How to write a type trait `is_container` or `is_vector`?

Question

Is it possible to write a type trait whose value is true for all common STL structures (e.g., vector, set, map, ...)?

To get s

Answer 1

While the other answers here that try to guess whether a class is a container or not might work for you, I would like to present you with the alternative of naming the type you want to return true for. You can use this to build arbitrary is_(something) traits types.

template struct is_container : public std::false_type {};

template 
struct is_container> : public std::true_type {};

template 
struct is_container> : public std::true_type {};

And so on.

You will need to include and whatever classes you add to your rules.