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[Emacs-diffs] Changes to emacs/lispref/variables.texi
From: |
Kim F. Storm |
Subject: |
[Emacs-diffs] Changes to emacs/lispref/variables.texi |
Date: |
Mon, 13 May 2002 15:04:52 -0400 |
Index: emacs/lispref/variables.texi
diff -c emacs/lispref/variables.texi:1.30 emacs/lispref/variables.texi:1.31
*** emacs/lispref/variables.texi:1.30 Tue Feb 12 14:33:46 2002
--- emacs/lispref/variables.texi Mon May 13 15:04:27 2002
***************
*** 1185,1194 ****
with @code{setq-default}.
@strong{Warning:} When a variable has buffer-local values in one or
! more buffers, you can get Emacs very confused by binding the variable
! with @code{let}, changing to a different current buffer in which a
! different binding is in effect, and then exiting the @code{let}. This
! can scramble the values of the buffer-local and default bindings.
To preserve your sanity, avoid using a variable in that way. If you
use @code{save-excursion} around each piece of code that changes to a
--- 1185,1194 ----
with @code{setq-default}.
@strong{Warning:} When a variable has buffer-local values in one or
! more buffers, binding the variable with @code{let} and changing to a
! different current buffer in which a different binding is in
! effect, and then exiting the @code{let}, the variable may not be
! restored to the value it had before the @code{let}.
To preserve your sanity, avoid using a variable in that way. If you
use @code{save-excursion} around each piece of code that changes to a
***************
*** 1197,1218 ****
@example
@group
! (setq foo 'b)
(set-buffer "a")
(make-local-variable 'foo)
@end group
(setq foo 'a)
(let ((foo 'temp))
(set-buffer "b")
@address@hidden)
@group
! foo @result{} 'a ; @r{The old buffer-local value from buffer @samp{a}}
! ; @r{is now the default value.}
@end group
@group
! (set-buffer "a")
! foo @result{} 'temp ; @r{The local @code{let} value that should be gone}
! ; @r{is now the buffer-local value in buffer @samp{a}.}
@end group
@end example
--- 1197,1219 ----
@example
@group
! (setq foo 'g)
(set-buffer "a")
(make-local-variable 'foo)
@end group
(setq foo 'a)
(let ((foo 'temp))
+ ;; foo @result{} 'temp ; @r{let binding in buffer @samp{a}}
(set-buffer "b")
+ ;; foo @result{} 'g ; @r{the global value since foo is not local in
@samp{b}}
@address@hidden)
@group
! foo @result{} 'a ; @r{we are still in buffer @samp{b}, but exiting the
let}
! ; @r{restored the local value in buffer @samp{a}}
@end group
@group
! (set-buffer "a") ; @r{This can be seen here:}
! foo @result{} 'a ; @r{we are back to the local value in buffer
@samp{a}}
@end group
@end example
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Kim F. Storm <=