Trait CallbackPolicy 

pub trait CallbackPolicy: Clone + 'static {
    // Required methods
    fn capture(ctx: &Ctx<'_>) -> Option<Self>
       where Self: Sized;
    fn enter<R>(
        ctx: &Ctx<'_>,
        policy: Option<&Self>,
        f: impl FnOnce() -> R,
    ) -> R
       where Self: Sized;
}

Ambient host state that a scheduled callback must run under.

Required Methods

fn capture(ctx: &Ctx<'_>) -> Option<Self>

where Self: Sized,

The state in force right now, if any.

fn enter<R>(ctx: &Ctx<'_>, policy: Option<&Self>, f: impl FnOnce() -> R) -> R

where Self: Sized,

Run f with policy in force, restoring the caller’s state after.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl CallbackPolicy for NoPolicy