zl:1 - FTP

deff 134
See the section "Special Forms for Defming Special Variables" in Symbolics
Common Lisp: Language Concepts.
deff function definition Special Form
deff is a simplified version of def. It evaluates the form definition-creator,
which should produce a function, and makes that function the defmition of
function-spec, which is not evaluated. deff is used for giving a function
spec a definition that is not obtainable with the specific defining forms
such as defun and macro. For example:
(deff faa 'bar)
makes foo equivalent to bar, with an indirection so that if bar changes,
foo likewise changes;
(deff faa (function bar»
copies the definition of bar into foo with no indirection, so that further
changes to bar have no effect on foo.
I
defflavor name instance-variables component-flavors &rest options Special Form
name is a symbol that is the name of this flavor. defflavor defines the
name of the flavor as a type name in both the Common Lisp and Zetalisp
type systems: See the section "Flavor Instances and Types" in Symbolics
Common Lisp: Language Concepts.
instance-variables is a list of the names of the instance variables containing
the local state of this flavor. Each element of this list can be written in
two ways: either the name of the instance variable by itself, or a list containing
the name of the instance variable and a default initial value for it.
Any default initial values given here are forms that are evaluated by
make-instance if they are not overridden by explicit arguments to
make-instance.
If you do not supply an initial value for an instance variable as an argument
to make-instance, and there is no default initial value provided in
the defflavor form, the value of an instance variable remains unbound.
(Another way to provide a default is by using the :default-init-plist option
to defflavor.)
component-flavors is a list of names of the component flavors from which
this flavor is built.
Each option can be either a keyword symbol or a list of a keyword symbol
and its arguments. The options to defflavor are described elsewhere:
See the section "Summary of defflavor Options" in Symbolics
Common Lisp: Language Concepts.
See the section "Complete Options for defflavor" in
Symbolics Common Lisp: Language Concepts.
Several of these options affect instance variables. These options can be given in
two ways: