is.rule: Check if the argument is a valid rule object.

In rmake: Makefile Generator for R Analytical Projects

Check if the argument is a valid rule object.

Description

Function tests whether x is a valid rule object, i.e., whether it is a list and inherits from the rmake.rule S3 class. Instances of rule represent an atomic building unit, i.e., a command that must be executed, which optionally depends on some files or other rules – see rule() for more details.

Usage

is.rule(x)

Arguments

x	An argument to be tested

Value

TRUE if x is a valid rule object and FALSE otherwise.

Author(s)

Michal Burda

See Also

rule(), makefile(), rRule(), markdownRule(), offlineRule()

rmake documentation built on Nov. 12, 2025, 9:06 a.m.