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| <title>The MPL Reference Manual: inherit</title> |
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| <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.html" class="navigation-link">inherit</a></td> |
| </tr></table><div class="header-separator"></div> |
| <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< |
| typename T1, typename T2 |
| > |
| 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< |
| typename T1, typename T2,<em>...</em> typename T<em>n</em> |
| > |
| struct <a href="./inherit.html" class="identifier">inherit</a><em>n</em> |
| { |
| typedef <em>unspecified</em> type; |
| }; |
| |
| template< |
| typename T1 |
| , typename T2 |
| <em>...</em> |
| , typename T<em>n</em> = <em>unspecified</em> |
| > |
| 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 <<a href="../../../../boost/mpl/inherit.hpp" class="header">boost/mpl/inherit.hpp</a>> |
| </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<t1,t2>::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><t1,t2,<em>...</em>t<em>n</em>>::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>< |
| <a href="./inherit.html" class="identifier">inherit</a><em>n-1</em><t1,t2,<em>...</em>t<em>n-1</em>>::type |
| , t<em>n</em> |
| > |
| { |
| }; |
| </pre> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <!-- ........................................................................... --> |
| <pre class="literal-block"> |
| typedef <a href="./inherit.html" class="identifier">inherit</a><t1,t2,<em>...</em>t<em>n</em>>::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><t1,t2,<em>...</em>t<em>n</em>>::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><udt1,udt2>::type r1; |
| typedef <a href="./inherit.html" class="identifier">inherit</a><<a href="./empty-base.html" class="identifier">empty_base</a>,udt1>::type r2; |
| typedef <a href="./inherit.html" class="identifier">inherit</a><<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>>::type r3; |
| typedef <a href="./inherit.html" class="identifier">inherit</a><udt1,<a href="./empty-base.html" class="identifier">empty_base</a>,udt2>::type r4; |
| typedef <a href="./inherit.html" class="identifier">inherit</a><<a href="./empty-base.html" class="identifier">empty_base</a>,<a href="./empty-base.html" class="identifier">empty_base</a>>::type r5; |
| |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_base_and_derived< udt1, r1> )); |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_base_and_derived< udt2, r1> )); |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< r2, udt1> )); |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< r3, udt1 > )); |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_base_and_derived< udt1, r4 > )); |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_base_and_derived< udt2, r4 > )); |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< 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 --> |
| </div> |
| </div> |
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| <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 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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