next(isolation:)

Declaration

mutating func next(isolation actor: isolated (any Actor)?) async throws -> Base.Element?

Discussion

This iterator calls next(isolation:) on its base iterator and evaluates the result with the predicate closure. As long as the predicate returns true, this method returns nil. After the predicate returns false, for a value received from the base iterator, this method returns that value. After that, the iterator returns values received from its base iterator as-is, and never executes the predicate closure again. If calling the closure throws an error, the sequence ends and next(isolation:) rethrows the error.