[R] R and Scheme

Wacek Kusnierczyk Waclaw.Marcin.Kusnierczyk at idi.ntnu.no
Tue Dec 9 20:45:38 CET 2008

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.


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