How to automatically convert strongly typed enum into int?

by 
#include <iostream>

struct a {
  enum LOCAL_A { A1, A2 };
};
enum class b { B1, B2 };

int foo(int input) { return input; }

int main(void) {
  std::cout << foo(a::A1) << std::endl;
  std::cout << foo(static_cast<int>(b::B2)) << std::endl;
}

The a::LOCAL_A is what the strongly typed enum is trying to achieve, but there is a small difference : normal enums can be converted into integer type, while strongly typed enums can not do it without a cast.

So, is there a way to convert a strongly typed enum value into an integer type without a cast? If yes, how?

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