Test Copy and Move constructor

test.cpp

#include <iostream>

struct MyVector {

    size_t current_size = 0;
    size_t capacity = 0;
    double* data = nullptr;

    MyVector() : capacity { 10 }, current_size { 0 }
    {
        std::cout << "default constructor" << std::endl;
        data = new double[capacity];
    }

    MyVector(const MyVector& other)
    {
        std::cout << "copy constructor" << std::endl;
        capacity = other.capacity;
        current_size = other.current_size;
        data = new double[capacity];
        for (size_t i = 0; i < capacity; i++) {
            data[i] = other.data[i];
        }
    }

    MyVector(MyVector&& other) noexcept 
    {
        std::cout << "move constructor" << std::endl;
        capacity = other.capacity;
        current_size = other.current_size;
        data = other.data;

        other.capacity = 0;
        other.current_size = 0;
        other.data = nullptr;
    }

    ~MyVector()
    {
        delete[] data;
        data = nullptr;
    }
    
    double operator[](size_t i)
    {
        return data[i];
    }

    void push_back(double x)
    {
        if (capacity == 0) {
            data = new double[capacity];
        } else if (current_size == capacity) {
            capacity = capacity * 2;
            auto new_data = new double[capacity];
            for (size_t i = 0; i < current_size; i++) {
                new_data[i] = data[i];
            }
            delete[] data;
            data = new_data;
        }

        data[current_size + 1] = x;
        current_size += 1;
    }
};

int main()
{
    MyVector v1;
    v1.push_back(1);
    v1.push_back(2);

    MyVector v2 { v1 };
    std::cout << "v1.current_size = " << v1.current_size << " data addr = " << v1.data
              << std::endl;
    std::cout << "v2.current_size = " << v2.current_size << " data addr = " << v2.data
              << std::endl;

    MyVector v3 { std::move(v1) };
    std::cout << "v1.current_size = " << v1.current_size << " data addr = " << v1.data
              << std::endl;
    std::cout << "v3.current_size = " << v3.current_size << " data addr = " << v3.data
              << std::endl;
}