fn dequeue_next_task(&mut self) -> Option<NodeId> {
        if let Some((node_id, _)) = self.runnable.pop() {
            let id = node_id.id();
            debug_assert!(id < self.tasks.len());

            // Update its successor dependencies.

            // Don't use iterator, as we will borrow `tasks` again below.
            for i in 0..self.tasks[id].successors.len() {
                let succ_id = self.tasks[id].successors[i];
                debug_assert!(succ_id.id() < self.tasks.len());
                let successor = &mut self.tasks[succ_id.id()];
                debug_assert!(successor.unsatisfied_dependencies != 0);
                successor.unsatisfied_dependencies -= 1;
                if successor.unsatisfied_dependencies == 0 && successor.is_ready {
                    self.runnable.push(successor);
                }
            }
            Some(node_id)
        } else {
            None
        }
    }
/// Dequeue a highest-priority task from the runnable queue.
/// Update all successors of the task, reducing their unsatisfied
/// dependencies by 1.  Move successors to the runnable queue
/// when possible.
Dequeue a highest-priority task from the runnable queue.
Update all successors of the task, reducing their unsatisfied
dependencies by 1.  Move successors to the runnable queue
when possible.
Dequeue a highest - priority task from the runnable queue . Update all successors of the task reducing their unsatisfied dependencies by 1 . Move successors to the runnable queue when possible .
fn dequeue_next_task(&mut self) -> Option<NodeId> {
        if let Some((node_id, _)) = self.runnable.pop() {
            let id = node_id.id();
            debug_assert!(id < self.tasks.len());
            // Update its successor dependencies.
            // Don't use iterator, as we will borrow `tasks` again below.
            for i in 0..self.tasks[id].successors.len() {
                let succ_id = self.tasks[id].successors[i];
                debug_assert!(succ_id.id() < self.tasks.len());
                let successor = &mut self.tasks[succ_id.id()];
                debug_assert!(successor.unsatisfied_dependencies != 0);
                successor.unsatisfied_dependencies -= 1;
                if successor.unsatisfied_dependencies == 0 && successor.is_ready {
                    self.runnable.push(successor);
                }
            }
            Some(node_id)
        } else {
            None
        }
    }
fn dequeue_next_task ( & mut self ) -> Option < NodeId > { if let Some ( ( node_id , _ ) ) = self . runnable . pop ( ) { let id = node_id . id ( ) ; debug_assert ! ( id self tasks len ( ) ) ; // Update its successor dependencies. // Don't use iterator, as we will borrow `tasks` again below. for i in 0 .. self . tasks [ id ] . successors . len ( ) { let succ_id = self . tasks [ id ] . successors [ i ] ; debug_assert ! ( succ_id id ( ) self tasks len ( ) ) ; let successor = & mut self . tasks [ succ_id . id ( ) ] ; debug_assert ! ( successor unsatisfied_dependencies 0 ) ; successor . unsatisfied_dependencies -= 1 ; if successor . unsatisfied_dependencies == 0 && successor . is_ready { self . runnable . push ( successor ) ; } } Some ( node_id ) } else { None } }
Dequeue a highest-priority task from the runnable queue.
Dequeue a highest - priority task from the runnable queue .
&mut self