#include <iostream>
#include <memory>

class Vector
{
public:
    Vector(int size) : sz(size){
        elem = new double[sz];
        for (int i = 0; i < sz; ++i)
            elem[i] = i;
    }

    Vector(const Vector& other) : sz(other.sz) {
        elem = new double[sz];
        for (int i = 0; i < sz; ++i)
            elem[i] = other[i];
    }

    Vector& operator=(const Vector& a)
    {
        std::cout << "Called Vector's copy assignment operator\n";
        sz = a.sz;
        double* p = new double[sz];
        for (int i = 0; i < sz; ++i)
            p[i] = a[i];
        delete[] elem;
        elem = p;
        return *this;
    }

    Vector(Vector&& other) {
        elem = other.elem;
        sz = other.sz;
        other.elem = nullptr;
        other.sz = 0;
    }

    Vector& operator=(Vector&& other)
    {
        elem = other.elem;
        sz = other.sz;
        other.elem = nullptr;
        other.sz = 0;
        return *this;
    }

    ~Vector() {
        delete[] elem;
    }

    Vector& operator+(const Vector& other)
    {
        for (int i = 0; i < sz; ++i)
            elem[i] += other[i];
        return *this;
    }

    double &operator[](int pos) {
        return elem[pos];
    }

    const double &operator[](int pos) const {
        return elem[pos];
    }

private:
    int sz;
    double* elem;
};

int main(int argc, char* argv[])
{
    Vector a(100000000);
    Vector b(100000000);
    Vector c(100000000);
    Vector d = std::move(a+b+c);

    std::cout << "d[0] is " << d[0] << ", d[1] is " << d[1] << "\n";
    std::cout << "Press a key to exit...\n";
    std::cin.get();
    return 0;
}