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impl TrustedRandomAccess for vec::IntoIter

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This commit is contained in:
The8472 2019-11-29 01:11:14 +01:00
parent e1151844fa
commit e85cfa4f22
3 changed files with 28 additions and 3 deletions
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23
library/alloc/src/vec.rs
View File

@ -58,7 +58,9 @@ use core::cmp::{self, Ordering};
use core::fmt;
use core::hash::{Hash, Hasher};
use core::intrinsics::{arith_offset, assume};
use core::iter::{FromIterator, FusedIterator, InPlaceIterable, SourceIter, TrustedLen};
use core::iter::{
FromIterator, FusedIterator, InPlaceIterable, SourceIter, TrustedLen, TrustedRandomAccess,
};
use core::marker::PhantomData;
use core::mem::{self, ManuallyDrop, MaybeUninit};
use core::ops::Bound::{Excluded, Included, Unbounded};
@ -2936,6 +2938,25 @@ impl<T> FusedIterator for IntoIter<T> {}
#[unstable(feature = "trusted_len", issue = "37572")]
unsafe impl<T> TrustedLen for IntoIter<T> {}
#[doc(hidden)]
#[unstable(issue = "0", feature = "std_internals")]
// T: Copy as approximation for !Drop since get_unchecked does not advance self.ptr
// and thus we can't implement drop-handling
unsafe impl<T> TrustedRandomAccess for IntoIter<T>
where
T: Copy,
{
unsafe fn get_unchecked(&mut self, i: usize) -> Self::Item {
unsafe {
if mem::size_of::<T>() == 0 { mem::zeroed() } else { ptr::read(self.ptr.add(i)) }
}
}
fn may_have_side_effect() -> bool {
false
}
}
#[stable(feature = "vec_into_iter_clone", since = "1.8.0")]
impl<T: Clone> Clone for IntoIter<T> {
fn clone(&self) -> IntoIter<T> {

4
library/core/src/iter/adapters/mod.rs
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@ -18,7 +18,8 @@ pub use self::chain::Chain;
pub use self::flatten::{FlatMap, Flatten};
pub use self::fuse::Fuse;
use self::zip::try_get_unchecked;
pub(crate) use self::zip::TrustedRandomAccess;
#[unstable(feature = "trusted_random_access", issue = "none")]
pub use self::zip::TrustedRandomAccess;
pub use self::zip::Zip;
/// This trait provides transitive access to source-stages in an interator-adapter pipeline
@ -480,6 +481,7 @@ where
unsafe impl<I> TrustedRandomAccess for Cloned<I>
where
I: TrustedRandomAccess,
{
#[inline]
fn may_have_side_effect() -> bool {

4
library/core/src/iter/mod.rs
View File

@ -357,6 +357,8 @@ pub use self::adapters::MapWhile;
pub use self::adapters::SourceIter;
#[stable(feature = "iterator_step_by", since = "1.28.0")]
pub use self::adapters::StepBy;
#[unstable(feature = "trusted_random_access", issue = "none")]
pub use self::adapters::TrustedRandomAccess;
#[stable(feature = "rust1", since = "1.0.0")]
pub use self::adapters::{Chain, Cycle, Enumerate, Filter, FilterMap, Map, Rev, Zip};
#[stable(feature = "rust1", since = "1.0.0")]
@ -364,7 +366,7 @@ pub use self::adapters::{FlatMap, Peekable, Scan, Skip, SkipWhile, Take, TakeWhi
#[stable(feature = "rust1", since = "1.0.0")]
pub use self::adapters::{Fuse, Inspect};
pub(crate) use self::adapters::{process_results, TrustedRandomAccess};
pub(crate) use self::adapters::process_results;
mod adapters;
mod range;