[Rcpp-devel] coercion NULL to vector

Le 18/04/2018 ? 17:31, Jeff Newmiller a ?crit?:

as.numeric( NULL ) is not silent, it is very explicit.

Well, written in this way yes. But I was referring more to the content 
than to the form. If you write as.numeric(x) and at some run-time point 
x become NULL, the code won't stop with an error. It will silently 
coerce NULL to numeric(0). Analogously in what I propose, if you write 
f(vec x) and at some call x is NULL, f would continue to work as if 
called with f(numeric(0)).

Re this not being a C++ NULL, I don't object to R NULL being used that way (in fact it may be more sensible to do this than not, but it is not clear that R core thinks this way).

No sure to get your point here but never mind.

Serguei.