Trait scale_info::prelude::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<T> Unpin for *mut T where
    T: ?Sized, 

impl<F> Unpin for PollFn<F>

impl<T> Unpin for Pending<T>

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

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

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

impl<T> Unpin for Ready<T>

impl Unpin for Waker

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

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

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Auto implementors

impl Unpin for Fieldless

impl Unpin for Fields

impl Unpin for NamedFields

impl Unpin for NoFields

impl Unpin for NoVariants

impl Unpin for UnnamedFields

impl Unpin for VariantFields

impl Unpin for Variants

impl Unpin for PathAssigned

impl Unpin for PathNotAssigned

impl Unpin for PathError

impl Unpin for TypeDefPrimitive

impl Unpin for MetaForm

impl Unpin for Ordering

impl Unpin for TryReserveError

impl Unpin for scale_info::prelude::fmt::Alignment

impl Unpin for FpCategory

impl Unpin for IntErrorKind

impl Unpin for TypeId

impl Unpin for DefaultHasher

impl Unpin for RandomState

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 FromUtf8Error

impl Unpin for FromUtf16Error

impl Unpin for String

impl Unpin for MetaType

impl Unpin for Registry

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

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

impl<'a> Unpin for scale_info::prelude::string::Drain<'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, I, A> Unpin for Splice<'a, I, A> where
    I: Unpin, 

impl<'a, K> Unpin for scale_info::prelude::collections::hash_set::Drain<'a, K> where
    K: Unpin, 

impl<'a, K> Unpin for scale_info::prelude::collections::hash_set::Iter<'a, K>

impl<'a, K, F> Unpin for scale_info::prelude::collections::hash_set::DrainFilter<'a, K, F> where
    F: Unpin, 

impl<'a, K, V> Unpin for scale_info::prelude::collections::btree_map::Entry<'a, K, V> where
    K: Unpin, 

impl<'a, K, V> Unpin for scale_info::prelude::collections::hash_map::Entry<'a, K, V> where
    K: Unpin, 

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

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

impl<'a, K, V> Unpin for scale_info::prelude::collections::btree_map::Keys<'a, K, V>

impl<'a, K, V> Unpin for scale_info::prelude::collections::btree_map::OccupiedEntry<'a, K, V>

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

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

impl<'a, K, V> Unpin for scale_info::prelude::collections::btree_map::VacantEntry<'a, K, V> where
    K: Unpin, 

impl<'a, K, V> Unpin for scale_info::prelude::collections::btree_map::Values<'a, K, V>

impl<'a, K, V> Unpin for scale_info::prelude::collections::btree_map::ValuesMut<'a, K, V>

impl<'a, K, V> Unpin for scale_info::prelude::collections::hash_map::Drain<'a, K, V> where
    K: Unpin,
    V: Unpin, 

impl<'a, K, V> Unpin for scale_info::prelude::collections::hash_map::Iter<'a, K, V>

impl<'a, K, V> Unpin for scale_info::prelude::collections::hash_map::IterMut<'a, K, V>

impl<'a, K, V> Unpin for scale_info::prelude::collections::hash_map::Keys<'a, K, V>

impl<'a, K, V> Unpin for scale_info::prelude::collections::hash_map::OccupiedEntry<'a, K, V> where
    K: Unpin, 

impl<'a, K, V> Unpin for scale_info::prelude::collections::hash_map::VacantEntry<'a, K, V> where
    K: Unpin, 

impl<'a, K, V> Unpin for scale_info::prelude::collections::hash_map::Values<'a, K, V>

impl<'a, K, V> Unpin for scale_info::prelude::collections::hash_map::ValuesMut<'a, K, V>

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

impl<'a, K, V, F> Unpin for scale_info::prelude::collections::hash_map::DrainFilter<'a, K, V, F> where
    F: Unpin, 

impl<'a, K, V, S> Unpin for RawEntryMut<'a, K, V, S>

impl<'a, K, V, S> Unpin for RawEntryBuilder<'a, K, V, S>

impl<'a, K, V, S> Unpin for RawEntryBuilderMut<'a, K, V, S>

impl<'a, K, V, S> Unpin for RawOccupiedEntryMut<'a, K, V, S>

impl<'a, K, V, S> Unpin for RawVacantEntryMut<'a, K, V, S>

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

impl<'a, T> Unpin for scale_info::prelude::collections::binary_heap::Drain<'a, T>

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

impl<'a, T> Unpin for scale_info::prelude::collections::binary_heap::Iter<'a, T>

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

impl<'a, T> Unpin for scale_info::prelude::collections::btree_set::Difference<'a, T>

impl<'a, T> Unpin for scale_info::prelude::collections::btree_set::Intersection<'a, T>

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

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

impl<'a, T> Unpin for scale_info::prelude::collections::btree_set::SymmetricDifference<'a, T>

impl<'a, T> Unpin for scale_info::prelude::collections::btree_set::Union<'a, T>

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

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

impl<'a, T> Unpin for scale_info::prelude::collections::linked_list::Iter<'a, T>

impl<'a, T> Unpin for scale_info::prelude::collections::linked_list::IterMut<'a, T>

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

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

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

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

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

impl<'a, T, F> Unpin for scale_info::prelude::collections::linked_list::DrainFilter<'a, T, F> where
    F: Unpin, 

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

impl<'a, T, S> Unpin for scale_info::prelude::collections::hash_set::Difference<'a, T, S>

impl<'a, T, S> Unpin for scale_info::prelude::collections::hash_set::Intersection<'a, T, S>

impl<'a, T, S> Unpin for scale_info::prelude::collections::hash_set::SymmetricDifference<'a, T, S>

impl<'a, T, S> Unpin for scale_info::prelude::collections::hash_set::Union<'a, T, S>

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

impl<K> Unpin for scale_info::prelude::collections::hash_set::IntoIter<K> where
    K: Unpin, 

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

impl<K, V> Unpin for scale_info::prelude::collections::btree_map::IntoKeys<K, V>

impl<K, V> Unpin for scale_info::prelude::collections::btree_map::IntoValues<K, V>

impl<K, V> Unpin for scale_info::prelude::collections::hash_map::IntoIter<K, V> where
    K: Unpin,
    V: Unpin, 

impl<K, V> Unpin for scale_info::prelude::collections::hash_map::IntoKeys<K, V> where
    K: Unpin,
    V: Unpin, 

impl<K, V> Unpin for scale_info::prelude::collections::hash_map::IntoValues<K, V> where
    K: Unpin,
    V: Unpin, 

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

impl<K, V, S> Unpin for HashMap<K, V, S> where
    K: Unpin,
    S: Unpin,
    V: Unpin, 

impl<S> Unpin for TypeBuilder<S>

impl<S> Unpin for PortableForm<S> where
    S: Unpin, 

impl<S> Unpin for PortableRegistry<S> where
    S: Unpin, 

impl<T> Unpin for TypeDef<T> where
    <T as Form>::String: Unpin,
    <T as Form>::Type: Unpin, 

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

impl<T> Unpin for FieldsBuilder<T>

impl<T> Unpin for VariantsBuilder<T>

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

impl<T> Unpin for UntrackedSymbol<T>

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

impl<T> Unpin for scale_info::prelude::collections::binary_heap::IntoIter<T> where
    T: Unpin, 

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

impl<T> Unpin for scale_info::prelude::collections::btree_set::IntoIter<T>

impl<T> Unpin for scale_info::prelude::collections::linked_list::IntoIter<T>

impl<T> Unpin for BTreeSet<T>

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

impl<T> Unpin for LinkedList<T>

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

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

impl<T> Unpin for Discriminant<T>

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

impl<T> Unpin for Field<T> where
    <T as Form>::String: Unpin,
    <T as Form>::Type: Unpin, 

impl<T> Unpin for Path<T> where
    <T as Form>::String: Unpin, 

impl<T> Unpin for Type<T> where
    <T as Form>::String: Unpin,
    <T as Form>::Type: Unpin, 

impl<T> Unpin for TypeDefArray<T> where
    <T as Form>::Type: Unpin, 

impl<T> Unpin for TypeDefComposite<T> where
    <T as Form>::String: Unpin,
    <T as Form>::Type: Unpin, 

impl<T> Unpin for TypeDefPhantom<T> where
    <T as Form>::Type: Unpin, 

impl<T> Unpin for TypeDefSequence<T> where
    <T as Form>::Type: Unpin, 

impl<T> Unpin for TypeDefTuple<T> where
    <T as Form>::Type: Unpin, 

impl<T> Unpin for TypeDefVariant<T> where
    <T as Form>::String: Unpin,
    <T as Form>::Type: Unpin, 

impl<T> Unpin for Variant<T> where
    <T as Form>::String: Unpin,
    <T as Form>::Type: Unpin, 

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

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

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

impl<T, S> Unpin for HashSet<T, S> where
    S: Unpin,
    T: Unpin, 

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

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

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