* lisp/emacs-lisp/gv.el (gv-letplace): Fix doc typo.
(gv-define-simple-setter): Update doc of `fix-return'.
* doc/lispref/variables.texi (Adding Generalized Variables):
Update description of FIX-RETURN expansion.
* doc/misc/cl.texi (Obsolete Setf Customization):
Revert defsetf example to the more correct let rather than prog1.
+2012-11-07 Glenn Morris <rgm@gnu.org>
+
+ * variables.texi (Adding Generalized Variables):
+ Update description of FIX-RETURN expansion.
+
2012-11-06 Glenn Morris <rgm@gnu.org>
* variables.texi (Setting Generalized Variables):
@code{setcar} returns the value that it set. If your @var{setter}
function does not return @var{value}, use a non-@code{nil} value for
the @var{fix-return} argument of @code{gv-define-simple-setter}. This
-wraps the @code{setf} expansion in @code{(prog1 @var{value} @dots{})}
-so that it returns the correct result.
+expands into something equivalent to
+@example
+(let ((temp @var{value}))
+ (@var{setter} @var{args}@dots{} temp)
+ temp)
+@end example
+so ensuring that it returns the correct result.
@end defmac
+2012-11-07 Glenn Morris <rgm@gnu.org>
+
+ * cl.texi (Obsolete Setf Customization):
+ Revert defsetf example to the more correct let rather than prog1.
+
2012-11-06 Glenn Morris <rgm@gnu.org>
* cl.texi (Overview): Mention EIEIO here, as well as the appendix.
@end defmac
@defmac defsetf access-fn update-fn
-This is the simpler of two @code{defsetf} forms, and is entirely
-obsolete, being replaced by @code{gv-define-simple-setter} in Emacs
-24.3.
+This is the simpler of two @code{defsetf} forms, and is
+replaced by @code{gv-define-simple-setter} in Emacs 24.3.
@xref{Adding Generalized Variables,,,elisp,GNU Emacs Lisp Reference Manual}.
Where @var{access-fn} is the name of a function that accesses a place,
something more like
@example
-(prog1 @var{value}
- (@var{update-fn} @var{arg1} @var{arg2} @var{arg3} @var{value}))
+(let ((temp @var{value}))
+ (@var{update-fn} @var{arg1} @var{arg2} @var{arg3} temp)
+ temp)
@end example
Some examples are:
+2012-11-07 Glenn Morris <rgm@gnu.org>
+
+ * emacs-lisp/gv.el (gv-letplace): Fix doc typo.
+ (gv-define-simple-setter): Update doc of `fix-return'.
+
2012-11-07 Stefan Monnier <monnier@iro.umontreal.ca>
* emacs-lisp/gv.el (gv-define-simple-setter): Don't evaluate `val'
GETTER will be bound to a copyable expression that returns the value
of PLACE.
SETTER will be bound to a function that takes an expression V and returns
-and new expression that sets PLACE to V.
+a new expression that sets PLACE to V.
BODY should return some Elisp expression E manipulating PLACE via GETTER
and SETTER.
The returned value will then be an Elisp expression that first evaluates
This macro is an easy-to-use substitute for `gv-define-expander' that works
well for simple place forms. Assignments of VAL to (NAME ARGS...) are
turned into calls of the form (SETTER ARGS... VAL).
+
If FIX-RETURN is non-nil, then SETTER is not assumed to return VAL and
-instead the assignment is turned into (prog1 VAL (SETTER ARGS... VAL))
+instead the assignment is turned into something equivalent to
+ \(let ((temp VAL))
+ (SETTER ARGS... temp)
+ temp)
so as to preserve the semantics of `setf'."
(declare (debug (sexp (&or symbolp lambda-expr) &optional sexp)))
`(gv-define-setter ,name (val &rest args)