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 /// Expands to a metafunction which tests whether a member data with a particular name and type exists.
  26 /**
  27
  28     trait = the name of the metafunction.
  29
  30     name  = the name of the inner member to introspect.
  31
  32     generates a metafunction called "trait" where 'trait' is the macro parameter.
  33
  34               template<class BOOST_TTI_TP_ET,class BOOST_TTI_TP_TYPE>
  35               struct trait
  36                 {
  37                 static const value = unspecified;
  38                 typedef mpl::bool_<true-or-false> type;
  39                 };
  40
  41               The metafunction types and return:
  42
  43                 BOOST_TTI_TP_ET   = the enclosing type in which to look for our 'name'
  44                                                          OR
  45                                     The type of the member data in the form of a pointer
  46                                     to member data.
  47
  48                 BOOST_TTI_TP_TYPE = (optional) The type of the member data if the first
  49                                     parameter is the enclosing type.
  50
  51                 returns  = 'value' is true if the 'name' exists, with the correct data type,
  52                            otherwise 'value' is false.
  53
  54 */
  55 #define BOOST_TTI_TRAIT_HAS_MEMBER_DATA(trait,name) \
  56   BOOST_TTI_DETAIL_TRAIT_HAS_MEMBER_DATA(trait,name) \
  57   template<class BOOST_TTI_TP_ET,class BOOST_TTI_TP_TYPE = BOOST_TTI_NAMESPACE::detail::deftype> \
  58   struct trait \
  59     { \
  60     typedef typename \
  61     BOOST_PP_CAT(trait,_detail_hmd) \
  62         < \
  63         BOOST_TTI_TP_ET, \
  64         BOOST_TTI_TP_TYPE \
  65         >::type type; \
  66     BOOST_STATIC_CONSTANT(bool,value=type::value); \
  67     }; \
  68 /**/
  69
  70 /// Expands to a metafunction which tests whether a member data with a particular name and type exists.
  71 /**
  72
  73     name  = the name of the inner member.
  74
  75     generates a metafunction called "has_member_data_name" where 'name' is the macro parameter.
  76
  77               template<class BOOST_TTI_TP_ET,class BOOST_TTI_TP_TYPE>
  78               struct has_member_data_name
  79                 {
  80                 static const value = unspecified;
  81                 typedef mpl::bool_<true-or-false> type;
  82                 };
  83
  84               The metafunction types and return:
  85
  86                 BOOST_TTI_TP_ET   = the enclosing type in which to look for our 'name'
  87                                                          OR
  88                                     The type of the member data in the form of a pointer
  89                                     to member data.
  90
  91                 BOOST_TTI_TP_TYPE = (optional) The type of the member data if the first
  92                                     parameter is the enclosing type.
  93
  94                 returns  = 'value' is true if the 'name' exists, with the correct data type,
  95                            otherwise 'value' is false.
  96
  97 */
  98 #define BOOST_TTI_HAS_MEMBER_DATA(name) \
  99   BOOST_TTI_TRAIT_HAS_MEMBER_DATA \
 100   ( \
 101   BOOST_TTI_HAS_MEMBER_DATA_GEN(name), \
 102   name \
 103   ) \
 104 /**/
 105
 106 #endif // BOOST_TTI_HAS_MEMBER_DATA_HPP