Q156747: INFO: STL Sample for the reverse Function

Article: Q156747
Product(s): Microsoft C Compiler
Version(s): 4.2,5.0,6.0
Operating System(s): 
Keyword(s): kbcode kbVC420 kbVC500 kbVC600 kbDSupport
Last Modified: 26-MAR-2002

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The information in this article applies to:

- The Standard C++ Library, used with:
   - Microsoft Visual C++, 32-bit Enterprise Edition, versions 4.2, 5.0, 6.0 
   - Microsoft Visual C++, 32-bit Professional Edition, versions 4.2, 5.0, 6.0 
   - Microsoft Visual C++, 32-bit Learning Edition, version 6.0 
   - Microsoft Visual C++.NET (2002) 
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SUMMARY
=======

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

MORE INFORMATION
================

Required Header
---------------

     <algorithm>

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

  #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, 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:

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

REFERENCES
==========

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

Additional query words: STL STLSample reverse

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Keywords          : kbcode kbVC420 kbVC500 kbVC600 kbDSupport 
Technology        : kbVCsearch kbAudDeveloper kbVCNET kbVCLibrary
Version           : :4.2,5.0,6.0
Issue type        : kbinfo

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