Subj : Re: How to distinguish objects of the same type in C?
To   : netscape.public.mozilla.jseng
From : Peter Wilson
Date : Thu Aug 11 2005 09:14 am

Weiyang Zhou wrote:
> Hi,
> 
> If I use JS_initClass to define a class Foo, the contructor will allocate 
> some instance data in C for the object created. I also use JS_DefineFunction 
> to define a function called fooOp(). Assuming the C implementation of this 
> function is fooOp_native().
> 
> With the following JavaScript:
> 
> f1 = new Foo();
> f2 = new Foo();
> 
> fooOp(f1, f2);
> 
> In fooOp_native(), I will need to retrieve the instance data from each 
> object. How should I do that?
> 
> I have read jsdate.c, seems it uses OBJ_SET_SLOT/OBJ_GET_SLOT, but it is not 
> in jsapi.h. Or should I use JS_SetPrivate/JS_GetPrivate?
> 
> Thank you
> Weiyang
> 
I use JS_SetPrivate/JS_GetPrivate for a number of native classes - does
everything I need. I also hook into the destructor to make sure I release
private data when the JS equiv is garbage collected.

Pete
--
Peter Wilson. http://www.whitebeam.org, http://www.yellowhawk.co.uk

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