Struct FutureBackCaller

pub struct FutureBackCaller<A: Application> { /* private fields */ }

Helper type to get the application arguments during an idle future.

Idle futures don’t have access to the main application, because they must be 'static. But calling FutureBackCaller::run a future can use the application data freely. The main limitation is that you can’t await inside run, obviously. Another limitation is that you can’t call run recursively, because it returns a mutable (exclusive) reference to the application.

Implementations

impl<A: Application> FutureBackCaller<A>

pub fn run<F, R>(&self, f: F) -> Option<R>

where F: FnOnce(&mut A, Args<'_, A>) -> R,

Runs the given function with the current application as argument.

It returns Some(x) being x the return value of your function. If you call it recursively, or from a function outside of an idle future it will return None.