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  1. #include <iostream>
  2.  
  3. template <typename T>
  4. class Number
  5. {
  6.     T val;
  7.     template<typename U>
  8.     friend std::ostream& operator<< (std::ostream& os, const Number<U>& num);
  9. public:
  10.     Number() : val(T{}) { }
  11.     Number(T value) : val{ value } { }
  12. };
  13.  
  14. template <typename T>
  15. std::ostream& operator<< (std::ostream& os, const Number<T>& num)
  16. {
  17.     os << num.val;
  18.     return os;
  19. }
  20.  
  21. int main()
  22. try
  23. {
  24.     Number<int> a;
  25.     a = 10;
  26.     std::cout << a;
  27.     return 0;
  28. }
  29. catch (std::exception& e)
  30. {
  31.     std::cout << e.what();
  32.     return 1;
  33. }
  34. catch (...)
  35. {
  36.     std::cout << "Unknown error";
  37.     return 2;
  38. }
  39.  
Success #stdin #stdout 0.01s 5484KB
comments (?)
stdin 
Standard input is empty
stdout 
10
https://ideone.com/0Mq5Cf
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
secret

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