enum and struct namespaces

[Grumble]

Hello,

I thought names of enums and names of structs lived in different
namespaces, in C89. Am I mistaken? It would seem so:

$ cat testcase.c
struct foobar { int x,y,z; };
enum foobar {AAA, BBB, CCC};
int main(void) { return 0; }

$ gcc-3.4.3 -Wall -ansi -pedantic testcase.c
testcase.c:2: error: `foobar' defined as wrong kind of tag

$ icc-8.0 -strict_ansi testcase.c
testcase.c(2): error: "foobar" has already been declared in the current
scope
enum foobar {AAA, BBB, CCC};
^

compilation aborted for testcase.c (code 2)

It seems the correct term is 'scope' instead of 'namespace'? I don't
understand why the standard would impose such a limitation? It seems
trivial to determine that 'struct foobar' and 'enum foobar' are two
unrelated types?

--
Regards, Grumble

[Michael Mair]

Re: enum and struct namespaces



Grumble wrote:[color=blue]
> Hello,
>
> I thought names of enums and names of structs lived in different
> namespaces, in C89. Am I mistaken?[/color]

Yes, you are.
Tags for structures, unions and enumerations live all in the
same namespace.
[color=blue]
> It would seem so:
>
> $ cat testcase.c
> struct foobar { int x,y,z; };
> enum foobar {AAA, BBB, CCC};
> int main(void) { return 0; }
>
> $ gcc-3.4.3 -Wall -ansi -pedantic testcase.c
> testcase.c:2: error: `foobar' defined as wrong kind of tag
>
> $ icc-8.0 -strict_ansi testcase.c
> testcase.c(2): error: "foobar" has already been declared in the current
> scope
> enum foobar {AAA, BBB, CCC};
> ^
>
> compilation aborted for testcase.c (code 2)
>
> It seems the correct term is 'scope' instead of 'namespace'?[/color]

Obviously, you can use the same tag for completely unrelated
scopes.
[color=blue]
> I don't
> understand why the standard would impose such a limitation? It seems
> trivial to determine that 'struct foobar' and 'enum foobar' are two
> unrelated types?[/color]

The limitation does not make much sense but it is there.
In C99, too.


Cheers
Michael
--
E-Mail: Mine is a gmx dot de address.

[Mark A. Odell]

Re: enum and struct namespaces

Grumble <devnull@kma.eu .org> wrote in
news:cppeo0$sj8 $1@news-rocq.inria.fr:
[color=blue]
> Hello,
>
> I thought names of enums and names of structs lived in different
> namespaces, in C89.[/color]

Maybe you are thinking about typedef and enum/struct/union tags?

--
- Mark ->
--

[Grumble]

Re: enum and struct namespaces

Grumble wrote:
[color=blue]
> It seems the correct term is 'scope' instead of 'namespace'?[/color]

Please disregard this particular question.

(My brain must have gone numb for a minute.)

--
Regards, Grumble