struct initialization

[Leo Havmøller]

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.

 

[Ben Bacarisse]

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.

 

[Igmar Palsenberg]

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

 

[Leo Havmøller]

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.