[Cffi-devel] What is the proper way to do GC in CFFI

[Willem Rein Oudshoorn]

Joeish W <joeish80829 at yahoo.com> writes:

> I have Lisp functions that wrap C wrappers for C++ functions that
> contain a new operator. The C wrappers have to stay the same I can't
> change those but I was advised to update my method of GC.

As already mentioned before, use the package 'trivial-garbage'.

The cl-git package that wraps the libgit2 C code might be a good
example.  

The cl-git code tries the handle automatic freeing by the garbage
collector, but also allows you to free manually.  
In addition it keeps track of dependencies, e.g. in cl-git 
a 'commit' is only valid as long as the 'repository' is open.

It is not much code and might give some inspiration.  

Disclaimer, I was quite involved in this bit of cl-git, the 
project is on github:

https://github.com/russell/cl-git


As an additional question, maybe not well suited for this list.
I see you are wrapping the OpenCV code.  There are already two 
other wrappers.  So I am curious what are the deficiencies of the 
existing wrappers that your wrapper tries to solve?

Wim Oudshoorn.