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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#id491" name="inherit-linearly">inherit_linearly</a></h1>
16<div class="section" id="miscellaneous-inherit-synopsis">
17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
18<pre class="literal-block">
19template&lt;
20      typename Types
21    , typename Node
22    , typename Root = <a href="./empty-base.html" class="identifier">empty_base</a>
23    &gt;
24struct <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="miscellaneous-inherit-description">
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
33class 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
35the first call) and every type in the <a class="reference" 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="miscellaneous-inherit-header">
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="miscellaneous-inherit-model-of">
44<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
45<p><a class="reference" href="./metafunction.html">Metafunction</a></p>
46</div>
47<div class="section" id="miscellaneous-inherit-parameters">
48<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
49<table border="1" class="table">
50<colgroup>
51<col width="15%" />
52<col width="32%" />
53<col width="53%" />
54</colgroup>
55<thead valign="bottom">
56<tr><th>Parameter</th>
57<th>Requirement</th>
58<th>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" 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" 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
73hierarchy.</td>
74</tr>
75</tbody>
76</table>
77</div>
78<div class="section" id="miscellaneous-inherit-expression-semantics">
79<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
80<p>For any <a class="reference" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">types</span></tt>, binary <a class="reference" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">node</span></tt>, and arbitrary
81class type <tt class="literal"><span class="pre">root</span></tt>:</p>
82<pre class="literal-block">
83typedef <a href="./inherit-linearly.html" class="identifier">inherit_linearly</a>&lt;types,node,root&gt;::type r;
84</pre>
85<table class="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">A class type.</td>
90</tr>
91<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
92<pre class="last literal-block">
93typedef <a href="./fold.html" class="identifier">fold</a>&lt;types,root,node&gt;::type r;
94</pre>
95</td>
96</tr>
97</tbody>
98</table>
99</div>
100<div class="section" id="miscellaneous-inherit-complexity">
101<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
102<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>
103</div>
104<div class="section" id="miscellaneous-inherit-example">
105<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
106<pre class="literal-block">
107template&lt; typename T &gt; struct tuple_field
108{
109    T field;
110};
111
112template&lt; typename T &gt;
113inline
114T&amp; field(tuple_field&lt;T&gt;&amp; t)
115{
116    return t.field;
117}
118
119typedef <a href="./inherit-linearly.html" class="identifier">inherit_linearly</a>&lt;
120      <a href="./vector.html" class="identifier">vector</a>&lt;int,char const*,bool&gt;
121    , <a href="./inherit.html" class="identifier">inherit</a>&lt; _1, tuple_field&lt;_2&gt; &gt;
122    &gt;::type tuple;
123
124
125int main()
126{
127    tuple t;
128   
129    field&lt;int&gt;(t) = -1;
130    field&lt;char const*&gt;(t) = &quot;text&quot;;
131    field&lt;bool&gt;(t) = false;
132
133    std::cout
134        &lt;&lt; field&lt;int&gt;(t) &lt;&lt; 'n'
135        &lt;&lt; field&lt;char const*&gt;(t) &lt;&lt; 'n'
136        &lt;&lt; field&lt;bool&gt;(t) &lt;&lt; 'n'
137        ;
138}
139</pre>
140</div>
141<div class="section" id="miscellaneous-inherit-see-also">
142<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
143<p><a class="reference" href="./metafunctions.html">Metafunctions</a>, <a class="reference" href="./algorithms.html">Algorithms</a>, <a class="refentry reference" href="./inherit.html"><tt class="refentry literal"><span class="pre">inherit</span></tt></a>, <a class="refentry reference" href="./empty-base.html"><tt class="refentry literal"><span class="pre">empty_base</span></tt></a>, <a class="refentry reference" href="./fold.html"><tt class="refentry literal"><span class="pre">fold</span></tt></a>, <a class="refentry reference" href="./reverse-fold.html"><tt class="refentry literal"><span class="pre">reverse_fold</span></tt></a></p>
144<!-- modtime: November 10, 2004 04:40:14 +0000 -->
145<!-- Metafunctions/Miscellaneous//numeric_cast |50 -->
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