Re: Is a class type using SFINAE

Dear Experts,

I am trying to implement "Is a class type" for template arguments
using SFINAE.

program is like this:

#include<iostream>
using namespace std;
template <typename T>
class IsClass
{
private:
typedef char one;
typedef struct{char a[2];} two;
template<typename C>static one test(int C::*);
template<typename C>static two test(...);
public:
enum { Yes = sizeof(IsClass<T>::test<T>(0)) == 1 };

};

template<typename T>
void check()
{
if (IsClass<T>::Yes) {
       std::cout << " Is Class" << std::endl;
   }
   else {
       std::cout << " Not Class " << std::endl;
   }

}
class ABCD
{
};

int main()
{
cout<<"int";
               check<int>();
cout<<"ABCD";
               check<ABCD>();
}

It does not compile on g++ compiler.

On CC it gives the following output:

int Not Class
ABCD Not Class

But the expected behavior for class ABCD was
ABCD Is Class.

Suggestions would be very helpful.