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2 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> | |
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7 | <title>The MPL Reference Manual: empty_sequence</title> | |
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12 | <td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./sequences.html" class="navigation-link">Sequences</a> / <a href="./views.html" class="navigation-link">Views</a> / <a href="./empty-sequence.html" class="navigation-link">empty_sequence</a></td> | |
13 | </tr></table><div class="header-separator"></div> | |
14 | <div class="section" id="empty-sequence"> | |
15 | <h1><a class="toc-backref" href="./views.html#id1417">empty_sequence</a></h1> | |
16 | <div class="section" id="id120"> | |
17 | <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> | |
18 | <pre class="literal-block"> | |
19 | struct <a href="./empty-sequence.html" class="identifier">empty_sequence</a> | |
20 | { | |
21 | // <em>unspecified</em> | |
22 | // <em>...</em> | |
23 | }; | |
24 | </pre> | |
25 | </div> | |
26 | <div class="section" id="id121"> | |
27 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
28 | <p>Represents a sequence containing no elements.</p> | |
29 | </div> | |
30 | <div class="section" id="id122"> | |
31 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> | |
32 | <pre class="literal-block"> | |
33 | #include <<a href="../../../../boost/mpl/empty_sequence.hpp" class="header">boost/mpl/empty_sequence.hpp</a>> | |
34 | </pre> | |
35 | </div> | |
36 | <div class="section" id="id123"> | |
37 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
38 | <p>The semantics of an expression are defined only | |
39 | where they differ from, or are not defined in <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>.</p> | |
40 | <p>In the following table, <tt class="literal"><span class="pre">s</span></tt> is an instance of <tt class="literal"><span class="pre"><a href="./empty-sequence.html" class="identifier">empty_sequence</a></span></tt>.</p> | |
41 | <table border="1" class="docutils table"> | |
42 | <colgroup> | |
43 | <col width="34%" /> | |
44 | <col width="66%" /> | |
45 | </colgroup> | |
46 | <thead valign="bottom"> | |
47 | <tr><th class="head">Expression</th> | |
48 | <th class="head">Semantics</th> | |
49 | </tr> | |
50 | </thead> | |
51 | <tbody valign="top"> | |
52 | <tr><td><tt class="literal"><span class="pre"><a href="./empty-sequence.html" class="identifier">empty_sequence</a></span></tt></td> | |
53 | <td>An empty <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>.</td> | |
54 | </tr> | |
55 | <tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::type</span></tt></td> | |
56 | <td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span> <span class="pre">==</span> <span class="pre">0</span></tt>; see <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>.</td> | |
57 | </tr> | |
58 | </tbody> | |
59 | </table> | |
60 | </div> | |
61 | <div class="section" id="id124"> | |
62 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> | |
63 | <pre class="literal-block"> | |
64 | typedef <a href="./begin.html" class="identifier">begin</a><<a href="./empty-sequence.html" class="identifier">empty_sequence</a>>::type first; | |
65 | typedef <a href="./end.html" class="identifier">end</a><<a href="./empty-sequence.html" class="identifier">empty_sequence</a>>::type last; | |
66 | ||
67 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same<first,last> )); | |
68 | <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><<a href="./empty-sequence.html" class="identifier">empty_sequence</a>>::value, ==, 0 ); | |
69 | ||
70 | typedef <a href="./transform-view.html" class="identifier">transform_view</a>< | |
71 | <a href="./empty-sequence.html" class="identifier">empty_sequence</a> | |
72 | , add_pointer<_> | |
73 | > empty_view; | |
74 | ||
75 | <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><<a href="./empty-sequence.html" class="identifier">empty_sequence</a>>::value, ==, 0 ); | |
76 | </pre> | |
77 | </div> | |
78 | <div class="section" id="id125"> | |
79 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
80 | <p><a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./views.html">Views</a>, <a class="reference internal" href="./vector.html">vector</a>, <a class="reference internal" href="./list.html">list</a>, <a class="reference internal" href="./single-view.html">single_view</a></p> | |
81 | <!-- Sequences/Views//filter_view --> | |
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87 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
88 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
89 | 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</a>)</div></td></tr></table></body> | |
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