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7 | <title>The MPL Reference Manual: BOOST_MPL_AUX_LAMBDA_SUPPORT</title> |
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13 | </tr></table><div class="header-separator"></div> |
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14 | <div class="section" id="aux-lambda-support"> |
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15 | <h1><a class="toc-backref" href="./broken-compiler.html#id528" name="aux-lambda-support">BOOST_MPL_AUX_LAMBDA_SUPPORT</a></h1> |
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16 | <div class="section" id="aux-synopsis"> |
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17 | <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> |
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18 | <pre class="literal-block"> |
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19 | #define <a href="./aux-lambda-support.html" class="identifier">BOOST_MPL_AUX_LAMBDA_SUPPORT</a>(arity, fun, params) \ |
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20 | <em>unspecified token sequence</em> \ |
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21 | /**/ |
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22 | </pre> |
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23 | </div> |
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24 | <div class="section" id="aux-description"> |
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25 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> |
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26 | <p>Enables metafunction <tt class="literal"><span class="pre">fun</span></tt> for the use in <a class="reference" href="./lambda-expression.html">Lambda Expression</a>s on |
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27 | compilers that don't support partial template specialization or/and |
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28 | template template parameters. Expands to nothing on conforming compilers.</p> |
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29 | </div> |
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30 | <div class="section" id="aux-header"> |
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31 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> |
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32 | <pre class="literal-block"> |
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33 | #include <<a href="../../../../boost/mpl/aux_/lambda_support.hpp" class="header">boost/mpl/aux_/lambda_support.hpp</a>> |
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34 | </pre> |
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35 | </div> |
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36 | <div class="section" id="aux-parameters"> |
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37 | <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> |
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38 | <table border="1" class="table"> |
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39 | <colgroup> |
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40 | <col width="15%" /> |
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41 | <col width="32%" /> |
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42 | <col width="53%" /> |
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43 | </colgroup> |
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44 | <thead valign="bottom"> |
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45 | <tr><th>Parameter</th> |
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46 | <th>Requirement</th> |
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47 | <th>Description</th> |
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48 | </tr> |
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49 | </thead> |
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50 | <tbody valign="top"> |
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51 | <tr><td><tt class="literal"><span class="pre">arity</span></tt></td> |
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52 | <td>An integral constant</td> |
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53 | <td>The metafunction's arity, i.e. the number of its |
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54 | template parameters, including the defaults.</td> |
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55 | </tr> |
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56 | <tr><td><tt class="literal"><span class="pre">fun</span></tt></td> |
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57 | <td>A legal identifier token</td> |
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58 | <td>The metafunction's name.</td> |
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59 | </tr> |
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60 | <tr><td><tt class="literal"><span class="pre">params</span></tt></td> |
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61 | <td>A <a class="reference" href="http://www.boost.org/libs/preprocessor/doc/data/tuples.html" target="_top">PP-tuple</a></td> |
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62 | <td>A tuple of the metafunction's parameter names, in |
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63 | their original order, including the defaults.</td> |
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64 | </tr> |
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65 | </tbody> |
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66 | </table> |
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67 | </div> |
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68 | <div class="section" id="aux-expression-semantics"> |
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69 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> |
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70 | <p>For any integral constant <tt class="literal"><span class="pre">n</span></tt>, a <a class="reference" 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> |
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71 | <pre class="literal-block"> |
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72 | template< typename A1,<em>...</em> typename A<em>n</em> > struct fun |
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73 | { |
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74 | // <em>...</em> |
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75 | |
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76 | <a href="./aux-lambda-support.html" class="identifier">BOOST_MPL_AUX_LAMBDA_SUPPORT</a>(n, fun, (A1,<em>...</em>A<em>n</em>)) |
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77 | }; |
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78 | </pre> |
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79 | <table class="field-list" frame="void" rules="none"> |
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80 | <col class="field-name" /> |
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81 | <col class="field-body" /> |
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82 | <tbody valign="top"> |
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83 | <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 |
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84 | bracket (<tt class="literal"><span class="pre">}</span></tt>).</td> |
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85 | </tr> |
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86 | <tr class="field"><th class="field-name">Return type:</th><td class="field-body">None.</td> |
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87 | </tr> |
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88 | <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 |
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89 | don't support partial template specialization or/and template template parameters |
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90 | expands to an unspecified token sequence enabling <tt class="literal"><span class="pre">fun</span></tt> to participate in |
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91 | <a class="reference" href="./lambda-expression.html">Lambda Expression</a>s with the semantics described in this manual.</td> |
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92 | </tr> |
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93 | </tbody> |
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94 | </table> |
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95 | </div> |
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96 | <div class="section" id="aux-example"> |
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97 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> |
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98 | <pre class="literal-block"> |
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99 | template< typename T, typename U = int > struct f |
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100 | { |
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101 | typedef T type[sizeof(U)]; |
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102 | |
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103 | <a href="./aux-lambda-support.html" class="identifier">BOOST_MPL_AUX_LAMBDA_SUPPORT</a>(2, f, (T,U)) |
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104 | }; |
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105 | |
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106 | typedef <a href="./apply.html" class="identifier">apply</a><tt class="literal"><span class="pre">1</span></tt>< f<char,_1>,long >::type r; |
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107 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< r, char[sizeof(long)] > )); |
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108 | </pre> |
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109 | </div> |
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110 | <div class="section" id="aux-see-also"> |
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111 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> |
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112 | <p><a class="reference" href="./macros.html">Macros</a>, <a class="reference" href="./metafunctions.html">Metafunctions</a>, <a class="reference" href="./lambda-expression.html">Lambda Expression</a></p> |
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113 | <!-- modtime: November 10, 2004 04:45:01 +0000 --> |
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