public member function

std::operator+=

<iterator>
reverse_iterator& operator+= (difference_type n);
Advance iterator
Advances the reverse iterator by n element positions.

This in fact retrocedes by that same amount of element positions the base iterator kept internally.

Parameters

n
Number of elements to step over forwards.
difference_type is a member type defined as an alias of the base iterator's own difference type (generally, a integral type).

Return value

The reverse iterator itself (*this).

Example

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// reverse_iterator::operator+ example
#include <iostream>
#include <iterator>
#include <vector>
using namespace std;

int main () {
  vector<int> myvector;
  for (int i=0; i<10; i++) myvector.push_back(i);	// myvector: 0 1 2 3 4 5 6 7 8 9

  typedef vector<int>::iterator iter_int;

  reverse_iterator<iter_int> rev_iterator = myvector.rbegin();
  
  rev_iterator += 3;

  cout << "The fourth element from the end is : " << *rev_iterator << endl;

  return 0;
}


Output:

The fourth element from the end is : 6

See also