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  1. namespace A{
  2.     class B;
  3. }
  4.  
  5. A::B operator+(A::B a, A::B b);
  6.  
  7. namespace A{
  8.     class B {
  9.     private:
  10.         int i;
  11.     public:
  12.         B() : i(0) {}
  13.         B(int j) : i(j) {}
  14.  
  15.         B friend ::operator+(B a, B b);
  16.     };
  17. }
  18.  
  19. A::B operator+(A::B a, A::B b) {
  20.     return A::B(a.i + b.i);
  21. }
  22.  
  23. int main() {
  24.     A::B a(1), b(2);
  25.     A::B c = a+b;
  26.     return 0;
  27. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/LrWnqK
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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