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Implement TrustedRandomAccess for slice::{Chunks, ChunksMut, Windows}

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This commit is contained in:
Sebastian Dröge 2018-01-03 00:58:56 +02:00
parent b107f720e5
commit 48f2f71185
1 changed files with 28 additions and 0 deletions
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28
src/libcore/slice/mod.rs
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@ -2117,6 +2117,14 @@ impl<'a, T> ExactSizeIterator for Windows<'a, T> {}
#[unstable(feature = "fused", issue = "35602")]
impl<'a, T> FusedIterator for Windows<'a, T> {}
#[doc(hidden)]
unsafe impl<'a, T> TrustedRandomAccess for Windows<'a, T> {
unsafe fn get_unchecked(&mut self, i: usize) -> &'a [T] {
from_raw_parts(self.v.as_ptr().offset(i as isize), self.size)
}
fn may_have_side_effect() -> bool { false }
}
/// An iterator over a slice in (non-overlapping) chunks (`chunk_size` elements at a
/// time).
///
@ -2228,6 +2236,16 @@ impl<'a, T> ExactSizeIterator for Chunks<'a, T> {}
#[unstable(feature = "fused", issue = "35602")]
impl<'a, T> FusedIterator for Chunks<'a, T> {}
#[doc(hidden)]
unsafe impl<'a, T> TrustedRandomAccess for Chunks<'a, T> {
unsafe fn get_unchecked(&mut self, i: usize) -> &'a [T] {
let start = i * self.size;
let end = cmp::min(start + self.size, self.v.len());
from_raw_parts(self.v.as_ptr().offset(start as isize), end - start)
}
fn may_have_side_effect() -> bool { false }
}
/// An iterator over a slice in (non-overlapping) mutable chunks (`chunk_size`
/// elements at a time). When the slice len is not evenly divided by the chunk
/// size, the last slice of the iteration will be the remainder.
@ -2331,6 +2349,16 @@ impl<'a, T> ExactSizeIterator for ChunksMut<'a, T> {}
#[unstable(feature = "fused", issue = "35602")]
impl<'a, T> FusedIterator for ChunksMut<'a, T> {}
#[doc(hidden)]
unsafe impl<'a, T> TrustedRandomAccess for ChunksMut<'a, T> {
unsafe fn get_unchecked(&mut self, i: usize) -> &'a mut [T] {
let start = i * self.chunk_size;
let end = cmp::min(start + self.chunk_size, self.v.len());
from_raw_parts_mut(self.v.as_mut_ptr().offset(start as isize), end - start)
}
fn may_have_side_effect() -> bool { false }
}
//
// Free functions
//