assert_integer_scalar: Is an Argument an Integer Scalar?

In admiraldev: Utility Functions and Development Tools for the Admiral Package Family

Is an Argument an Integer Scalar?

Description

Checks if an argument is an integer scalar

Usage

assert_integer_scalar(
  arg,
  subset = "none",
  optional = FALSE,
  arg_name = rlang::caller_arg(arg),
  message = NULL,
  class = "assert_integer_scalar",
  call = parent.frame()
)

Arguments

arg	A function argument to be checked Default value none
subset	A subset of integers that arg should be part of. Permitted values "none", "positive", "non-negative", or "negative" Default value "none"
optional	Is the checked argument optional? If set to FALSE and arg is NULL then an error is thrown Default value FALSE
arg_name	string indicating the label/symbol of the object being checked. Default value rlang::caller_arg(arg)
message	string passed to cli::cli_abort(message). When NULL, default messaging is used (see examples for default messages). "{arg_name}" can be used in messaging. Default value NULL
class	Subclass of the condition.
call	The execution environment of a currently running function, e.g. call = caller_env(). The corresponding function call is retrieved and mentioned in error messages as the source of the error. You only need to supply call when throwing a condition from a helper function which wouldn't be relevant to mention in the message. Can also be NULL or a defused function call to respectively not display any call or hard-code a code to display. For more information about error calls, see Including function calls in error messages.

Value

The function throws an error if arg is not an integer belonging to the specified subset. Otherwise, the input is returned invisibly.

See Also

Checks for valid input and returns warning or errors messages: assert_atomic_vector(), assert_character_scalar(), assert_character_vector(), assert_data_frame(), assert_date_vector(), assert_expr(), assert_expr_list(), assert_filter_cond(), assert_function(), assert_list_element(), assert_list_of(), assert_logical_scalar(), assert_named(), assert_numeric_vector(), assert_one_to_one(), assert_param_does_not_exist(), assert_s3_class(), assert_same_type(), assert_symbol(), assert_unit(), assert_vars(), assert_varval_list()

Examples

example_fun <- function(num1, num2) {
  assert_integer_scalar(num1, subset = "positive")
  assert_integer_scalar(num2, subset = "negative")
}

example_fun(1, -9)

try(example_fun(1.5, -9))

try(example_fun(2, 0))

try(example_fun("2", 0))

admiraldev documentation built on June 26, 2025, 1:09 a.m.