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体验新版 GitCode,发现更多精彩内容 >>
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fd42918a
编写于
3月 25, 2019
作者:
C
Chris Gregory
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差异文件
Link to PhantomData in NonNull documentation
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4c27fb19
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src/libcore/ptr.rs
src/libcore/ptr.rs
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src/libcore/ptr.rs
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fd42918a
...
...
@@ -2869,10 +2869,10 @@ fn from(p: NonNull<T>) -> Self {
/// However the pointer may still dangle if it isn't dereferenced.
///
/// Unlike `*mut T`, `NonNull<T>` is covariant over `T`. If this is incorrect
/// for your use case, you should include some
PhantomData
in your type to
/// for your use case, you should include some
[`PhantomData`]
in your type to
/// provide invariance, such as `PhantomData<Cell<T>>` or `PhantomData<&'a mut T>`.
/// Usually this won't be necessary; covariance is correct for most safe abstractions,
/// such as
Box, Rc, Arc, Vec, and LinkedList
. This is the case because they
/// such as
`Box`, `Rc`, `Arc`, `Vec`, and `LinkedList`
. This is the case because they
/// provide a public API that follows the normal shared XOR mutable rules of Rust.
///
/// Notice that `NonNull<T>` has a `From` instance for `&T`. However, this does
...
...
@@ -2883,6 +2883,7 @@ fn from(p: NonNull<T>) -> Self {
/// it is your responsibility to ensure that `as_mut` is never called, and `as_ptr`
/// is never used for mutation.
///
/// [`PhantomData`]: ../marker/struct.PhantomData.html
/// [`UnsafeCell<T>`]: ../cell/struct.UnsafeCell.html
#[stable(feature
=
"nonnull"
,
since
=
"1.25.0"
)]
#[repr(transparent)]
...
...
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