implement a sizeof function

sizeof.cpp

// reference
// https://cs-fundamentals.com/tech-interview/c/implement-sizeof-operator-in-c.php
#include <cstdio>
#define MY_SIZEOF(object) (char*)(&object + 1) - (char*)(&object)
int main()
{
    double x;
    int arr[10];
    printf("double var size: %d\n", MY_SIZEOF(x));
    printf("double type size: %d\n", sizeof(double));
    printf("int arr[10] size : %d\n", MY_SIZEOF(arr));
    return 0;
}