Microsoft KB Archive/158579

= How to use the set::size STL function in Visual C++ =

Article ID: 158579

Article Last Modified on 8/11/2005

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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 Q158579

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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.

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SUMMARY
The following sample code illustrates how to use the set::size Standard Template Library (STL) function in Visual C++.

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Prototype
template<class _K, class _Pr, class _A> class set { public: // Function 1:

size_type size 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 size function is used to determine the number of elements in the controlled sequence.

Sample Code
////////////////////////////////////////////////////////////////////// // // Compile options needed: -GX // // SetSize.cpp: //     Illustrates how to use the size function to determine how //     many elements are in the controlled sequence. // // Functions: // //   size         Returns the number of elements in the controlled //                sequence. // // Written by Derek Jamison // of Microsoft Technical Support, // Copyright (c) 1996 Microsoft Corporation. All rights reserved. //////////////////////////////////////////////////////////////////////


 * 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 set<int,less ,allocator > SET_INT;

void main {

SET_INT s1;

cout << "s1.size returned "; cout << s1.size << endl; // 0

cout << "s1.insert(5)" << endl; s1.insert(5); cout << "s1.insert(8)" << endl; s1.insert(8); cout << "s1.insert(12)" << endl; s1.insert(12);

cout << "s1.size returned "; cout << s1.size << endl; // 3 }

Program Output
s1.size returned 0 s1.insert(5) s1.insert(8) s1.insert(12) s1.size returned 3

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