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  1. #include <memory>
  2.  
  3. class generic {
  4.     class underlying_base {
  5.     public:
  6.         virtual ~underlying_base(){}
  7.         virtual void SomeGenericMethod()=0;
  8.     };
  9.     template <class T>
  10.     class underlying_impl : public underlying_base {
  11.         T data;
  12.     public:
  13.         underlying_impl(const T& d) :data(d) {}
  14.         virtual void SomeGenericMethod() 
  15.         {return data.SomeGenericMethod();}
  16.     };
  17.     public:
  18.         std::unique_ptr<underlying_base> data;
  19.  
  20.         template < class T > void setOther(const T& other) {
  21.             data.reset(new underlying_impl<T>(other));
  22.         }
  23.  
  24.         void doSomethingWithOther() {
  25.             data->SomeGenericMethod();
  26.         }
  27. };
  28.  
  29. #include <iostream>
  30. struct Bar {
  31.     void SomeGenericMethod() {std::cout << "BAR\n";}
  32. };
  33.  
  34. int main(int argc, char **argv) {
  35.     generic fObj;
  36.     Bar bObj;
  37.     fObj.setOther(bObj);
  38.     fObj.doSomethingWithOther();
  39.     return 0;
  40. }
Success #stdin #stdout 0s 2960KB
comments ()
stdin 
Standard input is empty
stdout 
BAR
https://ideone.com/A1Aqu
language:
C++14 (gcc 8.3)
created:
13 years ago
visibility:
public

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