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  1. #include <iostream>
  2. #include <chrono>
  3. #include <vector>
  4. using namespace std;
  5. class B2{
  6. 		public: int randomNumber=((double) rand() / (RAND_MAX))*10;
  7. 		virtual ~B2() = default;
  8. 		virtual int f(int n){return -n+randomNumber;}
  9. 		int g(int n){return -n+randomNumber;}
  10. };
  11. class C : public B2{
  12. 	public: int f(int n) override {return n-randomNumber;}
  13. };
  14. int main() {
  15. 	std::vector<B2*> bs;
  16. 	const int numTest=1000000;
  17. 	for(int n=0;n<numTest;n++){
  18. 		if(((double) rand() / (RAND_MAX))>0.5){
  19. 			bs.push_back(new B2());
  20. 		}else{
  21. 			bs.push_back(new C());
  22. 		}
  23. 	};
  24. 	auto t1 = std::chrono::system_clock::now();
  25. 	int s=0;
  26. 	for(int n=0;n<numTest;n++){ 
  27. 		s+=bs[n]->f(n);
  28. 	};
  29. 	auto t2= std::chrono::system_clock::now();
  30. 	for(int n=0;n<numTest;n++){
  31. 		s+=bs[n]->g(n);
  32. 	};
  33. 	auto t3= std::chrono::system_clock::now();
  34. 	auto t21=t2-t1;
  35. 	auto t32=t3-t2;
  36. 	std::cout<<t21.count()<<" "<<t32.count()<<" ratio="<< (((float)t21.count())/t32.count()) << std::endl;
  37. 	std::cout<<s<<std::endl;
  38. 	for(int n=0;n<numTest;n++){
  39. 		delete bs[n];
  40. 	};
  41. }
Success #stdin #stdout 0.07s 46784KB
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stdout
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6998524 2507002 ratio=2.79159
-1688609478
https://ideone.com/nmblnK
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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