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Re: Functional datatypes in Guile

From: pukkamustard
Subject: Re: Functional datatypes in Guile
Date: Tue, 07 Mar 2023 15:02:35 +0000

Linus Björnstam <> writes:

> On Sat, 4 Mar 2023, at 17:38, pukkamustard wrote:
>> Hi Dave,
>> Makes me wonder, are Andy Wingo's fash/fector purely functional? Why do
>> they need atomic boxes? Aren't they only necessary for destructive
>> updates?
> This is to make sure that transient-fectors/flashes (in-place mutation
> with some copying going on to not break the other copies of the sector
> being mutated) thread safe. They should only be mutated by the current
> thread.
> It is a nice trade off , since you get a lot less copying if you
> mutate many values in the same leaf. This is especially good when
> building a fector meaning you can fill every tail by just using
> vector-set! without copying. Let's just say that it becomes a lot
> faster:)

Thank you for explaining. That makes a lot of sense!


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