dsalgo 0.3.10

A package for Datastructures and Algorithms.
Documentation 
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use std::{
    cell::RefCell,
    rc::{
        Rc,
        Weak,
    },
};

use crate::new_rc_refcell::new_rc_refcell;

#[derive(Debug)]

pub struct Vertex<T, U> {
    pub value: T,
    pub edges: Vec<Edge<U, T>>,
}

impl<T: std::fmt::Debug, U> std::fmt::Display for Vertex<T, U> {
    fn fmt(
        &self,
        f: &mut std::fmt::Formatter,
    ) -> std::fmt::Result {
        write!(f, "Vertex {{ value: {:#?}, edges: [...] }}", self.value)
    }
}

impl<T, U> Vertex<T, U> {
    pub(crate) fn new(value: T) -> Self {
        Self { edges: Vec::new(), value }
    }

    pub fn new_rc_refcell(value: T) -> Rc<RefCell<Self>> {
        new_rc_refcell(Self::new(value))
    }

    pub fn connect(
        from: &Rc<RefCell<Self>>,
        to: &Rc<RefCell<Self>>,
        edge_data: U,
    ) {
        from.borrow_mut().edges.push(Edge::new(from, to.clone(), edge_data));
    }
}

#[derive(Debug)]

pub struct Edge<T, U> {
    pub value: T,
    pub from: Option<Weak<RefCell<Vertex<U, T>>>>,
    pub to: Rc<RefCell<Vertex<U, T>>>,
}

impl<T: std::fmt::Debug, U> std::fmt::Display for Edge<T, U> {
    fn fmt(
        &self,
        f: &mut std::fmt::Formatter,
    ) -> std::fmt::Result {
        write!(f, "Edge {{ from: ., to: ., value: {:#?} }}", self.value)
    }
}

impl<T, U> Edge<T, U> {
    pub(crate) fn new(
        from: &Rc<RefCell<Vertex<U, T>>>,
        to: Rc<RefCell<Vertex<U, T>>>,
        value: T,
    ) -> Self {
        Self { from: Some(Rc::downgrade(from)), to, value }
    }
}

#[cfg(test)]

mod tests {

    use super::*;
    use crate::new_rc_refcell::new_rc_refcell;

    #[test]

    fn test() {
        type V = Vertex<Option<usize>, Rc<RefCell<usize>>>;

        let a = V::new_rc_refcell(None);

        let b = V::new_rc_refcell(Some(1));

        dbg!(&a.borrow());

        V::connect(&a, &b, new_rc_refcell(1));

        dbg!(&a.borrow());

        dbg!(&b.borrow());

        *a.borrow().edges[0].value.borrow_mut() += 1;

        dbg!(&a.borrow());
    }
}