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BOOST_TTI_HAS_MEMBER_DATA — A macro which expands to a metafunction which tests whether a member data with a particular name and type exists.
// In header: <boost/tti/has_member_data.hpp>
BOOST_TTI_HAS_MEMBER_DATA(name)
BOOST_TTI_HAS_MEMBER_DATA is a macro which expands to a metafunction. The metafunction tests whether member data with a particular name and type exists. The macro takes the form of BOOST_TTI_HAS_MEMBER_DATA(name) where
name = the name of the inner member.
BOOST_TTI_HAS_MEMBER_DATA generates a metafunction called "has_member_data_name" where 'name' is the macro parameter.
template<class BOOST_TTI_TP_ET,class BOOST_TTI_TP_TYPE> struct has_member_data_'name' { static const value = unspecified; typedef mpl::bool_<true-or-false> type; }; The metafunction types and return: BOOST_TTI_TP_ET = the enclosing type in which to look for our 'name'. The enclosing type can be a class, struct, or union. OR The type of the member data in the form of a pointer to member data. BOOST_TTI_TP_TYPE = (optional) The type of the member data if the first parameter is the enclosing type. returns = 'value' is true if the 'name' exists, with the correct data type, otherwise 'value' is false.