Assert that an object has a certain class.
Usage
assertClass(
  x,
  class,
  length = NULL,
  null = FALSE,
  all = FALSE,
  extra = TRUE,
  call = parent.frame(),
  msg = NULL
)Arguments
- x
 To check.
- class
 Expected class or classes.
- length
 Required length. If
NULLlength is not checked.- null
 Whether it can be NULL.
- all
 Whether it should have all the classes or only at least one of them.
- extra
 Whether the object can have extra classes.
- call
 Call argument that will be passed to
cli.- msg
 Custom error message.