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Implement your own sizeof operator using C++
There is an option that we can implement our own sizeof() operator. The operator sizeof() is a unary operator and is used to calculate the size of any type of data. We can use #define directive to implement our own sizeof() operator which will work exactly same as sizeof() operator.
Here is the syntax to implement own sizeof() operator,
#define Any_name(object) (char *)(&object+1) - (char *)(&object)
Here,
Any_name − The name you want to give to your own sizeof() operator.
Here is an example to implement sizeof() operator in C language,
Example
#include <stdio.h>
#define to_find_size(object) (char *)(&object+1) - (char *)(&object)
int main() {
int x;
char a[50];
printf("Integer size : %d\n", to_find_size(x));
printf("Character size : %d\n", to_find_size(a));
return 0;
}Output
Integer size : 4 Character size : 50
In the above program, #define directive is used to declare our own sizeof() operator and it is calculating the size of integer and character type array.
#define to_find_size(object) (char *)(&object+1) - (char *)(&object)
….
int x;
char a[50];
printf("Integer size : %d\n", to_find_size(x));
printf("Character size : %d\n", to_find_size(a));
Updated on: 26-Jun-2020
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