slice_utils/
index.rs

1use core::ops::{Index, IndexMut};
2
3use crate::{
4    Chain, Cycle, Interleave, Reverse, Slice, SliceBorrowed, SliceMut, SliceOf, SplitMut, Unique,
5};
6
7macro_rules! impl_index {
8    ($(
9        $typ:ident [$($lt:lifetime),* $($generics:ident),*] $(= $unique:ident)?
10    ;)*) => {$(
11        impl<
12            $($lt,)* T, S $(, $generics)*,
13        > Index<usize> for $typ<$($lt,)* S $(, $generics)*>
14        where
15            S: SliceBorrowed<Output = T>,
16            $( $generics: SliceBorrowed<Output = T>,)*
17        {
18            type Output = <Self as Slice>::Output;
19
20            fn index(&self, index: usize) -> &Self::Output {
21                self.get(index).unwrap_or_else(|| {
22                    panic!("index out of bounds: the len is {} but the index is {index}", self.len())
23                })
24            }
25        }
26
27        impl<
28            $($lt,)* T, S $(, $generics)*,
29        > IndexMut<usize> for $typ<$($lt,)* S $(, $generics)*>
30        where
31            S: SliceBorrowed<Output = T> + SliceMut $(+ $unique)?,
32            $( $generics: SliceBorrowed<Output = T> + SliceMut,)*
33        {
34            fn index_mut(&mut self, index: usize) -> &mut Self::Output {
35                let len = self.len();
36                self.get_mut(index).unwrap_or_else(|| {
37                    panic!("index out of bounds: the len is {len} but the index is {index}")
38                })
39            }
40        }
41    )*};
42}
43
44impl_index! {
45    Chain[S2];
46    Cycle[];
47    Interleave[S2];
48    Reverse[];
49    SliceOf[];
50    SplitMut['a] = Unique;
51}
slice_utils/index.rs

slice_utils/
index.rs
