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

Subject: [Boost-users] Is there a portable way to determine whether a type is functor ?
From: ancode tran (ancodecpp_at_[hidden])
Date: 2008-12-26 16:36:50

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  
       
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