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| <title>The MPL Reference Manual: erase</title> |
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| <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="./intrinsic-metafunctions.html" class="navigation-link">Intrinsic Metafunctions</a> / <a href="./erase.html" class="navigation-link">erase</a></td> |
| </tr></table><div class="header-separator"></div> |
| <div class="section" id="erase"> |
| <h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1432">erase</a></h1> |
| <div class="section" id="id238"> |
| <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> |
| <pre class="literal-block"> |
| template< |
| typename Sequence |
| , typename First |
| , typename Last = <em>unspecified</em> |
| > |
| struct <a href="./erase.html" class="identifier">erase</a> |
| { |
| typedef <em>unspecified</em> type; |
| }; |
| </pre> |
| </div> |
| <div class="section" id="id239"> |
| <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> |
| <p><tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a></span></tt> performs a removal of one or more adjacent elements in the sequence |
| starting from an arbitrary position.</p> |
| </div> |
| <div class="section" id="id240"> |
| <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> |
| <pre class="literal-block"> |
| #include <<a href="../../../../boost/mpl/erase.hpp" class="header">boost/mpl/erase.hpp</a>> |
| </pre> |
| </div> |
| <div class="section" id="id241"> |
| <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> |
| </div> |
| <div class="section" id="id242"> |
| <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> |
| <table border="1" class="docutils table"> |
| <colgroup> |
| <col width="15%" /> |
| <col width="36%" /> |
| <col width="48%" /> |
| </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">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 erase from.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre">First</span></tt></td> |
| <td><a class="reference internal" href="./forward-iterator.html">Forward Iterator</a></td> |
| <td>An iterator to the beginning of the range to |
| be erased.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre">Last</span></tt></td> |
| <td><a class="reference internal" href="./forward-iterator.html">Forward Iterator</a></td> |
| <td>An iterator past-the-end of the range to be |
| erased.</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="id243"> |
| <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> |
| <div class="expression-semantics compound"> |
| <p class="compound-first">For any <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, and iterators <tt class="literal"><span class="pre">pos</span></tt>, <tt class="literal"><span class="pre">first</span></tt> and <tt class="literal"><span class="pre">last</span></tt> into <tt class="literal"><span class="pre">s</span></tt>:</p> |
| <pre class="compound-middle literal-block"> |
| typedef <a href="./erase.html" class="identifier">erase</a><s,first,last>::type r; |
| </pre> |
| <table class="compound-middle docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <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>.</p> |
| </td> |
| </tr> |
| <tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre">[first,last)</span></tt> is a valid range in <tt class="literal"><span class="pre">s</span></tt>.</p> |
| </td> |
| </tr> |
| <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre">r</span></tt> is a new sequence, <a class="reference internal" href="./terminology.html#concept-identical">concept-identical</a> to <tt class="literal"><span class="pre">s</span></tt>, of the following elements: |
| [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><s>::type</span></tt>, <tt class="literal"><span class="pre">pos</span></tt>), [<tt class="literal"><span class="pre">last</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><s>::type</span></tt>).</p> |
| </td> |
| </tr> |
| <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first">The relative order of the elements in <tt class="literal"><span class="pre">r</span></tt> is the same as in <tt class="literal"><span class="pre">s</span></tt>;</p> |
| <pre class="last literal-block"> |
| <a href="./size.html" class="identifier">size</a><r>::value == <a href="./size.html" class="identifier">size</a><s>::value - <a href="./distance.html" class="identifier">distance</a><first,last>::value |
| </pre> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <!-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ --> |
| <pre class="compound-middle literal-block"> |
| typedef <a href="./erase.html" class="identifier">erase</a><s,pos>::type r; |
| </pre> |
| <table class="compound-last docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <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>.</p> |
| </td> |
| </tr> |
| <tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre">pos</span></tt> is a dereferenceable iterator in <tt class="literal"><span class="pre">s</span></tt>.</p> |
| </td> |
| </tr> |
| <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> |
| <pre class="last literal-block"> |
| typedef <a href="./erase.html" class="identifier">erase</a>< s,pos,<a href="./next.html" class="identifier">next</a><pos>::type >::type r; |
| </pre> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="expression-semantics compound"> |
| <p class="compound-first">For any <a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, and iterator <tt class="literal"><span class="pre">pos</span></tt> into <tt class="literal"><span class="pre">s</span></tt>:</p> |
| <pre class="compound-middle literal-block"> |
| typedef <a href="./erase.html" class="identifier">erase</a><s,pos>::type r; |
| </pre> |
| <table class="compound-last docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>.</td> |
| </tr> |
| <tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><tt class="literal"><span class="pre">pos</span></tt> is a dereferenceable iterator to <tt class="literal"><span class="pre">s</span></tt>.</td> |
| </tr> |
| <tr class="field"><th class="field-name">Semantics:</th><td class="field-body">Erases the element at a specific position <tt class="literal"><span class="pre">pos</span></tt>; equivalent to |
| <tt class="literal"><span class="pre"><a href="./erase-key.html" class="identifier">erase_key</a><s,</span> <span class="pre"><a href="./deref.html" class="identifier">deref</a><pos>::type</span> <span class="pre">>::type</span></tt>.</td> |
| </tr> |
| <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><r>::value</span> <span class="pre">==</span> <span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span> <span class="pre">-</span> <span class="pre">1</span></tt>.</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="section" id="id244"> |
| <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> |
| <table border="1" class="docutils table"> |
| <colgroup> |
| <col width="45%" /> |
| <col width="55%" /> |
| </colgroup> |
| <thead valign="bottom"> |
| <tr><th class="head">Sequence archetype</th> |
| <th class="head">Complexity (the range form)</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr><td><a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a></td> |
| <td>Amortized constant time.</td> |
| </tr> |
| <tr><td><a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a></td> |
| <td>Quadratic in the worst case, linear at best.</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="id245"> |
| <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,1,0,5,1,7,5,0,5> values; |
| typedef <a href="./find.html" class="identifier">find</a>< values, <a href="./integral-c.html" class="identifier">integral_c</a><int,7> >::type pos; |
| typedef <a href="./erase.html" class="identifier">erase</a><values,pos>::type result; |
| |
| <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><result>::value, ==, 7 ); |
| |
| typedef <a href="./find.html" class="identifier">find</a><result, <a href="./integral-c.html" class="identifier">integral_c</a><int,7> >::type iter; |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< iter, <a href="./end.html" class="identifier">end</a><result>::type > )); |
| </pre> |
| </div> |
| <div class="section" id="id246"> |
| <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-key.html">erase_key</a>, <a class="reference internal" href="./pop-front.html">pop_front</a>, <a class="reference internal" href="./pop-back.html">pop_back</a>, <a class="reference internal" href="./insert.html">insert</a></p> |
| <!-- Sequences/Intrinsic Metafunctions//erase_key --> |
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| Distributed under the Boost Software License, Version 1.0. (See accompanying |
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