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Tip of the Day
Language: C++
Expertise: Intermediate
Apr 14, 1999

Uses of Reverse Iterators

Reverse iterators are ordinary iterators except that they invert the semantic of the overloaded ++ and -- operators. They are useful when the elements of a container are accessed in reverse order. For example:
 
#include <iostream>
#include <vector>
#include <string>
using namespace std;
void ascending_order(vector <double> &v) {    
  //display elements of v in ascending order
  for (vector<double>::reverse_iterator rp = v.rbegin(); rp < v.rend(); rp++)
  {
    cout<< *rp<<endl;
  }
}
The member functions rbegin() and rend() (reverse begin() and reverse end()) are similar to begin() and end() except that they return reverse iterators, which apply to reverse sequences.
Danny Kalev
 
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