class Selection

pub mut fn on<T>(c: Channel<T>, body: fn(?T) -> void throws Error): Selection

Adds a case, a receive from c, and returns the select. Its body gets what recv() would give — the value, or null once c is closed and empty.

pub mut fn timeout(d: Duration, body: fn() -> void throws Error): Selection

Sets the timeout and returns the select: body runs when no case could go on before d passed — with d of zero or less, when none can at once.

pub mut fn run(): void throws Error

Runs the select: the first case, in the order they were added, whose channel has a value or is closed runs at once. Else the running task waits on all of them, and the first channel to get a value or to close runs its case — or the timeout's body runs, once its time came first. One body runs, and only its case receives.

Errors

Throws what the chosen body throws; Cancelled in a cancelled task, where a cancel also ends the wait.