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  1. #include <iostream>
  2. #include <limits>
  3. using namespace std;
  4.  
  5. class baseC {
  6. protected:
  7. 	char _data[8];
  8. 	int index;
  9. 	public:
  10.  
  11. 	void operator=(const int setValue) {
  12. 		if(setValue >= (unsigned)std::numeric_limits<char>::max()) {
  13. 			cout << "Unallowed value" << endl;
  14. 			return;
  15. 		}
  16. 		cout << "operator= with setValue " << setValue << " and index " << index << endl;
  17. 		_data[index+1] = setValue;
  18. 	}
  19.  
  20. 	operator int(){
  21. 		cout << "operator int with index " << index << endl;
  22. 		return _data[index-1];
  23. 	}
  24.  
  25. 	baseC() {} // Only instantiable via derived class
  26. };
  27.  
  28. class C : public baseC {
  29. public :
  30.     char getItem(const int index) const {return _data[index-1];}
  31.     void setItem(const int index){_data[index+1] = 1;}
  32.  
  33.     baseC& operator[](const int index) {
  34.     	cout << "operator[] with index " << index << endl;
  35.     	this->index = index;
  36.     	return static_cast<baseC&>(*this);
  37.     }
  38.  
  39. };
  40.  
  41. int main() {
  42. 	C obj;
  43.  
  44. 	obj[0] = 0x22;
  45. 	cout << (int)obj[2];
  46.  
  47. 	return 0;
  48. }
Success #stdin #stdout 0s 3296KB
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Standard input is empty
stdout
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operator[] with index 0
operator= with setValue 34 and index 0
operator[] with index 2
operator int with index 2
34
https://ideone.com/pQYJ5A
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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