[ALACPP] More C++ GC stuff

["Arlo Belshee" <arlo@xxxxxxxxx>]

As I look more closely at the implementation for the GC that I mentioned, I
wonder how much of it will remain in a final solution.

The interface is very nice; I would certainly keep that.

However, the threading model is, um, not present, and the exception handling
is "almost" correct. Um. Yeah.

Also, there are the aforementioned performance issues.

My current thinking is that this would make an excellent reference
implementation. There are a number of tricky issues that he has worked out.
Some of them are rather subtle (such as how he avoids collection of objects
during their construction). So I might use it as the basis for a real system,
or I might write my own, based on learning from it.

In any case, it would be a worthwhile project. A gc_ptr class with real
performance and correctness guarantees could be very useful. GC with nice
syntax that lets me use the stack too! Now that would be awesome.

Arlo


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