 |
 |
 |
C++ Reference: offsetof()
offsetof()
Definition
#define offsetof(s,m) (size_t)&(((s *)0)->m)
Description
Although offsetof looks like a function it is actually just a macro. The result of the macro is a size_t that tells the number of bytes that the member "m" is offset from the beginning of an instance of the data type "s."
Example
#include <iostream>
#include <cstddef>
struct SSomeData {
char mcChar;
int miInt;
double mdDouble;
bool mbBool;
};
int main() {
using namespace std;
cout << "Offset of mcChar = "
<< offsetof(SSomeData, mcChar) << endl;
cout << "Offset of miInt = "
<< offsetof(SSomeData, miInt) << endl;
cout << "Offset of mdDouble = "
<< offsetof(SSomeData, mdDouble) << endl;
cout << "Offset of mbBool = "
<< offsetof(SSomeData, mbBool) << endl;
return 0;
}
Output:
|
|
|
| Home | | | Reference | | | Play Games! | | | Blog | | | Forum | | | Site Map | | | Contact Us |
