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| <div class="section" id="clear"> |
| <h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1429">clear</a></h1> |
| <div class="section" id="id211"> |
| <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> |
| <pre class="literal-block"> |
| template< |
| typename Sequence |
| > |
| struct <a href="./clear.html" class="identifier">clear</a> |
| { |
| typedef <em>unspecified</em> type; |
| }; |
| </pre> |
| </div> |
| <div class="section" id="id212"> |
| <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> |
| <p>Returns an empty sequence <a class="reference internal" href="./terminology.html#concept-identical">concept-identical</a> to <tt class="literal"><span class="pre">Sequence</span></tt>.</p> |
| </div> |
| <div class="section" id="id213"> |
| <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> |
| <pre class="literal-block"> |
| #include <<a href="../../../../boost/mpl/clear.hpp" class="header">boost/mpl/clear.hpp</a>> |
| </pre> |
| </div> |
| <div class="section" id="id214"> |
| <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> |
| <p><a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a></p> |
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| <div class="section" id="id215"> |
| <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> |
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| <tr><th class="head">Parameter</th> |
| <th class="head">Requirement</th> |
| <th class="head">Description</th> |
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| <tbody valign="top"> |
| <tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td> |
| <td><a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a> or |
| <a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a></td> |
| <td>A sequence to get an empty "copy" of.</td> |
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| </table> |
| </div> |
| <div class="section" id="id216"> |
| <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> |
| <p>For any <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a> or <a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a> <tt class="literal"><span class="pre">s</span></tt>:</p> |
| <pre class="literal-block"> |
| typedef <a href="./clear.html" class="identifier">clear</a><s>::type t; |
| </pre> |
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| <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first"><a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a> or <a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a>.</p> |
| </td> |
| </tr> |
| <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> |
| <pre class="literal-block"> |
| typedef <a href="./erase.html" class="identifier">erase</a>< s, <a href="./begin.html" class="identifier">begin</a><s>::type, <a href="./end.html" class="identifier">end</a><s>::type >::type t; |
| </pre> |
| </td> |
| </tr> |
| <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first last"><tt class="literal"><span class="pre"><a href="./empty.html" class="identifier">empty</a><s>::value</span> <span class="pre">==</span> <span class="pre">true</span></tt>.</p> |
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| <div class="section" id="id217"> |
| <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> |
| <p>Amortized constant time.</p> |
| </div> |
| <div class="section" id="id218"> |
| <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> |
| <pre class="literal-block"> |
| typedef <a href="./vector-c.html" class="identifier">vector_c</a><int,1,3,5,7,9,11> odds; |
| typedef <a href="./clear.html" class="identifier">clear</a><odds>::type nothing; |
| |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./empty.html" class="identifier">empty</a><nothing> )); |
| </pre> |
| </div> |
| <div class="section" id="id219"> |
| <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> |
| <p><a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>, <a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a>, <a class="reference internal" href="./erase.html">erase</a>, <a class="reference internal" href="./empty.html">empty</a>, <a class="reference internal" href="./begin.html">begin</a>, <a class="reference internal" href="./end.html">end</a></p> |
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| <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> |
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