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  1. #include <iostream>
  2. #include <iomanip>
  3. #include <cmath>
  4. #include <vector>
  5. #include <string>
  6. #include <chrono>
  7.  
  8. using namespace std;
  9.  
  10. class muTimer
  11. {
  12.     using Clock = std::chrono::high_resolution_clock;
  13.     bool active = false;
  14.     Clock::duration   duration_;
  15.     Clock::time_point start_ = Clock::now(), stop_ = Clock::now();
  16.  
  17.     muTimer(const muTimer&)             = delete;
  18.     muTimer& operator=(const muTimer&)  = delete;
  19. public:
  20.     using ns       = std::chrono::nanoseconds;
  21.     using mks      = std::chrono::microseconds;
  22.     using ms       = std::chrono::milliseconds;
  23.     muTimer() { reset(); start(); }
  24.     ~muTimer() = default;
  25.     muTimer& reset()
  26.     {
  27.         duration_ = std::chrono::nanoseconds(0);
  28.         active    = false;
  29.         return *this;
  30.     }
  31.     muTimer& start()
  32.     {
  33.         if (!active)
  34.         {
  35.             start_ = Clock::now();
  36.             active = true;
  37.         }
  38.         return *this;
  39.     }
  40.     muTimer& stop()
  41.     {
  42.         if (active)
  43.         {
  44.             stop_      = Clock::now();
  45.             duration_ += stop_ - start_;
  46.             active     = false;
  47.         }
  48.         return *this;
  49.     }
  50.     template<typename T = mks>
  51.         unsigned long long duration()
  52.     {
  53.         return static_cast<unsigned long long>
  54.             (std::chrono::duration_cast<T>(stop_-start_).count());
  55.     }
  56. };
  57.  
  58.  
  59. int main(int argc, const char * argv[])
  60. {
  61.  
  62.     const int N = 10000000;
  63.     {
  64.         muTimer mt;
  65.         double sum = 0;
  66.         for(int i = 0; i < N; ++i)
  67.         {
  68.             double x = i/(1.0*N), y = N/double(N+i);
  69.             sum += pow(x,y);
  70.         }
  71.         mt.stop();
  72.         cout << mt.duration<>() << " mks\n";
  73.         cout << sum << endl;
  74.     }
  75.     {
  76.         muTimer mt;
  77.         double sum = 0;
  78.         for(int i = 0; i < N; ++i)
  79.         {
  80.             double x = i/(1.0*N), y = N/double(N+i);
  81.             sum += exp(log(x)*y);
  82.         }
  83.         mt.stop();
  84.         cout << mt.duration<>() << " mks\n";
  85.         cout << sum << endl;
  86.     }
  87.  
  88.  
  89. }
  90.  
Success #stdin #stdout 0.68s 4564KB
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Standard input is empty
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381702 mks
5.80192e+06
300877 mks
5.80192e+06
https://ideone.com/kYIFHM
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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