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  1. #include <iostream>
  2. #include <vector>
  3. #include <iterator>
  4.  
  5. template<typename It>
  6. class Range
  7. {
  8.     It b, e;
  9. public:
  10.     Range(It b, It e) : b(b), e(e) {}
  11.     It begin() const { return b; }
  12.     It end() const { return e; }
  13. };
  14.  
  15. template<typename ORange, typename OIt = decltype(std::begin(std::declval<ORange>())), typename It = std::reverse_iterator<OIt>>
  16. Range<It> reverse(ORange && originalRange) {
  17.     return Range<It>(It(std::end(originalRange)), It(std::begin(originalRange)));
  18. }
  19.  
  20. int main() {
  21. 	std::vector<int> c = { 1, 2, 3, 4 };
  22. 	for (auto i : reverse(c)) {
  23. 		std::cout << i << ' ';
  24. 	}
  25. 	std::cout << std::endl;
  26.  
  27. 	// Also works with const containers
  28. 	const std::vector<int> cc = { 1, 2, 3, 4 };
  29. 	for (auto i : reverse(cc)) {
  30. 		std::cout << i << ' ';
  31. 	}
  32. 	std::cout << std::endl;
  33.  
  34. 	// Also works with raw arrays thanks to non-members std::begin/end
  35. 	int arr[] = { 1, 2, 3, 4 };
  36. 	for (auto i : reverse(arr)) {
  37. 		std::cout << i << ' ';
  38. 	}
  39. 	std::cout << std::endl;
  40.  
  41. 	return 0;
  42. }
Success #stdin #stdout 0s 3428KB
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stdin
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Standard input is empty
stdout
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4 3 2 1 
4 3 2 1 
4 3 2 1
https://ideone.com/49MORg
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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