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Re: [std-proposals] Dispatching enum class

From: Gergely Nagy <gergely.nagy.alt_at_[hidden]>
Date: Fri, 1 Apr 2022 19:03:44 +0200

Well, state machines are not that uncommon. The self-mutating part is not
much weirder than the self-mutating nature of a normal class.

Besides state machines, it can be useful for VM-like things.

The point is that maintaining switch statements together with the enum is
error-prone above a level.

If "out-of-the-box" self-mutation is a problem, it can be made an opt-in
feature, like for lambdas:

enum class DispatchStuff(int Arg1, double Arg2) *mutable* : int {

Of course there are nuances, like can it be templated for the arguments,


Jason McKesson via Std-Proposals <std-proposals_at_[hidden]> ezt írta
(időpont: 2022. ápr. 1., P, 18:53):

> Is this a circumstance that comes up often enough to *require* a
> language feature like this? I mean yes, it simplifies these specific
> cases, but are these cases prevalent enough to be worthy of being
> simplified?
> I would much rather see the code spelled out, so that it is pretty
> obvious what is going on when you "call" such a value. Especially if
> it's going to be self-mutating.
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Received on 2022-04-01 17:03:58