Class data

examples/move.cpp:8–56

#include <vector>

class data final {
   public:
    static std::size_t copies_;
    static std::size_t moves_;

    data() = default;
    explicit data(int value) : value_{value} {}

    int get_value() const { return value_; }

    data(const data& other) noexcept : value_{other.value_}
    {
        std::cout << "copy " << value_ << '\n';
        ++copies_;
    }

    data& operator=(const data& other)
    {
        if (this != &other) {
            value_ = other.value_;
            std::cout << "copy " << value_ << '\n';
            ++copies_;
        }

        return *this;
    }

    data(data&& other) noexcept : value_{other.value_}
    {
        std::cout << "move " << value_ << '\n';
        ++moves_;
    }

    data& operator=(data&& other) noexcept
    {
        if (this != &other) {
            value_ = other.value_;
            std::cout << "move " << value_ << '\n';
            ++moves_;
        }

        return *this;
    }

    ~data() = default;

   private:
    int value_{};
};

std::size_t data::copies_{};
std::size_t data::moves_{};