STL Sample for the set::(rbegin, rend) Functions

• The Standard C++ Library included with: - Microsoft Visual C++, 32-bit Edition, version 4.2

SUMMARY

The following sample code illustrates how to use the set::rbegin and set::rend STL functions in Visual C++.

MORE INFORMATION

Required Header

   <set>

Prototype

   template<class _K, class _Pr, class _A>
   class set {
   public:
   // Function 1:
      const_reverse_iterator rbegin() const;
   // Function 2:
      const_reverse_iterator rend() const;
   }

Description

The rbegin function returns a reverse bidirectional iterator that points just beyond the end of the controlled sequence. The rend function returns a reverse bidirectional iterator that points at the first element of the sequence.

Sample Code

//////////////////////////////////////////////////////////////////////
//
// Compile options needed: -GX
//
// SetRbeginRend.cpp:
//      Illustrates how to use the rbegin function to get a reverse
//      bidirectional iterator that points just beyond the end of
//      the controlled sequence. It also illustrates how to use
//      the rend function to get a reverse bidirectional iterator
//      that points at the first element of the sequence.
//
// Functions:
//
//    rbegin      Returns a reverse bidirectional iterator that points
//                just beyond the end of the controlled sequence.
//    rend        Returns a reverse bidirectional iterator that points
//                at the first element of the sequence.
//
// Written by Derek Jamison
// of Microsoft Technical Support,
// Copyright (c) 1996 Microsoft Corporation. All rights reserved.
//////////////////////////////////////////////////////////////////////

#include <set>
#include <iostream>

void main() {
  SET_INT s1;
  SET_INT::reverse_iterator i;
  cout << "s1.insert(5)" << endl;
  s1.insert(5);
  cout << "s1.insert(10)" << endl;
  s1.insert(10);
  cout << "s1.insert(15)" << endl;
  s1.insert(15);
  cout << "s1.insert(20)" << endl;
  s1.insert(20);

  // displays: 20,15,10,5
  for (i=s1.rbegin();i!=s1.rend();i++)
     cout << "s1 has " << *i << " in its set." << endl;

Program Output

s1.insert(5) s1.insert(10) s1.insert(15) s1.insert(20) s1 has 20 in its set. s1 has 15 in its set. s1 has 10 in its set. s1 has 5 in its set.

REFERENCES

Visual C++ Books Online: Visual C++ Books; C/C++; Standard C++ Library Reference