1.33.0[−][src]Trait ontio_std::prelude::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<T> Unpin for Pending<T>
[src]
impl<F> Unpin for PollFn<F>
[src]
impl !Unpin for PhantomPinned
[src]
impl Unpin for Waker
[src]
impl<T> Unpin for Ready<T>
[src]
impl<T> Unpin for Rc<T> where
T: ?Sized,
[src]
T: ?Sized,
impl<T> Unpin for Arc<T> where
T: ?Sized,
[src]
Loading content...T: ?Sized,
Implementors
impl<'a, T> Unpin for &'a T where
T: 'a + ?Sized,
[src]
T: 'a + ?Sized,
impl<'a, T> Unpin for &'a mut T where
T: 'a + ?Sized,
[src]
T: 'a + ?Sized,
impl<T> Unpin for *const T where
T: ?Sized,
[src]
T: ?Sized,
impl<T> Unpin for *mut T where
T: ?Sized,
[src]
T: ?Sized,
impl<T, A> Unpin for Box<T, A> where
A: Allocator + 'static,
T: ?Sized,
[src]
A: Allocator + 'static,
T: ?Sized,
Auto implementors
impl Unpin for Error
impl Unpin for Ordering
impl Unpin for SearchStep
impl Unpin for EventBuilder
impl Unpin for Sink
impl Unpin for VmValueBuilder
impl Unpin for DDOAttribute
impl Unpin for Group
impl Unpin for Signer
impl Unpin for TransferParam
impl Unpin for ParseBoolError
impl Unpin for Utf8Error
impl Unpin for FromUtf8Error
impl Unpin for FromUtf16Error
impl Unpin for I128
impl Unpin for String
impl Unpin for U128
impl Unpin for H160
impl Unpin for H256
impl Unpin for U256
impl Unpin for [u8]
impl Unpin for bool
impl Unpin for char
impl Unpin for f32
impl Unpin for f64
impl Unpin for i8
impl Unpin for i16
impl Unpin for i32
impl Unpin for i64
impl Unpin for i128
impl Unpin for isize
impl Unpin for str
impl Unpin for u8
impl Unpin for u16
impl Unpin for u32
impl Unpin for u64
impl Unpin for u128
impl Unpin for usize
impl<'a> Unpin for Source<'a>
impl<'a> Unpin for VmValueParser<'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> Unpin for ontio_std::prelude::string::Drain<'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: MultiCharEq + Unpin,
F: MultiCharEq + Unpin,
impl<'a, I, A> Unpin for Splice<'a, I, A> where
I: Unpin,
I: Unpin,
impl<'a, P> Unpin for MatchIndices<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, P> Unpin for Matches<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, P> Unpin for RMatchIndices<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, P> Unpin for RMatches<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, P> Unpin for RSplit<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, P> Unpin for RSplitN<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, P> Unpin for RSplitTerminator<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, P> Unpin for Split<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, P> Unpin for SplitN<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, P> Unpin for SplitTerminator<'a, P> where
<P as Pattern<'a>>::Searcher: Unpin,
<P as Pattern<'a>>::Searcher: Unpin,
impl<'a, T, A> Unpin for ontio_std::prelude::vec::Drain<'a, T, A>
impl<'a, T, F, A> Unpin for DrainFilter<'a, T, F, A> where
F: Unpin,
F: Unpin,
impl<T> Unpin for Option<T> where
T: Unpin,
T: Unpin,
impl<T> Unpin for ListStore<T>
impl<T> Unpin for Reverse<T> where
T: Unpin,
T: Unpin,
impl<T> Unpin for [T] where
T: Unpin,
T: Unpin,
impl<T, A> Unpin for IntoIter<T, A> where
A: Unpin,
T: Unpin,
A: Unpin,
T: Unpin,
impl<T, A> Unpin for Vec<T, A> where
A: Unpin,
T: Unpin,
A: Unpin,
T: Unpin,
impl<T, E> Unpin for Result<T, E> where
E: Unpin,
T: Unpin,
E: Unpin,
T: Unpin,
impl<T, const N: usize> Unpin for [T; N] where
T: Unpin,
T: Unpin,