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  1. #include <iostream>
  2. #include <iomanip>
  3. #include <chrono>
  4.  
  5. using namespace std;
  6.  
  7.  
  8. class muTimer
  9. {
  10.     using Clock = std::chrono::high_resolution_clock;
  11.     bool active = false;
  12.     Clock::duration   duration_;
  13.     Clock::time_point start_ = Clock::now(), stop_ = Clock::now();
  14.  
  15.     muTimer(const muTimer&)             = delete;
  16.     muTimer& operator=(const muTimer&)  = delete;
  17. public:
  18.     using ns       = std::chrono::nanoseconds;
  19.     using mks      = std::chrono::microseconds;
  20.     using ms       = std::chrono::milliseconds;
  21.     muTimer() { reset(); start(); }
  22.     ~muTimer() = default;
  23.     muTimer& reset()
  24.     {
  25.         duration_ = std::chrono::nanoseconds(0);
  26.         active    = false;
  27.         return *this;
  28.     }
  29.     muTimer& start()
  30.     {
  31.         if (!active)
  32.         {
  33.             start_ = Clock::now();
  34.             active = true;
  35.         }
  36.         return *this;
  37.     }
  38.     muTimer& stop()
  39.     {
  40.         if (active)
  41.         {
  42.             stop_      = Clock::now();
  43.             duration_ += stop_ - start_;
  44.             active     = false;
  45.         }
  46.         return *this;
  47.     }
  48.     template<typename T = mks>
  49.         unsigned long long duration()
  50.     {
  51.         return static_cast<unsigned long long>
  52.             (std::chrono::duration_cast<T>(stop_-start_).count());
  53.     }
  54. };
  55.  
  56.  
  57. int main()
  58. {
  59.     const int N = 1000000000;
  60.     {
  61.         muTimer mt;
  62.         for(int i = 0; i < N; ++i);
  63.         cout << mt.stop().duration() << endl;
  64.     }
  65.     {
  66.         muTimer mt;
  67.         for(int i = N; i > 0; --i);
  68.         cout << mt.stop().duration() << endl;
  69.     }
  70. }
  71.  
  72.  
Success #stdin #stdout 0s 4544KB
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https://ideone.com/9WYPGW
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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