non_empty_slice/
cow.rs

1//! Non-empty [`Cow<'_, [T]>`](Cow).
2
3cfg_select! {
4    feature = "std" => {
5        use std::borrow::Cow;
6    }
7    feature = "alloc" => {
8        use alloc::borrow::Cow;
9    }
10    _ => {
11        compile_error!("expected either `std` or `alloc` to be enabled");
12    }
13}
14
15use crate::{boxed::NonEmptyBoxedSlice, slice::NonEmptySlice, vec::NonEmptyVec};
16
17/// Represents clone-on-write slices, [`Cow<'a, [T]>`](Cow).
18pub type CowSlice<'a, T> = Cow<'a, [T]>;
19
20/// Represents non-empty clone-on-write slices, [`Cow<'a, NonEmptySlice<T>>`](Cow).
21pub type NonEmptyCowSlice<'a, T> = Cow<'a, NonEmptySlice<T>>;
22
23impl<T: Clone> From<NonEmptyCowSlice<'_, T>> for NonEmptyVec<T> {
24    fn from(non_empty: NonEmptyCowSlice<'_, T>) -> Self {
25        non_empty.into_owned()
26    }
27}
28
29impl<T: Clone> From<NonEmptyCowSlice<'_, T>> for NonEmptyBoxedSlice<T> {
30    fn from(non_empty: NonEmptyCowSlice<'_, T>) -> Self {
31        non_empty.into_owned().into_non_empty_boxed_slice()
32    }
33}
34
35impl<'a, T: Clone> From<&'a NonEmptySlice<T>> for NonEmptyCowSlice<'a, T> {
36    fn from(non_empty: &'a NonEmptySlice<T>) -> Self {
37        Self::Borrowed(non_empty)
38    }
39}
40
41impl<T: Clone> From<NonEmptyVec<T>> for NonEmptyCowSlice<'_, T> {
42    fn from(non_empty: NonEmptyVec<T>) -> Self {
43        Self::Owned(non_empty)
44    }
45}
46
47impl<'a, T: Clone> From<&'a NonEmptyVec<T>> for NonEmptyCowSlice<'a, T> {
48    fn from(non_empty: &'a NonEmptyVec<T>) -> Self {
49        Self::Borrowed(non_empty.as_non_empty_slice())
50    }
51}
non_empty_slice/cow.rs

non_empty_slice/
cow.rs
