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  1. #include <iostream>
  2.  
  3. struct NumberObject;
  4. struct NumberString;
  5.  
  6. struct DataType
  7. {
  8.     virtual ~DataType() = default;
  9.     virtual void operator=(const DataType&) = 0;
  10.     virtual void assignTo(NumberObject&) const = 0;
  11.     virtual void assignTo(NumberString&) const = 0;
  12. };
  13.  
  14. struct NumberObject : DataType
  15. {
  16.     double data = 7;
  17.     void operator=(const DataType& rhs) override { rhs.assignTo(*this); }
  18.  
  19.     void assignTo(NumberObject& rhs) const override
  20.     {
  21.         std::cout << "Copying from NumberObject to NumberObject\n"; 
  22.     }
  23.     void assignTo(NumberString& rhs) const override
  24.     {
  25.         std::cout << "Copying from NumberObject to NumberString\n";
  26.     }
  27. };
  28.  
  29. struct NumberString : DataType
  30. {
  31.     std::string data = "7";
  32.     void operator=(const DataType& rhs) override { rhs.assignTo(*this); }
  33.  
  34.     void assignTo(NumberObject& rhs) const override
  35.     {
  36.         std::cout << "Copying from NumberString to NumberObject\n"; 
  37.     }
  38.     void assignTo(NumberString& rhs) const override
  39.     {
  40.         std::cout << "Copying from NumberString to NumberString\n";
  41.     }
  42. };
  43.  
  44.  
  45.  
  46. int main()
  47. {
  48.     NumberObject number;
  49.     NumberString string;
  50.  
  51.     DataType* pDataType1 = &number;
  52.     DataType* pDataType2 = &string;
  53.     *pDataType1 = *pDataType2;
  54. }
Success #stdin #stdout 0s 16064KB
comments (?)
stdin 
Standard input is empty
stdout 
Copying from NumberString to NumberObject
https://ideone.com/U4bwew
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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