user0/rust
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Add array window fn

Browse source 
Updated issue to #75027

Update to rm oob access

And hopefully fix docs as well

Fixed naming conflict in test

Fix test which used 1-indexing

Nth starts from 0, woops

Fix a bunch of off by 1 errors

See https://play.rust-lang.org/?version=nightly&mode=debug&edition=2018&gist=757b311987e3fae1ca47122969acda5a

Add even more off by 1 errors

And also write `next` and `next_back` in terms of `nth` and `nth_back`.

Run fmt

Fix forgetting to change fn name in test

add nth_back test & document unsafe

Remove as_ref().unwrap()
Documented occurrences of unsafe, noting what invariants are maintained
This commit is contained in:
kadmin 2020-08-13 19:09:14 +00:00
parent f4e4485a05
commit f240abc1dc
7 changed files with 196 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

12
src/test/ui/const-generics/type-dependent/issue-61936.rs
View file

@ -5,21 +5,21 @@
#![cfg_attr(min, feature(min_const_generics))]
trait SliceExt<T: Clone> {
fn array_windows<'a, const N: usize>(&'a self) -> ArrayWindows<'a, T, N>;
fn array_windows_example<'a, const N: usize>(&'a self) -> ArrayWindowsExample<'a, T, N>;
}
impl <T: Clone> SliceExt<T> for [T] {
fn array_windows<'a, const N: usize>(&'a self) -> ArrayWindows<'a, T, N> {
ArrayWindows{ idx: 0, slice: &self }
fn array_windows_example<'a, const N: usize>(&'a self) -> ArrayWindowsExample<'a, T, N> {
ArrayWindowsExample{ idx: 0, slice: &self }
}
}
struct ArrayWindows<'a, T, const N: usize> {
struct ArrayWindowsExample<'a, T, const N: usize> {
slice: &'a [T],
idx: usize,
}
impl <'a, T: Clone, const N: usize> Iterator for ArrayWindows<'a, T, N> {
impl <'a, T: Clone, const N: usize> Iterator for ArrayWindowsExample<'a, T, N> {
type Item = [T; N];
fn next(&mut self) -> Option<Self::Item> {
// Note: this is unsound for some `T` and not meant as an example
@ -45,7 +45,7 @@ const FOUR: usize = 4;
fn main() {
let v: Vec<usize> = vec![0; 100];
for array in v.as_slice().array_windows::<FOUR>() {
for array in v.as_slice().array_windows_example::<FOUR>() {
assert_eq!(array, [0, 0, 0, 0])
}
}