[Boost-users] Is there a portable way to determine whether a type is functor ?

Hi all, The following code only works under g++ 4.x: #include <boost/type_traits.hpp> template <class T> struct is_functor_helper { static boost::type_traits::no_type test (...); template <class U> static boost::type_traits::yes_type test (U*, typeof(&U::operator()) dummy = NULL); BOOST_STATIC_CONSTANT (bool, value = sizeof(test((T*)NULL)) == sizeof(boost::type_traits::yes_type)); }; template <class T> struct is_functor: public boost::integral_constant<bool, is_functor_helper<T>::value> { }; Can anyone give me a hint to make it work under other toolset, please ? Thanks in advance. Regards, Trung An Tran --------------------------------- Hãy cùng chat với bạn bè trên Yahoo! Pingbox mới toanh! Tạo một không gian riêng để chat trên blog là chuyện nhỏ.