Back to General and Gameplay Programming

Singleton vs Global

clabinsky · 2001-12-29T17:09:17

Ok, so I have not used a Singleton yet and have thought, dreamed and hallucinated about the best of use for a Singleton class in my system. I have searched google, searched GD net, looked in Thinking C++ and Programming Gems and I do understand the theory but I am not sure about the implementation. Please give me your thoughts on each idea and if I am totally wrong in my reasoning. Instead of extern declarations of a global I can do as below. I a going to implement two Singletons for now. One is class that enumerates the card and sets the display. The other is a class with Primary surface and backbuffers. The Singletons are: CSingeltonDevice (CSingDevice.h) and CSingletonScreen (CSingScreen.h) In all subclasses that needs to reference the Singletons I need to: a) #include "CSingScreen.h" or/and #include "CSingDevice.h" //Declare the object as a member object such as: CSingletonDevice *CDevice; and/or CSingletonScreen *CScreen; //Even if the each Singleton is initiated in global scope //each class that calls them gets one and only one instance //of the object. This instance is unique in the system(?). //To use the Singleton I just: CScreen.GetPrimary(); //returns pointer to surface OR b) In the Singleton class I declare friend classes that can access the object and do not declare an object within the class - instead call to get the object when necessary. The reason that I am kind of not sure about this is that the encapsulation still suffers in the examples above. Each class that uses the Singletons is dependent on the Singleton itself but I guess this isn´t possible to avoid unless using templates where a subclass could be initiated with an arbitrary Singleton, ah well I don´t know. Your comments are highly appreciated since I am coding right now. //EDIT: I spell like a Swede 2EDIT: still unclear, hmm I am actually a Swede, living in paradise. Edited by - clabinsky on December 29, 2001 2:46:03 AM Edited by - clabinsky on December 29, 2001 2:50:39 AM

General and Gameplay Programming Programming

Started by clabinsky December 29, 2001 01:43 AM

9 comments, last by clabinsky 22 years, 3 months ago

clabinsky

122

Author

December 29, 2001 05:09 PM

Voila! How can I be so stupid. I knew that a static keeps its value even if local to a function though I did oversee that in this case, you are right!

So the static CScreen m_cScreen is not needed at all then.

Thanks a whole lot for waking me up!

Why make it simple when you can make it sooo nice and complicated?

Singleton vs Global

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

Singleton vs Global

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

Reticulating splines