Description

BOOST_TTI_HAS_FUNCTION is a macro which expands to a metafunction. The metafunction tests whether a member function or a static member function with a particular name and signature exists. The macro takes the form of BOOST_TTI_HAS_FUNCTION(name) where

name = the name of the inner member.

BOOST_TTI_HAS_FUNCTION 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 has_function_'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'.
                     The enclosing type can be a class, struct, or union.
  
  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.