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Observing the world - how to build a reuseable implementation of a design pattern

, 11 Jun 2001
An article about the techniques to pour reusable design (a design pattern) into reusable code with an example of the observer pattern.
// Observer_Demo.cpp : Defines the class behaviors for the application.
//

#include "stdafx.h"
#include "Observer_Demo.h"
#include "Observer_DemoDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CApp

BEGIN_MESSAGE_MAP(CApp, CWinApp)
	//{{AFX_MSG_MAP(CApp)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}AFX_MSG
	ON_COMMAND(ID_HELP, CWinApp::OnHelp)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CApp construction

CApp::CApp()
	: m_OutStreambuf( m_OutLogger )
{
	// Redirect std::cout to the dialogs edit control
	std::cout.rdbuf( &m_OutStreambuf );
}

/////////////////////////////////////////////////////////////////////////////
// The one and only CApp object

CApp theApp;
/////////////////////////////////////////////////////////////////////////////
// CApp initialization

BOOL CApp::InitInstance()
{
	// Standard initialization
	// If you are not using these features and wish to reduce the size
	//  of your final executable, you should remove from the following
	//  the specific initialization routines you do not need.

	CMainDlg dlg;
	m_pMainWnd = &dlg;
	int nResponse = dlg.DoModal();
	if (nResponse == IDOK)
	{
		// TODO: Place code here to handle when the dialog is
		//  dismissed with OK
	}
	else if (nResponse == IDCANCEL)
	{
		// TODO: Place code here to handle when the dialog is
		//  dismissed with Cancel
	}

	// Since the dialog has been closed, return FALSE so that we exit the
	//  application, rather than start the application's message pump.
	return FALSE;
}

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About the Author

Daniel Lohmann
Germany Germany
Daniel Lohmann (daniel@losoft.de) is Assistant Professor at the Distributed Systems and Operating Systems department at Friedrich-Alexander-University Erlangen-Nuremberg, Germany. His main research topic is the design of a highly customizable and scalable operating system product line for deeply embedded systems using static configuration and aspect-oriented techniques. Before joining Universität Erlangen he worked as a freelance trainer and consultant for NT system programming, advanced C++ programming and OOA/OOD. He is interested in upcoming programming techniques like aspect-oriented programming, generative programming and C++ meta coding and has written some nice and handy tools for Windows NT which you can download at his web site.

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