of <a href="../intrinsics/functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a> is constant (see <a href="../../notes.html#fusion.notes.recursive_inlined_functions">Recursive
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Inlined Functions</a>).
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</p>
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<a name="fusion.sequences.containers.list.example"></a><h5>
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<a name="id487262"></a>
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<a href="list.html#fusion.sequences.containers.list.example">Example</a>
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</h5>
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<pre class="programlisting">
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<span class="identifier">list</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">l</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="../intrinsics/functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a><span class="special"><</span><span class="number">0</span><span class="special">>(</span><span class="identifier">l</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="../intrinsics/functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a><span class="special"><</span><span class="number">1</span><span class="special">>(</span><span class="identifier">l</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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</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"><small>Copyright © 2001-2005 Joel de Guzman, Dan Marsden</small></td>
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</tr></table>
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