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use crate::prelude::*;
#[cfg(feature = "indexmap_1")]
use indexmap_1::IndexSet;
pub trait DuplicateInsertsLastWinsSet<T> {
fn new(size_hint: Option<usize>) -> Self;
/// Insert or replace the existing value
fn replace(&mut self, value: T);
}
#[cfg(feature = "std")]
impl<T, S> DuplicateInsertsLastWinsSet<T> for HashSet<T, S>
where
T: Eq + Hash,
S: BuildHasher + Default,
{
#[inline]
fn new(size_hint: Option<usize>) -> Self {
match size_hint {
Some(size) => Self::with_capacity_and_hasher(size, S::default()),
None => Self::with_hasher(S::default()),
}
}
#[inline]
fn replace(&mut self, value: T) {
// Hashset already fulfils the contract
self.replace(value);
}
}
#[cfg(feature = "indexmap_1")]
impl<T, S> DuplicateInsertsLastWinsSet<T> for IndexSet<T, S>
where
T: Eq + Hash,
S: BuildHasher + Default,
{
#[inline]
fn new(size_hint: Option<usize>) -> Self {
match size_hint {
Some(size) => Self::with_capacity_and_hasher(size, S::default()),
None => Self::with_hasher(S::default()),
}
}
#[inline]
fn replace(&mut self, value: T) {
// Hashset already fulfils the contract
self.replace(value);
}
}
impl<T> DuplicateInsertsLastWinsSet<T> for BTreeSet<T>
where
T: Ord,
{
#[inline]
fn new(_size_hint: Option<usize>) -> Self {
Self::new()
}
#[inline]
fn replace(&mut self, value: T) {
// BTreeSet already fulfils the contract
self.replace(value);
}
}