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How to use the rotate STL function in Visual C++

Article ID:157479
Last Review:July 13, 2005
Revision:4.0
This article was previously published under Q157479
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.
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SUMMARY

The sample code below illustrates how to use the rotate STL function in Visual C++.

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MORE INFORMATION

Required header

   <algorithm>
				
Prototype
   template<class ForwardIterator> inline
   void rotate(ForwardIterator first,

               ForwardIterator middle,
               ForwardIterator last)
				
Note The class/parameter names in the prototype do not match the version in the header file. Some have been modified to improve readability.

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Description

The rotate algorithm rotates the elements in the range [first, last), to the right by N positions, where N = middle - first.

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Sample code

////////////////////////////////////////////////////////////////////// 
// 
// Compile options needed: /GX
// 
// rotate.cpp : Illustrates how to use the rotate function.
// 
// Functions:
// 
//    rotate - Rotate the items in a sequence by n positions.
// 
// Written by Kalindi Sanghrajka
// of Microsoft Product Support Services,
// Software Core Developer Support.
// Copyright (c) 1996 Microsoft Corporation. All rights reserved.
////////////////////////////////////////////////////////////////////// 

// disable warning C4786: symbol greater than 255 character,
// okay to ignore

#pragma warning(disable: 4786)

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <functional>

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

void main()
{

    const int VECTOR_SIZE = 8 ;

    // Define a template class vector of strings
    typedef vector<string, allocator<string> > StrVector ;

    //Define an iterator for template class vector of strings
    typedef StrVector::iterator StrVectorIt ;

    StrVector Tongue_Twister(VECTOR_SIZE) ;

    StrVectorIt start, end, middle, it ;

    start = Tongue_Twister.begin() ;   // location of first
                                       // element of Tongue_Twister

    end = Tongue_Twister.end() ;       // one past the location last
                                       // element of Tongue_Twister

    //Initialize vector Tongue_Twister
    Tongue_Twister[0] = "she" ;
    Tongue_Twister[1] = "sells" ;
    Tongue_Twister[2] = "sea" ;
    Tongue_Twister[3] = "shells" ;
    Tongue_Twister[4] = "by";
    Tongue_Twister[5] = "the";
    Tongue_Twister[6] = "sea" ;
    Tongue_Twister[7] = "shore" ;

    middle = start + 3 ;  // start position for rotating elements

    cout << "Before calling rotate\n" << endl ;

    // print content of Tongue_Twister
    cout << "Try this Tongue Twister: " ;
    for(it = start; it != end; it++)
        cout << *it << " " ;
    cout << "\n\n" ;

    // rotate the items in the vector Tongue_Twister by 3 positions
    rotate(start, middle, end) ;

    cout << "After calling rotate \n" << endl ;

    // print content of Tongue_Twister
    cout << "Now try the rotated Tongue Twister: " ;
    for(it = start; it != end; it++)
        cout << *it << " " ;
    cout << "\n\n" ;
}
				
Program Output is:

Before calling rotate

Try this Tongue Twister: she sells sea shells by the sea shore

After calling rotate

Now try the rotated Tongue Twister: shells by the sea shore she sells sea

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REFERENCES

For more information about rotate, visit the following Microsoft Developer Network (MSDN) Web site:
http://msdn.microsoft.com/library/en-us/vclang98/html/sample_rotate_(STL_Sample).asp?frame=true (http://msdn.microsoft.com/library/en-us/vclang98/html/sample_rotate_(STL_Sample).asp?frame=true)

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APPLIES TO
The Standard C++ Library, when used with:
  Microsoft Visual C++ 4.2 Enterprise Edition
  Microsoft Visual C++ 5.0 Enterprise Edition
  Microsoft Visual C++ 6.0 Enterprise Edition
  Microsoft Visual C++ 4.2 Professional Edition
  Microsoft Visual C++ 5.0 Professional Edition
  Microsoft Visual C++ 6.0 Professional Edition
  Microsoft Visual C++ 6.0 Standard Edition
  Microsoft Visual C++ .NET 2003 Standard Edition
  Microsoft Visual C++ .NET 2002 Standard Edition

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Keywords: 
kbinfo kbtemplate kbstl kbcode KB157479

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