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  1. #include <set>
  2. #include <iostream>
  3.  
  4. struct Base
  5. {
  6.     Base(int xx, int yy) : x(xx), y(yy){}
  7.     bool operator<(const Base&) const {return true;}
  8.  
  9.     int x;
  10.     int y;
  11. };
  12.  
  13. struct D1 : Base
  14. {
  15.     D1(int x, int y) : Base(x, y){}
  16. };
  17.  
  18. struct D2 : Base
  19. {
  20.     D2(int x = 0, int y = 0) : Base(x, y){}
  21. };
  22.  
  23. void test()
  24. {
  25.     std::set<D1> s1;
  26.     std::set<D2> s2;
  27.  
  28.     s1.insert({1, 2});
  29.     s2.insert({1, 2});
  30.  
  31.     std::cout<<"s1 size:"<<s1.size()<<std::endl<<"Content:"<<std::endl;
  32.     for(auto& v : s1)
  33.     {
  34.         std::cout<<v.x<<" "<<v.y<<std::endl;
  35.     }
  36.  
  37.     std::cout<<std::endl<<"s2 size:"<<s2.size()<<std::endl<<"Content:"<<std::endl;
  38.     for(auto& v : s2)
  39.     {
  40.         std::cout<<v.x<<" "<<v.y<<std::endl;
  41.     }
  42. }
  43.  
  44. int main()
  45. {
  46.     test();
  47. }
Success #stdin #stdout 0s 3416KB
comments (?)
stdin 
Standard input is empty
stdout 
s1 size:1
Content:
1 2

s2 size:2
Content:
2 0
1 0
https://ideone.com/UPArOi
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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