I'm not skilled enough in this area to know for sure, but my gut feeling is that there must be simpler solution.
Unfortunately I don't think so. Nobu suggested a reference counting solution, which I don't think would work, and isn't any simpler.
The implementation isn't so horrible, its mostly:
st_hash dependents
Document#register_dependent(VALUE object, callback)
{
register in hash
}
Document#unregister_dependent(VALUE object)
{
unregister in hash
}
Document#free
{
loop over dependents
}
A Ruby programmer should never have to force the GC.
Yeah, I agree.Anyway, I put in a test case for just this issue in one of the test suites (XPath I think). It should be commented out at the moment.
Charlie
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