size of struct with pointers and function pointers

Hi,

I following structure

Code:

---

typedef struct
{
UINT32 abc;
int (*f)(int a, intb);
char *ptr;
} my_struct;

main()
{
my_struct myParams;
sizeof(myParams);
}

---

Assume int is 4 bytes and char is 1 byte. I know the size of structure without pointers inside. But I am not sure with pointers and function pointers. Is it 4+4+4(12) or something else??

Thanks in advance.
Johnny

size of int + size of function pointer + size of char pointer (it's not a char you have, you have a char pointer, which is not 1) + any padding it feels like adding = size of your structure.


Quzah.

Thanks Quzah,

I compiled and got these.

sizeof(void*) is 4. Same way sizeof(char*) is also 4.
The total size is 12 bytes = 4 for int + 4 for function ptrs +4 for char*.

Note that the size of any type is implementation defined. You can guess reasonably well on what size a structure and type may be, but you can never be sure. It changes from compiler to compiler.