Creation of an Instance
make-instance-expr uses make-atom to make a new symbol and
puts in a pointer to the class.
Next, it is necessary to fill in slots and their values. There are some
complications here:
- An instance can inherit slots not only from its direct superclass, but
from higher superclasses as well.
- Initialization of the slot may be specified in the call to
make-instance using the :initarg names defined
for each slot (rather than the name of the slot). If an :initarg
value is specified, it is evaluated.
- If no :initarg is specified, there may be an :initform
given in the slot specification. The :initform must be evaluated,
e.g.:
(creation-time
:initform (get-universal-time))
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