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  1. #include <iostream>
  2. #include <typeinfo>
  3. #include <unordered_map>
  4. using namespace std;
  5.  
  6. struct base { base(){} virtual ~base(){} };
  7. struct A:public base { A(){} };
  8. struct B:public base { B(){} };
  9. struct C:public base { C(){} };
  10. typedef base *Creaton();
  11. template<class T> base *creaton() { return new T; };
  12.  
  13. int main()
  14.   {
  15.    unordered_map<string,Creaton*> tb={{{"a",creaton<A>},{"b",creaton<B>},{"c",creaton<C>}}};
  16.    base *tmp;
  17.  
  18.    tmp=tb["b"]();
  19.    cout<<typeid(*tmp).name()<<endl;
  20.    delete tmp;
  21.  
  22.    tmp=tb["a"]();
  23.    cout<<typeid(*tmp).name()<<endl;
  24.    delete tmp;
  25.  
  26.    return 0;
  27.   }
Success #stdin #stdout 0s 3416KB
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https://ideone.com/fAHQZi
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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