reference class internals
It's a bit of a simplification, reference classes are wrappers around environments. So if modifying a value in an environment would create a copy, then modifying the same value in a reference class will also create a copy. The situation with modifying a vector is a bit complicated as it will sometimes be modified in place and sometimes be duplicated and modified (depending on whether its NAMED attribute is 1 or 2, and exactly how you're modifying it). Hadley
On Thu, Jan 9, 2014 at 4:33 PM, Norm Matloff <matloff at cs.ucdavis.edu> wrote:
I have a question about reference classes, which someone here undoubtedly can answer immediately, saving me hours of wading through indecipherable internal code. :-) Thanks in advance. Reference class data is mutable, fine, but in what sense? Is it really physical, or is it just a view given to the programmer? If for instance I have vector as a field in a reference class, and I change one element of the vector, is it really true that the change is guaranteed to be made in-place, no copying, no memory reallocation etc? Norm
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