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| 6 | <meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> | |
| 7 | <title>The MPL Reference Manual: for_each</title> | |
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| 9 | </head> | |
| 10 | <body class="docframe refmanual"> | |
| 11 | <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> | |
| 12 | <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> | |
| 13 | </tr></table><div class="header-separator"></div> | |
| 14 | <div class="section" id="for-each"> | |
| 15 | <h1><a class="toc-backref" href="./runtime-algorithms.html#id1509">for_each</a></h1> | |
| 16 | <div class="section" id="id812"> | |
| 17 | <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> | |
| 18 | <pre class="literal-block"> | |
| 19 | template< | |
| 20 | typename Sequence | |
| 21 | , typename F | |
| 22 | > | |
| 23 | void <a href="./for-each.html" class="identifier">for_each</a>( F f ); | |
| 24 | ||
| 25 | template< | |
| 26 | typename Sequence | |
| 27 | , typename TransformOp | |
| 28 | , typename F | |
| 29 | > | |
| 30 | void <a href="./for-each.html" class="identifier">for_each</a>( F f ); | |
| 31 | </pre> | |
| 32 | </div> | |
| 33 | <div class="section" id="id813"> | |
| 34 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
| 35 | <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> | |
| 36 | <ul class="simple"> | |
| 37 | <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 | |
| 38 | <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> | |
| 39 | <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 | |
| 40 | 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 | |
| 41 | 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> | |
| 42 | </ul> | |
| 43 | </div> | |
| 44 | <div class="section" id="id814"> | |
| 45 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> | |
| 46 | <pre class="literal-block"> | |
| 47 | #include <<a href="../../../../boost/mpl/for_each.hpp" class="header">boost/mpl/for_each.hpp</a>> | |
| 48 | </pre> | |
| 49 | </div> | |
| 50 | <div class="section" id="id815"> | |
| 51 | <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> | |
| 52 | <table border="1" class="docutils table"> | |
| 53 | <colgroup> | |
| 54 | <col width="21%" /> | |
| 55 | <col width="39%" /> | |
| 56 | <col width="39%" /> | |
| 57 | </colgroup> | |
| 58 | <thead valign="bottom"> | |
| 59 | <tr><th class="head">Parameter</th> | |
| 60 | <th class="head">Requirement</th> | |
| 61 | <th class="head">Description</th> | |
| 62 | </tr> | |
| 63 | </thead> | |
| 64 | <tbody valign="top"> | |
| 65 | <tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td> | |
| 66 | <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> | |
| 67 | <td>A sequence to iterate.</td> | |
| 68 | </tr> | |
| 69 | <tr><td><tt class="literal"><span class="pre">TransformOp</span></tt></td> | |
| 70 | <td><a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td> | |
| 71 | <td>A transformation.</td> | |
| 72 | </tr> | |
| 73 | <tr><td><tt class="literal"><span class="pre">f</span></tt></td> | |
| 74 | <td>An <a class="reference external" href="http://www.sgi.com/tech/stl/UnaryFunction.html" target="_top">unary function object</a></td> | |
| 75 | <td>A runtime operation to apply.</td> | |
| 76 | </tr> | |
| 77 | </tbody> | |
| 78 | </table> | |
| 79 | </div> | |
| 80 | <div class="section" id="id816"> | |
| 81 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
| 82 | <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 | |
| 83 | <a class="reference external" href="http://www.sgi.com/tech/stl/UnaryFunction.html" target="_top">unary function object</a> <tt class="literal"><span class="pre">f</span></tt>:</p> | |
| 84 | <pre class="literal-block"> | |
| 85 | <a href="./for-each.html" class="identifier">for_each</a><s>( f ); | |
| 86 | </pre> | |
| 87 | <table class="docutils field-list" frame="void" rules="none"> | |
| 88 | <col class="field-name" /> | |
| 89 | <col class="field-body" /> | |
| 90 | <tbody valign="top"> | |
| 91 | <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> | |
| 92 | </td> | |
| 93 | </tr> | |
| 94 | <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first">Equivalent to</p> | |
| 95 | <pre class="literal-block"> | |
| 96 | typedef <a href="./begin.html" class="identifier">begin</a><Sequence>::type i<sub>1</sub>; | |
| 97 | <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>; | |
| 98 | f(boost::get(x<sub>1</sub>)); | |
| 99 | ||
| 100 | typedef <a href="./next.html" class="identifier">next</a><i<sub>1</sub>>::type i<sub>2</sub>; | |
| 101 | <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>; | |
| 102 | f(boost::get(x<sub>2</sub>)); | |
| 103 | <em>...</em> | |
| 104 | <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>; | |
| 105 | f(boost::get(x<sub>n</sub>)); | |
| 106 | typedef <a href="./next.html" class="identifier">next</a><i<sub>n</sub>>::type last; | |
| 107 | </pre> | |
| 108 | <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 | |
| 109 | <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> | |
| 110 | </td> | |
| 111 | </tr> | |
| 112 | </tbody> | |
| 113 | </table> | |
| 114 | <pre class="literal-block"> | |
| 115 | <a href="./for-each.html" class="identifier">for_each</a><s,op>( f ); | |
| 116 | </pre> | |
| 117 | <table class="docutils field-list" frame="void" rules="none"> | |
| 118 | <col class="field-name" /> | |
| 119 | <col class="field-body" /> | |
| 120 | <tbody valign="top"> | |
| 121 | <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> | |
| 122 | </td> | |
| 123 | </tr> | |
| 124 | <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first">Equivalent to</p> | |
| 125 | <pre class="last literal-block"> | |
| 126 | <a href="./for-each.html" class="identifier">for_each</a>< <a href="./transform-view.html" class="identifier">transform_view</a><s,op> >( f ); | |
| 127 | </pre> | |
| 128 | </td> | |
| 129 | </tr> | |
| 130 | </tbody> | |
| 131 | </table> | |
| 132 | </div> | |
| 133 | <div class="section" id="id817"> | |
| 134 | <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> | |
| 135 | <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> | |
| 136 | </div> | |
| 137 | <div class="section" id="id818"> | |
| 138 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> | |
| 139 | <pre class="literal-block"> | |
| 140 | struct value_printer | |
| 141 | { | |
| 142 | template< typename U > void operator()(U x) | |
| 143 | { | |
| 144 | std::cout << x << '\n'; | |
| 145 | } | |
| 146 | }; | |
| 147 | ||
| 148 | int main() | |
| 149 | { | |
| 150 | <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() ); | |
| 151 | } | |
| 152 | </pre> | |
| 153 | </div> | |
| 154 | <div class="section" id="id819"> | |
| 155 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
| 156 | <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> | |
| 157 | </div> | |
| 158 | </div> | |
| 159 | ||
| 160 | <div class="footer-separator"></div> | |
| 161 | <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> | |
| 162 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
| 163 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 164 | 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> | |
| 165 | </html> |