boost_fusion/doc/html/fusion/sequences/views/single_view.html

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>single_view</title>
<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.68.1">
<link rel="start" href="../../../index.html" title="Chapter 1. Fusion 2.0">
<link rel="up" href="../views.html" title="Views">
<link rel="prev" href="../views.html" title="Views">
<link rel="next" href="filter_view.html" title="filter_view">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%">
<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../boost.png"></td>
<td align="center"><a href="../../../../../../../index.htm">Home</a></td>
<td align="center"><a href="../../../../../../libraries.htm">Libraries</a></td>
<td align="center"><a href="../../../../../../../people/people.htm">People</a></td>
<td align="center"><a href="../../../../../../../more/faq.htm">FAQ</a></td>
<td align="center"><a href="../../../../../../../more/index.htm">More</a></td>
</table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="../views.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../views.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="filter_view.html"><img src="../../../images/next.png" alt="Next"></a>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.sequences.views.single_view"></a><a href="single_view.html" title="single_view">single_view</a></h4></div></div></div>
<p>
          <code class="computeroutput"><span class="identifier">single_view</span></code> is a view into
          a value as a single element sequence.
        </p>
<a name="fusion.sequences.views.single_view.header"></a><h5>
<a name="id975173"></a>
          <a href="single_view.html#fusion.sequences.views.single_view.header">Header</a>
        </h5>
<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">sequence</span><span class="special">/</span><span class="identifier">view</span><span class="special">/</span><span class="identifier">single_view</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequences.views.single_view.synopsis"></a><h5>
<a name="id975264"></a>
          <a href="single_view.html#fusion.sequences.views.single_view.synopsis">Synopsis</a>
        </h5>
<pre class="programlisting">
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">single_view</span><span class="special">;</span>
</pre>
<a name="fusion.sequences.views.single_view.template_parameters"></a><h5>
<a name="id975332"></a>
          <a href="single_view.html#fusion.sequences.views.single_view.template_parameters">Template
          parameters</a>
        </h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Description</th>
<th>Default</th>
</tr></thead>
<tbody><tr>
<td><code class="computeroutput"><span class="identifier">T</span></code></td>
<td>Any
                type</td>
<td> </td>
</tr></tbody>
</table></div>
<a name="fusion.sequences.views.single_view.model_of"></a><h5>
<a name="id975401"></a>
          <a href="single_view.html#fusion.sequences.views.single_view.model_of">Model of</a>
        </h5>
<div class="itemizedlist"><ul type="disc"><li><a href="../concepts/forward_sequence.html" title="Forward
        Sequence">Forward Sequence</a></li></ul></div>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><code class="computeroutput"><span class="identifier">S</span></code></span></dt>
<dd>
            A <code class="computeroutput"><span class="identifier">single_view</span></code> type
          </dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">s</span></code>,
          <code class="computeroutput"><span class="identifier">s2</span></code></span></dt>
<dd>
            Instances of <code class="computeroutput"><span class="identifier">single_view</span></code>
</dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">x</span></code></span></dt>
<dd>
            An instance of <code class="computeroutput"><span class="identifier">T</span></code>
</dd>
</dl>
</div>
<a name="fusion.sequences.views.single_view.expression_semantics"></a><h5>
<a name="id975526"></a>
          <a href="single_view.html#fusion.sequences.views.single_view.expression_semantics">Expression
          Semantics</a>
        </h5>
<p>
          Semantics of an expression is defined only where it differs from, or is
          not defined in <a href="../concepts/forward_sequence.html" title="Forward
        Sequence">Forward
          Sequence</a>.
        </p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>Expression</th>
<th>Semantics</th>
</tr></thead>
<tbody>
<tr>
<td><code class="computeroutput"><span class="identifier">S</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code></td>
<td>Creates
                a <code class="computeroutput"><span class="identifier">single_view</span></code> from
                <code class="computeroutput"><span class="identifier">x</span></code>.</td>
</tr>
<tr>
<td><code class="computeroutput"><span class="identifier">S</span><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></code></td>
<td>Copy
                constructs a <code class="computeroutput"><span class="identifier">single_view</span></code>
                from another <code class="computeroutput"><span class="identifier">single_view</span></code>,
                <code class="computeroutput"><span class="identifier">s</span></code>.</td>
</tr>
<tr>
<td><code class="computeroutput"><span class="identifier">s</span> <span class="special">=</span>
                <span class="identifier">s2</span></code></td>
<td>Assigns
                to a <code class="computeroutput"><span class="identifier">single_view</span></code>,
                <code class="computeroutput"><span class="identifier">s</span></code>, from another
                <code class="computeroutput"><span class="identifier">single_view</span></code>, <code class="computeroutput"><span class="identifier">s2</span></code>.</td>
</tr>
</tbody>
</table></div>
<a name="fusion.sequences.views.single_view.example"></a><h5>
<a name="id975752"></a>
          <a href="single_view.html#fusion.sequences.views.single_view.example">Example</a>
        </h5>
<pre class="programlisting">
<span class="identifier">single_view</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">view</span><span class="special">(</span><span class="number">3</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> <span class="identifier">view</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>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><small>Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
      Schwinger</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="../views.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../views.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="filter_view.html"><img src="../../../images/next.png" alt="Next"></a>
</div>
</body>
</html>