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  1. #include <iostream>
  2. #include <functional>
  3. #include <vector>
  4. #include <set>
  5. #include <string>
  6.  
  7. template<typename T, typename U>
  8. std::pair<typename T::value_type, bool> foo(T const&, U const&);
  9.  
  10. int main() {
  11. 	typedef std::vector<std::vector<std::string> > vec;
  12. 	vec v { { "1", "2", "3" }, { "3", "2", "1" } };
  13. 	for(int i = 0 ; i < 3 ; ++i) {
  14. 		auto result = foo(v, [&i](vec::value_type const& lhs, vec::value_type const& rhs) -> bool {
  15. 				return lhs[i] < rhs[i];
  16. 		});
  17.  
  18. 		if(result.second)
  19. 			std::cout << *std::begin(result.first);
  20. 	}
  21.  
  22. 	return 0;
  23. }
  24.  
  25. template<typename T, typename U>
  26. std::pair<typename T::value_type, bool> foo(T const& v, U const& f)
  27. {
  28. 	std::set<typename T::value_type, U> s(f);
  29. 	for(auto const& e : v)
  30. 		s.insert(e);
  31.  
  32. 	if(s.size())
  33. 		return std::make_pair(*std::begin(s), true);
  34. 	else
  35. 		return std::make_pair(typename T::value_type(), false);
  36. }
  37.  
Success #stdin #stdout 0s 3476KB
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https://ideone.com/QNIrI3
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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