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  1. #include <string>
  2. #include <vector>
  3. #include <memory>
  4. #include <algorithm>
  5. #include <iostream>
  6.  
  7. struct Base
  8. {
  9.     typedef std::shared_ptr<Base> SharedPtr;
  10.     virtual ~Base(){}
  11.     virtual void print(){}
  12.     template<class T>
  13.     static SharedPtr makeDerived(const std::string& name);
  14.  
  15.     static std::vector<SharedPtr> objs;
  16. };
  17. std::vector<Base::SharedPtr> Base::objs;
  18. template<class T>
  19. struct Derived : public Base
  20. {
  21.     Derived(const std::string& name):name(name){}
  22.     void print(){std::cout<<name<<std::endl;}
  23.     std::string name;
  24. };
  25.  
  26. template<class T>
  27. Base::SharedPtr Base::makeDerived(const std::string& name)
  28. {
  29.     SharedPtr p = std::make_shared<Derived<T> >(Derived<T>(name));
  30.     objs.push_back(p);
  31.     return p;
  32. }
  33.  
  34. int main()
  35. {
  36.     Base::makeDerived<bool>("online");
  37.     Base::makeDerived<int>("users");
  38.     std::for_each(Base::objs.begin(),Base::objs.end(),[](Base::SharedPtr p){p->print();});
  39. }
Success #stdin #stdout 0s 3036KB
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online
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https://ideone.com/DUB7dd
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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