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

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Message-Id: <DAOMRPB1PANF.3GPOCH6T8NF80@kernel.org>
Date: Tue, 17 Jun 2025 09:30:08 +0200
From: "Benno Lossin" <lossin@...nel.org>
To: "Alice Ryhl" <aliceryhl@...gle.com>, "Miguel Ojeda" <ojeda@...nel.org>
Cc: <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 CEST, Alice Ryhl 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>

Reviewed-by: Benno Lossin <lossin@...nel.org>

---
Cheers,
Benno

> ---
>  rust/kernel/rbtree.rs | 6 ++++++
>  1 file changed, 6 insertions(+)