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  1. #include <memory>
  2. #include <iostream>
  3. #include <ostream>
  4.  
  5. class BaseClass
  6. {
  7. public:
  8. 	int a;
  9. 	virtual ~BaseClass() {};
  10.  
  11. 	bool operator==( const BaseClass& right ) const
  12. 	{
  13. 		return typeid(*this) == typeid(right) && 
  14. 			   a == right.a;
  15. 	}
  16. };
  17.  
  18. class DerivedClass : public BaseClass
  19. {
  20. public:
  21. 	int x;
  22.  
  23. 	bool operator==( const DerivedClass& right ) const
  24. 	{
  25. 		return BaseClass::operator==(right) && 
  26. 			   x == right.x;
  27. 	}
  28. };
  29.  
  30. int main()
  31. {
  32. 	auto obj = std::make_shared<BaseClass>();
  33. 	auto obj2 = std::make_shared<BaseClass>();
  34. 	obj->a = 100;
  35. 	obj2->a = 100;
  36. 	auto result = *obj == *obj2;
  37. 	std::cout << "1: BaseClass(100) == BaseClass(100): " << result << std::endl;
  38.  
  39. 	obj2->a = 1000;
  40. 	result = *obj == *obj2;
  41. 	std::cout << "2: BaseClass(100) == BaseClass(1000): " << result << std::endl;
  42.  
  43. 	obj2 = std::make_shared<DerivedClass>();
  44. 	result = *obj == *obj2;
  45. 	std::cout << "3: BaseClass == DerivedClass: " << result << std::endl;
  46. }
Success #stdin #stdout 0s 3024KB
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stdin
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Standard input is empty
stdout
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1: BaseClass(100) == BaseClass(100): 1
2: BaseClass(100) == BaseClass(1000): 0
3: BaseClass == DerivedClass: 0
https://ideone.com/fIAmB
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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