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Edit section on slot access

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* doc/ref/goops.texi (Instance Slots): Remove a little verbosity.
  (Class Slots): Correct one `slot-missing' to `slot-unbound'.
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Neil Jerram 2010-10-03 23:20:17 +01:00
parent 1e32c6cd6e
commit 647db87dbc
1 changed files with 6 additions and 10 deletions
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16
doc/ref/goops.texi
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@ -636,25 +636,21 @@ Set the value of the slot named @var{slot-name} in @var{obj} to @var{value}.
Slot Access Errors, slot-missing}).
@end deffn
GOOPS stores information about slots in class metaobjects. Internally,
GOOPS stores information about slots in classes. Internally,
all of these procedures work by looking up the slot definition for the
slot named @var{slot-name} in the class metaobject for @code{(class-of
slot named @var{slot-name} in the class @code{(class-of
@var{obj})}, and then using the slot definition's ``getter'' and
``setter'' closures to get and set the slot value.
The next four procedures differ from the previous ones in that they take
the class metaobject as an explicit argument, rather than assuming
the class as an explicit argument, rather than assuming
@code{(class-of @var{obj})}. Therefore they allow you to apply the
``getter'' and ``setter'' closures of a slot definition in one class to
an instance of a different class.
[ *fixme* I have no idea why this is useful! Perhaps when a slot in
@code{(class-of @var{obj})} shadows a slot with the same name in one of
its superclasses? There should be an enlightening example here. ]
@deffn {primitive procedure} slot-exists-using-class? class obj slot-name
Return @code{#t} if the class metaobject @var{class} has a slot
definition for a slot with name @var{slot-name}, otherwise @code{#f}.
Return @code{#t} if @var{class} has a slot definition for a slot with
name @var{slot-name}, otherwise @code{#f}.
@end deffn
@deffn {primitive procedure} slot-bound-using-class? class obj slot-name
@ -708,7 +704,7 @@ If there is no such slot with @code{#:class} or @code{#:each-subclass}
allocation, @code{class-slot-ref} calls the @code{slot-missing} generic
function with arguments @var{class} and @var{slot-name}. Otherwise, if
the slot value is unbound, @code{class-slot-ref} calls the
@code{slot-missing} generic function, with the same arguments.
@code{slot-unbound} generic function, with the same arguments.
@end deffn
@deffn procedure class-slot-set! class slot-name value