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use std::cell::{Cell, RefCell};
use std::rc::Rc;

type RefNode = Rc<NodeTrait>;

trait NodeTrait {
    fn id(&self) -> usize {
        0
    }
    fn set_id(&self, id: usize);

wdevore

use std::cell::RefCell;
use std::rc::Rc;

trait NodeTrait {
    fn get_x(&self) -> f32;
    fn add(&mut self, v: f32);
    fn step(&mut self);
    fn process(&mut self);
    fn replacement(&self) -> &Option<RNode> {
        &None

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// See this users response
// https://users.rust-lang.org/t/typical-cant-borrow-issue/24817

trait NodeTrait {
    fn get_x(&self) -> f32;
    fn add(&mut self, v: f32);
    fn step(&mut self);
    fn process(&mut self);
    fn print(&self) {
        println!("node: {}", self.get_x());

wdevore

use std::cell::RefCell;
use std::rc::Rc;

type RefNode = Rc<RefCell<NodeTrait>>;
type RefTransform = Rc<RefCell<TransformProperty>>;

trait NodeTrait {
    fn id(&self) -> usize {
        0
    }

wdevore

// https://www.snoyman.com/blog/2018/11/rust-crash-course-05-rule-of-three

#[derive(Debug)]
struct Person {
    name: String,
    age: u32,
}

fn birthday_immutable(person: &mut Person) {
    person.age += 1;

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// How to extract Option from Cell
pub struct X {
  replacement: Cell<Option<usize>>,
...
}

fn get_transition_node(&self) -> usize {
    if let Some(rep) = &*self.replacement.borrow() {
        let repl = rep.borrow();
        return repl.data().borrow().node.id();

wdevore

// 4bit up counter - top.v
// This is expects a pcf specific to the tinyFPGA-B2 board

module top (
   pin1_usb_dp,        // USB pull-up enable, set low to disable
   pin2_usb_dn,
   pin3_clk_16mhz,     // 16 MHz on-board clock
   pin13,              // Reset, active high, synchonous reset input
   pin12,              // Enable, active high on counter
   pin11,              // MSB output pin

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// shift_register - top.v
//
// Description:
// shifts bits to left
// Pins are defined in pins.pcf file.
//

// out <-- pin13, pin12, pin11, pin10...,pin6  <-- pin5 in

module top (

wdevore

// cylon effect - top.v
//
// pins are relative to the tinyFPGA-B2
// I really need to stop using reg bits and use a vector. <-- lazy person.

module top (
   output pin1_usb_dp,// USB pull-up enable, set low to disable
   output pin2_usb_dn,
   input  pin3_clk_16mhz,   // 16 MHz on-board clock
   output pin13,

wdevore

// cylon effect - top.v
//
// pins are relative to the tinyFPGA-B2

module top (
   output pin1_usb_dp,// USB pull-up enable, set low to disable
   output pin2_usb_dn,
   input  pin3_clk_16mhz,   // 16 MHz on-board clock
   output pin13,
   output pin12,