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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. template<typename T>
  5. struct bool_context {
  6. 	friend T operator&&(T const & lhs, bool rhs) {
  7. 		return lhs && T(rhs);
  8. 	}
  9. 	friend T operator&&(bool lhs, T const & rhs) {
  10. 		return T(lhs) && rhs;
  11. 	}
  12. 	friend T operator||(T const & lhs, bool rhs) {
  13. 		return lhs || T(rhs);
  14. 	}
  15. 	friend T operator||(bool lhs, T const & rhs) {
  16. 		return T(lhs) || rhs;
  17. 	}
  18. };
  19.  
  20. struct my_bool : bool_context<my_bool> {
  21. 	bool value;
  22. 	my_bool(bool v) : value(v) {}
  23. 	explicit operator bool() { return value; };
  24. 	friend my_bool operator&&(my_bool const & lhs, my_bool const & rhs) {
  25. 		cout << "my_bool::operator&&" << endl;
  26. 		return lhs.value && rhs.value;
  27. 	}
  28. 	friend my_bool operator||(my_bool const & lhs, my_bool const & rhs) {
  29. 		cout << "my_bool::operator||" << endl;
  30. 		return lhs.value || rhs.value;
  31. 	}
  32. };
  33.  
  34.  
  35. int main(int, char**) {
  36. 	my_bool a = true;
  37. 	bool b = false;
  38. 	cout << "a && b => "; a && b;
  39. 	cout << "b && a => "; b && a;
  40. 	cout << "a && a => "; a && a;
  41. 	cout << "b && b => "; b && b; cout << endl;
  42. 	cout << "a || b => "; a || b;
  43. 	cout << "b || a => "; b || a;
  44. 	cout << "a || a => "; a || a;
  45. 	cout << "b || b => "; b || b; cout << endl;
  46. 	return 0;
  47. }
Success #stdin #stdout 0s 3460KB
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Standard input is empty
stdout
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a && b => my_bool::operator&&
b && a => my_bool::operator&&
a && a => my_bool::operator&&
b && b => 
a || b => my_bool::operator||
b || a => my_bool::operator||
a || a => my_bool::operator||
b || b =>
https://ideone.com/V2dVza
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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