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- <div class="section" id="for-each">
- <h1><a class="toc-backref" href="./runtime-algorithms.html#id1509">for_each</a></h1>
- <div class="section" id="id812">
- <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
- <pre class="literal-block">
- template<
- typename Sequence
- , typename F
- >
- void <a href="./for-each.html" class="identifier">for_each</a>( F f );
- template<
- typename Sequence
- , typename TransformOp
- , typename F
- >
- void <a href="./for-each.html" class="identifier">for_each</a>( F f );
- </pre>
- </div>
- <div class="section" id="id813">
- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <p><tt class="literal"><span class="pre"><a href="./for-each.html" class="identifier">for_each</a></span></tt> is a family of overloaded function templates:</p>
- <ul class="simple">
- <li><tt class="literal"><span class="pre"><a href="./for-each.html" class="identifier">for_each</a><Sequence>(</span> <span class="pre">f</span> <span class="pre">)</span></tt> applies the runtime function object
- <tt class="literal"><span class="pre">f</span></tt> to every element in the [<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.</li>
- <li><tt class="literal"><span class="pre"><a href="./for-each.html" class="identifier">for_each</a><Sequence,TransformOp>(</span> <span class="pre">f</span> <span class="pre">)</span></tt> applies the runtime function
- object <tt class="literal"><span class="pre">f</span></tt> to the result of the transformation <tt class="literal"><span class="pre">TransformOp</span></tt> of
- every element in the [<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.</li>
- </ul>
- </div>
- <div class="section" id="id814">
- <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
- <pre class="literal-block">
- #include <<a href="../../../../boost/mpl/for_each.hpp" class="header">boost/mpl/for_each.hpp</a>>
- </pre>
- </div>
- <div class="section" id="id815">
- <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
- <table border="1" class="docutils table">
- <colgroup>
- <col width="21%" />
- <col width="39%" />
- <col width="39%" />
- </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>A sequence to iterate.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre">TransformOp</span></tt></td>
- <td><a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td>
- <td>A transformation.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre">f</span></tt></td>
- <td>An <a class="reference external" href="https://boost.org/sgi/stl/UnaryFunction.html" target="_top">unary function object</a></td>
- <td>A runtime operation to apply.</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id816">
- <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
- <p>For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">op</span></tt> , and an
- <a class="reference external" href="https://boost.org/sgi/stl/UnaryFunction.html" target="_top">unary function object</a> <tt class="literal"><span class="pre">f</span></tt>:</p>
- <pre class="literal-block">
- <a href="./for-each.html" class="identifier">for_each</a><s>( f );
- </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"><tt class="literal"><span class="pre">void</span></tt></p>
- </td>
- </tr>
- <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first">Equivalent to</p>
- <pre class="literal-block">
- typedef <a href="./begin.html" class="identifier">begin</a><Sequence>::type i<sub>1</sub>;
- <a class="reference external" href="http://www.boost.org/libs/utility/value_init.htm" target="_top">value_initialized</a>< <a href="./deref.html" class="identifier">deref</a><i<sub>1</sub>>::type > x<sub>1</sub>;
- f(boost::get(x<sub>1</sub>));
- typedef <a href="./next.html" class="identifier">next</a><i<sub>1</sub>>::type i<sub>2</sub>;
- <a class="reference external" href="http://www.boost.org/libs/utility/value_init.htm" target="_top">value_initialized</a>< <a href="./deref.html" class="identifier">deref</a><i<sub>2</sub>>::type > x<sub>2</sub>;
- f(boost::get(x<sub>2</sub>));
- <em>...</em>
- <a class="reference external" href="http://www.boost.org/libs/utility/value_init.htm" target="_top">value_initialized</a>< <a href="./deref.html" class="identifier">deref</a><i<sub>n</sub>>::type > x<sub>n</sub>;
- f(boost::get(x<sub>n</sub>));
- typedef <a href="./next.html" class="identifier">next</a><i<sub>n</sub>>::type last;
- </pre>
- <p class="last">where <tt class="literal"><span class="pre">n</span> <span class="pre">==</span> <span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span></tt> and <tt class="literal"><span class="pre">last</span></tt> is identical to
- <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><s>::type</span></tt>; no effect if <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>
- </td>
- </tr>
- </tbody>
- </table>
- <pre class="literal-block">
- <a href="./for-each.html" class="identifier">for_each</a><s,op>( f );
- </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"><tt class="literal"><span class="pre">void</span></tt></p>
- </td>
- </tr>
- <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first">Equivalent to</p>
- <pre class="last literal-block">
- <a href="./for-each.html" class="identifier">for_each</a>< <a href="./transform-view.html" class="identifier">transform_view</a><s,op> >( f );
- </pre>
- </td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id817">
- <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
- <p>Linear. 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">op</span></tt> and <tt class="literal"><span class="pre">f</span></tt>.</p>
- </div>
- <div class="section" id="id818">
- <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
- <pre class="literal-block">
- struct value_printer
- {
- template< typename U > void operator()(U x)
- {
- std::cout << x << '\n';
- }
- };
- int main()
- {
- <a href="./for-each.html" class="identifier">for_each</a>< <a href="./range-c.html" class="identifier">range_c</a><int,0,10> >( value_printer() );
- }
- </pre>
- </div>
- <div class="section" id="id819">
- <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
- <p><a class="reference internal" href="./runtime-algorithms.html">Runtime Algorithms</a>, <a class="reference internal" href="./views.html">Views</a>, <a class="reference internal" href="./transform-view.html">transform_view</a></p>
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