Microsoft KB Archive/157433

= How to use the basic_string size and resize Standard Template Library (STL) functions in Visual C++ =

Article ID: 157433

Article Last Modified on 7/13/2005

-

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++ 4.2 Professional Edition

 Microsoft Visual C++ 5.0 Professional Edition</li></ul>

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

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

-

<div class="notice_section">

This article was previously published under Q157433

<div class="notice_section">

Note Microsoft Visual C++ .NET 2002 and Microsoft Visual C++ .NET 2003 support both the managed code model that is provided by the Microsoft .NET Framework and the unmanaged native Microsoft Windows code model. The information in this article applies only to unmanaged Visual C++ code.

<div class="summary_section">

SUMMARY
The sample code below illustrates how to use the basic_string size and resize STL function(s) in Visual C++.

<div class="moreinformation_section">

Prototype
size_type size const;

void resize(size_type n, E c = E); <pre class="fixed_text">  resize is defined in header xstring which is included indirectly. 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 size function returns the length of the sequence.

The resize function changes the size to the length specified by the first parameter. If the sequence is made longer, the function appends elements with the value of the second parameter. This value defaults to a null. The output of the sample code shows spaces for the null characters. operator<< reads the size of string and outputs each character in the string one at a time.

Sample code
////////////////////////////////////////////////////////////////////// // // Compile options needed: /GX // // : size.cpp // // Functions: // //   size //   resize ; Defined in header xstring which is included indirectly. // // Written by Linda Koontz // of Microsoft Product Support Services, // Copyright (c) 1996 Microsoft Corporation. All rights reserved. //////////////////////////////////////////////////////////////////////


 * 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

void main {

string TestString = "1111122222333334444455555"; cout << TestString << "\n size: " << TestString.size << endl; TestString.resize(5); cout << TestString << "\n size: " << TestString.size << endl; TestString.resize(10); cout << TestString << "\n size: " << TestString.size << endl; TestString.resize(15,'6'); cout << TestString << "\n size: " << TestString.size << endl;

} Output is: <pre class="fixed_text">1111122222333334444455555 size: 25 11111 size: 5 11111 size: 10 11111    66666  size: 15

<div class="references_section">