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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/cow.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 '')
-rw-r--r-- | library/alloc/src/vec/cow.rs | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/library/alloc/src/vec/cow.rs b/library/alloc/src/vec/cow.rs new file mode 100644 index 000000000..64943a273 --- /dev/null +++ b/library/alloc/src/vec/cow.rs @@ -0,0 +1,53 @@ +use crate::borrow::Cow; +use core::iter::FromIterator; + +use super::Vec; + +#[stable(feature = "cow_from_vec", since = "1.8.0")] +impl<'a, T: Clone> From<&'a [T]> for Cow<'a, [T]> { + /// Creates a [`Borrowed`] variant of [`Cow`] + /// from a slice. + /// + /// This conversion does not allocate or clone the data. + /// + /// [`Borrowed`]: crate::borrow::Cow::Borrowed + fn from(s: &'a [T]) -> Cow<'a, [T]> { + Cow::Borrowed(s) + } +} + +#[stable(feature = "cow_from_vec", since = "1.8.0")] +impl<'a, T: Clone> From<Vec<T>> for Cow<'a, [T]> { + /// Creates an [`Owned`] variant of [`Cow`] + /// from an owned instance of [`Vec`]. + /// + /// This conversion does not allocate or clone the data. + /// + /// [`Owned`]: crate::borrow::Cow::Owned + fn from(v: Vec<T>) -> Cow<'a, [T]> { + Cow::Owned(v) + } +} + +#[stable(feature = "cow_from_vec_ref", since = "1.28.0")] +impl<'a, T: Clone> From<&'a Vec<T>> for Cow<'a, [T]> { + /// Creates a [`Borrowed`] variant of [`Cow`] + /// from a reference to [`Vec`]. + /// + /// This conversion does not allocate or clone the data. + /// + /// [`Borrowed`]: crate::borrow::Cow::Borrowed + fn from(v: &'a Vec<T>) -> Cow<'a, [T]> { + Cow::Borrowed(v.as_slice()) + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl<'a, T> FromIterator<T> for Cow<'a, [T]> +where + T: Clone, +{ + fn from_iter<I: IntoIterator<Item = T>>(it: I) -> Cow<'a, [T]> { + Cow::Owned(FromIterator::from_iter(it)) + } +} |