C method for iterating through a struct's members like an array?

Question

Let\'s say I have a vector class:

typedef struct vec3_s
{
    float x, y, z;
}
vec3;

But, I would like to be able to iterate through it wit

Answer 1

If all of your structure fields are of the same type, you could use a union as following:

typedef union vec3_u
{
    struct vec3_s {
        float x, y, z;
    };
    float vect3_a[3];
}
vec3;

This way you could access to each x, y or z field independently or iterate over them using the vect3_a array. This solution cost nothing in term of memory or computation but we may be a bit far from a C++ like solution.