Stop with message if dot_args is a non-trivial list.

Source: R/stop_if_dot_args.R

Generate a stop with a good error message if the dots argument was a non-trivial list. Useful in writing functions that force named arguments.

stop_if_dot_args(dot_args, msg = "")

Arguments

dot_args

substitute(list(...)) from another function.
msg

character, optional message to prepend.

Value

NULL or stop()

Examples


f <- function(x, ..., inc = 1) {
   stop_if_dot_args(substitute(list(...)), "f")
   x + inc
}
f(7)

#> [1] 8
f(7, inc = 2)

#> [1] 9
tryCatch(
  f(7, 2),
  error = function(e) { print(e) }
)

#> <simpleError: f unexpected arguments: ‘2’>