On Friday, 15 September 2017 at 19:35:50 UTC, nkm1 wrote:
On Friday, 15 September 2017 at 19:21:02 UTC, Timothy Foster
wrote:
I believe C enum size is implementation defined. A C compiler
can pick the underlying type (1, 2, or 4 bytes, signed or
unsigned) that fits the values in the enum.
No, at least, not C99. See 6.4.4.3: "An identifier declared as
an enumeration constant has type int". You must be thinking
about C++.
You are correct, however 6.7.2.2 "Enumeration specifiers" states:
"Each enumerated type shall be compatible with char, a signed
integer type, or an unsigned integer type. The choice of type is
implementation-defined, but shall be capable of representing the
values of all the members of the enumeration."
I believe that means that if you have the following:
enum ABC { A, B, C }
Then A, B, and C are by themselves ints, but the enum type ABC
can be a char if the compiler decides that's what it wants it to
be.
