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Document unsafety in core::option

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This commit is contained in:
LeSeulArtichaut 2020-04-11 20:11:59 +02:00
parent 76882666eb
commit 37514dedab
1 changed files with 6 additions and 2 deletions
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8
src/libcore/option.rs
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@ -133,8 +133,6 @@
//! [`Box<T>`]: ../../std/boxed/struct.Box.html
//! [`i32`]: ../../std/primitive.i32.html
// ignore-tidy-undocumented-unsafe
#![stable(feature = "rust1", since = "1.0.0")]
use crate::iter::{FromIterator, FusedIterator, TrustedLen};
@ -301,6 +299,8 @@ impl<T> Option<T> {
#[inline]
#[stable(feature = "pin", since = "1.33.0")]
pub fn as_pin_ref(self: Pin<&Self>) -> Option<Pin<&T>> {
// SAFETY: `x` is guaranteed to be pinned because it comes from `self`
// which is pinned.
unsafe { Pin::get_ref(self).as_ref().map(|x| Pin::new_unchecked(x)) }
}
@ -310,6 +310,8 @@ impl<T> Option<T> {
#[inline]
#[stable(feature = "pin", since = "1.33.0")]
pub fn as_pin_mut(self: Pin<&mut Self>) -> Option<Pin<&mut T>> {
// SAFETY: `get_unchecked_mut` is never used to move the `Option` inside `self`.
// `x` is guaranteed to be pinned because it comes from `self` which is pinned.
unsafe { Pin::get_unchecked_mut(self).as_mut().map(|x| Pin::new_unchecked(x)) }
}
@ -858,6 +860,8 @@ impl<T> Option<T> {
match *self {
Some(ref mut v) => v,
// SAFETY: a `None` variant for `self` would have been replaced by a `Some`
// variant in the code above.
None => unsafe { hint::unreachable_unchecked() },
}
}