ceph/src/boost/boost/tti/has_member_data.hpp

   1
   2 //  (C) Copyright Edward Diener 2011,2012,2013
   3 //  Use, modification and distribution are subject to the Boost Software License,
   4 //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   5 //  http://www.boost.org/LICENSE_1_0.txt).
   6
   7 #if !defined(BOOST_TTI_HAS_MEMBER_DATA_HPP)
   8 #define BOOST_TTI_HAS_MEMBER_DATA_HPP
   9
  10 #include <boost/config.hpp>
  11 #include <boost/preprocessor/cat.hpp>
  12 #include <boost/tti/detail/ddeftype.hpp>
  13 #include <boost/tti/detail/dmem_data.hpp>
  14 #include <boost/tti/gen/has_member_data_gen.hpp>
  15
  16 /*
  17
  18   The succeeding comments in this file are in doxygen format.
  19
  20 */
  21
  22 /** \file
  23 */
  24
  25 /// A macro which expands to a metafunction which tests whether member data with a particular name and type exists.
  26 /**
  27
  28     BOOST_TTI_TRAIT_HAS_MEMBER_DATA is a macro which expands to a metafunction.
  29     The metafunction tests whether member data with a particular
  30     name and type exists. The macro takes the form of BOOST_TTI_TRAIT_HAS_MEMBER_DATA(trait,name) where
  31
  32     trait = the name of the metafunction. <br/>
  33     name  = the name of the inner member data.
  34
  35     BOOST_TTI_TRAIT_HAS_MEMBER_DATA generates a metafunction called "trait" where 'trait' is the macro parameter.
  36
  37   @code
  38
  39               template<class BOOST_TTI_TP_ET,class BOOST_TTI_TP_TYPE>
  40               struct trait
  41                 {
  42                 static const value = unspecified;
  43                 typedef mpl::bool_<true-or-false> type;
  44                 };
  45
  46               The metafunction types and return:
  47
  48                 BOOST_TTI_TP_ET   = the enclosing type in which to look for our 'name'
  49                                     The enclosing type can be a class, struct, or union.
  50                                                          OR
  51                                     The type of the member data in the form of a pointer
  52                                     to member data.
  53
  54                 BOOST_TTI_TP_TYPE = (optional) The type of the member data if the first
  55                                     parameter is the enclosing type.
  56
  57                 returns  = 'value' is true if the 'name' exists, with the correct data type,
  58                            otherwise 'value' is false.
  59
  60   @endcode
  61
  62 */
  63 #define BOOST_TTI_TRAIT_HAS_MEMBER_DATA(trait,name) \
  64   BOOST_TTI_DETAIL_TRAIT_HAS_MEMBER_DATA(trait,name) \
  65   template<class BOOST_TTI_TP_ET,class BOOST_TTI_TP_TYPE = BOOST_TTI_NAMESPACE::detail::deftype> \
  66   struct trait \
  67     { \
  68     typedef typename \
  69     BOOST_PP_CAT(trait,_detail_hmd) \
  70         < \
  71         BOOST_TTI_TP_ET, \
  72         BOOST_TTI_TP_TYPE \
  73         >::type type; \
  74     BOOST_STATIC_CONSTANT(bool,value=type::value); \
  75     }; \
  76 /**/
  77
  78 /// A macro which expands to a metafunction which tests whether a member data with a particular name and type exists.
  79 /**
  80
  81     BOOST_TTI_HAS_MEMBER_DATA is a macro which expands to a metafunction.
  82     The metafunction tests whether member data with a particular
  83     name and type exists. The macro takes the form of BOOST_TTI_HAS_MEMBER_DATA(name) where
  84
  85     name  = the name of the inner member.
  86
  87     BOOST_TTI_HAS_MEMBER_DATA generates a metafunction called "has_member_data_name" where 'name' is the macro parameter.
  88
  89   @code
  90
  91               template<class BOOST_TTI_TP_ET,class BOOST_TTI_TP_TYPE>
  92               struct has_member_data_'name'
  93                 {
  94                 static const value = unspecified;
  95                 typedef mpl::bool_<true-or-false> type;
  96                 };
  97
  98               The metafunction types and return:
  99
 100                 BOOST_TTI_TP_ET   = the enclosing type in which to look for our 'name'.
 101                                     The enclosing type can be a class, struct, or union.
 102                                                          OR
 103                                     The type of the member data in the form of a pointer
 104                                     to member data.
 105
 106                 BOOST_TTI_TP_TYPE = (optional) The type of the member data if the first
 107                                     parameter is the enclosing type.
 108
 109                 returns  = 'value' is true if the 'name' exists, with the correct data type,
 110                            otherwise 'value' is false.
 111
 112   @endcode
 113
 114 */
 115 #define BOOST_TTI_HAS_MEMBER_DATA(name) \
 116   BOOST_TTI_TRAIT_HAS_MEMBER_DATA \
 117   ( \
 118   BOOST_TTI_HAS_MEMBER_DATA_GEN(name), \
 119   name \
 120   ) \
 121 /**/
 122
 123 #endif // BOOST_TTI_HAS_MEMBER_DATA_HPP