C++11 is_same type trait for templates

Question

Is it possible to check that type T is an std::array of arbitrary type and size?

I can check for a particular array, for instance:

    is_same<T, std::array<int,5>>::value

But I'd like to check that T is any instantiation of std::array. Something like below (which, of course, does not compile):

    is_same<T, std::array>::value

Is there a way to achieve this (maybe not using is_same)?

Answer 1

You have to write your own, but it's simple:

template<typename> struct is_std_array : std::false_type {};  template<typename T, std::size_t N> struct is_std_array<std::array<T,N>> : std::true_type {};