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  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. class A; // forward declaration.
  5.  
  6. class A
  7. {
  8. public:
  9.     int val;
  10.     void print() const { std::cout << val << std::endl; }
  11.  
  12.     template <typename T>
  13.     std::enable_if_t<std::is_same<int, T>::value, A&>
  14.     operator=(const T& input){
  15.         val = 2 * input; //Overload I
  16.         return *this;
  17.     }
  18.     template <typename T>
  19.     std::enable_if_t<std::is_same<A, T>::value, A&>
  20.     operator=(T& rhs){
  21.         val = 5 * rhs.val; //Overload II
  22.         return *this;
  23.     }
  24. };
  25.  
  26. int main()
  27. {
  28.     A Aa;
  29.     A Bb;
  30.     int in_a = 3;
  31.     Aa = in_a;
  32.     Bb = Aa; 
  33.     Aa.print(); //This should give 6. (3x2)
  34.     Bb.print(); //This should give 30. (6x5)
  35. }
  36.  
Success #stdin #stdout 0s 3468KB
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stdin
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Standard input is empty
stdout
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6
30
https://ideone.com/BuqW2D
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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