Method add_node

tangle/src/region.rs:130–143

(&mut self, token: &mut NodeOwner, mut n: T,
        f: F)

    }

    pub fn add_node<T, F, F_O>(&mut self, token: &mut NodeOwner, mut n: T,
        f: F) -> (NodeIdx, F_O) where F: FnOnce(&mut Node, &mut Region) -> F_O, T: NodeBehavior + 'static {
        use std::rc::Rc;
        let mut n = Node::new(token, box n as Box<dyn NodeBehavior>);
        n.containing_region = Some(self.idx);
        n.create_ports(token, self);
        let f_o = f(&mut n, self);
        let idx = self.nodes.add_node(n);
        // Now we can attach the ports to the actual node
        for port in self.nodes[idx].ports() {
            self.ports[port].node = Some(idx);
        }
        (idx, f_o)
    }

    pub fn add_port(&mut self) -> PortIdx {
        let p = Port::new();