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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 ~base() {}
  12. };
  13.  
  14. struct class1 : base
  15. {
  16.   class1() { type = 1; }
  17.   int get() { return 11; }
  18. };
  19.  
  20. struct class2 : public base
  21. {
  22.   class2() { type = 2; }
  23.   int get() { return 27; }
  24. };
  25.  
  26. class timer
  27. {
  28.   using T = std::chrono::time_point<std::chrono::steady_clock>;
  29.   T t1, t2;
  30. public:
  31.   void start() { t1 = std::chrono::steady_clock::now(); }
  32.   void stop() { t2 = std::chrono::steady_clock::now(); }
  33.   void print() const { std::cout << "Time: " << (t2 - t1).count() << endl; }
  34. };
  35.  
  36. int main()
  37. {
  38.   vector <base *> v;
  39.   int s = 0;
  40.   timer t;
  41.  
  42.   srand(time(0));
  43.   for (unsigned q=0; q<50000000; ++q) v.push_back(rand()&1 ? (base*)new class1() : (base*)new class2());
  44.  
  45.   t.start();
  46.   for (auto x : v)
  47.     switch (x->type)
  48.     {
  49. 	  case 1:   s += ((class1*)x)->get();   break;
  50. 	  case 2:   s += ((class2*)x)->get();   break;
  51.     }
  52.   t.stop();
  53.  
  54.   cout << s << endl;
  55.   t.print();
  56.  
  57.   for (auto x : v) delete x;
  58.  
  59.   return 0;
  60. }
Success #stdin #stdout 3.34s 1577472KB
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Standard input is empty
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949948464
Time: 245933290
https://ideone.com/tPlm81
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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