[PATCH v5 1/7] rust: alloc: add Vec::clear

Alice Ryhl
2025-05-02T13:19:43Z

Our custom Vec type is missing the stdlib method `clear`, thus add it.
It will be used in the miscdevice sample.

Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Reviewed-by: Tamir Duberstein <tamird@gmail.com>
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
---
rust/kernel/alloc/kvec.rs | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/rust/kernel/alloc/kvec.rs b/rust/kernel/alloc/kvec.rs
index 5798e2c890a2140a12303706578ffa2a85423167..412a2fe3ce79a0681175bf358e8e0f628e77e875 100644
--- a/rust/kernel/alloc/kvec.rs
+++ b/rust/kernel/alloc/kvec.rs
@@ -413,6 +413,26 @@ pub fn into_raw_parts(self) -> (*mut T, usize, usize) {
(ptr, len, capacity)
}

+ /// Clears the vector, removing all values.
+ ///
+ /// Note that this method has no effect on the allocated capacity
+ /// of the vector.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let mut v = kernel::kvec![1, 2, 3]?;
+ ///
+ /// v.clear();
+ ///
+ /// assert!(v.is_empty());
+ /// # Ok::<(), Error>(())
+ /// ```
+ #[inline]
+ pub fn clear(&mut self) {
+ self.truncate(0);
+ }
+
/// Ensures that the capacity exceeds the length by at least `additional` elements.
///
/// # Examples

--
2.49.0.967.g6a0df3ecc3-goog