Check if the class of the control list is one of those that can be used by the calling function
This function can be called to check that the control list passed is
appropriate for the function to be controlled. It does so by looking up
the class of the
control argument (defaulting to the
control variable in the calling function) and checking if it
matches a list of acceptable classes (defaulting to the name of the
calling function with "control." prepended).
1 2 3 4 5 6 7
List of control function names which are acceptable.
Name of the calling function (used in the error message).
The control list. Defaults to the