checkr (version 0.5.0)

check_null: Check NULL

Description

Checks whether an object is NULL.

Usage

check_null(x, x_name = substitute(x), error = TRUE)

Arguments

x

The object to check.

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_null(1, error = FALSE)
check_null(NULL, error = FALSE)
# }