reverse_iterator::operator+=

Adds a specified offset from a reverse_iterator.

reverse_iterator<RandomIterator>& operator+=(
   difference_type _Off
);

Parameters

• _Off
  The offset by which to increment the iterator.

Return Value

A reference to the element addressed by the reverse_iterator.

Example

// reverse_iterator_op_addoff.cpp
// compile with: /EHsc
#include <iterator>
#include <vector>
#include <iostream>

int main( )
{
   using namespace std;
   int i;

   vector<int> vec;
   for (i = 1 ; i < 6 ; ++i ) 
   {
      vec.push_back ( 2 * i );
   }
   
   vector <int>::iterator vIter;

   cout << "The vector vec is: ( ";
   for ( vIter = vec.begin( ) ; vIter != vec.end( ); vIter++)
      cout << *vIter << " ";
   cout << ")." << endl;

   vector <int>::reverse_iterator rvIter;
   cout << "The vector vec reversed is: ( ";
   for ( rvIter = vec.rbegin( ) ; rvIter != vec.rend( ); rvIter++)
      cout << *rvIter << " ";
   cout << ")." << endl;

   // Initializing reverse_iterators to the last element
   vector <int>::reverse_iterator rVPOS1 = vec.rbegin ( );
   
   cout << "The iterator rVPOS1 initially points to the first "
        << "element\n in the reversed sequence: "
        << *rVPOS1 << "." << endl;

   rVPOS1+=2;   // addition of an offset
   cout << "After the +2 offset, the iterator rVPOS1 now points\n"
        << " to the third element in the reversed sequence: "
        << *rVPOS1 << "." << endl;
}

The vector vec is: ( 2 4 6 8 10 ).
The vector vec reversed is: ( 10 8 6 4 2 ).
The iterator rVPOS1 initially points to the first element
 in the reversed sequence: 10.
After the +2 offset, the iterator rVPOS1 now points
 to the third element in the reversed sequence: 6.

Requirements

Header: <iterator>

Namespace: std

See Also

Concepts

reverse_iterator Class

reverse_iterator Members

Standard Template Library