Warn about extraneous arguments in the ... of its caller. A utility to be used e.g., in S3 methods which need a formal ... argument but do not make any use of it. This helps catching user errors in calling the function in question (which is the caller of chkDots()).
chkDots(..., which.call = -1, allowed = character(0))| Parameter | Description |
|---|---|
... |
“the dots”, as passed from the caller. |
which.call |
passed to sys.call(). A caller may use -2 if the message should mention its caller. |
allowed |
not yet implemented: character vector of named elements in ... which are “allowed” and hence not warned about. |
# NOT RUN {
seq.default ## <- you will see ' chkDots(...) '
seq(1,5, foo = "bar") # gives warning via chkDots()
## warning with more than one ...-entry:
density.f <- function(x, ...) NextMethod("density")
x <- density(structure(rnorm(10), class="f"), bar=TRUE, baz=TRUE)
# }