How to use the "deque::rbegin" STL function, the "deque::rend" STL function, and the "deque::push_back" STL function in Visual C++

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This article was previously published under Q156592

SUMMARY

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

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MORE INFORMATION

Required Header

   < deque>

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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.

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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.

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Sample Code

NOTE: In the first line of the sample code section, /GX is equivalent to /EHsc in Visual C++ .NET and in Visual C++ 2005 and is set by default.

////////////////////////////////////////////////////////////////////// 
// 
// 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: