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From: | Michael Heerdegen |
Subject: | bug#31715: cl-incf and cl-decf error out when passed a nil-valued variable as 'offset' |
Date: | Tue, 05 Jun 2018 01:43:21 +0200 |
User-agent: | Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) |
Noam Postavsky <npostavs@gmail.com> writes: > X is an optional macro parameter, so the "optionalness" applies at > compile time. Are you sure we always treat optional macro parameters like this? > I think that would approximately double the cost of cl-incf in the > simple case [...] We could drop the optimization in case an X expression is specified, resulting in one additional `or' call: (defmacro cl-incf (place &optional x) (if (and (symbolp place) (not x)) (list 'setq place (list '1+ place)) (list 'cl-callf '+ place (or x 1)))) Would that be significantly slower than the current definition? Michael.
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