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  1. #include <iostream>
  2. #include <vector>
  3. #include <cstdlib>
  4. #include <chrono>
  5.  
  6. using namespace std;
  7.  
  8. struct base
  9. {
  10.   int type;
  11.   virtual int get() = 0;
  12.   virtual ~base() {}
  13. };
  14.  
  15. struct class1 : base
  16. {
  17.   class1() { type = 1; }
  18.   virtual int get() { return 11; }
  19. };
  20.  
  21. struct class2 : public base
  22. {
  23.   class2() { type = 2; }
  24.   virtual int get() { return 27; }
  25. };
  26.  
  27. class timer
  28. {
  29.   using T = std::chrono::time_point<std::chrono::steady_clock>;
  30.   T t1, t2;
  31. public:
  32.   void start() { t1 = std::chrono::steady_clock::now(); }
  33.   void stop() { t2 = std::chrono::steady_clock::now(); }
  34.   void print() const { std::cout << "Time: " << (t2 - t1).count() << endl; }
  35. };
  36.  
  37. int main()
  38. {
  39.   vector <base *> v;
  40.   int s = 0;
  41.   timer t;
  42.  
  43.   srand(time(0));
  44.   for (unsigned q=0; q<50000000; ++q) v.push_back(rand()&1 ? (base*)new class1() : (base*)new class2());
  45.  
  46.   t.start();
  47.   for (auto x : v) s += x->get();
  48.   t.stop();
  49.  
  50.   cout << s << endl;
  51.   t.print();
  52.  
  53.   for (auto x : v) delete x;
  54.  
  55.   return 0;
  56. }
Success #stdin #stdout 3.21s 1577472KB
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Standard input is empty
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949992080
Time: 285762729
https://ideone.com/RCtNma
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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