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## Macro BOOST_TTI_HAS_STATIC_MEMBER_DATA

BOOST_TTI_HAS_STATIC_MEMBER_DATA — A macro which expands to a metafunction which tests whether a static member data with a particular name and type exists.

## Synopsis

    // In header: <boost/tti/has_static_member_data.hpp>

    BOOST_TTI_HAS_STATIC_MEMBER_DATA(name)

## Description

BOOST_TTI_HAS_STATIC_MEMBER_DATA is a macro which expands to a metafunction. The metafunction tests whether static member data with a particular name and type exists. The macro takes the form of BOOST_TTI_HAS_STATIC_MEMBER_DATA(name) where

name = the name of the inner member.

BOOST_TTI_HAS_STATIC_MEMBER_DATA generates a metafunction called "has_static_member_data_name" where 'name' is the macro parameter.

    template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_TYPE>
    struct has_static_member_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.
                          The enclosing type can be a class, struct, or union.
                          If the type is a union, static member data can only
                          be found if the C++11 unrestricted union is implemented
                          by the compiler being used, since prior to C++11 a union
                          could not have static data members.

      BOOST_TTI_TP_TYPE = the type of the static member data.

      returns = 'value' is true if the 'name' exists,
                with the appropriate BOOST_TTI_TP_TYPE type,
                within the enclosing BOOST_TTI_TP_T type,
                otherwise 'value' is false.