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## Macro BOOST_TTI_TRAIT_HAS_FUNCTION

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

## Synopsis

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

    BOOST_TTI_TRAIT_HAS_FUNCTION(trait, name)

## Description

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.