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#[derive(Debug)]
struct Child<T> {
id: T,
children: Vec<usize>,
}
impl<T> Child<T> {
fn new(id: T) -> Self {
Child {
id,
children: vec![],
}
}
}
#[derive(Debug)]
pub(crate) struct ChildGraph<T>(Vec<Child<T>>);
impl<T> ChildGraph<T>
where
T: Sized + PartialEq + Clone,
{
pub(crate) fn with_capacity(s: usize) -> Self {
ChildGraph(Vec::with_capacity(s))
}
pub(crate) fn insert(&mut self, req: T) -> usize {
self.0.iter().position(|e| e.id == req).unwrap_or_else(|| {
let idx = self.0.len();
self.0.push(Child::new(req));
idx
})
}
pub(crate) fn insert_child(&mut self, parent: usize, child: T) -> usize {
let c_idx = self.0.len();
self.0.push(Child::new(child));
self.0[parent].children.push(c_idx);
c_idx
}
pub(crate) fn iter(&self) -> impl Iterator<Item = &T> {
self.0.iter().map(|r| &r.id)
}
pub(crate) fn contains(&self, req: &T) -> bool {
self.0.iter().any(|r| r.id == *req)
}
}