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  1. #include <iostream>
  2. #include <chrono>
  3.  
  4.  
  5. template<typename TimeT = std::chrono::milliseconds>
  6. struct measure
  7. {
  8.     template<typename F, typename ...Args>
  9.     static typename TimeT::rep execution(F func, Args&&... args)
  10.     {
  11.         auto start = std::chrono::system_clock::now();
  12.  
  13.         // Now call the function with all the parameters you need.
  14.         func(std::forward<Args>(args)...);
  15.  
  16.         auto duration = std::chrono::duration_cast< TimeT> 
  17.                             (std::chrono::system_clock::now() - start);
  18.  
  19.         return duration.count();
  20.     }
  21. };
  22.  
  23. struct functor
  24. {
  25. 	int state;
  26. 	functor(int state) : state(state) {}
  27. 	void operator()() const
  28. 	{
  29. 		std::cout << "In functor run for ";
  30. 	}
  31. };
  32.  
  33. void func()
  34. {
  35. 	std::cout << "In function, run for ";
  36. }
  37.  
  38.  
  39. int main() 
  40. {
  41. 	int dummy(3);
  42.  
  43. 	std::cout << measure<std::chrono::nanoseconds>::execution( [&dummy]() 
  44. 	{  
  45. 		dummy *= 2; // usage with lambdas
  46. 		std::cout << "In lambda, run for ";
  47. 	}) << std::endl;
  48.  
  49. 	std::cout << measure<std::chrono::nanoseconds>::execution(functor(dummy)) << std::endl;
  50.  
  51. 	std::cout << measure<std::chrono::nanoseconds>::execution(func);
  52.  
  53. 	return 0;
  54. }
Success #stdin #stdout 0s 3140KB
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Standard input is empty
stdout
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In lambda, run for 18918
In functor run for 804
In function, run for 1718
https://ideone.com/JbUkPq
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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