# 1.33.0[−][src]Trait core::marker::Unpin

    pub auto trait Unpin { }

Types which can be safely moved after being pinned.

Since Rust itself has no notion of immovable types, and will consider moves to always be safe, this trait cannot prevent types from moving by itself.

Instead it can be used to prevent moves through the type system, by controlling the behavior of pointers wrapped in the `Pin` wrapper, which "pin" the type in place by not allowing it to be moved out of them. See the `pin module` documentation for more information on pinning.

Implementing this trait lifts the restrictions of pinning off a type, which then allows it to move out with functions such as `replace`.

So this, for example, can only be done on types implementing `Unpin`:

    use std::mem::replace;
    use std::pin::Pin;

    let mut string = "this".to_string();
    let mut pinned_string = Pin::new(&mut string);

    // dereferencing the pointer mutably is only possible because String implements Unpin
    replace(&mut *pinned_string, "other".to_string());Run

This trait is automatically implemented for almost every type.

## Implementors

###

`impl !Unpin for PhantomPinned` | [src]

###

`impl Unpin for LocalWaker` | [src]

###

`impl Unpin for Waker` | [src]

###

`impl<'a, T: ?Sized + 'a> Unpin for &'a T` | [src]

###

`impl<'a, T: ?Sized + 'a> Unpin for &'a mut T` | [src]

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## Auto implementors

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