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| <div class="section" id="empty-sequence"> |
| <h1><a class="toc-backref" href="./views.html#id1417">empty_sequence</a></h1> |
| <div class="section" id="id120"> |
| <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> |
| <pre class="literal-block"> |
| struct <a href="./empty-sequence.html" class="identifier">empty_sequence</a> |
| { |
| // <em>unspecified</em> |
| // <em>...</em> |
| }; |
| </pre> |
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| <div class="section" id="id121"> |
| <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> |
| <p>Represents a sequence containing no elements.</p> |
| </div> |
| <div class="section" id="id122"> |
| <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> |
| <pre class="literal-block"> |
| #include <<a href="../../../../boost/mpl/empty_sequence.hpp" class="header">boost/mpl/empty_sequence.hpp</a>> |
| </pre> |
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| <div class="section" id="id123"> |
| <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">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> |
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| <tr><th class="head">Expression</th> |
| <th class="head">Semantics</th> |
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| <tr><td><tt class="literal"><span class="pre"><a href="./empty-sequence.html" class="identifier">empty_sequence</a></span></tt></td> |
| <td>An empty <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::type</span></tt></td> |
| <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> |
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| <div class="section" id="id124"> |
| <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> |
| <pre class="literal-block"> |
| typedef <a href="./begin.html" class="identifier">begin</a><<a href="./empty-sequence.html" class="identifier">empty_sequence</a>>::type first; |
| typedef <a href="./end.html" class="identifier">end</a><<a href="./empty-sequence.html" class="identifier">empty_sequence</a>>::type last; |
| |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same<first,last> )); |
| <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 ); |
| |
| typedef <a href="./transform-view.html" class="identifier">transform_view</a>< |
| <a href="./empty-sequence.html" class="identifier">empty_sequence</a> |
| , add_pointer<_> |
| > empty_view; |
| |
| <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 ); |
| </pre> |
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| <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="./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> |
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