Microsoft KB Archive/156898

= INFO: STL Sample for deque:: assign and deque::swap Functions =

Article ID: 156898

Article Last Modified on 9/16/2003

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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 Q156898

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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++.

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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
 * 1) include
 * 2) include
 * 1) include

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

typedef deque<char, allocator > 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: <pre class="fixed_text">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

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