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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. class Foo
  6. {
  7. public:
  8.     int a;
  9.     int Index;
  10.  
  11.     Foo(int _x) : a(_x), Index(-1) {} 
  12.     Foo(const Foo &_f) : a(_f.a) { Index = ++(const_cast<Foo&>(_f).Index); } 
  13. };
  14.  
  15. int main()
  16. {
  17.     int a = 5;
  18.     std::vector<Foo> Instances (30, a);
  19.  
  20.     for(auto &f : Instances)
  21.         cout << f.Index << ' ';
  22.  
  23. 	return 0;
  24. }
Success #stdin #stdout 0s 15232KB
comments (?)
stdin 
Standard input is empty
stdout 
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
https://ideone.com/7KI4Ju
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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