Q163359: HOWTO: STL Sample for list::size,list::resize Functions

Article: Q163359
Product(s): Microsoft C Compiler
Version(s): 4.2,5.0,6.0
Operating System(s): 
Keyword(s): kbcode kbVC420 kbVC500 kbVC600 kbDSupport
Last Modified: 26-MAR-2002

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The information in this article applies to:

- The Standard C++ Library, included 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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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.

SUMMARY
=======

The sample code below illustrates how to use the list::max_size, list::size,
list::resize STL functions in Visual C++.

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

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

     <list>
     <string>
     <iostream>

Prototype
---------

     size_type max_size() const;
     size_type size() const;
     void resize(size_type n, T x = T());

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 member function max_size returns the length of the longest sequence that the
object can control. The member function size returns the length of the
controlled sequence. The member function resize ensures that size() henceforth
returns n. If the member function resize must make the controlled sequence
longer, it appends elements with the value x.

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

  ////////////////////////////////////////////////////////////////////// 
  // 
  // Compile options needed: -GX
  // 
  // size.cpp :  This example shows how to resize a list<T>.  It also
  //             uses list::size() and list::max_size().
  // 
  //  Functions
  //  ---------
  // 
  //  list::size
  //  list::resize
  //  list::max_size
  // 
  // Written by Andrew Bradnan
  // Copyright (c) 1996 Microsoft Corporation. All rights reserved.
  ////////////////////////////////////////////////////////////////////// 

      #include <list>
      #include <string>
      #include <iostream>
      
     #if _MSC_VER > 1020   // if VC++ version is > 4.2
     using namespace std;  // std c++ libs implemented in std
     #endif

      typedef list<string, allocator<string> > LISTSTR;

      void main()
      {
         LISTSTR test;
         LISTSTR::iterator i;

         cout << "max_size() = " << test.max_size() << endl;

         test.insert(test.begin(), 10, "test");

         cout << "There are " << test.size() << " elements." << endl;
         // test test test test test test test test test test
         for (i = test.begin(); i != test.end(); ++i)
            cout << *i << " ";
         cout << endl;

         // Make it smaller
         test.resize(5);
         cout << "There are " << test.size() << " elements." << endl;
         // test test test test test
         for (i = test.begin(); i != test.end(); ++i)
            cout << *i << " ";
         cout << endl;

         // Make it bigger
         test.resize(10, "bigger");
         // test test test test test bigger bigger bigger bigger bigger
         cout << "There are " << test.size() << " elements." << endl;
         for (i = test.begin(); i != test.end(); ++i)
            cout << *i << " ";
         cout << endl;

         test.clear();
         cout << "There are " << test.size() << " elements." << endl;
      }

The Program Output is:

      max_size() = 268435455
      There are 10 elements.
      test test test test test test test test test test
      There are 5 elements.
      test test test test test
      There are 10 elements.
      test test test test test bigger bigger bigger bigger bigger
      There are 0 elements.

REFERENCES
==========

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

Additional query words: STL STLSample list max_size size resize clear kbSTL

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

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