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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>
  9. 	static typename TimeT::rep execution(F const &func)
  10. 	{
  11. 		auto start = std::chrono::system_clock::now();
  12. 		func();
  13. 		auto duration = std::chrono::duration_cast< TimeT>(
  14. 			std::chrono::system_clock::now() - start);
  15. 		return duration.count();
  16. 	}
  17. };
  18.  
  19. struct functor
  20. {
  21. 	int state;
  22. 	functor(int state) : state(state) {}
  23. 	void operator()() const
  24. 	{
  25. 		std::cout << "In functor run for ";
  26. 	}
  27. };
  28.  
  29. void func()
  30. {
  31. 	std::cout << "In function, run for " << std::endl;
  32. }
  33.  
  34.  
  35. int main() 
  36. {
  37. 	int dummy(3);
  38.  
  39. 	std::cout << measure<>::execution( [&dummy]() {  
  40. 		dummy *= 2; // usage with lambdas
  41. 		std::cout << "In lambda, run for ";
  42. 		}) << std::endl;
  43.  
  44. 	std::cout << measure<>::execution(functor(dummy)) << std::endl;
  45.  
  46. 	std::cout << measure<>::execution(func);
  47.  
  48. 	return 0;
  49. }
Success #stdin #stdout 0s 3340KB
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Standard input is empty
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In lambda, run for 0
In functor run for 0
In function, run for 
0
https://ideone.com/fJHlWm
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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