Trait signature_core::lib::marker::Unpin 1.33.0[−][src]
pub auto trait Unpin { }
Expand description
Types that can be safely moved after being pinned.
Rust itself has no notion of immovable types, and considers moves (e.g.,
through assignment or mem::replace
) to always be safe.
The Pin
type is used instead to prevent moves through the type
system. Pointers P<T>
wrapped in the Pin<P<T>>
wrapper can’t be
moved out of. See the pin
module documentation for more information on
pinning.
Implementing the Unpin
trait for T
lifts the restrictions of pinning off
the type, which then allows moving T
out of Pin<P<T>>
with
functions such as mem::replace
.
Unpin
has no consequence at all for non-pinned data. In particular,
mem::replace
happily moves !Unpin
data (it works for any &mut T
, not
just when T: Unpin
). However, you cannot use mem::replace
on data
wrapped inside a Pin<P<T>>
because you cannot get the &mut T
you
need for that, and that is what makes this system work.
So this, for example, can only be done on types implementing Unpin
:
use std::mem; use std::pin::Pin; let mut string = "this".to_string(); let mut pinned_string = Pin::new(&mut string); // We need a mutable reference to call `mem::replace`. // We can obtain such a reference by (implicitly) invoking `Pin::deref_mut`, // but that is only possible because `String` implements `Unpin`. mem::replace(&mut *pinned_string, "other".to_string());
This trait is automatically implemented for almost every type.
Implementations on Foreign Types
impl Unpin for Argument
impl Unpin for FormatSpec
impl Unpin for Alignment
impl Unpin for Count
impl Unpin for Big32x40
impl Unpin for Big8x3
impl Unpin for Sign
impl<'a> Unpin for Decimal<'a>
impl<'a> Unpin for ParseResult<'a>
impl Unpin for Unpacked
impl Unpin for Decoded
impl Unpin for FullDecoded
impl Unpin for Sign
impl<'a> Unpin for Part<'a>
impl<'a> Unpin for Formatted<'a>
impl<O, V> Unpin for BitArray<O, V> where
V: BitViewSized,
O: BitOrder,
Implementors
Auto implementors
impl Unpin for HiddenMessage
impl Unpin for ProofMessage
impl Unpin for Infallible
impl Unpin for FpCategory
impl Unpin for IntErrorKind
impl Unpin for SearchStep
impl Unpin for Commitment
impl Unpin for SignatureBlinding
impl Unpin for NonZeroI16
impl Unpin for NonZeroI32
impl Unpin for NonZeroI64
impl Unpin for NonZeroI128
impl Unpin for NonZeroIsize
impl Unpin for NonZeroU16
impl Unpin for NonZeroU32
impl Unpin for NonZeroU64
impl Unpin for NonZeroU128
impl Unpin for NonZeroUsize
impl Unpin for ParseFloatError
impl Unpin for ParseIntError
impl Unpin for TryFromIntError
impl Unpin for ParseBoolError
impl<'a> Unpin for EscapeAscii<'a>
impl<'a> Unpin for Utf8LossyChunk<'a>
impl<'a> Unpin for Utf8LossyChunksIter<'a>
impl<'a> Unpin for CharSearcher<'a>
impl<'a> Unpin for CharIndices<'a>
impl<'a> Unpin for EncodeUtf16<'a>
impl<'a> Unpin for EscapeDebug<'a>
impl<'a> Unpin for EscapeDefault<'a>
impl<'a> Unpin for EscapeUnicode<'a>
impl<'a> Unpin for SplitAsciiWhitespace<'a>
impl<'a> Unpin for SplitWhitespace<'a>
impl<'a, 'b> Unpin for DebugStruct<'a, 'b> where
'b: 'a,
impl<'a, 'b> Unpin for DebugTuple<'a, 'b> where
'b: 'a,
impl<'a, 'b> Unpin for CharSliceSearcher<'a, 'b>
impl<'a, 'b> Unpin for StrSearcher<'a, 'b>
impl<'a, F> Unpin for CharPredicateSearcher<'a, F> where
F: Unpin,
impl<'a, P> Unpin for MatchIndices<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, P> Unpin for RMatchIndices<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, P> Unpin for signature_core::lib::str::RSplit<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, P> Unpin for signature_core::lib::str::RSplitN<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, P> Unpin for RSplitTerminator<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, P> Unpin for signature_core::lib::str::Split<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, P> Unpin for signature_core::lib::str::SplitInclusive<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, P> Unpin for signature_core::lib::str::SplitN<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, P> Unpin for SplitTerminator<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, T> Unpin for ChunksExact<'a, T>
impl<'a, T> Unpin for ChunksExactMut<'a, T>
impl<'a, T> Unpin for RChunksExact<'a, T>
impl<'a, T> Unpin for RChunksExactMut<'a, T>
impl<'a, T> Unpin for RChunksMut<'a, T>
impl<'a, T, P> Unpin for GroupByMut<'a, T, P> where
P: Unpin,
impl<'a, T, P> Unpin for RSplitNMut<'a, T, P> where
P: Unpin,
impl<'a, T, P> Unpin for signature_core::lib::slice::SplitInclusive<'a, T, P> where
P: Unpin,
impl<'a, T, P> Unpin for SplitInclusiveMut<'a, T, P> where
P: Unpin,
impl<'a, T, const N: usize> Unpin for ArrayChunks<'a, T, N>
impl<'a, T, const N: usize> Unpin for ArrayChunksMut<'a, T, N>
impl<'a, T, const N: usize> Unpin for ArrayWindows<'a, T, N>
impl<B, C, const P: usize, const S: usize> Unpin for ProofCommittedBuilder<B, C, P, S> where
B: Unpin,
impl<F> Unpin for RepeatWith<F> where
F: Unpin,
impl<I> Unpin for Flatten<I> where
I: Unpin,
<<I as Iterator>::Item as IntoIterator>::IntoIter: Unpin,
impl<I, U, F> Unpin for FlatMap<I, U, F> where
F: Unpin,
I: Unpin,
<U as IntoIterator>::IntoIter: Unpin,
impl<T> Unpin for Discriminant<T>
impl<T> Unpin for MaybeUninit<T> where
T: Unpin,
impl<T, F> Unpin for Successors<T, F> where
F: Unpin,
T: Unpin,
impl<T: ?Sized> Unpin for ManuallyDrop<T> where
T: Unpin,
impl<T: ?Sized> Unpin for PhantomData<T> where
T: Unpin,