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  1. #include <iostream>
  2.  
  3. template<class T>
  4. class MyClass
  5. {
  6.    public:
  7.  
  8.     template<class U>
  9.     friend class MyClass;
  10.     T value;
  11.  
  12.     template<class U>
  13.     MyClass& operator=(const MyClass<U>& rhs)
  14.     {
  15.        std::cout << "Came to MyClass<T>::operator=(const MyClass<U>& rhs)\n";
  16.        return *this;
  17.     }
  18.  
  19.     // Overload for MyClass<T>
  20.     MyClass& operator=(const MyClass& rhs)
  21.     {
  22.        std::cout << "Came to MyClass<T>::operator=(const MyClass& rhs)\n";
  23.        return *this;
  24.     }
  25. };
  26.  
  27. template <> class MyClass<int> : public MyClass<long>
  28. {
  29.    public:
  30.  
  31.     template<class U>
  32.     friend class MyClass;
  33.     int value;
  34.  
  35.     template<class U>
  36.     MyClass& operator=(const MyClass<U>& rhs)
  37.     {
  38.        std::cout << "Came to MyClass<int>::operator=(const MyClass<U>& rhs)\n";
  39.        return *this;
  40.     }
  41.  
  42.     MyClass& operator=(const MyClass& rhs)
  43.     {
  44.        std::cout << "Came to MyClass<int>::operator=(const MyClass& rhs)\n";
  45.        return *this;
  46.     }
  47. };
  48.  
  49. int main()
  50. {
  51.    MyClass<int> obj1;
  52.    MyClass<long>& ref1 = obj1;
  53.  
  54.    ref1 = obj1;
  55. }
  56.  
  57.  
  58.  
Success #stdin #stdout 0.01s 16064KB
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Came to MyClass<T>::operator=(const MyClass<U>& rhs)
https://ideone.com/AqCsa3
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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