assert_has_slot

Does the S4 input have a slot?

Checks to see if the object is an S4 object with a particular slot.

Usage
assert_has_slot(x, severity = getOption("assertive.severity", "stop"))
has_slot(x, slotname, .xname = get_name_in_parent(x))
Arguments
x
Input to check. Intended to be an S4 object.
severity
How severe should the consequences of the assertion be? Either "stop", "warning", "message", or "none".
slotname
A string naming a slot to check for.
.xname
Not intended to be used directly.
Value

has_names returns TRUE if names is non-null.

See Also

slot

Aliases
  • assert_has_slot
  • has_slot
Examples
library(assertive.properties) setClass("numbers", representation(foo = "numeric")) x <- new("numbers", foo = 1:10) has_slot(x, "foo") has_slot(x, "bar") has_slot(1:10, "foo")
Documentation reproduced from package assertive.properties, version 0.0-4, License: GPL (>= 3)

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