From: Gary Guo <gary@garyguo.net>
To: Laine Taffin Altman <alexanderaltman@me.com>
Cc: "Wedson Almeida Filho" <wedsonaf@gmail.com>,
rust-for-linux@vger.kernel.org, "Miguel Ojeda" <ojeda@kernel.org>,
"Alex Gaynor" <alex.gaynor@gmail.com>,
"Boqun Feng" <boqun.feng@gmail.com>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 7/7] rust: sync: add support for dispatching on Arc and ArcBorrow.
Date: Sat, 31 Dec 2022 19:51:54 +0000 [thread overview]
Message-ID: <20221231195154.24c07869.gary@garyguo.net> (raw)
In-Reply-To: <D0EB09C0-A9F6-4AB3-B9A2-98ACDAA25DAD@me.com>
On Tue, 27 Dec 2022 23:24:37 -0800
Laine Taffin Altman <alexanderaltman@me.com> wrote:
> > +// This is to allow `ArcBorrow<U>` to be dispatched on when `ArcBorrow<T>` can be coerced into
> > +// `ArcBorrow<U>`.
> > +impl<T: ?Sized + Unsize<U>, U: ?Sized> core::ops::DispatchFromDyn<ArcBorrow<'_, U>>
> > + for ArcBorrow<'_, T>
>
> These lifetimes need to be tied together, I think.
> `impl<'a, T: ?Sized + Unsize<U> + 'a, U: ?Sized + 'a> core::ops::DispatchFromDyn<ArcBorrow<'a, U>> for ArcBorrow<'a, T>`
I don't think this is necessary, libcore has the following code
(https://doc.rust-lang.org/stable/src/core/ops/unsize.rs.html#123):
impl<'a, T: ?Sized + Unsize<U>, U: ?Sized> core::ops::DispatchFromDyn<&'a U> for &'a T {}
which should be equivalent to Wedson's lifetime elided version.
Best,
Gary
next prev parent reply other threads:[~2022-12-31 19:52 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-28 6:03 [PATCH 1/7] rust: sync: add `Arc` for ref-counted allocations Wedson Almeida Filho
2022-12-28 6:03 ` [PATCH 2/7] rust: sync: allow type of `self` to be `Arc<T>` or variants Wedson Almeida Filho
2022-12-28 10:03 ` Alice Ryhl
2022-12-31 19:37 ` Gary Guo
2023-01-04 16:12 ` Vincenzo
2022-12-28 6:03 ` [PATCH 3/7] rust: sync: allow coercion from `Arc<T>` to `Arc<U>` Wedson Almeida Filho
2022-12-28 10:03 ` Alice Ryhl
2022-12-31 19:37 ` Gary Guo
2023-01-04 16:13 ` Vincenzo
2022-12-28 6:03 ` [PATCH 4/7] rust: sync: introduce `ArcBorrow` Wedson Almeida Filho
2022-12-28 7:15 ` Laine Taffin Altman
2022-12-28 10:03 ` Alice Ryhl
2022-12-31 19:43 ` Gary Guo
2023-01-04 15:29 ` Wedson Almeida Filho
2023-01-04 16:06 ` Emilio Cobos Álvarez
2023-01-04 17:52 ` Wedson Almeida Filho
2023-01-16 22:07 ` Gary Guo
2023-01-21 0:44 ` Boqun Feng
2023-01-16 22:42 ` Vincenzo Palazzo
2022-12-28 6:03 ` [PATCH 5/7] rust: sync: allow type of `self` to be `ArcBorrow<T>` Wedson Almeida Filho
2022-12-28 10:04 ` Alice Ryhl
2022-12-31 19:44 ` Gary Guo
2023-01-04 16:18 ` Vincenzo
2022-12-28 6:03 ` [PATCH 6/7] rust: sync: introduce `UniqueArc` Wedson Almeida Filho
2022-12-28 7:19 ` Laine Taffin Altman
2022-12-31 19:46 ` Gary Guo
2022-12-28 10:04 ` Alice Ryhl
2022-12-31 19:47 ` Gary Guo
2023-01-04 16:21 ` Vincenzo
2022-12-28 6:03 ` [PATCH 7/7] rust: sync: add support for dispatching on Arc and ArcBorrow Wedson Almeida Filho
2022-12-28 7:24 ` Laine Taffin Altman
2022-12-31 19:51 ` Gary Guo [this message]
2022-12-28 10:04 ` Alice Ryhl
2022-12-31 19:52 ` Gary Guo
2023-01-04 16:26 ` Vincenzo
2022-12-28 7:09 ` [PATCH 1/7] rust: sync: add `Arc` for ref-counted allocations Laine Taffin Altman
2022-12-28 7:27 ` Wedson Almeida Filho
2022-12-28 7:32 ` Laine Taffin Altman
2022-12-28 10:03 ` Alice Ryhl
2022-12-28 10:14 ` Wedson Almeida Filho
2022-12-28 10:38 ` Alice Ryhl
2022-12-31 19:55 ` Gary Guo
2023-01-04 16:08 ` Vincenzo
2023-01-10 20:22 ` Boqun Feng
2023-01-10 21:20 ` Peter Zijlstra
2023-01-10 21:36 ` Boqun Feng
2023-01-10 21:54 ` Peter Zijlstra
2023-01-16 21:06 ` Boqun Feng
2023-01-16 23:34 ` Miguel Ojeda
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