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  1. #include <iostream>
  2.  #include <set>
  3.  
  4.  class Entity {
  5.  public:
  6.  int num;
  7.  Entity(int num):num(num){}
  8.      bool operator< (const Entity& _entity) const { return (this->num < _entity.num); }
  9.  };
  10.  
  11.  struct my_cmp {
  12.      bool operator() (const Entity* lhs, const Entity* rhs) const { return (*lhs < *rhs); }
  13.  };
  14.  
  15.  class EntityManager {
  16.      private:
  17.         std::set<Entity*, my_cmp> entities;
  18.    public:
  19.         void AddEntity(int num) { entities.insert(new Entity(num)); }
  20.         void ListAllEntities() const {
  21.               unsigned int i = 0; 
  22.               for (auto& entity: entities) {
  23.                   std::cout << "Entity[" << i << "]: num:" << entity->num << std::endl;
  24.                   i++;
  25.               }
  26.          }
  27. };
  28.  
  29. int main(void) {
  30.     EntityManager manager;
  31.     manager.AddEntity(2);
  32.     manager.AddEntity(1);
  33.     manager.AddEntity(4);
  34.     manager.AddEntity(3);
  35.     manager.ListAllEntities();
  36.     return 0;
  37. }
Success #stdin #stdout 0s 4508KB
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stdin
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Standard input is empty
stdout
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Entity[0]: num:1
Entity[1]: num:2
Entity[2]: num:3
Entity[3]: num:4
https://ideone.com/lEp60h
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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