Log file class

class LogStream {
public:
    explicit LogStream(const std::string& path) : out(path, std::ios::binary) {};
    LogStream(const LogStream&) = delete;
    LogStream(LogStream&&) = delete;

    LogStream& operator=(const LogStream&) = delete;
    LogStream& operator=(LogStream&&) = delete;

    ~LogStream() { out.close(); };
public:
    static std::string GetStringTime() {
        std::chrono::time_point now = std::chrono::system_clock::now();
        std::time_t now_t = std::chrono::system_clock::to_time_t(now);
        std::tm now_tm = *std::localtime(&now_t);
        char buffer[80];
        strftime(buffer, 80, "[%c]", &now_tm);
        return buffer;
    }
public:
    void Write(const std::string& msg) { std::copy(msg.begin(), msg.end(), std::ostreambuf_iterator(out)); }
    void WriteLine(const std::string& msg) { Write(msg + "\n"); }
    void Log(const std::string& msg) { WriteLine(GetStringTime() + " [Info] : " + msg); }
    void Err(const std::string& msg) { WriteLine(GetStringTime() + " [ERROR] : " + msg); }
private:
    std::ofstream out;
};