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- <title>The MPL Reference Manual: remove_if</title>
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- <div class="section" id="remove-if">
- <h1><a class="toc-backref" href="./transformation-algorithms.html#id1492">remove_if</a></h1>
- <div class="section" id="id669">
- <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
- <pre class="literal-block">
- template<
- typename Sequence
- , typename Pred
- , typename In = <em>unspecified</em>
- >
- struct <a href="./remove-if.html" class="identifier">remove_if</a>
- {
- typedef <em>unspecified</em> type;
- };
- </pre>
- </div>
- <div class="section" id="id670">
- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <p>Returns a new sequence that contains all the elements from [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><Sequence>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><Sequence>::type</span></tt>) range
- except those that satisfy the predicate <tt class="literal"><span class="pre">Pred</span></tt>.</p>
- <!-- Returns a copy of the original sequence with all elements satisfying the predicate
- ``Pred`` removed. -->
- <p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the
- <cite>Expression semantics</cite> subsection for a precise specification of the algorithm's
- details in all cases — <em>end note</em>]</p>
- </div>
- <div class="section" id="id671">
- <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
- <pre class="literal-block">
- #include <<a href="../../../../boost/mpl/remove_if.hpp" class="header">boost/mpl/remove_if.hpp</a>>
- </pre>
- </div>
- <div class="section" id="id672">
- <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
- <p><a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a></p>
- </div>
- <div class="section" id="id673">
- <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
- <table border="1" class="docutils table">
- <colgroup>
- <col width="19%" />
- <col width="43%" />
- <col width="38%" />
- </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="./forward-sequence.html">Forward Sequence</a></td>
- <td>An original sequence.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre">Pred</span></tt></td>
- <td>Unary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td>
- <td>A removal condition.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre">In</span></tt></td>
- <td><a class="reference internal" href="./inserter.html">Inserter</a></td>
- <td>An inserter.</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id674">
- <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="./reversible-algorithm.html">Reversible Algorithm</a>.</p>
- <p>For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, and an <a class="reference internal" href="./inserter.html">Inserter</a> <tt class="literal"><span class="pre">in</span></tt>, and an unary
- <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">pred</span></tt>:</p>
- <pre class="literal-block">
- typedef <a href="./remove-if.html" class="identifier">remove_if</a><s,pred,in>::type r;
- </pre>
- <table class="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 type.</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="./lambda.html" class="identifier">lambda</a><pred>::type p;
- typedef <a href="./lambda.html" class="identifier">lambda</a><in::operation>::type op;
- typedef <a href="./fold.html" class="identifier">fold</a><
- s
- , in::state
- , <a href="./eval-if.html" class="identifier">eval_if</a><
- <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">1</span></tt><p,<a href="./placeholders.html" class="identifier">_2</a>>
- , <a href="./identity.html" class="identifier">identity</a><<a href="./placeholders.html" class="identifier">_1</a>>
- , <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt><op,<a href="./placeholders.html" class="identifier">_1</a>,<a href="./placeholders.html" class="identifier">_2</a>>
- >
- >::type r;
- </pre>
- </td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id675">
- <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
- <p>Linear. Performs exactly <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span></tt> applications of <tt class="literal"><span class="pre">pred</span></tt>, and at
- most <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span></tt> insertions.</p>
- </div>
- <div class="section" id="id676">
- <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,1,4,5,2,7,5,3,5>::type numbers;
- typedef <a href="./remove-if.html" class="identifier">remove_if</a>< numbers, <a href="./greater.html" class="identifier">greater</a><_,<a href="./int.html" class="identifier">int_</a><4> > >::type result;
- <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>< result,<a href="./vector-c.html" class="identifier">vector_c</a><int,1,4,2,3>,<a href="./equal-to.html" class="identifier">equal_to</a><_,_> > ));
- </pre>
- </div>
- <div class="section" id="id677">
- <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
- <p><a class="reference internal" href="./transformation-algorithms.html">Transformation Algorithms</a>, <a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a>, <a class="reference internal" href="./reverse-remove-if.html">reverse_remove_if</a>, <a class="reference internal" href="./remove.html">remove</a>, <a class="reference internal" href="./copy-if.html">copy_if</a>, <a class="reference internal" href="./replace-if.html">replace_if</a></p>
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