Microsoft KB Archive/156747

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

Article ID: 156747

Article Last Modified on 8/11/2005

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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 2002 Standard Edition</li></ul>

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

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This article was previously published under Q156747

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

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Prototype
template<class BidirectionalIterator> inline void reverse(BidirectionalIterator first,

BidirectionalIterator 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 reverse algorithm reverses the order of the elements in the range [first, last).

Sample Code
NOTE: In the first line of the sample code section, /GX is equivalent to /EHsc in VC++ .NET and is set by default. ////////////////////////////////////////////////////////////////////// // // Compile options needed: /GX // // reverse.cpp : Illustrates how to use the reverse function. // // Functions: // //   reverse - Reverse the items in a sequence. // // 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, 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" ;

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

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

// reverse the items in the vector Tongue_Twister reverse(start, end) ;

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

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

} Program Output is: <pre class="fixed_text">Before calling reverse

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

After calling reverse

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

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