|
Home | Libraries | People | FAQ | More |
BOOST_TTI_TRAIT_HAS_MEMBER_FUNCTION — Expands to a metafunction which tests whether a member function with a particular name and signature exists.
// In header: <boost/tti/has_member_function.hpp>
BOOST_TTI_TRAIT_HAS_MEMBER_FUNCTION(trait, name)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_R,class BOOST_TTI_FS,class BOOST_TTI_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'
OR
a pointer to member function as a single type.
BOOST_TTI_TP_R = (optional) the return type of the member function
if the first parameter is the enclosing type.
BOOST_TTI_TP_FS = (optional) the parameters of the member function as a boost::mpl forward sequence
if the first parameter is the enclosing type and the member function parameters
are not empty.
BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the member function
if the first parameter is the enclosing type and a tag is needed.
returns = 'value' is true if the 'name' exists,
with the appropriate member function type,
otherwise 'value' is false.