How to use the set::rbegin and set::rend STL functions in Visual C++ (158578)


The information in this article applies to:

  • The Standard C++ Library, when used with:
    • Microsoft Visual C++, 32-bit Enterprise Edition 4.2
    • Microsoft Visual C++, 32-bit Enterprise Edition 5.0
    • Microsoft Visual C++, 32-bit Enterprise Edition 6.0
    • Microsoft Visual C++, 32-bit Professional Edition 4.2
    • Microsoft Visual C++, 32-bit Professional Edition 5.0
    • Microsoft Visual C++, 32-bit Professional Edition 6.0
    • Microsoft Visual C++, 32-bit Learning Edition 6.0
    • Microsoft Visual C++ 2005 Express Edition
    • Microsoft Visual C++ .NET (2003)
    • Microsoft Visual C++ .NET (2002)
This article was previously published under Q158578
Note Microsoft Visual C++ .NET 2002 and Microsoft Visual C++ .NET 2003 support both the managed code model that is provided by the Microsoft .NET Framework and the unmanaged native Microsoft Windows code model. The information in this article applies only to unmanaged Visual C++ code. Microsoft Visual C++ 2005 supports both the managed code model that is provided by the Microsoft .NET Framework and the unmanaged native Microsoft Windows code model.

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;
   }
NOTE: The class/parameter names in the prototype may not match the version in the header file. Some have been modified to improve readability.

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.
////////////////////////////////////////////////////////////////////// 

#pragma warning(disable:4786)

#include <set>
#include <iostream>

#if _MSC_VER > 1020   // if VC++ version is > 4.2
   using namespace std;  // std c++ libs implemented in std
   #endif

typedef set<int,less<int>,allocator<int> > SET_INT;

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
Modification Type:MajorLast Reviewed:1/11/2006
Keywords:kbhowto kbcode kbinfo kbSTL kbtemplate KB158578 kbAudDeveloper
©2004 Microsoft Corporation. All rights reserved.