INFO: STL Sample for deque::rbegin and deque::rend Functions

ID: Q156592

The information in this article applies to:

The Standard C++ Library, used with:
- Microsoft Visual C++, 32-bit Editions, versions 4.2, 5.0, 6.0

SUMMARY

The sample code below illustrates how to use the deque::rbegin, deque::rend, and deque::push_back STL functions in Visual C++.

MORE INFORMATION

Required Header


   < deque>

Prototype


   const_reverse_iterator rbegin() const;
   reverse_iterator rbegin();

   const_reverse_iterator rend() const;
   reverse_iterator rend();

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 member function returns a reverse iterator that points just beyond the end of the controlled sequence. Therefore, it designates the beginning of the reverse sequence.

The rend member function returns a reverse iterator that points at the first element of the sequence, or just beyond the end of an empty sequence. Therefore, it designates the end of the reverse sequence.

Sample Code


////////////////////////////////////////////////////////////////////// 
// 
// Compile options needed: -GX
// 
// deque.cpp :
// 
// Functions:
// 
//    rbegin
//    rend
//    push_back
// 
// Written by Bobby Mattappally
// of Microsoft Product Support Services,
// Copyright (c) 1996 Microsoft Corporation. All rights reserved.
////////////////////////////////////////////////////////////////////// 

/* Compile options needed:-GX
*/ 
#include <iostream>
#include <deque>

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

typedef deque<int, allocator<int> >  INTDEQUE;

void main()

{

    // Create A and fill it with elements 1,2,3,4 and 5
    // using push_back function

    INTDEQUE  A;
    A.push_back(1);
    A.push_back(2);
    A.push_back(3);
    A.push_back(4);
    A.push_back(5);

    // Now print the contents in reverse order using reverse_iterator
    // and functions rbegin() and rend()

    INTDEQUE::reverse_iterator rpi;

    for(rpi= A.rbegin();  rpi !=A.rend(); rpi++)
    {
        cout << *rpi <<" " ;
    }
        cout<<endl;

}

Program Output is:


5 4 3 2 1

REFERENCES

Visual C++ Books On Line: Visual C++ Books:C/C++:Standard C++ Library Reference.

Additional query words: STL STLSample rbegin rend reverse_iterator push_back

Keywords : kbcode kbVC420 kbVC500 kbVC600 kbDSupport STLIss
Version : winnt:4.2,5.0,6.0
Platform : winnt
Issue type : kbinfo