How do I iterate over enum members at runtime?

[Andrej Mitrovic]

Well, the C code I was translating had something like this:
struct SysMetrics
{
    int iIndex;
    char* szLabel;
    char* szDesc;
}

And then it used an array of these structures. So for all existing
enums that started with "SM_", those fields were populated with the
enum value and a name and description. A 200 line header file was
filled by hand. I really hope the author had some help from an editor
for that, lol!.

I've managed to do the same in about a dozen lines of code, although I
didn't fill the description field (I don't need it anyway):
http://codepad.org/EJEuc6qA

It's a shame that an enum with a tag doesn't have a .length property.
I've had to use __traits to build an array just to get the length.