Microsoft KB Archive/158620

= How to use the vector::push_back and vector::pop_back Standard Template Library (STL) functions in Visual C++ =

Article ID: 158620

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 2002 Standard Edition</li></ul> </li> Microsoft Visual C++ .NET 2003 Standard Edition</li></ul>

-

<div class="notice_section">

This article was previously published under Q158620

<div class="notice_section">

NOTE: Microsoft Visual C++ NET (2002) supported both the managed code model that is provided by the .NET Framework and the unmanaged native Windows code model. The information in this article applies to unmanaged Visual C++ code only.

<div class="summary_section">

SUMMARY
The following sample code illustrates how to use the vector::push_back and vector::pop_back STL functions in Visual C++.

<div class="moreinformation_section">

Prototypes
template<class _TYPE, class _A> void vector::push_back(const _TYPE& X);

template<class _TYPE, class _A> void vector::pop_back; 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 sample declares an empty vector of integers. It adds three integers to the vector, and then deletes one. Finally, it generates the remaining elements in the vector.

Sample Code
////////////////////////////////////////////////////////////////////// // // Compile options needed: /GX // // Pushpop.cpp: Illustrates how to use the push and pop member //             functions of the vector container. // // Functions: // //   vector::push_back - Appends (inserts) an element to the end of a //                        vector, allocating memory for it if necessary. // //   vector::pop_back -  Erases the last element of the vector. // //   vector::begin - Returns an iterator to start traversal of the vector. // //   vector::end - Returns an iterator for the last element of the vector. // //   vector::iterator - Traverses the vector. // // Written by Tom Campbell // of Microsoft Corporation // Copyright (c) 1996 Microsoft Corporation. All rights reserved. //////////////////////////////////////////////////////////////////////

// The debugger can't handle symbols more than 255 characters long. // STL often creates symbols longer than that. // When symbols are longer than 255 characters, the warning is disabled.


 * 1) pragma warning(disable:4786)


 * 1) include
 * 2) include

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

typedef vector<int, allocator > INTVECTOR;

void main

{

// Dynamically allocated vector begins with 0 elements. INTVECTOR theVector;

// Iterator is used to loop through the vector. INTVECTOR::iterator theIterator;

// Add one element to the end of the vector, an int with the value 42. // Allocate memory if necessary. theVector.push_back(42) ;

// Add two more elements to the end of the vector. // theVector will contain [ 42, 1, 109 ]. theVector.push_back(1) ; theVector.push_back(109) ;

// Erase last element in vector. theVector.pop_back;

// Output contents of theVector. Shows [ 42, 1 ] cout << "theVector [ " ; for (theIterator = theVector.begin; theIterator != theVector.end;        theIterator++) {       cout << *theIterator; if (theIterator != theVector.end-1) cout << ", "; // cosmetics for the output }   cout << " ]" << endl ;

}

Program Output
theVector [ 42, 1 ]

<div class="references_section">