[][src]Trait futures::future::UnsafeFutureObj

pub unsafe trait UnsafeFutureObj<'a, T>: 'a {
    fn into_raw(self) -> *mut ();
unsafe fn poll(ptr: *mut (), lw: &LocalWaker) -> Poll<T>;
unsafe fn drop(ptr: *mut ()); }

A custom implementation of a future trait object for FutureObj, providing a hand-rolled vtable.

This custom representation is typically used only in no_std contexts, where the default Box-based implementation is not available.

The implementor must guarantee that it is safe to call poll repeatedly (in a non-concurrent fashion) with the result of into_raw until drop is called.

Required Methods

Convert an owned instance into a (conceptually owned) void pointer.

Poll the future represented by the given void pointer.

Safety

The trait implementor must guarantee that it is safe to repeatedly call poll with the result of into_raw until drop is called; such calls are not, however, allowed to race with each other or with calls to drop.

Drops the future represented by the given void pointer.

Safety

The trait implementor must guarantee that it is safe to call this function once per into_raw invocation; that call cannot race with other calls to drop or poll.

Implementations on Foreign Types

impl<'a, T, F> UnsafeFutureObj<'a, T> for Pin<&'a mut F> where
    F: Future<Output = T> + 'a, 
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impl<'a, T, F> UnsafeFutureObj<'a, T> for &'a mut F where
    F: Future<Output = T> + Unpin + 'a, 
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impl<'a, T, F> UnsafeFutureObj<'a, T> for Box<F> where
    F: Future<Output = T> + 'a, 
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impl<'a, T, F> UnsafeFutureObj<'a, T> for Pin<Box<F>> where
    F: Future<Output = T> + 'a, 
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Implementors