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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. template<typename T, typename U>
  6. bool isOneOf(T a, U b) {
  7.     return a == b;
  8. }
  9.  
  10. template<typename T, typename U, typename ... Args>
  11. bool isOneOf(T a, U b, Args ... args) {
  12.     return isOneOf(a, b) || isOneOf(a, args...);
  13. }
  14.  
  15. class Checker {
  16. 	int checks;
  17. 	int value;
  18. public:
  19. 	Checker(int value) {
  20. 		this->checks = 0;
  21. 		this->value = value;
  22. 	}
  23. 	int getValue() {
  24. 		checks += 1;
  25. 		return value;
  26. 	}
  27. 	int getChecks() {
  28. 		return checks;
  29. 	}
  30. };
  31.  
  32. int main() {
  33. 	Checker c(1);
  34. 	if (isOneOf(c.getValue(), 2, 3, 1, 4, 5))
  35. 		cout << "true" << endl;
  36. 	cout << "checks: " << c.getChecks() << endl;
  37. 	return 0;
  38. }
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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true
checks: 1
https://ideone.com/ToMuUe
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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