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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /library/alloc/src/vec/in_place_drop.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'library/alloc/src/vec/in_place_drop.rs')
-rw-r--r-- | library/alloc/src/vec/in_place_drop.rs | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/library/alloc/src/vec/in_place_drop.rs b/library/alloc/src/vec/in_place_drop.rs new file mode 100644 index 000000000..1b1ef9130 --- /dev/null +++ b/library/alloc/src/vec/in_place_drop.rs @@ -0,0 +1,24 @@ +use core::ptr::{self}; +use core::slice::{self}; + +// A helper struct for in-place iteration that drops the destination slice of iteration, +// i.e. the head. The source slice (the tail) is dropped by IntoIter. +pub(super) struct InPlaceDrop<T> { + pub(super) inner: *mut T, + pub(super) dst: *mut T, +} + +impl<T> InPlaceDrop<T> { + fn len(&self) -> usize { + unsafe { self.dst.sub_ptr(self.inner) } + } +} + +impl<T> Drop for InPlaceDrop<T> { + #[inline] + fn drop(&mut self) { + unsafe { + ptr::drop_in_place(slice::from_raw_parts_mut(self.inner, self.len())); + } + } +} |