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7 <title>The MPL Reference Manual: single_view
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12 <td class=
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<a href=
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14 <div class=
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"single-view">
15 <h1><a class=
"toc-backref" href=
"./views.html#id1421">single_view
</a></h1>
16 <div class=
"section" id=
"id151">
17 <h3><a class=
"subsection-title" href=
"#synopsis" name=
"synopsis">Synopsis
</a></h3>
18 <pre class=
"literal-block">
22 struct
<a href=
"./single-view.html" class=
"identifier">single_view
</a>
24 //
<em>unspecified
</em>
29 <div class=
"section" id=
"id152">
30 <h3><a class=
"subsection-title" href=
"#description" name=
"description">Description
</a></h3>
31 <p>A view onto an arbitrary type
<tt class=
"literal"><span class=
"pre">T
</span></tt> as on a single-element sequence.
</p>
33 <div class=
"section" id=
"id153">
34 <h3><a class=
"subsection-title" href=
"#header" name=
"header">Header
</a></h3>
35 <pre class=
"literal-block">
36 #include
<<a href=
"../../../../boost/mpl/single_view.hpp" class=
"header">boost/mpl/single_view.hpp
</a>>
39 <div class=
"section" id=
"id154">
40 <h3><a class=
"subsection-title" href=
"#model-of" name=
"model-of">Model of
</a></h3>
42 <li><a class=
"reference internal" href=
"./random-access-sequence.html">Random Access Sequence
</a></li>
45 <div class=
"section" id=
"id155">
46 <h3><a class=
"subsection-title" href=
"#parameters" name=
"parameters">Parameters
</a></h3>
47 <table border=
"1" class=
"docutils table">
53 <thead valign=
"bottom">
54 <tr><th class=
"head">Parameter
</th>
55 <th class=
"head">Requirement
</th>
56 <th class=
"head">Description
</th>
60 <tr><td><tt class=
"literal"><span class=
"pre">T
</span></tt></td>
62 <td>The type to be wrapped in a sequence.
</td>
67 <div class=
"section" id=
"id156">
68 <h3><a class=
"subsection-title" href=
"#expression-semantics" name=
"expression-semantics">Expression semantics
</a></h3>
69 <p>The semantics of an expression are defined only
70 where they differ from, or are not defined in
<a class=
"reference internal" href=
"./random-access-sequence.html">Random Access Sequence
</a>.
</p>
71 <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>
72 <table border=
"1" class=
"docutils table">
77 <thead valign=
"bottom">
78 <tr><th class=
"head">Expression
</th>
79 <th class=
"head">Semantics
</th>
83 <tr><td><pre class=
"first last literal-block">
84 <a href=
"./single-view.html" class=
"identifier">single_view
</a><x
>
85 <a href=
"./single-view.html" class=
"identifier">single_view
</a><x
>::type
88 <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
89 <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>
91 <tr><td><tt class=
"literal"><span class=
"pre"><a href=
"./size.html" class=
"identifier">size
</a><v
>::type
</span></tt></td>
92 <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>;
93 see
<a class=
"reference internal" href=
"./random-access-sequence.html">Random Access Sequence
</a>.
</td>
98 <div class=
"section" id=
"id157">
99 <h3><a class=
"subsection-title" href=
"#example" name=
"example">Example
</a></h3>
100 <pre class=
"literal-block">
101 typedef
<a href=
"./single-view.html" class=
"identifier">single_view
</a><int
> view;
102 typedef
<a href=
"./begin.html" class=
"identifier">begin
</a><view
>::type first;
103 typedef
<a href=
"./end.html" class=
"identifier">end
</a><view
>::type last;
105 <a href=
"./assert.html" class=
"identifier">BOOST_MPL_ASSERT
</a>(( is_same
< <a href=
"./deref.html" class=
"identifier">deref
</a><first
>::type,int
> ));
106 <a href=
"./assert.html" class=
"identifier">BOOST_MPL_ASSERT
</a>(( is_same
< <a href=
"./next.html" class=
"identifier">next
</a><first
>::type,last
> ));
107 <a href=
"./assert.html" class=
"identifier">BOOST_MPL_ASSERT
</a>(( is_same
< <a href=
"./prior.html" class=
"identifier">prior
</a><last
>::type,first
> ));
109 <a href=
"./assert-relation.html" class=
"identifier">BOOST_MPL_ASSERT_RELATION
</a>(
<a href=
"./size.html" class=
"identifier">size
</a><view
>::value, ==,
1 );
112 <div class=
"section" id=
"id158">
113 <h3><a class=
"subsection-title" href=
"#see-also" name=
"see-also">See also
</a></h3>
114 <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>
115 <!-- Sequences/Views//transform_view -->
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121 <td><div class=
"copyright-footer"><div class=
"copyright">Copyright ©
2001-
2009 Aleksey Gurtovoy and David Abrahams
</div>
122 Distributed under the Boost Software License, Version
1.0. (See accompanying
123 file LICENSE_1_0.txt or copy at
<a class=
"reference external" href=
"http://www.boost.org/LICENSE_1_0.txt" target=
"_top">http://www.boost.org/LICENSE_1_0.txt
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