reverse_iterator::operator-=


public member function
reverse_iterator& operator-= (difference_type n);

Retrocede iterator

Moves the reverse iterator backwards by n element positions.

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

Parameters

n
Number of elements to step over backwards.
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

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
 
// 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.rend();
  
  rev_iterator -= 4;

  cout << "rev_iterator now points to: " << *rev_iterator << endl;

  return 0;
}


Output:

rev_iterator now points to: 3


See also

reverse_iterator::operator+= Advance iterator (public member function)
reverse_iterator::operator-- Decrease iterator position (public member function)
reverse_iterator::operator- Subtraction operator (public member function)