checkClass: Check the class membership of an argument

Description Usage Arguments Value See Also Examples

Description

Check the class membership of an argument

Usage

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checkClass(x, classes, ordered = FALSE, null.ok = FALSE)

check_class(x, classes, ordered = FALSE, null.ok = FALSE)

assertClass(x, classes, ordered = FALSE, null.ok = FALSE,
  .var.name = vname(x), add = NULL)

assert_class(x, classes, ordered = FALSE, null.ok = FALSE,
  .var.name = vname(x), add = NULL)

testClass(x, classes, ordered = FALSE, null.ok = FALSE)

test_class(x, classes, ordered = FALSE, null.ok = FALSE)

expect_class(x, classes, ordered = FALSE, null.ok = FALSE,
  info = NULL, label = vname(x))

Arguments

x

[any]
Object to check.

classes

[character]
Class names to check for inheritance with inherits. x must inherit from all specified classes.

ordered

[logical(1)]
Expect x to be specialized in provided order. Default is FALSE.

null.ok

[logical(1)]
If set to TRUE, x may also be NULL. In this case only a type check of x is performed, all additional checks are disabled.

.var.name

[character(1)]
Name of the checked object to print in assertions. Defaults to the heuristic implemented in vname.

add

[AssertCollection]
Collection to store assertion messages. See AssertCollection.

info

[character(1)]
Extra information to be included in the message for the testthat reporter. See expect_that.

label

[character(1)]
Name of the checked object to print in messages. Defaults to the heuristic implemented in vname.

Value

Depending on the function prefix: If the check is successful, the functions assertClass/assert_class return x invisibly, whereas checkClass/check_class and testClass/test_class return TRUE. If the check is not successful, assertClass/assert_class throws an error message, testClass/test_class returns FALSE, and checkClass returns a string with the error message. The function expect_class always returns an expectation.

See Also

Other attributes: checkMultiClass, checkNamed, checkNames

Other classes: checkMultiClass, checkR6

Examples

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# Create an object with classes "foo" and "bar"
x = 1
class(x) = c("foo", "bar")

# is x of class "foo"?
testClass(x, "foo")

# is x of class "foo" and "bar"?
testClass(x, c("foo", "bar"))

# is x of class "foo" or "bar"?
## Not run: 
assert(
  checkClass(x, "foo"),
  checkClass(x, "bar")
)

## End(Not run)
# is x most specialized as "bar"?
testClass(x, "bar", ordered = TRUE)

checkmate documentation built on July 4, 2019, 5:12 p.m.