is_class_member
is_class_member — checks if an instance or class is a member of a class.
Syntax
is_class_member (instance|class, class)
Arguments
- instance|class
An instance of a class; or a class.
- class
Returns
t if the
instance or class is a
member of the class, else
nil.
Description
This function checks if a given instance or class is a
member (an instance or derived class) of another class.
Example
![[Note]](images/note.gif) | This example is based on the classes
developed in class. |
Gamma> sqB = new(Square);
{Square (length) (sides . 4)}
Gamma> is_class_member(sqB, Square);
t
Gamma> is_class_member(Square, RegPolygon);
t
Gamma> is_class_member(sqB, RegPolygon);
t
Gamma> polyF = new(RegPolygon);
{RegPolygon (length) (sides)}
Gamma> is_class_member(polyF, Square);
nil
Gamma>
