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

In wrapr: Wrap R Tools for Debugging and Parametric Programming

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

Description

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.

Usage

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)
f(7, inc = 2)
tryCatch(
  f(7, 2),
  error = function(e) { print(e) }
)

wrapr documentation built on Aug. 20, 2023, 1:08 a.m.