Struct Scope

pub struct Scope<'env> { /* private fields */ }

A Scope is used to register callbacks. See Scope::register.

Implementations

impl<'env> Scope<'env>

pub fn register<'scope, A: 'static, R: 'static, H: 'static>( &'scope self, c: impl FnMut(A) -> R + 'env, register: impl FnOnce(Box<dyn FnMut(A) -> R>) -> H + 'env, deregister: impl FnOnce(H) + 'env, ) -> Registered<'env, 'scope>

Register the function c with local lifetime 'env using the register and deregister functions that handle only 'static lifetime functions. The returned Registered object will, when dropped, invoke the deregister function.

If the Registered object is std::mem::forget-ed, Scope::drop will perform the de-registration.

Note: If the callback passed to the register function is invoked after deregister has been invoked, the callback will panic!.

pub fn future<'scope>( &'scope self, future: LocalBoxFuture<'env, ()>, ) -> impl Future<Output = ()> + 'static

Wrap a scoped Future into one with a 'static lifetime. Future::poll will panic! if called after the scope has been dropped.

Trait Implementations

impl<'env> Drop for Scope<'env>

fn drop(&mut self)

Executes the destructor for this type.