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+
+// (C) Copyright Edward Diener 2012,2013
+// Use, modification and distribution are subject to the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt).
+
+#if !defined(BOOST_TTI_HAS_DATA_HPP)
+#define BOOST_TTI_HAS_DATA_HPP
+
+#include <boost/config.hpp>
+#include <boost/preprocessor/cat.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <boost/tti/gen/has_data_gen.hpp>
+#include <boost/tti/detail/ddata.hpp>
+
+/*
+
+ The succeeding comments in this file are in doxygen format.
+
+*/
+
+/** \file
+*/
+
+/// Expands to a metafunction which tests whether member data or static member with a particular name and type exists.
+/**
+
+ trait = the name of the metafunction.
+
+ name = the name of the inner member to introspect.
+
+ generates a metafunction called "trait" where 'trait' is the macro parameter.
+
+ template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_TYPE>
+ struct trait
+ {
+ static const value = unspecified;
+ typedef mpl::bool_<true-or-false> type;
+ };
+
+ The metafunction types and return:
+
+ BOOST_TTI_TP_T = the enclosing type in which to look for our 'name'
+
+ BOOST_TTI_TP_TYPE = The type of the member data or static member.
+
+ returns = 'value' is true if the 'name' exists, with the correct data type,
+ otherwise 'value' is false.
+
+*/
+#define BOOST_TTI_TRAIT_HAS_DATA(trait,name) \
+ BOOST_TTI_DETAIL_TRAIT_HAS_DATA(trait,name) \
+ template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_TYPE> \
+ struct trait \
+ { \
+ typedef typename \
+ BOOST_PP_CAT(trait,_detail_hd) \
+ < \
+ typename boost::remove_const<BOOST_TTI_TP_T>::type, \
+ BOOST_TTI_TP_TYPE \
+ >::type type; \
+ BOOST_STATIC_CONSTANT(bool,value=type::value); \
+ }; \
+/**/
+
+/// Expands to a metafunction which tests whether member data or static member data with a particular name and type exists.
+/**
+
+ name = the name of the inner member.
+
+ generates a metafunction called "has_data_name" where 'name' is the macro parameter.
+
+ template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_TYPE>
+ struct has_data_name
+ {
+ static const value = unspecified;
+ typedef mpl::bool_<true-or-false> type;
+ };
+
+ The metafunction types and return:
+
+ BOOST_TTI_TP_T = the enclosing type in which to look for our 'name'
+
+ BOOST_TTI_TP_TYPE = The type of the member data or static member.
+
+ returns = 'value' is true if the 'name' exists, with the correct data type,
+ otherwise 'value' is false.
+
+*/
+#define BOOST_TTI_HAS_DATA(name) \
+ BOOST_TTI_TRAIT_HAS_DATA \
+ ( \
+ BOOST_TTI_HAS_DATA_GEN(name), \
+ name \
+ ) \
+/**/
+
+#endif // BOOST_TTI_HAS_DATA_HPP