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- <title>The MPL Reference Manual: single_view</title>
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- <table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./joint-view.html" class="navigation-link">Prev</a> <a href="./transform-view.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./joint-view.html" class="navigation-link">Back</a> <a href="./transform-view.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./views.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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- <div class="section" id="single-view">
- <h1><a class="toc-backref" href="./views.html#id1421">single_view</a></h1>
- <div class="section" id="id151">
- <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
- <pre class="literal-block">
- template<
- typename T
- >
- struct <a href="./single-view.html" class="identifier">single_view</a>
- {
- // <em>unspecified</em>
- // <em>...</em>
- };
- </pre>
- </div>
- <div class="section" id="id152">
- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <p>A view onto an arbitrary type <tt class="literal"><span class="pre">T</span></tt> as on a single-element sequence.</p>
- </div>
- <div class="section" id="id153">
- <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
- <pre class="literal-block">
- #include <<a href="../../../../boost/mpl/single_view.hpp" class="header">boost/mpl/single_view.hpp</a>>
- </pre>
- </div>
- <div class="section" id="id154">
- <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
- <ul class="simple">
- <li><a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a></li>
- </ul>
- </div>
- <div class="section" id="id155">
- <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
- <table border="1" class="docutils table">
- <colgroup>
- <col width="19%" />
- <col width="23%" />
- <col width="58%" />
- </colgroup>
- <thead valign="bottom">
- <tr><th class="head">Parameter</th>
- <th class="head">Requirement</th>
- <th class="head">Description</th>
- </tr>
- </thead>
- <tbody valign="top">
- <tr><td><tt class="literal"><span class="pre">T</span></tt></td>
- <td>Any type</td>
- <td>The type to be wrapped in a sequence.</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id156">
- <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
- <p>The semantics of an expression are defined only
- where they differ from, or are not defined in <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>.</p>
- <p>In the following table, <tt class="literal"><span class="pre">v</span></tt> is an instance of <tt class="literal"><span class="pre"><a href="./single-view.html" class="identifier">single_view</a></span></tt>, <tt class="literal"><span class="pre">x</span></tt> is an arbitrary type.</p>
- <table border="1" class="docutils table">
- <colgroup>
- <col width="34%" />
- <col width="66%" />
- </colgroup>
- <thead valign="bottom">
- <tr><th class="head">Expression</th>
- <th class="head">Semantics</th>
- </tr>
- </thead>
- <tbody valign="top">
- <tr><td><pre class="first last literal-block">
- <a href="./single-view.html" class="identifier">single_view</a><x>
- <a href="./single-view.html" class="identifier">single_view</a><x>::type
- </pre>
- </td>
- <td>A single-element <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a> <tt class="literal"><span class="pre">v</span></tt> such that
- <tt class="literal"><span class="pre"><a href="./front.html" class="identifier">front</a><v>::type</span></tt> is identical to <tt class="literal"><span class="pre">x</span></tt>.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><v>::type</span></tt></td>
- <td>The size of <tt class="literal"><span class="pre">v</span></tt>; <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><v>::value</span> <span class="pre">==</span> <span class="pre">1</span></tt>;
- see <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>.</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id157">
- <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
- <pre class="literal-block">
- typedef <a href="./single-view.html" class="identifier">single_view</a><int> view;
- typedef <a href="./begin.html" class="identifier">begin</a><view>::type first;
- typedef <a href="./end.html" class="identifier">end</a><view>::type last;
- <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./deref.html" class="identifier">deref</a><first>::type,int > ));
- <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./next.html" class="identifier">next</a><first>::type,last > ));
- <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./prior.html" class="identifier">prior</a><last>::type,first > ));
- <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><view>::value, ==, 1 );
- </pre>
- </div>
- <div class="section" id="id158">
- <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
- <p><a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./views.html">Views</a>, <a class="reference internal" href="./iterator-range.html">iterator_range</a>, <a class="reference internal" href="./filter-view.html">filter_view</a>, <a class="reference internal" href="./transform-view.html">transform_view</a>, <a class="reference internal" href="./joint-view.html">joint_view</a>, <a class="reference internal" href="./zip-view.html">zip_view</a></p>
- <!-- Sequences/Views//transform_view -->
- </div>
- </div>
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- <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div>
- Distributed under the Boost Software License, Version 1.0. (See accompanying
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