166 lines
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166 lines
11 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" />
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<title>The MPL Reference Manual: for_each</title>
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<body class="docframe refmanual">
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<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./runtime-algorithms.html" class="navigation-link">Prev</a> <a href="./metafunctions.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./runtime-algorithms.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
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<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./algorithms.html" class="navigation-link">Algorithms</a> / <a href="./runtime-algorithms.html" class="navigation-link">Runtime Algorithms</a> / <a href="./for-each.html" class="navigation-link">for_each</a></td>
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</tr></table><div class="header-separator"></div>
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<div class="section" id="for-each">
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<h1><a class="toc-backref" href="./runtime-algorithms.html#id1509">for_each</a></h1>
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<div class="section" id="id812">
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<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
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<pre class="literal-block">
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template<
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typename Sequence
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, typename F
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>
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void <a href="./for-each.html" class="identifier">for_each</a>( F f );
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template<
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typename Sequence
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, typename TransformOp
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, typename F
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>
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void <a href="./for-each.html" class="identifier">for_each</a>( F f );
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</pre>
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</div>
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<div class="section" id="id813">
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<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
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<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>
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<ul class="simple">
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<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
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<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>
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<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
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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
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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>
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</ul>
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</div>
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<div class="section" id="id814">
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<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
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<pre class="literal-block">
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#include <<a href="../../../../boost/mpl/for_each.hpp" class="header">boost/mpl/for_each.hpp</a>>
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</pre>
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</div>
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<div class="section" id="id815">
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<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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<table border="1" class="docutils table">
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<colgroup>
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<col width="21%" />
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<col width="39%" />
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<col width="39%" />
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</colgroup>
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<thead valign="bottom">
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<tr><th class="head">Parameter</th>
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<th class="head">Requirement</th>
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<th class="head">Description</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
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<td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
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<td>A sequence to iterate.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre">TransformOp</span></tt></td>
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<td><a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td>
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<td>A transformation.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre">f</span></tt></td>
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<td>An <a class="reference external" href="https://boost.org/sgi/stl/UnaryFunction.html" target="_top">unary function object</a></td>
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<td>A runtime operation to apply.</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="id816">
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<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
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<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
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<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>
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<pre class="literal-block">
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<a href="./for-each.html" class="identifier">for_each</a><s>( f );
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</pre>
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<table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<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>
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</td>
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</tr>
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<tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first">Equivalent to</p>
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<pre class="literal-block">
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typedef <a href="./begin.html" class="identifier">begin</a><Sequence>::type i<sub>1</sub>;
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<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>;
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f(boost::get(x<sub>1</sub>));
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typedef <a href="./next.html" class="identifier">next</a><i<sub>1</sub>>::type i<sub>2</sub>;
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<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>;
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f(boost::get(x<sub>2</sub>));
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<em>...</em>
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<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>;
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f(boost::get(x<sub>n</sub>));
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typedef <a href="./next.html" class="identifier">next</a><i<sub>n</sub>>::type last;
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</pre>
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<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
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<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>
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</td>
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</tr>
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</tbody>
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</table>
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<pre class="literal-block">
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<a href="./for-each.html" class="identifier">for_each</a><s,op>( f );
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</pre>
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<table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<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>
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</td>
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</tr>
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<tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first">Equivalent to</p>
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<pre class="last literal-block">
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<a href="./for-each.html" class="identifier">for_each</a>< <a href="./transform-view.html" class="identifier">transform_view</a><s,op> >( f );
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</pre>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="id817">
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<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
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<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>
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</div>
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<div class="section" id="id818">
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<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
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<pre class="literal-block">
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struct value_printer
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{
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template< typename U > void operator()(U x)
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{
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std::cout << x << '\n';
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}
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};
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int main()
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{
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<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() );
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}
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</pre>
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</div>
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<div class="section" id="id819">
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<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
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<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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</div>
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</div>
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<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./runtime-algorithms.html" class="navigation-link">Prev</a> <a href="./metafunctions.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./runtime-algorithms.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
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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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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</div></td></tr></table></body>
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