R help - Feb 2005 - return from nested function?

Is is possible from within a function to cause its caller to return()?

I have a function that lets user make edits to certain objects, and then
checks that the edited objects still make sense.  If they don't, the
function
puts up a notifier that the edits are being discarded and then returns,
something like:

   if(badEdits){
       notifyDialog("bad edits will be ignored")
       return()
   }
   else {
	  ## some stuff that assigns the edited objects in the calling frame
      return()
   }

This works, but I'd really like to put the return() in the notifyDialog()
function.  Is there an easy way to do this?

Jeff

On Fri, 25 Feb 2005 jhallman at frb.gov wrote:
> Is is possible from within a function to cause its caller to return()?
Not as such. You probably want to signal and catch a condition.  Look at 
?tryCatch.

 	-thomas

> I have a function that lets user make edits to certain objects, and then
> checks that the edited objects still make sense.  If they don't, the
function
> puts up a notifier that the edits are being discarded and then returns,
> something like:
>
>   if(badEdits){
>       notifyDialog("bad edits will be ignored")
>       return()
>   }
>   else {
> 	  ## some stuff that assigns the edited objects in the calling frame
>      return()
>   }
>
> This works, but I'd really like to put the return() in the
notifyDialog()
> function.  Is there an easy way to do this?
>
> Jeff
>
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>
Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle

On Feb 25, 2005, at 12:34 PM, jhallman at frb.gov wrote:
> Is is possible from within a function to cause its caller to return()?
This snippet may be of interest:


 > f = function(x) {
+ print("f")
+ g(return())
+ print("end of f")
+ }

 > g=function(x) {print("g")
+ x
+ print("end of g")
+ }

 > f(1)
[1] "f"
[1] "g"
NULL