Initialize enum value with function call

Question

Is there any way to initialize enum value like this:

enum Test
{
    X = function("X")
};

Currently in Visual Studio I get this error:

error C2057: expected constant expression

And Visual Studio doesn't support constexpr

Answer 1

The enumerator list within an enum declaration is defined as follows:

enumerator-list - comma-separated list of enumerator definitions, each of which is either simply an identifier, which becomes the name of the enumerator, or an identifier with an initializer: identifier = constexpr

You may only use constant expressions.