Is there a way to create operator/function overload for container type

I have some class like:

class A {
A& operator=(const A& a);
A& operator=(const int a);
A& operator=(const std::string a);
};

I made type trait for iterable is_iterable; How to implement overload for operator= for iterable types?

My approach:

template<typename TContainer, std::enable_if_t<is_iterable<TContainer>::value>>
A& operator=(const TContainer& val) {
// do stuff
}

but it doesn't work causing no viable overload error when i try to feed std::list or std::vector.

So, how to fix it and is it possible to use that kind of overload?