Vitaly S. wrote:
Martin Morgan <mtmor...@fhcrc.org> writes:
So, can I be sure that for such functions parent.frame(2) will always work?
What are the additional rules?
callNextMethod() will cause additional problems; the idea that you'll
grab things from somewhere other than function arguments doesn't seem
like a robust design, even if it's used in some important parts of R.
Martin
That make it difficult to handle unevaluated expressions in methods. A solution
would be to explicitly require the users to use quote() or expression(), and
then to use the "expression" in the signature. Slightly unpleasant, though.
You could use formulas for that. If you pass in
formula = ~ x + y*z
then environment(formula) will be the right evaluation environment, and
formula[[2]] will be the unevaluated x + y*z.
Duncan Murdoch
Standardised, simpler syntax like .() in ggplot and plyr, would be handy here.
Hopefully .() is not grabbed for something else in meanwhile:).
Vitaly.
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