[Fwd: non-POD error]

[Fwd: non-POD error]

[Chris Croswhite]

Forgot to mention the system:

gcc 3.2.1
Linux 2.4.18
x86

Error does not appear in gcc2.95.3 or 3.1


Could someone explain to me why I am seeing this error on the following
code:

warning: invalid offsetof from non-POD type `struct
   endpoint_net_struct'; use pointer to member instead

Test case:

#include <stdio.h>
#include <linux/stddef.h>

class Myclass {
  int _val;
};

struct foo_struct {
  void *bar;
  Myclass a;
};

int main(void)
{
  printf("offset is %d\n", offsetof(struct foo_struct, bar));
}


If I remove the reference to the class, then I do not get this warning.
Is there a correct way to avoid this?

TIA,
Chris

Re: [Fwd: non-POD error]

[Gabriel Dos Reis]

"Chris Croswhite" <ccroswhite@get2chip.com> writes:

| Could someone explain to me why I am seeing this error on the following
| code:
| 
| warning: invalid offsetof from non-POD type `struct
|    endpoint_net_struct'; use pointer to member instead
| 
| Test case:
| 
| #include <stdio.h>
| #include <linux/stddef.h>
| 
| class Myclass {
|   int _val;
| };

Saying class is equivalent to saying "struct" with making the default
access be private.  Therefore the above declares Myclass as having a
private data member named _val.  Therefore it is not a POD type, since
a POD cannot have a private data member.

[...]

| If I remove the reference to the class, then I do not get this warning.
| Is there a correct way to avoid this?

You probably wanted to say "struct Myclass" and not "class Myclass".

-- Gaby