C++11 Fun with initializer lists, arrays, and enumerations

Question

Background

C++11 initializer lists can be used to initialize vectors and arrays with argument passing to constructors.

I have a piece of code below

Answer 1

I don't think you can do this with initializer lists. This isn't the sort of thing they're meant for. I think you could manage a decent workaround by defining an iterator that would iterate over any enumeration that had a First and Last member.

But first, your definition of Size isn't quite right...

template< typename E >
constexpr size_t Size()
{
    return (size_t)(E::Last) - (size_t)(E::First) + 1;
}

Declaring it constexpr means that it's definition is a compile time constant. So you can use it in template arguments and the like.

I don't have time right now to create the range class for you. It's somewhat complicated by the fact that enum values and integers are not interchangeable for enum classes. But it's not too hard. You might use this question "Is there a range class in C++0x (aka C++11) for use with range based for loops?" as a starting point. You basically use the vector initializer that initializes from a [begin, end) pair in conjuction with a range class like is discussed in that question.