Assert that all values belong to a set — assert_values_in

Checks that every value in x appears in allowed_values. Missing values cause the check to fail unless NA is itself one of the allowed_values.

Usage

assert_values_in_set(
  x,
  allowed_values,
  null_ok = FALSE,
  arg = rlang::caller_arg(x),
  call = rlang::caller_env()
)

x: Object to check.
allowed_values: Vector of permitted values.
null_ok: Single logical. If TRUE, a NULL value passes the check without error. Use this for optional arguments that default to NULL. Defaults to FALSE, so NULL is rejected unless you opt in.
arg: Name used to refer to x in error messages. Defaults to the name of the expression passed as x.
call: Environment used as the error's call context. Defaults to the calling function, so errors point at the user's code.

The input x, invisibly.

assert_values_in_set(c("a", "b"), allowed_values = c("a", "b", "c"))