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  1. 	#include <chrono>
  2. 	#include <ctime>
  3. 	#include <cstdint>
  4.     struct HighResClock
  5.     {
  6.         typedef long long                               rep;
  7.         typedef std::nano                               period;
  8.         typedef std::chrono::duration<rep, period>      duration;
  9.         typedef std::chrono::time_point<HighResClock>   time_point;
  10.         static const bool is_steady = true;
  11.         static time_point now();
  12.     };
  13.  
  14.     class Timer
  15.     {
  16.         using SysClock = std::chrono::system_clock;
  17.         using Time     = Timer::SysClock::time_point;
  18.         using Duration = Timer::SysClock::duration;
  19.         Time start_;
  20.     public:
  21.         Timer();
  22.         void Restart();
  23.  
  24.         Duration TimeElapsed() const;
  25.         int64_t TimeElapsed_s() const;
  26.         int64_t TimeElapsed_ms() const;
  27.         int64_t TimeElapsed_us() const;
  28.         int64_t TimeElapsed_ns() const;
  29.  
  30.         template<class unit>
  31.         int64_t TimeElapsed_T() const
  32.         {
  33.             return std::chrono::duration_cast<unit>(TimeElapsed()).count();
  34.         }
  35.     };
  36.  
  37.  
  38.     class HRTimer
  39.     {
  40.         using SysClock = HighResClock;
  41.         using Time = HRTimer::SysClock::time_point;
  42.         using Duration = HRTimer::SysClock::duration;
  43.         Time start_;
  44.     public:
  45.         HRTimer();
  46.         void Restart();
  47.  
  48.         Duration TimeElapsed() const;
  49.         int64_t TimeElapsed_s() const;
  50.         int64_t TimeElapsed_ms() const;
  51.         int64_t TimeElapsed_us() const;
  52.         int64_t TimeElapsed_ns() const;
  53.  
  54.         template<class unit>
  55.         int64_t TimeElapsed_T() const
  56.         {
  57.             return std::chrono::duration_cast<unit>(TimeElapsed()).count();
  58.         }
  59.     };
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
/usr/lib/gcc/i486-linux-gnu/4.8/../../../i386-linux-gnu/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: error: ld returned 1 exit status
stdout 
Standard output is empty
https://ideone.com/rYzSkg
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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