VC ATL, singleton or maybe not ?

singleton or maybe not ?

Author	Message
Sigurd Lersta #1 / 2	singleton or maybe not ? Hello, I'm implementing the DOM (just like MSXML) For those who know, there's a DOMImplementation interface, which can be accessed by document.documentImplementation The way I'd like to implement this DOMImplementation is on an object that is common for all documents. My program is a DLL, and I've heard that singletons don't work with DLLs, What I would like though is that there's only one DOMImplementation object for each client of the DLL. I don't know how MSXML has done it, but in all their examples, they always create a document first and access the DOMImplementation through the document, that's not really what I want, as the DOMImplementation also has a createDocument method, so it really should be the other way around. Any thoughts? thanks, -- Sigurd Lerstad
Wed, 13 Jul 2005 03:41:00 GMT

<Asim Hussnain> #2 / 2	singleton or maybe not ? COM Singletons (using declare_classfactory_singleton(x)) won't workin DLL but you can put your implementation in a class. Write your own class factory and make it to instantiate you Implementation class. Your implementation class can be a Singleton (check GoF Singleton pattern) HTH Quote: > Hello, > I'm implementing the DOM (just like MSXML) > For those who know, there's a DOMImplementation interface, which can be > accessed by document.documentImplementation > The way I'd like to implement this DOMImplementation is on an object that is > common for all documents. > My program is a DLL, and I've heard that singletons don't work with DLLs, > What I would like though is that there's only one DOMImplementation object > for each client of the DLL. > I don't know how MSXML has done it, but in all their examples, they always > create a document first and access the DOMImplementation through the > document, that's not really what I want, as the DOMImplementation also has a > createDocument method, so it really should be the other way around. > Any thoughts? > thanks, > -- > Sigurd Lerstad
Tue, 12 Jul 2005 13:08:07 GMT

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