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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 /src/test/ui/const-generics/type-dependent/issue-70507.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 'src/test/ui/const-generics/type-dependent/issue-70507.rs')
-rw-r--r-- | src/test/ui/const-generics/type-dependent/issue-70507.rs | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/test/ui/const-generics/type-dependent/issue-70507.rs b/src/test/ui/const-generics/type-dependent/issue-70507.rs new file mode 100644 index 000000000..c72d9fbec --- /dev/null +++ b/src/test/ui/const-generics/type-dependent/issue-70507.rs @@ -0,0 +1,45 @@ +// run-pass + +trait ConstChunksExactTrait<T> { + fn const_chunks_exact<const N: usize>(&self) -> ConstChunksExact<'_, T, {N}>; +} + +impl <T> ConstChunksExactTrait<T> for [T] { + fn const_chunks_exact<const N: usize>(&self) -> ConstChunksExact<'_, T, {N}> { + assert!(N != 0); + let rem = self.len() % N; + let len = self.len() - rem; + let (fst, _) = self.split_at(len); + ConstChunksExact { v: fst, } + } +} + +struct ConstChunksExact<'a, T: 'a, const N: usize> { + v: &'a [T], +} + +impl <'a, T: std::fmt::Debug, const N: usize> Iterator for ConstChunksExact<'a, T, {N}> { + type Item = &'a [T; N]; + + fn next(&mut self) -> Option<Self::Item> { + if self.v.len() < N { + None + } else { + let (fst, snd) = self.v.split_at(N); + + self.v = snd; + let ptr = fst.as_ptr() as *const _; + Some(unsafe { &*ptr}) + } + } +} + +fn main() { + let slice = &[1i32, 2, 3, 4, 5, 6, 7, 8, 9, 10]; + + let mut iter = [[1, 2, 3], [4, 5, 6], [7, 8, 9]].iter(); + + for a in slice.const_chunks_exact::<3>() { + assert_eq!(a, iter.next().unwrap()); + } +} |