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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <vector>
  4. #include <memory>
  5.  
  6. struct base {
  7.   virtual ~base(){}
  8.   virtual int foo()=0;
  9. };
  10. struct derived_1 : base {
  11.   derived_1() : data(1){}
  12.   int data;
  13.   virtual int foo(){return data++;}
  14. };
  15. struct derived_2 : base {
  16.   derived_2() : data1(1), data2(1) {}
  17.   int data1;
  18.   int data2;
  19.   virtual int foo(){return --data1+ ++data2;}
  20. };
  21.  
  22. int main()
  23. {
  24.   using namespace std;
  25.   const int howmany  = 10*1000;
  26.   const int howoften = 10*1000;
  27.  
  28.   vector<unique_ptr<base> > foo;
  29.  
  30.   for (int i=0; i<howmany; ++i) {
  31.     foo.push_back(unique_ptr<base>(new derived_1()));
  32.     foo.push_back(unique_ptr<base>(new derived_2()));
  33.   }
  34.  
  35.   int sum = 0;
  36.   for (int i=0; i<howoften; ++i) {
  37.     for (auto& b : foo) {
  38.       sum += b->foo();
  39.     }
  40.   }
  41.   std::cout << sum << '\n';
  42. }
  43.  
  44.  
Success #stdin #stdout 2.44s 3252KB
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2033793664
https://ideone.com/SV16dd
language:
C++14 (gcc 8.3)
created:
13 years ago
visibility:
public

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