DOCUMENT:Q156898  27-MAR-2002  [visualc]
TITLE   :STL Sample for deque::assign and deque::swap Functions
PRODUCT :Microsoft C Compiler
PROD/VER::4.2,5.0,6.0
OPER/SYS:
KEYWORDS:kbcode kbVC420 kbVC500 kbVC600 kbDSupport

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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 deque::assign, deque::swap,
deque::end, and deque::begin STL functions in Visual C++.

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

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

      < deque>

Prototype
---------

      void assign(const_iterator first, const_iterator last);
      void assign(size_type n, const T& x = T());
      void swap(deque& dq);

NOTE: The class/parameter names in the prototype may not match the version in the
header file. Some have been modified to improve readability.

Description
-----------

The first assign member function replaces the sequence controlled by *this with
the sequence [first, last). The second assign member function replaces the
sequence controlled by *this with a repetition of n elements of value x.

The swap member function swaps the contents between *this and dq.

Sample Code
-----------

   ////////////////////////////////////////////////////////////////////// 
   // 
   // Compile options needed: -GX
   // 
   // deque.cpp :
   // 
   // Functions:
   // 
   //    assign
   //    swap
   //    begin
   //    end
   // 
   // 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<char, allocator<char> >  CHARDEQUE;

   void print_contents (CHARDEQUE  deque, char*);

   void main()

   {

       //create a  with  3 A's
       CHARDEQUE  a(3,'A');

       //create b with 4 B's.
       CHARDEQUE  b(4,'B');

       //print out the contents
       print_contents (a,"a");
       print_contents (b,"b");

       //swap a and b
       a.swap(b);
       print_contents (a,"a");
       print_contents (b,"b");

       // let us swap it back
           a.swap(b);
       print_contents (a,"a");
       print_contents (b,"b");

       //assign the contents of b to a
       a.assign(b.begin(),b.end());
       print_contents (a,"a");

       //assign the first two items of b to a
       a.assign(b.begin(),b.begin()+2);
       print_contents (a,"a");

       //assign 3 'Z's to a
       a.assign(3,'Z');
       print_contents (a,"a");

       }

   //function to print the contents of deque
   void print_contents (CHARDEQUE  deque, char *name)

   {

       CHARDEQUE::iterator pdeque;

       cout <<"The contents of "<< name <<" : ";

           for(pdeque = deque.begin();
           pdeque != deque.end();
           pdeque++)
       {
           cout << *pdeque <<" " ;
       }
           cout<<endl;

   }

Program Output is:

The contents of a : A A A
The contents of b : B B B B
The contents of a : B B B B
The contents of b : A A A
The contents of a : A A A
The contents of b : B B B B
The contents of a : B B B B
The contents of a : B B
The contents of a : Z Z Z

REFERENCES
==========

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

Additional query words: STL STLSample assign swap end begin kbSTL kbTemplate

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

=============================================================================

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