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nobus
2009 Apr 23
1
reference counting problem in .Primitive's?
I think the following rather wierd expressions show a problem in how
some of the .Primitive functions evaluate their arguments. I haven't
yet thought of a way that a nonabusive user might run into this problem.
In each case the first argument, x, is modified in the course of
evaluating the second argument and then modified x gets used
as the first argument:
> x<-as.integer(1:5); y <- x + { x[3]<-33L ; 1L } ; y
[1] 2 3 34 5 6
> x<-2^(0:4) ; y <...