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  1. class Base {
  2. public:
  3.  
  4.     class Thing {
  5.     public:
  6.         Thing(Base& b) : _b(b) {};
  7.  
  8.         Thing& operator+= (const Thing p) { _b.add(*this, p); return *this; };
  9.  
  10.         int k;
  11.     protected:
  12.         Base& _b;
  13.     };
  14.  
  15.     void add(Thing &d, const Thing s) { d.k += s.k; }
  16. };
  17.  
  18. template <class... Interfaces>
  19. class Extensible : virtual public Base, virtual public Interfaces... {
  20.  
  21.     class Thing : virtual public Base::Thing, virtual public Interfaces::Thing... {
  22.  
  23.     };
  24. };
  25.  
  26. class SomeInterface : Base {
  27.     void multiply(Thing &d, const Thing s) { d.k *= s.k; }
  28.  
  29.     class Thing : public Base::Thing {
  30.         Thing& operator*= (const Thing p) {
  31.             //_b.multiply(*this, p); return *this; // <-- won't work of course
  32.         };
  33.  
  34.     };
  35.  
  36. };
  37.  
  38. int main() {
  39.     Extensible<SomeInterface> a;
  40.     return 0;
  41. }
  42.  
Success #stdin #stdout 0s 3292KB
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https://ideone.com/6JY2ut
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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