Possible to use type_traits / SFINAE to find if a class defines a member TYPE?

Question

I have seen this question which allows one to check for the existence of a member function, but I\'m trying to find out whether a class has a member

Answer 1

Try this

template
struct Void {
  typedef void type;
};

template
struct has_bar {
    enum { value = 0 };
};

template
struct has_bar::type > {
    enum { value = 1 };
};