Question

I’m using gcc, which implements enums as 32 bit integers on the architecture I have (don’t know in general). If I try to assign an enum value too large, I get

warning: integer overflow in expression

Is there a way to make gcc use 64 bit integers as the underlying integer type? A gcc specific way is fine, although if there’s a portable way, that’s even better.

** Edit **
This is a related post: 64 bit enum in C++?

Unlike that question, I’m also interested in gnu extensions.

Answer 1

The following works for me with -std=c++0x, but not with -std=c++98 though

enum EnumFoo {
    FooSomething = 0x123456789ULL
};

I tested this with

$ g++ --version
g++ (Ubuntu 4.4.3-4ubuntu5) 4.4.3