Microsoft KB Archive/156590

= How to use the deque::erase, deque::clear, deque::begin, and deque::end Standard Template Library (STL) functions in Visual C++ =

Article ID: 156590

Article Last Modified on 8/11/2005

-

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>

-

<div class="notice_section">

This article was previously published under Q156590

<div class="summary_section">

SUMMARY
The sample code below illustrates how to use the deque::erase, deque::clear, deque::begin, and deque::end STL functions in Visual C++.

<div class="moreinformation_section">

Prototype
iterator erase(iterator iter); iterator erase(iterator first, iterator last); void clear const; 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 erase member function removes the element of the container pointed to by iter. The second erase member function removes the elements of the container in the range [first, last). Both return an iterator that designates the first element remaining beyond any elements removed, or end if no such element exists.

Removing N elements causes N destructor calls and an assignment for each of the elements between the insertion point and the nearer end of the sequence.

Removing an element at either end invalidates only iterators and references that designate the erased elements. Otherwise, erasing an element invalidates all iterators and references.

The clear member function calls erase( begin, end).

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 // // deque.cpp : // // Functions: // //   erase //   clear //   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<int, allocator > INTDEQUE;

void print_contents (INTDEQUE deque);

void main

{

// create a and with elements 1,2,3,4 and 5 INTDEQUE a;    a.push_back(1); a.push_back(2); a.push_back(3); a.push_back(4); a.push_back(5);

//print the contents print_contents (a);

// erase the second element a.erase(a.begin+1); print_contents (a);

//erase the last two elements a.erase(a.end-2,a.end); print_contents (a);

//clear a   a.clear; print_contents (a);

}

void print_contents (INTDEQUE deque) { INTDEQUE::iterator pdeque;

cout <<"The output is: ";

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

} Program Output is: <pre class="fixed_text">The output is: 1 2 3 4 5 The output is: 1 3 4 5 The output is: 1 3 The output is:

<div class="references_section">