[Rd] Using IDs to suppress specific messages and warnings
murdoch.duncan at gmail.com
Thu Sep 10 15:18:49 CEST 2015
On 10/09/2015 9:03 AM, Richard Cotton wrote:
> Thanks Luke,
> On 10 September 2015 at 14:47, <luke-tierney at uiowa.edu> wrote:
>> Conditions have classes and the condition system is designed around
>> the idea that classes would be used for this sort of thing. That is
>> already how tryCatch and withCallingHandlers discriminate the
>> conditions to handle.
> That makes sense. Though with my sqrt example, it's just a plain
> simpleWarning, which doesn't give you the opportunity to do special
> tryCatch(sqrt(-1), warning = function(w) class(w))
> ##  "simpleWarning" "warning" "condition"
>> Designing and implementing a condition class hierarchy to support this
>> is indeed the hard/tedious part.
> There are precedents from other languages that could be used as a
> template. For example, .NET and Java both have very well defined
> exception hierarchies that could serve as a starting point.
> Who is the best person to ask/cajole to start getting this implemented?
I think that if you put together a proposal that looks easy to implement
and maintain, and volunteered (or recruited volunteers) to do most of
the work, then it would get done. I don't think either of the posted
hierarchies would be acceptable, though, because they'd require anyone
who was writing new code to learn them.
Currently if I want to put in a warning, it's easy: I just call
warning(). If you make it take an extra 5 seconds to add something that
makes the warning more useful, I'd do it. If it takes 10 minutes of
reading through voluminous documentation, I wouldn't.
More information about the R-devel