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  1. #include <cstdlib>
  2. #include <iostream>
  3.  
  4. //////////////////////////////////////////////////////////////////////////////////
  5.  
  6. struct Base1
  7. {
  8. 	Base1( unsigned& val ) : m_val( val ){}
  9. 	bool operator==( const Base1& rhs )const { return m_val == rhs.m_val; }
  10. 	unsigned& m_val;
  11. };
  12.  
  13. //////////////////////////////////////////////////////////////////////////////////
  14.  
  15. struct Base2
  16. {
  17. 	Base2( unsigned& val ) : m_val( val ){}
  18. 	bool operator==( const Base2& rhs ) const { return m_val == rhs.m_val; }
  19. 	unsigned& m_val;
  20. };
  21.  
  22. //////////////////////////////////////////////////////////////////////////////////
  23.  
  24. class Derived : public Base1 , public Base2		// Real problem has many more more Base classes
  25. {
  26. public:
  27. 	Derived( unsigned& val1 , unsigned& val2 ) : Base1( val1 ) , Base2( val2 )
  28. 	{
  29. 	}
  30.  
  31. 	bool operator==( const Derived& rhs ) const	// How to generalize this 
  32. 	{
  33. 		const Base1& rhsBase1 = rhs;
  34. 		const Base2& rhsBase2 = rhs;
  35.  
  36. 		const Base1& thisBase1 = *this;
  37. 		const Base2& thisBase2 = *this;
  38.  
  39. 		return ( thisBase1 == rhsBase1 ) && ( thisBase2 == rhsBase2 );
  40. 	}
  41. };
  42.  
  43. //////////////////////////////////////////////////////////////////////////////////
  44.  
  45. int main()
  46. {
  47. 	unsigned val1 = 42 , val2 = 24 , val3 = 0;
  48. 	Derived d1( val1 , val2 );
  49. 	Derived d2( val1 , val3 );
  50.  
  51. 	std::cout << ( d1 == d2 ) << std::endl;
  52. 	return EXIT_SUCCESS;
  53. }
  54.  
  55. //////////////////////////////////////////////////////////////////////////////////
Success #stdin #stdout 0s 3340KB
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https://ideone.com/FDYuO6
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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