linux-kernel - Re: [PATCH] rbtree: rust: add RBTree::is

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Message-ID: <CANiq72mHAJvjKkJmOu3EPi7Xy7NiHFPawz32-yxWHKGeaFtjHg@mail.gmail.com>
Date: Sun, 29 Jun 2025 21:31:25 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rbtree: rust: add RBTree::is_empty

On Mon, Jun 16, 2025 at 12:36 PM Alice Ryhl <aliceryhl@...gle.com> wrote:
>
> In Rust Binder I need to be able to determine whether a red/black tree
> is empty. Thus, add a method for that operation to replace
>
>         rbtree.iter().next().is_none()
>
> This is terrible, so add a method for this purpose. We do not add a
> RBTree::len method because computing the number of elements requires
> iterating the entire tree, but checking whether it is empty can be done
> cheaply.
>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>

Applied to `rust-next` -- thanks everyone!

    [ Adjusted title. - Miguel ]

Cheers,
Miguel