has_function.hpp File Reference

#include <boost/config.hpp>
#include <boost/function_types/property_tags.hpp>
#include <boost/mpl/vector.hpp>
#include <boost/preprocessor/cat.hpp>
#include <boost/tti/detail/dfunction.hpp>
#include <boost/tti/gen/has_function_gen.hpp>

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Macros
#define	BOOST_TTI_TRAIT_HAS_FUNCTION(trait, name)
	Expands to a metafunction which tests whether a member function or a static member function with a particular name and signature exists. More...
#define	BOOST_TTI_HAS_FUNCTION(name)
	Expands to a metafunction which tests whether a member function or a static member function with a particular name and signature exists. More...

Macro Definition Documentation

#define BOOST_TTI_HAS_FUNCTION

(

name

)

Value:

BOOST_TTI_TRAIT_HAS_FUNCTION \
  ( \
  BOOST_TTI_HAS_FUNCTION_GEN(name), \
  name \
  ) \

Expands to a metafunction which tests whether a member function or a static member function with a particular name and signature exists.

name = the name of the inner member.

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

      template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_R,class BOOST_TTI_TP_FS,class BOOST_TTI_TP_TAG>
      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_R   = the return type of the function

        BOOST_TTI_TP_FS  = (optional) the parameters of the function as a boost::mpl forward sequence
                  if function parameters are not empty.

        BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the function
                  if the need for a tag exists.

        returns = 'value' is true if the 'name' exists, 
                  with the appropriate function type,
                  otherwise 'value' is false.

#define BOOST_TTI_TRAIT_HAS_FUNCTION	(		trait,
			name
	)

Value:

BOOST_TTI_DETAIL_TRAIT_HAS_FUNCTION(trait,name) \
  template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_R,class BOOST_TTI_TP_FS = boost::mpl::vector<>,class BOOST_TTI_TP_TAG = boost::function_types::null_tag> \
  struct trait \
    { \
    typedef typename \
    BOOST_PP_CAT(trait,_detail_hf)<BOOST_TTI_TP_T,BOOST_TTI_TP_R,BOOST_TTI_TP_FS,BOOST_TTI_TP_TAG>::type type; \
    BOOST_STATIC_CONSTANT(bool,value=type::value); \
    }; \

Expands to a metafunction which tests whether a member function or a static member function with a particular name and signature exists.

trait = the name of the metafunction within the tti namespace.

name = the name of the inner member.

generates a metafunction called "trait" where 'trait' is the macro parameter.

      template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_R,class BOOST_TTI_TP_FS,class BOOST_TTI_TP_TAG>
      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_R   = the return type of the function

        BOOST_TTI_TP_FS  = (optional) the parameters of the function as a boost::mpl forward sequence
                  if function parameters are not empty.

        BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the function
                  if the need for a tag exists.

        returns = 'value' is true if the 'name' exists, 
                  with the appropriate static member function type,
                  otherwise 'value' is false.