Luke Tierney wrote: > On Tue, 9 Dec 2008, Wacek Kusnierczyk wrote: > >> Stavros Macrakis wrote: >>> >>> R does not have continuations or call-with-current-continuation or >>> other >>> mechanisms for implementing coroutines, general iterators, and the >>> like. >>> >> >> there is callCC, for example, which however seems kind of obsolete. > > There is nothing obsolete about it. It supports only downward or > dynamic extent continuations and so is not useful (nor intended) for > the things Stavros mentions. It is useful for escaping from deeply > nested function calls, for example recursive examination of tree > structures -- that is why it exists. At some point upward (at least > one-shot) contitnuations may be added as well, but probably not soon. > > luke
ok, thanks for the explanation. vQ ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
