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nest-open-source / nest-learning-thermostat / 5.0 / boost / 317601cb979f96545d0e892ce7cfdf59f676ee0a / . / boost_1_45_0 / libs / mpl / doc / refmanual / inherit.html
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<div class="section" id="inherit">
<h1><a class="toc-backref" href="./miscellaneous.html#id1566">inherit</a></h1>
<div class="section" id="id1163">
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
<pre class="literal-block">
template&lt;
typename T1, typename T2
&gt;
struct <a href="./inherit.html" class="identifier">inherit</a><tt class="literal"><span class="pre">2</span></tt>
{
typedef <em>unspecified</em> type;
};
<em>...</em>
template&lt;
typename T1, typename T2,<em>...</em> typename T<em>n</em>
&gt;
struct <a href="./inherit.html" class="identifier">inherit</a><em>n</em>
{
typedef <em>unspecified</em> type;
};
template&lt;
typename T1
, typename T2
<em>...</em>
, typename T<em>n</em> = <em>unspecified</em>
&gt;
struct <a href="./inherit.html" class="identifier">inherit</a>
{
typedef <em>unspecified</em> type;
};
</pre>
</div>
<div class="section" id="id1164">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p>Returns an unspecified class type publically derived from <tt class="literal"><span class="pre">T1</span></tt>, <tt class="literal"><span class="pre">T2</span></tt>,... <tt class="literal"><span class="pre">Tn</span></tt>.
Guarantees that derivation from <a class="reference internal" href="./empty-base.html">empty_base</a> is always a no-op,
regardless of the position and number of <a class="reference internal" href="./empty-base.html">empty_base</a> classes in
<tt class="literal"><span class="pre">T1</span></tt>, <tt class="literal"><span class="pre">T2</span></tt>,... <tt class="literal"><span class="pre">Tn</span></tt>.</p>
</div>
<div class="section" id="id1165">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/inherit.hpp" class="header">boost/mpl/inherit.hpp</a>&gt;
</pre>
</div>
<div class="section" id="id1166">
<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
<p><a class="reference internal" href="./metafunction.html">Metafunction</a></p>
</div>
<div class="section" id="id1167">
<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
<table border="1" class="docutils table">
<colgroup>
<col width="22%" />
<col width="28%" />
<col width="51%" />
</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">T1</span></tt>, <tt class="literal"><span class="pre">T2</span></tt>,... <tt class="literal"><span class="pre">Tn</span></tt></td>
<td>A class type</td>
<td>Classes to derived from.</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="id1168">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>For artibrary class types <em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub>:</p>
<pre class="literal-block">
typedef inherit2&lt;t1,t2&gt;::type r;
</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">A class type.</p>
</td>
</tr>
<tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre">t1</span></tt> and <tt class="literal"><span class="pre">t2</span></tt> are complete types.</p>
</td>
</tr>
<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">If both <tt class="literal"><span class="pre">t1</span></tt> and <tt class="literal"><span class="pre">t2</span></tt> are identical to <tt class="literal"><span class="pre"><a href="./empty-base.html" class="identifier">empty_base</a></span></tt>, equivalent to</p>
<pre class="literal-block">
typedef <a href="./empty-base.html" class="identifier">empty_base</a> r;
</pre>
<p>otherwise, if <tt class="literal"><span class="pre">t1</span></tt> is identical to <tt class="literal"><span class="pre"><a href="./empty-base.html" class="identifier">empty_base</a></span></tt>, equivalent to</p>
<pre class="literal-block">
typedef t2 r;
</pre>
<p>otherwise, if <tt class="literal"><span class="pre">t2</span></tt> is identical to <tt class="literal"><span class="pre"><a href="./empty-base.html" class="identifier">empty_base</a></span></tt>, equivalent to</p>
<pre class="literal-block">
typedef t1 r;
</pre>
<p>otherwise equivalent to</p>
<pre class="last literal-block">
struct r : t1, t2 {};
</pre>
</td>
</tr>
</tbody>
</table>
<!-- ........................................................................... -->
<pre class="literal-block">
typedef <a href="./inherit.html" class="identifier">inherit</a><em>n</em>&lt;t1,t2,<em>...</em>t<em>n</em>&gt;::type r;
</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">A class type.</p>
</td>
</tr>
<tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><p class="first"><em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub> are complete types.</p>
</td>
</tr>
<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
<pre class="last literal-block">
struct r
: <a href="./inherit.html" class="identifier">inherit</a><tt class="literal"><span class="pre">2</span></tt>&lt;
<a href="./inherit.html" class="identifier">inherit</a><em>n-1</em>&lt;t1,t2,<em>...</em>t<em>n-1</em>&gt;::type
, t<em>n</em>
&gt;
{
};
</pre>
</td>
</tr>
</tbody>
</table>
<!-- ........................................................................... -->
<pre class="literal-block">
typedef <a href="./inherit.html" class="identifier">inherit</a>&lt;t1,t2,<em>...</em>t<em>n</em>&gt;::type r;
</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">Precondition:</th><td class="field-body"><p class="first"><em>t</em><sub>1</sub>,<em>t</em><sub>2</sub>,... <em>t</em><sub>n</sub> are complete types.</p>
</td>
</tr>
<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A class type.</p>
</td>
</tr>
<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
<pre class="last literal-block">
typedef <a href="./inherit.html" class="identifier">inherit</a><em>n</em>&lt;t1,t2,<em>...</em>t<em>n</em>&gt;::type r;
</pre>
</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="id1169">
<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
<p>Amortized constant time.</p>
</div>
<div class="section" id="id1170">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
struct udt1 { int n; };
struct udt2 {};
typedef <a href="./inherit.html" class="identifier">inherit</a>&lt;udt1,udt2&gt;::type r1;
typedef <a href="./inherit.html" class="identifier">inherit</a>&lt;<a href="./empty-base.html" class="identifier">empty_base</a>,udt1&gt;::type r2;
typedef <a href="./inherit.html" class="identifier">inherit</a>&lt;<a href="./empty-base.html" class="identifier">empty_base</a>,udt1,<a href="./empty-base.html" class="identifier">empty_base</a>,<a href="./empty-base.html" class="identifier">empty_base</a>&gt;::type r3;
typedef <a href="./inherit.html" class="identifier">inherit</a>&lt;udt1,<a href="./empty-base.html" class="identifier">empty_base</a>,udt2&gt;::type r4;
typedef <a href="./inherit.html" class="identifier">inherit</a>&lt;<a href="./empty-base.html" class="identifier">empty_base</a>,<a href="./empty-base.html" class="identifier">empty_base</a>&gt;::type r5;
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_base_and_derived&lt; udt1, r1&gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_base_and_derived&lt; udt2, r1&gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; r2, udt1&gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; r3, udt1 &gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_base_and_derived&lt; udt1, r4 &gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_base_and_derived&lt; udt2, r4 &gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; r5, <a href="./empty-base.html" class="identifier">empty_base</a> > ));
</pre>
</div>
<div class="section" id="id1171">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference internal" href="./metafunctions.html">Metafunctions</a>, <a class="reference internal" href="./empty-base.html">empty_base</a>, <a class="reference internal" href="./inherit-linearly.html">inherit_linearly</a>, <a class="reference internal" href="./identity.html">identity</a></p>
<!-- Metafunctions/Miscellaneous//inherit_linearly |40 -->
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