I was looking through clang's C++ standard library, and found this class in the shared_ptr class.
class shared_ptr
// ...
private:
struct __nat {int __for_bool_;};
// ...
};
I understand that this class is used to detect whether type conversion is possible at compile time, but its member __for_bool_ is never used anywhere in the class or the weak_ptr counterpart. So, my question is, what is the point of __for_bool_? Why not simply use an empty class for the same purpose?
I'm sure the standard library authors definitely know better than me.
