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  1. #include <iostream>
  2. #include <array>
  3. #include <algorithm>
  4.  
  5. const int N = 3;
  6. const int M = 5;
  7.  
  8. std::array<int, N+M> operator<<(const std::array<int, N> &one,
  9. 								const std::array<int, M> &two)
  10. {
  11.     std::array<int, N+M> result;
  12.  
  13.     // copy first part to the new array
  14.     auto endOfFirst = std::copy(std::cbegin(one),
  15.     							std::cend(one),
  16.     							std::begin(result));
  17.  
  18.     // copy a rest of elements from second array
  19.     std::copy(std::cbegin(two),
  20.     		  std::cend(two),
  21.     		  endOfFirst);
  22.  
  23. 	// sort results
  24.     std::sort(std::begin(result),std::end(result));
  25.     return result;
  26. }
  27.  
  28. // needed to support "a << b" and "b << a"
  29. std::array<int, N+M> operator<<(const std::array<int, M> &one,
  30. 								const std::array<int, N> &two)
  31. {
  32. 	return operator<<(two, one);
  33. }
  34.  
  35. int main() {
  36. 	std::array<int, N> a = {1, 2, 3};
  37. 	std::array<int, M> b = {8, 7, 6, 5, 4};
  38.  
  39. 	auto result = b << a; // the type is std::array<int, N+M>
  40.  
  41. 	for (auto item : result) {
  42. 		std::cout << item << "|";
  43. 	}
  44.  
  45. 	return 0;
  46. }
Success #stdin #stdout 0s 15240KB
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1|2|3|4|5|6|7|8|
https://ideone.com/0wjcQF
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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