C++ std::reverse_copy with std::vector














































C++ std::reverse_copy with std::vector



Description:
This C++ article is about the reverse_copy () algorithm function with std::vector container.
It is an STL algorithm in <algorithm> header file. Copies the elements in the range [first,last) to                                              the range beginning at result, but in reverse order.

reverse_copy () has one definition:
template <class BidirectionalIterator, class OutputIterator>
  OutputIterator reverse_copy (BidirectionalIterator first,
                               BidirectionalIterator last, OutputIterator result);


Return type : An output iterator pointing to the end of the copied range, which contains                             
                     the same elements in reverse order.

Working: The reverse_copy( ) function takes 3 parameters, two iterators 'first' & 'last' and result .
               Forward iterators to the range from first to last, which contains all the elements between first and last.       
               Output iterator to initial position of the range where the resulting sequence is stored. 

Implementation: 

#include <iostream>             // std::cout
#include <algorithm>    // std::reverse_copy
#include <vector>       // std::vector

int main () {
  std::vector<int> element = {1,2,3,4,5,6,7,8,9,10};
  std::vector<int> element_size (element.size());
  // condition to reverse the vector
  auto it = std::reverse_copy (element.begin(), element.end(), element_size.begin());
  std::cout << "element contains:";
  for (int& x: element_size) std::cout << ' ' << x;
  std::cout << '\n';

  return 0;
}

Output:
element contains: 10 9 8 7 6 5 4 3 2 1


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