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use crate::edge::CompactDirection;
use indexmap::map::Keys;
use std::fmt::Debug;
use std::hash::Hash;
use std::iter::Cloned;
pub trait NodeTrait: Copy + Debug + Hash + Ord {}
impl<N> NodeTrait for N where N: Copy + Debug + Hash + Ord {}
pub struct Nodes<'a, N: 'a + NodeTrait> {
iter: Cloned<Keys<'a, N, Vec<(N, CompactDirection)>>>,
}
impl<'a, N: 'a + NodeTrait> Nodes<'a, N> {
pub fn new(iter: Cloned<Keys<'a, N, Vec<(N, CompactDirection)>>>) -> Self {
Self { iter }
}
}
impl<'a, N: 'a + NodeTrait> Iterator for Nodes<'a, N> {
type Item = N;
#[inline]
fn next(&mut self) -> Option<Self::Item> {
self.iter.next()
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
}
#[cfg(test)]
mod tests {
use crate::edge::CompactDirection;
use crate::node::Nodes;
use indexmap::IndexMap;
#[test]
fn new() {
let nodes: IndexMap<i32, Vec<(i32, CompactDirection)>> = IndexMap::new();
Nodes::new(nodes.keys().cloned());
}
#[test]
fn next() {
let mut nodes: IndexMap<i32, Vec<(i32, CompactDirection)>> = IndexMap::with_capacity(3);
nodes.insert(1, vec![]);
nodes.insert(2, vec![]);
nodes.insert(3, vec![]);
let mut nodes = Nodes::new(nodes.keys().cloned());
assert_eq!(nodes.next(), Some(1));
assert_eq!(nodes.next(), Some(2));
assert_eq!(nodes.next(), Some(3));
assert_eq!(nodes.next(), None);
}
#[test]
fn size_hint() {
let mut nodes: IndexMap<i32, Vec<(i32, CompactDirection)>> = IndexMap::with_capacity(3);
nodes.insert(1, vec![]);
nodes.insert(2, vec![]);
nodes.insert(3, vec![]);
let mut nodes = Nodes::new(nodes.keys().cloned());
assert_eq!(nodes.size_hint(), (3, Some(3)));
nodes.next();
assert_eq!(nodes.size_hint(), (2, Some(2)));
nodes.next();
assert_eq!(nodes.size_hint(), (1, Some(1)));
nodes.next();
assert_eq!(nodes.size_hint(), (0, Some(0)));
}
}