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  1. #include <iostream>
  2. #include <algorithm>
  3. using namespace std;
  4.  
  5. class CompareOptionalInfo {};
  6. class CompareResult
  7. {
  8. public:
  9.   CompareResult(double d=0.0) : confidence_(d) {}; 
  10.   operator double() { cout<<"(dbl conversion was used)"<<endl; return confidence_; }
  11.   operator bool() { cout<<"(bool conversion was used)"<<endl; return confidence_>0.5; }	
  12.   bool operator< (const CompareResult& x) const { return confidence_<x.confidence_; }
  13. private:
  14.   double confidence_;
  15.   CompareOptionalInfo compare_optional_info_;
  16. };
  17.  
  18. struct Foo
  19. {
  20. 	double d; 
  21.     static CompareResult Compare(const Foo& foo1, const Foo& foo2) { if (foo1.d==foo2.d) return true; else return 1.0/(foo1.d-foo2.d); }
  22. };
  23.  
  24.  
  25. int main() {
  26. 	Foo f1,f2,f3; 
  27. 	f1.d =1.3; f2.d=1.4; f3.d=5.0; 
  28. 	auto result = Foo::Compare (f1, f2);
  29. 	if (result) cout << "similar"; 
  30. 	if ((double)result>0.0) cout << "not fully different"; 
  31. 	auto closest = std::max(Foo::Compare (f1, f2), Foo::Compare (f2, f3)); 
  32. 	cout << "closest:"<<(double)closest<<endl; 
  33.  
  34. 	return 0;
  35. }
Success #stdin #stdout 0s 3468KB
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Standard input is empty
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(bool conversion was used)
(dbl conversion was used)
(dbl conversion was used)
closest:-0.277778
https://ideone.com/XngYh9
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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