No. First class continuations of the kind provided in scheme can be used as a means to implement generators, but downward-only continuations as currently provided in R are not sufficient for that. This version is intended only as a non-local exit mechanism.
Best, luke On Mon, 31 Mar 2008, f.jamitzky wrote: > > callcc is similar to the "yield" keyword in python and c# > it lets you define e.g. a generator of lists of numbers. > > > > > Gabor Grothendieck wrote: >> >> Would anyone like to explain if callCC in R 2.7.0 gives >> anything that on.exit does not already provide? >> >> It seems that the exit condition once defined cannot >> be added to overridden whereas with on.exit multiple >> on.exit's add additional on.exits rather than being ignored. >> >> Is this important? >> >> ______________________________________________ >> R-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel >> >> > > -- Luke Tierney Chair, Statistics and Actuarial Science Ralph E. Wareham Professor of Mathematical Sciences University of Iowa Phone: 319-335-3386 Department of Statistics and Fax: 319-335-3017 Actuarial Science 241 Schaeffer Hall email: [EMAIL PROTECTED] Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
