#include <cstdio>
#include <cstring>
struct float3 {
    float a[3], &x, &y, &z;
    float3() : x(a[0] = 0), y(a[1] = 0), z(a[2] = 0) {}
    float3(float x, float y, float z) : x(a[0] = x), y(a[1] = y), z(a[2] = z) {}
    float3 operator()(int i, int j, int k) {return float3(_(i), _(j), _(k));}
    float operator()(int i) {return _(i);}
    float _(int i) {return a[i % 3];}
    float3 &operator=(const float3 &r) {
	std::memcpy(a, r.a, sizeof a);
	return *this;
    }
};
void p(float3 &a) {
    std::printf("%f %f %f\n", a.x, a.y, a.z);
}
int main() {
    float3 a(10, 11, 12), b = a(1, 1, 1), c;
    c = a(2, 2, 2);
    p(a), p(b), p(c);
    return 0;
}
 

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