Class Socket

08-String & Stream/example-answer/src/Socket.h:25–95

{

class Socket
{
#ifdef _WIN32
    inline static constexpr SOCKET s_invalidSocket_ = INVALID_SOCKET;
    SOCKET socket_{ s_invalidSocket_ };
#else
    inline static constexpr int s_invalidSocket_ = -1;
    int socket_{ s_invalidSocket_ };
#endif

public:
    enum class Tag
    {
        Listen,
        Accept,
        Connect
    };

    Socket() = default;

    // Listen socket or connect socket.
    Socket(const char *ip, std::uint16_t port, Tag tag);

    // Accept socket; To distinguish it from copy ctor (in fact socket doesn't
    // have it), add a tag param.
    Socket(const Socket &listenSock, Tag tag);

    Socket(Socket &&another) noexcept
        : socket_{ std::exchange(another.socket_, s_invalidSocket_) }
    {
    }
    Socket &operator=(Socket &&another) noexcept
    {
        if (this == &another)
        {
            return *this;
        }
        if (*this)
            Clean_();
        socket_ = std::exchange(another.socket_, s_invalidSocket_);
        return *this;
    }

    ~Socket()
    {
        if (*this)
            Clean_();
    }

    // Clean and reset.
    void Close()
    {
        if (*this)
        {
            Clean_();
            socket_ = s_invalidSocket_;
        }
    }