ceph/src/boost/libs/mpl/doc/refmanual/inherit-linearly.html

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   7 <title>The MPL Reference Manual: inherit_linearly</title>
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  11 <table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./inherit.html" class="navigation-link">Prev</a>&nbsp;<a href="./numeric-cast.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./inherit.html" class="navigation-link">Back</a>&nbsp;<a href="./numeric-cast.html" class="navigation-link">Along</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./miscellaneous.html" class="navigation-link">Up</a>&nbsp;<a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</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="./metafunctions.html" class="navigation-link">Metafunctions</a> / <a href="./miscellaneous.html" class="navigation-link">Miscellaneous</a> / <a href="./inherit-linearly.html" class="navigation-link">inherit_linearly</a></td>
  13 </tr></table><div class="header-separator"></div>
  14 <div class="section" id="inherit-linearly">
  15 <h1><a class="toc-backref" href="./miscellaneous.html#id1567">inherit_linearly</a></h1>
  16 <div class="section" id="id1172">
  17 <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
  18 <pre class="literal-block">
  19 template&lt;
  20       typename Types
  21     , typename Node
  22     , typename Root = <a href="./empty-base.html" class="identifier">empty_base</a>
  23     &gt;
  24 struct <a href="./inherit-linearly.html" class="identifier">inherit_linearly</a>
  25     : <a href="./fold.html" class="identifier">fold</a>&lt;Types,Root,Node&gt;
  26 {
  27 };
  28 </pre>
  29 </div>
  30 <div class="section" id="id1173">
  31 <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
  32 <p>A convenience wrapper for <tt class="literal"><span class="pre"><a href="./fold.html" class="identifier">fold</a></span></tt> to use in the context of sequence-driven
  33 class composition. Returns the result the successive application of binary
  34 <tt class="literal"><span class="pre">Node</span></tt> to the result of the previous <tt class="literal"><span class="pre">Node</span></tt> invocation (<tt class="literal"><span class="pre">Root</span></tt> if it's
  35 the first call) and every type in the <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">Types</span></tt> in order.</p>
  36 </div>
  37 <div class="section" id="id1174">
  38 <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
  39 <pre class="literal-block">
  40 #include &lt;<a href="../../../../boost/mpl/inherit_linearly.hpp" class="header">boost/mpl/inherit_linearly.hpp</a>&gt;
  41 </pre>
  42 </div>
  43 <div class="section" id="id1175">
  44 <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
  45 <p><a class="reference internal" href="./metafunction.html">Metafunction</a></p>
  46 </div>
  47 <div class="section" id="id1176">
  48 <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
  49 <table border="1" class="docutils table">
  50 <colgroup>
  51 <col width="15%" />
  52 <col width="32%" />
  53 <col width="53%" />
  54 </colgroup>
  55 <thead valign="bottom">
  56 <tr><th class="head">Parameter</th>
  57 <th class="head">Requirement</th>
  58 <th class="head">Description</th>
  59 </tr>
  60 </thead>
  61 <tbody valign="top">
  62 <tr><td><tt class="literal"><span class="pre">Types</span></tt></td>
  63 <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
  64 <td>Types to inherit from.</td>
  65 </tr>
  66 <tr><td><tt class="literal"><span class="pre">Node</span></tt></td>
  67 <td>Binary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td>
  68 <td>A derivation metafunction.</td>
  69 </tr>
  70 <tr><td><tt class="literal"><span class="pre">Root</span></tt></td>
  71 <td>A class type</td>
  72 <td>A type to be placed at the root of the class
  73 hierarchy.</td>
  74 </tr>
  75 </tbody>
  76 </table>
  77 </div>
  78 <div class="section" id="id1177">
  79 <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
  80 <p>For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">types</span></tt>, binary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">node</span></tt>, and arbitrary
  81 class type <tt class="literal"><span class="pre">root</span></tt>:</p>
  82 <pre class="literal-block">
  83 typedef <a href="./inherit-linearly.html" class="identifier">inherit_linearly</a>&lt;types,node,root&gt;::type r;
  84 </pre>
  85 <table class="docutils field-list" frame="void" rules="none">
  86 <col class="field-name" />
  87 <col class="field-body" />
  88 <tbody valign="top">
  89 <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A class type.</p>
  90 </td>
  91 </tr>
  92 <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
  93 <pre class="last literal-block">
  94 typedef <a href="./fold.html" class="identifier">fold</a>&lt;types,root,node&gt;::type r;
  95 </pre>
  96 </td>
  97 </tr>
  98 </tbody>
  99 </table>
 100 </div>
 101 <div class="section" id="id1178">
 102 <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
 103 <p>Linear. Exactly <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;types&gt;::value</span></tt> applications of <tt class="literal"><span class="pre">node</span></tt>.</p>
 104 </div>
 105 <div class="section" id="id1179">
 106 <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
 107 <pre class="literal-block">
 108 template&lt; typename T &gt; struct tuple_field
 109 {
 110     T field;
 111 };
 112
 113 template&lt; typename T &gt;
 114 inline
 115 T&amp; field(tuple_field&lt;T&gt;&amp; t)
 116 {
 117     return t.field;
 118 }
 119
 120 typedef <a href="./inherit-linearly.html" class="identifier">inherit_linearly</a>&lt;
 121       <a href="./vector.html" class="identifier">vector</a>&lt;int,char const*,bool&gt;
 122     , <a href="./inherit.html" class="identifier">inherit</a>&lt; <a href="./placeholders.html" class="identifier">_1</a>, tuple_field&lt;<a href="./placeholders.html" class="identifier">_2</a>&gt; &gt;
 123     &gt;::type tuple;
 124
 125
 126 int main()
 127 {
 128     tuple t;
 129
 130     field&lt;int&gt;(t) = -1;
 131     field&lt;char const*&gt;(t) = &quot;text&quot;;
 132     field&lt;bool&gt;(t) = false;
 133
 134     std::cout
 135         &lt;&lt; field&lt;int&gt;(t) &lt;&lt; 'n'
 136         &lt;&lt; field&lt;char const*&gt;(t) &lt;&lt; 'n'
 137         &lt;&lt; field&lt;bool&gt;(t) &lt;&lt; 'n'
 138         ;
 139 }
 140 </pre>
 141 </div>
 142 <div class="section" id="id1180">
 143 <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
 144 <p><a class="reference internal" href="./metafunctions.html">Metafunctions</a>, <a class="reference internal" href="./algorithms.html">Algorithms</a>, <a class="reference internal" href="./inherit.html">inherit</a>, <a class="reference internal" href="./empty-base.html">empty_base</a>, <a class="reference internal" href="./fold.html">fold</a>, <a class="reference internal" href="./reverse-fold.html">reverse_fold</a></p>
 145 <!-- Metafunctions/Miscellaneous//numeric_cast |50 -->
 146 </div>
 147 </div>
 148
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 151 <td><div class="copyright-footer"><div class="copyright">Copyright ©  2001-2009 Aleksey Gurtovoy and David Abrahams</div>
 152 Distributed under the Boost Software License, Version 1.0. (See accompanying
 153 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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