checkr (version 0.5.0)

check_function: Check Function

Description

Checks if x is a function.

Usage

check_function(x, nargs = NA, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.

nargs

A count of the number of arguments or count range of the minimum and maximum number of arguments.

x_name

A string of the name of the object.

error

A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.

Value

An invisible copy of x (if it doesn't throw an error).

Examples

# NOT RUN {
check_function(character, error = FALSE)
check_function(character, nargs = 0L, error = FALSE)
# }