is.rule {rmake}

Check if the argument is a valid rule object.

Description

Function tests whether x is a valid rule object, i.e., whether it is list a list and inherits from the rmake.rule S3 class. Instances of rule represent an atomic building unit, i.e. a command that has to 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()