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<div class="section" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="fusion.container.vector"></a><a href="vector.html" title="vector">vector</a></h3></div></div></div>
<a name="fusion.container.vector.description"></a><h4>
<a name="id527629"></a>
<a href="vector.html#fusion.container.vector.description">Description</a>
</h4>
<p>
<tt class="computeroutput"><span class="identifier">vector</span></tt> is a <a href="../sequence/concepts/random_access_sequence.html" title="Random
Access Sequence">Random
Access Sequence</a> of heterogenous typed data structured as a simple
<tt class="computeroutput"><span class="keyword">struct</span></tt> where each element is
held as a member variable. <tt class="computeroutput"><span class="identifier">vector</span></tt>
is the simplest of the Fusion sequence container, and in many cases the most
efficient.
</p>
<a name="fusion.container.vector.header"></a><h4>
<a name="id527707"></a>
<a href="vector.html#fusion.container.vector.header">Header</a>
</h4>
<pre class="programlisting">
<span class="preprocessor">#include</span> <span class="special">&lt;</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">vector</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</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">vector</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</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">vector</span><span class="special">/</span><span class="identifier">vector_fwd</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</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">vector_fwd</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="comment">// numbered forms
</span><span class="preprocessor">#include</span> <span class="special">&lt;</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">vector</span><span class="special">/</span><span class="identifier">vector10</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</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">vector10</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</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">vector</span><span class="special">/</span><span class="identifier">vector20</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</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">vector20</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</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">vector</span><span class="special">/</span><span class="identifier">vector30</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</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">vector30</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</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">vector</span><span class="special">/</span><span class="identifier">vector40</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</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">vector40</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</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">vector</span><span class="special">/</span><span class="identifier">vector50</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</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">vector50</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.container.vector.synopsis"></a><h4>
<a name="id528685"></a>
<a href="vector.html#fusion.container.vector.synopsis">Synopsis</a>
</h4>
<p>
<span class="bold"><b>Numbered forms</b></span>
</p>
<pre class="programlisting">
<span class="keyword">template</span> <span class="special">&lt;&gt;</span>
<span class="keyword">struct</span> <span class="identifier">vector0</span><span class="special">;</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T0</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">vector1</span><span class="special">;</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T0</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T1</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">vector2</span><span class="special">;</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T0</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T2</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">vector3</span><span class="special">;</span>
<span class="special">...</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T0</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T2</span><span class="special">...,</span> <span class="keyword">typename</span> <span class="identifier">TN</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">vectorN</span><span class="special">;</span>
</pre>
<p>
<span class="bold"><b>Variadic form</b></span>
</p>
<pre class="programlisting">
<span class="keyword">template</span> <span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">T0</span> <span class="special">=</span> <span class="emphasis"><em>unspecified</em></span>
<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>
<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>
<span class="special">...</span>
<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>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">vector</span><span class="special">;</span>
</pre>
<p>
The numbered form accepts the exact number of elements. Example:
</p>
<pre class="programlisting">
<span class="identifier">vector3</span><span class="special">&lt;</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">&gt;</span>
</pre>
<p>
The variadic form accepts <tt class="computeroutput"><span class="number">0</span></tt> to
<tt class="computeroutput"><span class="identifier">FUSION_MAX_VECTOR_SIZE</span></tt> elements,
where <tt class="computeroutput"><span class="identifier">FUSION_MAX_VECTOR_SIZE</span></tt>
is a user definable predefined maximum that defaults to <tt class="computeroutput"><span class="number">10</span></tt>.
Example:
</p>
<pre class="programlisting">
<span class="identifier">vector</span><span class="special">&lt;</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">&gt;</span>
</pre>
<p>
You may define the preprocessor constant <tt class="computeroutput"><span class="identifier">FUSION_MAX_VECTOR_SIZE</span></tt>
before including any Fusion header to change the default. Example:
</p>
<pre class="programlisting">
<span class="preprocessor">#define</span> <span class="identifier">FUSION_MAX_VECTOR_SIZE</span> <span class="number">20</span>
</pre>
<a name="fusion.container.vector.template_parameters"></a><h4>
<a name="id529428"></a>
<a href="vector.html#fusion.container.vector.template_parameters">Template parameters</a>
</h4>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Description
</p>
</th>
<th>
<p>
Default
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">T0</span></tt>...<tt class="computeroutput"><span class="identifier">TN</span></tt>
</p>
</td>
<td>
<p>
Element types
</p>
</td>
<td>
<p>
<span class="emphasis"><em>unspecified</em></span>
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.container.vector.model_of"></a><h4>
<a name="id529547"></a>
<a href="vector.html#fusion.container.vector.model_of">Model of</a>
</h4>
<div class="itemizedlist"><ul type="disc"><li><a href="../sequence/concepts/random_access_sequence.html" title="Random
Access Sequence">Random
Access Sequence</a></li></ul></div>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">v</span></tt></span></dt>
<dd><p>
Instance of <tt class="computeroutput"><span class="identifier">vector</span></tt>
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">V</span></tt></span></dt>
<dd><p>
A <tt class="computeroutput"><span class="identifier">vector</span></tt> type
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">e0</span></tt>...<tt class="computeroutput"><span class="identifier">en</span></tt></span></dt>
<dd><p>
Heterogeneous values
</p></dd>
<dt><span class="term"><tt class="computeroutput"><span class="identifier">s</span></tt></span></dt>
<dd><p>
A <a href="../sequence/concepts/forward_sequence.html" title="Forward
Sequence">Forward Sequence</a>
</p></dd>
</dl>
</div>
<a name="fusion.container.vector.expression_semantics"></a><h4>
<a name="id529732"></a>
<a href="vector.html#fusion.container.vector.expression_semantics">Expression Semantics</a>
</h4>
<p>
Semantics of an expression is defined only where it differs from, or is not
defined in <a href="../sequence/concepts/random_access_sequence.html" title="Random
Access Sequence">Random
Access Sequence</a>.
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Semantics
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">V</span><span class="special">()</span></tt>
</p>
</td>
<td>
<p>
Creates a vector with default constructed elements.
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">V</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>
</p>
</td>
<td>
<p>
Creates a vector with elements <tt class="computeroutput"><span class="identifier">e0</span></tt>...<tt class="computeroutput"><span class="identifier">en</span></tt>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">V</span><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></tt>
</p>
</td>
<td>
<p>
Copy constructs a vector from a <a href="../sequence/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>, <tt class="computeroutput"><span class="identifier">s</span></tt>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">v</span> <span class="special">=</span>
<span class="identifier">s</span></tt>
</p>
</td>
<td>
<p>
Assigns to a vector, <tt class="computeroutput"><span class="identifier">v</span></tt>,
from a <a href="../sequence/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>, <tt class="computeroutput"><span class="identifier">s</span></tt>.
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.container.vector.example"></a><h4>
<a name="id530070"></a>
<a href="vector.html#fusion.container.vector.example">Example</a>
</h4>
<pre class="programlisting">
<span class="identifier">vector</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">float</span><span class="special">&gt;</span> <span class="identifier">v</span><span class="special">(</span><span class="number">12</span><span class="special">,</span> <span class="number">5.5f</span><span class="special">);</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <a href="../sequence/intrinsic/functions/at_c.html" title="at_c"><tt class="computeroutput"><span class="identifier">at_c</span></tt></a><span class="special">&lt;</span><span class="number">0</span><span class="special">&gt;(</span><span class="identifier">v</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <a href="../sequence/intrinsic/functions/at_c.html" title="at_c"><tt class="computeroutput"><span class="identifier">at_c</span></tt></a><span class="special">&lt;</span><span class="number">1</span><span class="special">&gt;(</span><span class="identifier">v</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
</pre>
</div>
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<td align="right"><div class="copyright-footer">Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<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>
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