R devel - Jun 2019 - Could generic functions check different S3 methods for an object when one of them produces an error?

Dear Iago,

The R S3 object system works as expected here, using the first available method
processing the class vector from left to right. The problem is that the broom
package doesn't export the confint.geeglm() method but rather reserves it
for internal use. I can't think why the package authors chose to do that but
you could ask them. The following therefore works (following on with your
example):
> confint.geeglm <- broom:::confint.geeglm
> confint(geefit)
                    lwr         upr
(Intercept) 3607.595981 5204.790222
Frost         -2.723317    6.097207
Murder       -84.166856   38.838155

I hope this helps,
 John

  -------------------------------------------------
  John Fox, Professor Emeritus
  McMaster University
  Hamilton, Ontario, Canada
  Web: http::/socserv.mcmaster.ca/jfox
> On Jun 17, 2019, at 3:56 AM, IAGO GIN? V?ZQUEZ <i.gine at pssjd.org>
wrote:
> 
> Hi,
> 
> 
> Let's say one has an object with multiple classes, and a generic
function to apply to it has associated S3 methods for more than one of those
classes. Further, the method it chooses (I do not know how; some order in the
class vector?) is not the suitable one and it produces an error. Would there be
some way to make the generic function to choice the correct method, or in case
that for any method taken it produces an error, to try another one.
> 
> 
> For example (commented in detail
here<https://github.com/tidymodels/broom/issues/714>):
> 
> 
> # object with multiple classes: the output of function `geepack::geeglm`.
The output of `class(object)`:
> 
> ```
> 
> [1] "geeglm" "gee" "glm" "lm"
> 
> ```
> 
> The generic function: `stats::confint`.
> 
> The S3 method chosen: `confint.glm`. It produces an error. The correct
method in this case would be `broom:::confint.geeglm`.
> 
> 
> Thank you!
> 
> Iago
> 
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