Enum C++ Get by Index

Question

I was wondering in C++ if I have an enum can I access the value at the second index? For example I have

enum Test{hi, bye};

if I want 'hi', can I do something like Test[0], thanks.

Answer 1

Yes and no. If your Enum does not have explicit values then it is possible. Without an explicit values, enum values are given numeric values 0-N in order of declaration. For example ...

enum Test {
  hi, // 0
  bye // 1
}

This means that indexes just translates into a literal value.

Test EnumOfIndex(int i) { return static_cast<Test>(i); }

This of course does 0 validation at runtime and as soon as you add an explicit value it will break down. But it will work in the default scenario.