On Thu, Sep 24, 2015 at 12:04 PM, jmp <jeanmic...@sequans.com> wrote:
> I'm not an expert but I think this "return by value thing" is only for C++.
> In vintage C, you can only return something that fits within a register.
If that was true at one time, it was before ANSI C.
$ cat test.c
#include <assert.h>
struct foo {
int a;
long b;
float c;
double d;
};
struct foo get_foo() {
struct foo value;
value.a = 12;
value.b = 92L;
value.c = 4.5f;
value.d = -21.5;
return value;
}
int main() {
struct foo value = get_foo();
assert(value.a == 12);
assert(value.b == 92L);
assert(value.c == 4.5f);
assert(value.d == -21.5);
return 0;
}
$ gcc -Wall -O0 -std=c89 test.c
$ ./a.out
$
There is a danger however in that it's only a shallow copy. If any
struct members are pointers, then the pointer value will be copied,
not the thing pointed to.
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