How can I output the value of an enum class in C++11

Question

How can I output the value of an enum class in C++11? In C++03 it\'s like this:

#include 

using namespace std;

enum A {
  a =          


        

Answer 1

Unlike an unscoped enumeration, a scoped enumeration is not implicitly convertible to its integer value. You need to explicitly convert it to an integer using a cast:

std::cout << static_cast::type>(a) << std::endl;

You may want to encapsulate the logic into a function template:

template 
auto as_integer(Enumeration const value)
    -> typename std::underlying_type::type
{
    return static_cast::type>(value);
}

used as:

std::cout << as_integer(a) << std::endl;