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  1. #include <iostream>
  2. #include <vector>
  3. #include <tuple>
  4. #include <cstdint>
  5.  
  6. template<class T> using Pair= std::tuple<T, T>;
  7. template<class T> using PType = std::vector<Pair<T>>;
  8. template<class T> using DType = std::vector<T>;
  9.  
  10. template<class T,class F>
  11. DType<T> overlappingPairsCollect(const DType<T>& D,const F& Fun) {
  12. 	PType<T> P;
  13.  
  14. 	T Head = D.front();
  15. 	for (std::size_t i = 1; i < D.size(); i++) {
  16. 		const T& Next = D[i];
  17. 		P.push_back({ Head,Next });
  18. 		Head = Next;
  19. 	}
  20. 	DType<T> R;
  21. 	for (auto& o : P) {
  22. 		R.push_back( Fun(std::get<0>(o), std::get<1>(o)));
  23. 	}
  24.  
  25. 	return R;
  26. }
  27.  
  28. template<class T,class F>
  29. DType<T> MakeHoge(const DType<T>& D,const F& Fun) {
  30. 	DType<T> R;
  31. 	for (std::size_t i = 0; i < D.size()-1; i++) {
  32. 		R.push_back(Fun(D[i], D[i + 1]));
  33. 	}
  34. 	return R;
  35. }
  36. int main() {
  37.  
  38. 	DType<std::int64_t> D{ 3,1,4,1,5,9,2,6,5 };
  39.  
  40. 	//auto R = overlappingPairsCollect(D, [](auto& A, auto& B) { return B - A; });
  41. 	auto R = MakeHoge(D, [](auto& A, auto& B) { return B - A; });
  42. 	for (auto& o : R) {
  43. 		std::cout << o << ',';
  44. 	}
  45. 	std::cout << std::endl;
  46.  
  47. 	return 0;
  48. }
Success #stdin #stdout 0s 4560KB
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Standard input is empty
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-2,3,-3,4,4,-7,4,-1,
https://ideone.com/d5aNNP
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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