c++ enum class integer not working for array subscript

Question

I have the following enum class:

enum class EnumClass : int
{
    A = 0, B
};

Now I want to subscript with that enum type to an array:

MyObject arr[2];
.
.
.
MyObject a = arr[EnumClass::A]
MyObject b = arr[EnumClass::B]

Unfortunately I get the following error message:

array subscript is not an integer

As enum classes are strongly typed I would expect this to work.

Answer 1

As enum classes are strongly typed I would expect this to work

On the contrary, that's exactly why it won't work. Scoped enumerations will not implicitly convert to the underlying type. Use static_cast instead.

MyObject a = arr[static_cast<int>(EnumClass::A)];