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Introduce a new TreeSet struct in sum_tree

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This is just a special case of `TreeMap<K, V>` where `V = ()`.
This commit is contained in:
Antonio Scandurra 2022-07-18 13:40:30 +02:00
parent f9a5ed3a85
commit df33556693
2 changed files with 32 additions and 1 deletions
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2
crates/sum_tree/src/sum_tree.rs
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@ -5,7 +5,7 @@ use arrayvec::ArrayVec;
pub use cursor::{Cursor, FilterCursor, Iter};
use std::marker::PhantomData;
use std::{cmp::Ordering, fmt, iter::FromIterator, sync::Arc};
pub use tree_map::TreeMap;
pub use tree_map::{TreeMap, TreeSet};
#[cfg(test)]
const TREE_BASE: usize = 2;

31
crates/sum_tree/src/tree_map.rs
View file

@ -20,6 +20,11 @@ pub struct MapKey<K>(K);
#[derive(Clone, Debug, Default)]
pub struct MapKeyRef<'a, K>(Option<&'a K>);
#[derive(Clone)]
pub struct TreeSet<K>(TreeMap<K, ()>)
where
K: Clone + Debug + Default + Ord;
impl<K: Clone + Debug + Default + Ord, V: Clone + Debug> TreeMap<K, V> {
pub fn from_ordered_entries(entries: impl IntoIterator<Item = (K, V)>) -> Self {
let tree = SumTree::from_iter(
@ -136,6 +141,32 @@ where
}
}
impl<K> Default for TreeSet<K>
where
K: Clone + Debug + Default + Ord,
{
fn default() -> Self {
Self(Default::default())
}
}
impl<K> TreeSet<K>
where
K: Clone + Debug + Default + Ord,
{
pub fn insert(&mut self, key: K) {
self.0.insert(key, ());
}
pub fn contains(&self, key: &K) -> bool {
self.0.get(key).is_some()
}
pub fn iter<'a>(&'a self) -> impl 'a + Iterator<Item = &'a K> {
self.0.iter().map(|(k, _)| k)
}
}
#[cfg(test)]
mod tests {
use super::*;