this post was submitted on 13 Nov 2023
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Any way to make a variable save its old value? (alien.top)
submitted 1 year ago by field_thought_slight@alien.top to c/emacs
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I'm wondering if there's any way to make a variable automatically save its old value, so that I can, e.g., write a minor mode that will automatically restore the old values of variables when it's deactivated (without having to declare a bunch of -old-value variables).

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[–] 7890yuiop@alien.top 2 points 1 year ago

You don't have to declare a new variable each time you want to remember an old value. You could, e.g., put a custom symbol property on the variable symbol with the old value (or list of old values) you wanted to store. Or maintain a single variable mapping all your variable symbols to their old values.