checkClass: Check the class membership of an argument
In checkmate: Fast and Versatile Argument Checks

checkClass

R Documentation

Check the class membership of an argument

Description

Check the class membership of an argument

Usage

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/check_class return a string with the error message. The function expect_class always returns an expectation.

Examples

# 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 Sept. 11, 2024, 8:40 p.m.