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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. namespace simple {
  5.  
  6. class InterfaceA {
  7.  public:
  8.   virtual ~InterfaceA() {}
  9.  
  10.   virtual int MethodOne() const = 0;
  11. };
  12.  
  13. class InterfaceB : virtual public InterfaceA {  // <-- note the virtual keyword
  14.  public:
  15.   ~InterfaceB() override {}
  16.  
  17.   virtual int MethodTwo() const = 0;
  18. };
  19.  
  20. class ImplA : virtual public InterfaceA { // <-- note the virtual keyword
  21.  public:
  22.   ImplA(int to_return);
  23.   ~ImplA() override {}
  24.  
  25.   int MethodOne() const override;
  26.  
  27.  private:
  28.   int to_return_;
  29. };
  30.  
  31. class ImplB : public InterfaceB, public ImplA {
  32.  public:
  33.   ImplB();
  34.   ~ImplB() override {}
  35.  
  36.   //int MethodOne() const override;
  37.   int MethodTwo() const override;
  38. };
  39.  
  40. ImplA::ImplA(int to_return) : to_return_(to_return) {}
  41. int ImplA::MethodOne() const { return to_return_; }
  42.  
  43. ImplB::ImplB() : ImplA(5) {}
  44. // int ImplB::MethodOne() const { return ImplA::MethodOne(); }
  45. int ImplB::MethodTwo() const { return 2; }
  46. }  // namespace simple
  47.  
  48.  
  49. int main() {
  50. 	simple::ImplA implA(100);
  51. 	cout << implA.MethodOne() << endl << endl;
  52.  
  53. 	simple::ImplB implB;
  54. 	cout << implB.MethodOne() << endl;
  55. 	cout << implB.MethodTwo() << endl;
  56.  
  57.  
  58. 	return 0;
  59. }
Success #stdin #stdout 0s 3460KB
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100

5
2
https://ideone.com/QVddjj
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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