Trait cgp_async::Async

pub trait Async:
    Sized
    + Send
    + Sync
    + 'static { }

This is defined as a convenient constraint alias to Sized + Send + Sync + 'static.

This constraint is commonly required to be present in almost all associated types. The Sized constraint is commonly required for associated types to be used as generic parameters. The Send + Sync + 'static constraints are important for the use of async functions inside traits.

Because Rust do not currently natively support the use of async functions in traits, we use the async_trait crate to desugar async functions inside traits into functions returning Pin<Box<dyn Future + Send>>. Due to the additional Send and lifetime trait bounds inside the returned boxed future, almost all values that are used inside the async functions are required to have types that implement Send and Sync.

It is also common to require the associated types to have the 'static lifetime for them to be used inside async functions, because Rust would otherwise infer a more restrictive lifetime that does not outlive the async functions. The 'static lifetime constraint here really means that the types implementing Async must not contain any lifetime parameter.

Object Safety

This trait is not object safe.

Implementors

impl<A> Async for A

where A: Sized + Send + Sync + 'static,