How to Define a generic class with one parameter with conditions on the parameter using c++

Question

I am trying to create a class with type parameter, and I want to assign the parameter only if it overrides the "==" operator.

something like this:

template <class T where T is override the operator "==" >
class Dictionary {
private:
    .
    .
    .

public:
    .
    .
    .
};

The idea is to make the compiler to not allow any class that is not overrides the specific operator, as a T type.

I could't find the answer here: How to check whether operator== exists?

Thanks for helpers!