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Hi,

A struct:

typedef struct
{
int a;
char b;
long c;
} testtype;

A fairly typical way of initializing all field to zero is:

testtype s1 = { 0 };

But i recently came across the following:

testtype s2 = { };

I.e. nothing between the braces.
What does the standards say about that?
Are all fields zeroed like in the first example?

Leo Havmøller.

Leo Havmøller <> writes:

> A struct:
>
> typedef struct
> {
> int a;
> char b;
> long c;
> } testtype;
>
> A fairly typical way of initializing all field to zero is:
>
> testtype s1 = { 0 };
>
> But i recently came across the following:
>
> testtype s2 = { };
>
> I.e. nothing between the braces.
> What does the standards say about that?

It's a syntax error.

> Are all fields zeroed like in the first example?

If it is accepted as an extension, I'd expect that to be the case, but
it is not ISO C.

--
Ben.

> testtype s2 = { };
>
> I.e. nothing between the braces.
> What does the standards say about that?

That it isn't allowed.

> Are all fields zeroed like in the first example?

If your compiler supports it, that is most likely the case.



Igmar

Thank you very much for the responses, everyone.
I saw it in some code that AFAIK was written this year.
It is currently compiled with GCC 4.3.3, but it will also be used with other
compilers, so i think i will locate it again and fix it.

Leo Havmøller.