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
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")
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