offsetof() example

c.c

/*
 * Reference: http://stackoverflow.com/questions/9169453/gcc-4-4-3-offsetof-constant-expression-bug-how-should-i-work-around-this
 * Should compile and execute without error or warning with:
 * gcc c.c -pedantic -std=c89 -o c && ./c
 * or
 * gcc c.c -pedantic -std=c99 -o c && ./c
 */

#include <stddef.h>
#include <stdlib.h>

struct SomeType {
    int m_member;
};

int main(void) {
    switch (0) {
        case offsetof(struct SomeType, m_member):
            exit(EXIT_SUCCESS);
        default:
            exit(EXIT_FAILURE);
    }
    return 0;
}

c.cpp

// Reference: http://stackoverflow.com/questions/9169453/gcc-4-4-3-offsetof-constant-expression-bug-how-should-i-work-around-this
// Should compile and execute without error or warning with:
// g++ c.cpp -pedantic -std=c++98 -o c && ./c
// or
// g++ c.cpp -pedantic -std=c++0x -o c && ./c

#include <cstddef>
#include <cstdlib>

struct SomeType {
    int m_member;
};

int main() {
    switch (0) {
        case offsetof(SomeType, m_member):
            exit(EXIT_SUCCESS);
        default:
            exit(EXIT_FAILURE);
    }
}