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Showing content from https://cplusplus.com/reference/cstddef/offsetof/ below:

macro

<cstddef>

offsetof

Return member offset

This macro with functional form returns the offset value in bytes of member member in the data structure or union type type.

The value returned is an unsigned integral value of type size_t with the number of bytes between the specified member and the beginning of its structure.



Parameters
type
A type in which member is a valid member designator.

type shall be a structure or union type.

type

shall be a

POD

class (including unions).


member
A member of type.

Return value A value of type size_t with the offset value of member in type.

Example 
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/* offsetof example */
#include <stdio.h>      /* printf */
#include <stddef.h>     /* offsetof */

struct foo {
  char a;
  char b[10];
  char c;
};

int main ()
{
  printf ("offsetof(struct foo,a) is %d\n",(int)offsetof(struct foo,a));
  printf ("offsetof(struct foo,b) is %d\n",(int)offsetof(struct foo,b));
  printf ("offsetof(struct foo,c) is %d\n",(int)offsetof(struct foo,c));
  
  return 0;
}

Output: 
offsetof(struct foo,a) is 0
offsetof(struct foo,b) is 1
offsetof(struct foo,c) is 11


ExceptionsNo-throw guarantee: this macro never throws exceptions: noexcept(offsetof(type,member)) is always true.

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