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| <title>The MPL Reference Manual: BOOST_MPL_AUX_LAMBDA_SUPPORT</title> |
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| <div class="section" id="boost-mpl-aux-lambda-support"> |
| <h1><a class="toc-backref" href="./broken-compiler-workarounds.html#id1609">BOOST_MPL_AUX_LAMBDA_SUPPORT</a></h1> |
| <div class="section" id="id1384"> |
| <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> |
| <pre class="literal-block"> |
| #define <a href="./aux-lambda-support.html" class="identifier">BOOST_MPL_AUX_LAMBDA_SUPPORT</a>(arity, fun, params) \ |
| <em>unspecified token sequence</em> \ |
| /**/ |
| </pre> |
| </div> |
| <div class="section" id="id1385"> |
| <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> |
| <p>Enables metafunction <tt class="literal"><span class="pre">fun</span></tt> for the use in <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a>s on |
| compilers that don't support partial template specialization or/and |
| template template parameters. Expands to nothing on conforming compilers.</p> |
| </div> |
| <div class="section" id="id1386"> |
| <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> |
| <pre class="literal-block"> |
| #include <<a href="../../../../boost/mpl/aux_/lambda_support.hpp" class="header">boost/mpl/aux_/lambda_support.hpp</a>> |
| </pre> |
| </div> |
| <div class="section" id="id1387"> |
| <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> |
| <table border="1" class="docutils table"> |
| <colgroup> |
| <col width="15%" /> |
| <col width="32%" /> |
| <col width="53%" /> |
| </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">arity</span></tt></td> |
| <td>An integral constant</td> |
| <td>The metafunction's arity, i.e. the number of its |
| template parameters, including the defaults.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre">fun</span></tt></td> |
| <td>A legal identifier token</td> |
| <td>The metafunction's name.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre">params</span></tt></td> |
| <td>A <a class="reference external" href="http://www.boost.org/libs/preprocessor/doc/data/tuples.html" target="_top">PP-tuple</a></td> |
| <td>A tuple of the metafunction's parameter names, in |
| their original order, including the defaults.</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="id1388"> |
| <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> |
| <p>For any integral constant <tt class="literal"><span class="pre">n</span></tt>, a <a class="reference internal" href="./metafunction.html">Metafunction</a> <tt class="literal"><span class="pre">fun</span></tt>, and arbitrary types <tt class="literal"><span class="pre">A1</span></tt>,... <tt class="literal"><span class="pre">An</span></tt>:</p> |
| <pre class="literal-block"> |
| template< typename A1,<em>...</em> typename A<em>n</em> > struct fun |
| { |
| // <em>...</em> |
| |
| <a href="./aux-lambda-support.html" class="identifier">BOOST_MPL_AUX_LAMBDA_SUPPORT</a>(n, fun, (A1,<em>...</em>A<em>n</em>)) |
| }; |
| </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">Appears in <tt class="literal"><span class="pre">fun</span></tt>'s scope, immediately followed by the scope-closing |
| bracket (<tt class="literal"><span class="pre">}</span></tt>).</td> |
| </tr> |
| <tr class="field"><th class="field-name">Return type:</th><td class="field-body">None.</td> |
| </tr> |
| <tr class="field"><th class="field-name">Semantics:</th><td class="field-body">Expands to nothing and has no effect on conforming compilers. On compilers that |
| don't support partial template specialization or/and template template parameters |
| expands to an unspecified token sequence enabling <tt class="literal"><span class="pre">fun</span></tt> to participate in |
| <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a>s with the semantics described in this manual.</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="id1389"> |
| <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> |
| <pre class="literal-block"> |
| template< typename T, typename U = int > struct f |
| { |
| typedef T type[sizeof(U)]; |
| |
| <a href="./aux-lambda-support.html" class="identifier">BOOST_MPL_AUX_LAMBDA_SUPPORT</a>(2, f, (T,U)) |
| }; |
| |
| typedef <a href="./apply.html" class="identifier">apply</a><tt class="literal"><span class="pre">1</span></tt>< f<char,<a href="./placeholders.html" class="identifier">_1</a>>,long >::type r; |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< r, char[sizeof(long)] > )); |
| </pre> |
| </div> |
| <div class="section" id="id1390"> |
| <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> |
| <p><a class="reference internal" href="./macros.html">Macros</a>, <a class="reference internal" href="./metafunctions.html">Metafunctions</a>, <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></p> |
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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 |
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