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Singleton help...

Started by Remnex Oct 8, 2001 at 4:44 AM 2 replies 500+ views

Original Post

Oct 8, 2001 at 4:44 AM

I was wondering if someone could point me to a place that contains some good information about how singletons work, how to use them, advantages/disadvantes, and so on. Thanks

------------------------------ "I''m a decorated astronaut, I don''t make those kind of mistakes." "Oh now wait a minute. Look I''ll show ya. I''ll enter the same calculations using what we like to call ''The Right Way''." -Rem Zirem Software

Arild Fines

138

Arild Fines

Oct 8, 2001 at 8:08 AM

Design Patterns - Elements of Reusable Object-Oriented Software

"A society without religion is like a crazed psychopath without a loaded .45"

MonkeyChuff

Oct 8, 2001 at 8:15 AM

OK, here is an example ....

  
// SingletonTest.cpp


#include "stdafx.h"
#include "singleton.h"
#include <iostream>

void main()
{
Singleton* mySingleton1 = Singleton::Instance();
Singleton* mySingleton2 = Singleton::Instance();

mySingleton1->set_TestVal(100);

std::cout << "TestVal From Singleton 2 = " << mySingleton2->get_TestVal() << "\n";	
}

  
// Singleton.h


class Singleton
{
public:
static Singleton* Instance();
void set_TestVal(int testval);
const int get_TestVal() const;
protected:
Singleton();
private:
static Singleton* m_Instance;
int m_TestVal;
};

  
// Singleton.cpp


#include "stdafx.h"
#include "Singleton.h"

Singleton* Singleton::m_Instance = 0;

Singleton* Singleton::Instance()
{
if (m_Instance == 0)
{
	m_Instance = new(Singleton);
}

return m_Instance;
}

Singleton::Singleton(): m_TestVal(0)
{

}

void Singleton::set_TestVal(int testval)
{
m_TestVal = testval;
}

const int Singleton::get_TestVal() const
{
return m_TestVal;
}

Hope it helps.

Remnex

Author

Remnex

Oct 8, 2001 at 2:16 PM

Thanks!

------------------------------
"I''m a decorated astronaut, I don''t make those kind of mistakes."
"Oh now wait a minute. Look I''ll show ya. I''ll enter the same calculations using what we like to call ''The Right Way''."

-Rem
Zirem Software

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