Microsoft KB Archive/157479

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

Article ID: 157479

Article Last Modified on 7/13/2005

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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</li></ul>

 Microsoft Visual C++ 5.0 Professional Edition</li></ul>

 Microsoft Visual C++ 6.0 Professional Edition</li></ul>

 Microsoft Visual C++ 6.0 Standard Edition</li></ul>

 Microsoft Visual C++ .NET 2003 Standard Edition</li></ul>

 Microsoft Visual C++ .NET 2002 Standard Edition</li></ul> </li></ul>

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This article was previously published under Q157479

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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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Required header
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.

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

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


 * 1) pragma warning(disable: 4786)


 * 1) include
 * 2) include
 * 3) include
 * 4) include
 * 5) include

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

void main {

const int VECTOR_SIZE = 8 ;

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