ceph/src/boost/libs/tti/include/boost/tti/has_static_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_STATIC_MEMBER_DATA_HPP)
   8 #define BOOST_TTI_HAS_STATIC_MEMBER_DATA_HPP
   9
  10 #include <boost/config.hpp>
  11 #include <boost/preprocessor/cat.hpp>
  12 #include <boost/tti/gen/has_static_member_data_gen.hpp>
  13 #include <boost/tti/detail/dstatic_mem_data.hpp>
  14
  15 /*
  16
  17   The succeeding comments in this file are in doxygen format.
  18
  19 */
  20
  21 /** \file
  22 */
  23
  24 /// Expands to a metafunction which tests whether a static member data with a particular name and type exists.
  25 /**
  26
  27     trait = the name of the metafunction within the tti namespace.
  28
  29     name  = the name of the inner member.
  30
  31     generates a metafunction called "trait" where 'trait' is the macro parameter.
  32
  33               The metafunction types and return:
  34
  35                 BOOST_TTI_TP_T    = the enclosing type.
  36
  37                 BOOST_TTI_TP_TYPE = the static member data type,
  38                            in the form of a data type,
  39                            in which to look for our 'name'.
  40
  41                 returns = 'value' is true if the 'name' exists,
  42                           with the BOOST_TTI_TP_TYPE type,
  43                           within the enclosing BOOST_TTI_TP_T type,
  44                           otherwise 'value' is false.
  45
  46 */
  47 #define BOOST_TTI_TRAIT_HAS_STATIC_MEMBER_DATA(trait,name) \
  48   BOOST_TTI_DETAIL_TRAIT_HAS_STATIC_MEMBER_DATA(trait,name) \
  49   template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_TYPE> \
  50   struct trait \
  51     { \
  52     typedef typename \
  53     BOOST_PP_CAT(trait,_detail_hsd)<BOOST_TTI_TP_T,BOOST_TTI_TP_TYPE>::type type; \
  54     BOOST_STATIC_CONSTANT(bool,value=type::value); \
  55     }; \
  56 /**/
  57
  58 /// Expands to a metafunction which tests whether a static member data with a particular name and type exists.
  59 /**
  60
  61     name  = the name of the inner member.
  62
  63     generates a metafunction called "has_static_member_data_name" where 'name' is the macro parameter.
  64
  65               The metafunction types and return:
  66
  67                 BOOST_TTI_TP_T    = the enclosing type.
  68
  69                 BOOST_TTI_TP_TYPE = the static member data type,
  70                            in the form of a data type,
  71                            in which to look for our 'name'.
  72
  73                 returns = 'value' is true if the 'name' exists,
  74                           with the appropriate BOOST_TTI_TP_TYPE type,
  75                           within the enclosing BOOST_TTI_TP_T type,
  76                           otherwise 'value' is false.
  77
  78 */
  79 #define BOOST_TTI_HAS_STATIC_MEMBER_DATA(name) \
  80   BOOST_TTI_TRAIT_HAS_STATIC_MEMBER_DATA \
  81   ( \
  82   BOOST_TTI_HAS_STATIC_MEMBER_DATA_GEN(name), \
  83   name \
  84   ) \
  85 /**/
  86
  87 #endif // BOOST_TTI_HAS_STATIC_MEMBER_DATA_HPP