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7 | <title>The MPL Reference Manual: BOOST_MPL_LIMIT_METAFUNCTION_ARITY</title> | |
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10 | <body class="docframe refmanual"> | |
11 | <table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./cfg-no-has-xxx-template.html" class="navigation-link">Prev</a> <a href="./limit-vector-size.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./cfg-no-has-xxx-template.html" class="navigation-link">Back</a> <a href="./limit-vector-size.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./configuration.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </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="./macros.html" class="navigation-link">Macros</a> / <a href="./configuration.html" class="navigation-link">Configuration</a> / <a href="./limit-metafunction-arity.html" class="navigation-link">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</a></td> | |
13 | </tr></table><div class="header-separator"></div> | |
14 | <div class="section" id="boost-mpl-limit-metafunction-arity"> | |
15 | <h1><a class="toc-backref" href="./configuration.html#id1601">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</a></h1> | |
16 | <div class="section" id="id1353"> | |
17 | <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> | |
18 | <pre class="literal-block"> | |
19 | #if !defined(<a href="./limit-metafunction-arity.html" class="identifier">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</a>) | |
20 | # define <a href="./limit-metafunction-arity.html" class="identifier">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</a> \ | |
21 | <em>implementation-defined integral constant</em> \ | |
22 | /**/ | |
23 | #endif | |
24 | </pre> | |
25 | </div> | |
26 | <div class="section" id="id1354"> | |
27 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
28 | <p><tt class="literal"><span class="pre"><a href="./limit-metafunction-arity.html" class="identifier">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</a></span></tt> is an overridable configuration macro | |
29 | regulating the maximum supported arity of <a class="reference internal" href="./metafunction.html">metafunctions</a> and | |
30 | <a class="reference internal" href="./metafunction-class.html">metafunction classes</a>. In this implementation of the | |
31 | library, <tt class="literal"><span class="pre"><a href="./limit-metafunction-arity.html" class="identifier">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</a></span></tt> has a default value of 5. To | |
32 | override the default limit, define <tt class="literal"><span class="pre"><a href="./limit-metafunction-arity.html" class="identifier">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</a></span></tt> to | |
33 | the desired maximum arity before including any library header. | |
34 | [<em>Note:</em> Overriding will take effect | |
35 | <em>only</em> if the library is configured not to use <a class="reference internal" href="./cfg-no-preprocessed-headers.html#boost-mpl-cfg-no-preprocessed">preprocessed headers</a>. See | |
36 | <a class="reference internal" href="./cfg-no-preprocessed-headers.html">BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS</a> for more information. — <em>end note</em>]</p> | |
37 | </div> | |
38 | <div class="section" id="id1357"> | |
39 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> | |
40 | <pre class="literal-block"> | |
41 | #define <a href="./cfg-no-preprocessed-headers.html" class="identifier">BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS</a> | |
42 | #define <a href="./limit-metafunction-arity.html" class="identifier">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</a> 2 | |
43 | <tt class="literal"><span class="pre">#</span></tt>include <boost/mpl/<a href="./apply.html" class="identifier">apply</a>.hpp> | |
44 | ||
45 | using namespace boost::mpl; | |
46 | ||
47 | template< typename T1, typename T2 > struct second | |
48 | { | |
49 | typedef T2 type; | |
50 | }; | |
51 | ||
52 | template< typename T1, typename T2, typename T3 > struct third | |
53 | { | |
54 | typedef T3 type; | |
55 | }; | |
56 | ||
57 | typedef <a href="./apply.html" class="identifier">apply</a>< second<<a href="./placeholders.html" class="identifier">_1</a>,_2_>,int,long >::type r1; | |
58 | // typedef <a href="./apply.html" class="identifier">apply</a>< third<<a href="./placeholders.html" class="identifier">_1</a>,_2_,<a href="./placeholders.html" class="identifier">_3</a>>,int,long,float >::type r2; // error! | |
59 | </pre> | |
60 | </div> | |
61 | <div class="section" id="id1358"> | |
62 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
63 | <p><a class="reference internal" href="./macros.html">Macros</a>, <a class="reference internal" href="./configuration.html">Configuration</a>, <a class="reference internal" href="./cfg-no-preprocessed-headers.html">BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS</a></p> | |
64 | <!-- Macros/Configuration//BOOST_MPL_LIMIT_VECTOR_SIZE |30 --> | |
65 | </div> | |
66 | </div> | |
67 | ||
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70 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
71 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
72 | 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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