Question

If I wanted to make a function which takes the name of a struct as an argument, what would the method signature look like?

typedef struct Class{
} Class;

main()
{
    Class *a = malloc(Class);
    return instanceOf(a, Class);
}

What would the declaration of instanceOf look like?

Answer 1

You can’t pass types to functions in C. However, you can simulate this behaviour using macros:

#define new_instance(t) (malloc(sizeof(t)))

Class *instance = new_instance(Class);