Does an object inherit from a set of classes?
inherits_any() is like base::inherits() but is more explicit
about its behaviour with multiple classes. If classes contains
several elements and the object inherits from at least one of
them, inherits_any() returns TRUE.
inherits_all() tests that an object inherits from all of the
classes in the supplied order. This is usually the best way to
test for inheritance of multiple classes.
inherits_only() tests that the class vectors are identical. It
is a shortcut for identical(class(x), class).
inherits_any(x, class) inherits_all(x, class) inherits_only(x, class)
x |
An object to test for inheritance. |
class |
A character vector of classes. |
obj <- structure(list(), class = c("foo", "bar", "baz"))
# With the _any variant only one class must match:
inherits_any(obj, c("foobar", "bazbaz"))
inherits_any(obj, c("foo", "bazbaz"))
# With the _all variant all classes must match:
inherits_all(obj, c("foo", "bazbaz"))
inherits_all(obj, c("foo", "baz"))
# The order of classes must match as well:
inherits_all(obj, c("baz", "foo"))
# inherits_only() checks that the class vectors are identical:
inherits_only(obj, c("foo", "baz"))
inherits_only(obj, c("foo", "bar", "baz"))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.