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#include <chrono>
	#include <ctime>
	#include <cstdint>
    struct HighResClock
    {
        typedef long long                               rep;
        typedef std::nano                               period;
        typedef std::chrono::duration<rep, period>      duration;
        typedef std::chrono::time_point<HighResClock>   time_point;
        static const bool is_steady = true;
        static time_point now();
    };
 
 	template<class Clock>
    class Timer
    {
        using SysClock = Clock;
        using Time     = Clock::time_point;
        using Duration = Clock::duration;
        Time start_;
    public:
        Timer();
        void Restart();
 
        Duration TimeElapsed() const;
        int64_t TimeElapsed_s() const;
        int64_t TimeElapsed_ms() const;
        int64_t TimeElapsed_us() const;
        int64_t TimeElapsed_ns() const;
 
        template<class unit>
        int64_t TimeElapsed_T() const
        {
            return std::chrono::duration_cast<unit>(TimeElapsed()).count();
        }
    };
 
    using NTimer = Timer<std::chrono::sys_clock>;
    using HRTimer = Timer<HighResClock>;
 
 

prog.cpp:18:26: error: expected type-specifier
         using Time     = Clock::time_point;
                          ^
prog.cpp:19:26: error: expected type-specifier
         using Duration = Clock::duration;
                          ^
prog.cpp:20:9: error: ‘Time’ does not name a type
         Time start_;
         ^
prog.cpp:25:9: error: ‘Duration’ does not name a type
         Duration TimeElapsed() const;
         ^
prog.cpp: In member function ‘int64_t Timer<Clock>::TimeElapsed_T() const’:
prog.cpp:34:65: error: there are no arguments to ‘TimeElapsed’ that depend on a template parameter, so a declaration of ‘TimeElapsed’ must be available [-fpermissive]
             return std::chrono::duration_cast<unit>(TimeElapsed()).count();
                                                                 ^
prog.cpp:34:65: note: (if you use ‘-fpermissive’, G++ will accept your code, but allowing the use of an undeclared name is deprecated)
prog.cpp: At global scope:
prog.cpp:38:26: error: ‘sys_clock’ is not a member of ‘std::chrono’
     using NTimer = Timer<std::chrono::sys_clock>;
                          ^
prog.cpp:38:26: error: ‘sys_clock’ is not a member of ‘std::chrono’
prog.cpp:38:48: error: template argument 1 is invalid
     using NTimer = Timer<std::chrono::sys_clock>;
                                                ^

Standard output is empty