Trait sp_std::marker::Unpin

#[lang = "unpin"]pub auto trait Unpin { }

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<'a, T> Unpin for &'a T where
    T: 'a + ?Sized, 

impl<T> Unpin for *mut T where
    T: ?Sized, 

impl<T> Unpin for Pending<T>

impl Unpin for Waker

impl<T> Unpin for *const T where
    T: ?Sized, 

impl<T> Unpin for Ready<T>

impl<F> Unpin for PollFn<F>

impl<'a, T> Unpin for &'a mut T where
    T: 'a + ?Sized, 

impl Unpin for isize

impl<T> Unpin for [T] where
    T: Unpin, 

impl Unpin for [u8]

impl Unpin for char

impl Unpin for u128

impl Unpin for u16

impl Unpin for i128

impl Unpin for i16

impl Unpin for str

impl Unpin for f64

impl Unpin for u64

impl Unpin for u8

impl Unpin for i64

impl Unpin for i8

impl<T, const N: usize> Unpin for [T; N] where
    T: Unpin, 

impl Unpin for bool

impl Unpin for f32

impl Unpin for u32

impl Unpin for usize

impl Unpin for i32

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Implementors

impl !Unpin for PhantomPinned

impl<Dyn> Unpin for DynMetadata<Dyn> where
    Dyn: ?Sized, 

impl<T> Unpin for Rc<T> where
    T: ?Sized, 

impl<T> Unpin for Arc<T> where
    T: ?Sized, 

impl<T, A> Unpin for Box<T, A> where
    T: ?Sized,
    A: Allocator + 'static, 

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Auto implementors

impl Unpin for sp_std::cmp::Ordering

impl Unpin for Infallible

impl Unpin for sp_std::fmt::Alignment

impl Unpin for FpCategory

impl Unpin for IntErrorKind

impl Unpin for SearchStep

impl Unpin for sp_std::sync::atomic::Ordering

impl Unpin for RecvTimeoutError

impl Unpin for TryRecvError

impl Unpin for AllocError

impl Unpin for Global

impl Unpin for Layout

impl Unpin for LayoutError

impl Unpin for System

impl Unpin for TypeId

impl Unpin for BorrowError

impl Unpin for BorrowMutError

impl Unpin for Error

impl Unpin for SipHasher

impl Unpin for NonZeroI8

impl Unpin for NonZeroI16

impl Unpin for NonZeroI32

impl Unpin for NonZeroI64

impl Unpin for NonZeroI128

impl Unpin for NonZeroIsize

impl Unpin for NonZeroU8

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 RangeFull

impl Unpin for ParseBoolError

impl Unpin for Utf8Error

impl Unpin for Writer

impl Unpin for AtomicBool

impl Unpin for AtomicI8

impl Unpin for AtomicI16

impl Unpin for AtomicI32

impl Unpin for AtomicI64

impl Unpin for AtomicIsize

impl Unpin for AtomicU8

impl Unpin for AtomicU16

impl Unpin for AtomicU32

impl Unpin for AtomicU64

impl Unpin for AtomicUsize

impl Unpin for RecvError

impl Unpin for Barrier

impl Unpin for BarrierWaitResult

impl Unpin for Condvar

impl Unpin for sp_std::sync::Once

impl Unpin for OnceState

impl Unpin for WaitTimeoutResult

impl<'a> Unpin for Arguments<'a>

impl<'a> Unpin for Formatter<'a>

impl<'a> Unpin for CharSearcher<'a>

impl<'a> Unpin for Bytes<'a>

impl<'a> Unpin for CharIndices<'a>

impl<'a> Unpin for Chars<'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 Lines<'a>

impl<'a> Unpin for LinesAny<'a>

impl<'a> Unpin for SplitAsciiWhitespace<'a>

impl<'a> Unpin for SplitWhitespace<'a>

impl<'a, 'b> Unpin for DebugList<'a, 'b> where
    'b: 'a, 

impl<'a, 'b> Unpin for DebugMap<'a, 'b> where
    'b: 'a, 

impl<'a, 'b> Unpin for DebugSet<'a, 'b> where
    'b: '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, B: ?Sized> Unpin for Cow<'a, B> where
    <B as ToOwned>::Owned: Unpin, 

impl<'a, F> Unpin for CharPredicateSearcher<'a, F> where
    F: Unpin, 

impl<'a, I, A> Unpin for Splice<'a, I, A> where
    I: Unpin, 

impl<'a, K, V> Unpin for Entry<'a, K, V> where
    K: Unpin, 

impl<'a, K, V> Unpin for sp_std::collections::btree_map::Iter<'a, K, V>

impl<'a, K, V> Unpin for sp_std::collections::btree_map::IterMut<'a, K, V>

impl<'a, K, V> Unpin for Keys<'a, K, V>

impl<'a, K, V> Unpin for OccupiedEntry<'a, K, V>

impl<'a, K, V> Unpin for OccupiedError<'a, K, V> where
    V: Unpin, 

impl<'a, K, V> Unpin for sp_std::collections::btree_map::Range<'a, K, V>

impl<'a, K, V> Unpin for RangeMut<'a, K, V>

impl<'a, K, V> Unpin for VacantEntry<'a, K, V> where
    K: Unpin, 

impl<'a, K, V> Unpin for Values<'a, K, V>

impl<'a, K, V> Unpin for ValuesMut<'a, K, V>

impl<'a, K, V, F> Unpin for sp_std::collections::btree_map::DrainFilter<'a, K, V, F> where
    F: Unpin, 

impl<'a, P> Unpin for MatchIndices<'a, P> where
    <P as Pattern<'a>>::Searcher: Unpin, 

impl<'a, P> Unpin for Matches<'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 RMatches<'a, P> where
    <P as Pattern<'a>>::Searcher: Unpin, 

impl<'a, P> Unpin for sp_std::str::RSplit<'a, P> where
    <P as Pattern<'a>>::Searcher: Unpin, 

impl<'a, P> Unpin for sp_std::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 sp_std::str::Split<'a, P> where
    <P as Pattern<'a>>::Searcher: Unpin, 

impl<'a, P> Unpin for sp_std::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 Difference<'a, T>

impl<'a, T> Unpin for Intersection<'a, T>

impl<'a, T> Unpin for sp_std::collections::btree_set::Iter<'a, T>

impl<'a, T> Unpin for sp_std::collections::btree_set::Range<'a, T>

impl<'a, T> Unpin for SymmetricDifference<'a, T>

impl<'a, T> Unpin for Union<'a, T>

impl<'a, T> Unpin for sp_std::collections::vec_deque::Drain<'a, T>

impl<'a, T> Unpin for sp_std::collections::vec_deque::Iter<'a, T>

impl<'a, T> Unpin for sp_std::collections::vec_deque::IterMut<'a, T>

impl<'a, T> Unpin for sp_std::result::Iter<'a, T>

impl<'a, T> Unpin for sp_std::result::IterMut<'a, T>

impl<'a, T> Unpin for Chunks<'a, T>

impl<'a, T> Unpin for ChunksExact<'a, T>

impl<'a, T> Unpin for ChunksExactMut<'a, T>

impl<'a, T> Unpin for ChunksMut<'a, T>

impl<'a, T> Unpin for sp_std::slice::Iter<'a, T>

impl<'a, T> Unpin for sp_std::slice::IterMut<'a, T>

impl<'a, T> Unpin for RChunks<'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> Unpin for Windows<'a, T>

impl<'a, T> Unpin for sp_std::sync::mpsc::Iter<'a, T>

impl<'a, T> Unpin for TryIter<'a, T>

impl<'a, T, A> Unpin for sp_std::vec::Drain<'a, T, A>

impl<'a, T, F> Unpin for sp_std::collections::btree_set::DrainFilter<'a, T, F> where
    F: Unpin, 

impl<'a, T, F, A> Unpin for sp_std::vec::DrainFilter<'a, T, F, A> where
    F: Unpin, 

impl<'a, T, P> Unpin for GroupBy<'a, T, P> where
    P: Unpin, 

impl<'a, T, P> Unpin for GroupByMut<'a, T, P> where
    P: Unpin, 

impl<'a, T, P> Unpin for sp_std::slice::RSplit<'a, T, P> where
    P: Unpin, 

impl<'a, T, P> Unpin for RSplitMut<'a, T, P> where
    P: Unpin, 

impl<'a, T, P> Unpin for sp_std::slice::RSplitN<'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 sp_std::slice::Split<'a, T, P> where
    P: Unpin, 

impl<'a, T, P> Unpin for SplitMut<'a, T, P> where
    P: Unpin, 

impl<'a, T, P> Unpin for sp_std::slice::SplitN<'a, T, P> where
    P: Unpin, 

impl<'a, T, P> Unpin for SplitNMut<'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<'a, T: ?Sized> Unpin for MutexGuard<'a, T>

impl<'a, T: ?Sized> Unpin for RwLockReadGuard<'a, T>

impl<'a, T: ?Sized> Unpin for RwLockWriteGuard<'a, T>

impl<'b, T: ?Sized> Unpin for Ref<'b, T>

impl<'b, T: ?Sized> Unpin for RefMut<'b, T>

impl<A> Unpin for Repeat<A> where
    A: Unpin, 

impl<A, B> Unpin for Chain<A, B> where
    A: Unpin,
    B: Unpin, 

impl<A, B> Unpin for Zip<A, B> where
    A: Unpin,
    B: Unpin, 

impl<B, C> Unpin for ControlFlow<B, C> where
    B: Unpin,
    C: Unpin, 

impl<F> Unpin for FromFn<F> where
    F: Unpin, 

impl<F> Unpin for OnceWith<F> where
    F: Unpin, 

impl<F> Unpin for RepeatWith<F> where
    F: Unpin, 

impl<H> Unpin for BuildHasherDefault<H> where
    H: Unpin, 

impl<I> Unpin for Cloned<I> where
    I: Unpin, 

impl<I> Unpin for Copied<I> where
    I: Unpin, 

impl<I> Unpin for Cycle<I> where
    I: Unpin, 

impl<I> Unpin for Enumerate<I> where
    I: Unpin, 

impl<I> Unpin for Flatten<I> where
    I: Unpin,
    <<I as Iterator>::Item as IntoIterator>::IntoIter: Unpin, 

impl<I> Unpin for Fuse<I> where
    I: Unpin, 

impl<I> Unpin for Intersperse<I> where
    I: Unpin,
    <I as Iterator>::Item: Unpin, 

impl<I> Unpin for Peekable<I> where
    I: Unpin,
    <I as Iterator>::Item: Unpin, 

impl<I> Unpin for Skip<I> where
    I: Unpin, 

impl<I> Unpin for StepBy<I> where
    I: Unpin, 

impl<I> Unpin for Take<I> where
    I: Unpin, 

impl<I, F> Unpin for FilterMap<I, F> where
    F: Unpin,
    I: Unpin, 

impl<I, F> Unpin for Inspect<I, F> where
    F: Unpin,
    I: Unpin, 

impl<I, F> Unpin for Map<I, F> where
    F: Unpin,
    I: Unpin, 

impl<I, G> Unpin for IntersperseWith<I, G> where
    G: Unpin,
    I: Unpin,
    <I as Iterator>::Item: Unpin, 

impl<I, P> Unpin for Filter<I, P> where
    I: Unpin,
    P: Unpin, 

impl<I, P> Unpin for MapWhile<I, P> where
    I: Unpin,
    P: Unpin, 

impl<I, P> Unpin for SkipWhile<I, P> where
    I: Unpin,
    P: Unpin, 

impl<I, P> Unpin for TakeWhile<I, P> where
    I: Unpin,
    P: Unpin, 

impl<I, St, F> Unpin for Scan<I, St, F> where
    F: Unpin,
    I: Unpin,
    St: Unpin, 

impl<I, U, F> Unpin for FlatMap<I, U, F> where
    F: Unpin,
    I: Unpin,
    <U as IntoIterator>::IntoIter: Unpin, 

impl<Idx> Unpin for sp_std::ops::Range<Idx> where
    Idx: Unpin, 

impl<Idx> Unpin for RangeFrom<Idx> where
    Idx: Unpin, 

impl<Idx> Unpin for RangeInclusive<Idx> where
    Idx: Unpin, 

impl<Idx> Unpin for RangeTo<Idx> where
    Idx: Unpin, 

impl<Idx> Unpin for RangeToInclusive<Idx> where
    Idx: Unpin, 

impl<K, V> Unpin for BTreeMap<K, V>

impl<K, V> Unpin for sp_std::collections::btree_map::IntoIter<K, V>

impl<K, V> Unpin for IntoKeys<K, V>

impl<K, V> Unpin for IntoValues<K, V>

impl<T> Unpin for Bound<T> where
    T: Unpin, 

impl<T> Unpin for TryLockError<T> where
    T: Unpin, 

impl<T> Unpin for TrySendError<T> where
    T: Unpin, 

impl<T> Unpin for Reverse<T> where
    T: Unpin, 

impl<T> Unpin for BTreeSet<T>

impl<T> Unpin for sp_std::collections::btree_set::IntoIter<T>

impl<T> Unpin for sp_std::collections::vec_deque::IntoIter<T> where
    T: Unpin, 

impl<T> Unpin for VecDeque<T> where
    T: Unpin, 

impl<T> Unpin for Empty<T> where
    T: Unpin, 

impl<T> Unpin for sp_std::iter::Once<T> where
    T: Unpin, 

impl<T> Unpin for Rev<T> where
    T: Unpin, 

impl<T> Unpin for Discriminant<T>

impl<T> Unpin for Wrapping<T> where
    T: Unpin, 

impl<T> Unpin for sp_std::result::IntoIter<T> where
    T: Unpin, 

impl<T> Unpin for AtomicPtr<T>

impl<T> Unpin for sp_std::sync::mpsc::IntoIter<T>

impl<T> Unpin for Receiver<T>

impl<T> Unpin for SendError<T> where
    T: Unpin, 

impl<T> Unpin for Sender<T>

impl<T> Unpin for SyncSender<T>

impl<T> Unpin for PoisonError<T> where
    T: Unpin, 

impl<T> Unpin for MaybeUninit<T> where
    T: Unpin, 

impl<T, A> Unpin for sp_std::vec::IntoIter<T, A> where
    A: Unpin,
    T: Unpin, 

impl<T, A> Unpin for Vec<T, A> where
    A: Unpin,
    T: Unpin, 

impl<T, E> Unpin for Result<T, E> where
    E: Unpin,
    T: Unpin, 

impl<T, F> Unpin for Successors<T, F> where
    F: Unpin,
    T: Unpin, 

impl<T: ?Sized> Unpin for Cell<T> where
    T: Unpin, 

impl<T: ?Sized> Unpin for RefCell<T> where
    T: Unpin, 

impl<T: ?Sized> Unpin for UnsafeCell<T> where
    T: Unpin, 

impl<T: ?Sized> Unpin for PhantomData<T> where
    T: Unpin, 

impl<T: ?Sized> Unpin for ManuallyDrop<T> where
    T: Unpin, 

impl<T: ?Sized> Unpin for NonNull<T>

impl<T: ?Sized> Unpin for sp_std::rc::Weak<T>

impl<T: ?Sized> Unpin for Mutex<T> where
    T: Unpin, 

impl<T: ?Sized> Unpin for RwLock<T> where
    T: Unpin, 

impl<T: ?Sized> Unpin for sp_std::sync::Weak<T>

impl<Y, R> Unpin for GeneratorState<Y, R> where
    R: Unpin,
    Y: Unpin, 

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