linux-kernel - Re: [PATCH v1 1/2] rust: time: Rename Delta's methods as_micros_ceil and as

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CANiq72nP+dKugMv3KXdJJsFE0oD01+zYgWbjz3e04kmhj_5MbQ@mail.gmail.com>
Date: Wed, 18 Jun 2025 11:29:26 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: FUJITA Tomonori <fujita.tomonori@...il.com>, a.hindborg@...nel.org, alex.gaynor@...il.com, 
	ojeda@...nel.org, anna-maria@...utronix.de, bjorn3_gh@...tonmail.com, 
	boqun.feng@...il.com, dakr@...nel.org, frederic@...nel.org, gary@...yguo.net, 
	jstultz@...gle.com, linux-kernel@...r.kernel.org, lossin@...nel.org, 
	lyude@...hat.com, rust-for-linux@...r.kernel.org, sboyd@...nel.org, 
	tglx@...utronix.de, tmgross@...ch.edu
Subject: Re: [PATCH v1 1/2] rust: time: Rename Delta's methods as_micros_ceil
 and as_millis

On Wed, Jun 18, 2025 at 10:05 AM Alice Ryhl <aliceryhl@...gle.com> wrote:
>
> Why are we renaming them? The stdlib always uses as_* or to_* for copy
> types. In my mind, into_* means that you want to emphasize that you are
> performing a transformation that consumes self and transfers ownership
> of some resource in the process.
>
> See the api guidelines:
> https://rust-lang.github.io/api-guidelines/naming.html#ad-hoc-conversions-follow-as_-to_-into_-conventions-c-conv

We may be going in circles here... I think the confusion is all on
what to do for "owned -> owned" `Copy` non-expensive conversions.

I think Tomo sent a patch to change the `as_` and `is_` methods to
take `&self` to be consistent with the guidelines, since they say
there is no "owned -> owned" case for `as_`. Then you mentioned that
`self` is OK and Andreas agreed, and I guess Tomo ended up with
`into_` since `to_` is only for the expensive case, even though it is
not meant for `Copy` types.

In other words, either we say in the kernel we are OK with `as_` for
"owned -> owned" too, or we take `&self`.

Did I get that right, everyone?

Thanks!

Cheers,
Miguel