exitCheck()
exitCheck provides a mechanism to distinguish the
exit status in on.exit expressions.
It generates a function that is used wihtin a function's
body to "flag" normal exits and in its
on.exit expression to check the exit status
of a function. Note that it will correctly detect errors
only if all normal exit are wrapped into a call to it.
# define some functionf <- function(err){ # initialise an error checker success <- exitCheck() # do something on exit that depends on the error status on.exit({ if(success()) cat("Exit with no error: do nothing\n") else cat("Exit with error: cleaning up the mess ...\n") }) # throw an error here if( err ) stop('There is an error') success(1+1) }# without errorf(FALSE)Exit with no error: do nothing[1] 2# with errortry( f(TRUE) )Exit with error: cleaning up the mess ...