Re: Creating environments/frames ?

[Han-Wen Nienhuys <hanwen@cs.uu.nl>]

mcmanus@IDT.NET writes:
> > I want different C++ objects (with scheme embedded) to be linked by
> > C++ pointers.  I want to access these other objects from the Scheme
> > code, and I want access to these pointers from C++.
> 
> You can do this with a  combination of smob's and primitive functions,
> though it may not be  be exactly what you wanted.   You would have one
> smob  for each class in  your application, and then  you would write a
> primitive function that would return the objects  that are linked to a
> base object.

And the smob and the C++ class are interlinked?  Like

	class Foo_class {
		Foo_smob *smob_ptr_;
	}

	struct Foo_smob {
		Foo_class *class_ptr_
	}

> > (The reason for this, is that I want to do "reverse GC": I want to
> > remove an object, and have all references to it disappear
> > automagically)
> 
> I'm not going to try to help you there; the only thought that comes to
> mind is that you should decide  whether Scheme determines the lifetime
> of an object, or  if C++ does.  There  are good strategies for dealing
> with both cases.

C++ determines life time, so what is the strategy?


-- 

Han-Wen Nienhuys, hanwen@cs.uu.nl ** GNU LilyPond - The Music Typesetter 
      http://www.cs.uu.nl/people/hanwen/lilypond/index.html