On Sep 17, 3:40 pm, Stuart Sierra <[EMAIL PROTECTED]> wrote:
> On Sep 17, 12:45 pm, Rich Hickey <[EMAIL PROTECTED]> wrote:
>
> > While it is possible to make a globally visible change to a var with
> > def, the only appropriate scenarios for doing so are to fix a bug, or
> > for scratch vars at the repl.
>
> This brings up an idea I had a while back -- what if you wanted to
> update a running system in a transaction? Say you have a bug that
> requires multiple defs to fix. You want all those defs to take effect
> at the same time. As I understand it, that's not possible with
> Clojure right now, but didn't you mention that Vars and Refs used to
> be the same thing?
>
> Of course, there might be a significant performance penalty to do a
> Ref lookup on every function call.
>
Exactly.
> This is pure speculation, not a feature that I have any need for right
> now.
>
It's an interesting idea, and something I tried, but the overhead was
too great.
Rich
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