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use kind::*;
use std::collections::HashSet as StdHashSet;
use std::collections::hash_map::RandomState;
use std::hash::{BuildHasher, Hash};
use std::ops::{Deref, DerefMut};
use ops::*;
pub struct HashSet<T, S = RandomState>
{
hs: StdHashSet<T, S>
}
impl<T, S> HashSet<T, S> where
T: Eq + Hash,
S: BuildHasher
{
pub fn wrap(hs: StdHashSet<T, S>) -> HashSet<T, S> {
HashSet{hs: hs}
}
}
impl<T, S> Collection for HashSet<T, S> {
type Item = T;
}
impl<T, S> Deref for HashSet<T, S>
{
type Target = StdHashSet<T, S>;
fn deref<'a>(&'a self) -> &'a StdHashSet<T, S> {
&self.hs
}
}
impl<T, S> DerefMut for HashSet<T, S>
{
fn deref_mut<'a>(&'a mut self) -> &'a mut StdHashSet<T, S> {
&mut self.hs
}
}
impl<T, S> Contains for HashSet<T, S>
where T: Eq + Hash,
S: BuildHasher
{
contains_deref_impl!(T);
}
macro_rules! set_op_impl
{
( $( $t: ident, $m:ident );* ) =>
{$(
impl<T, S> $t for HashSet<T, S> where
T: Eq + Hash + Clone,
S: BuildHasher + Default
{
type Output = HashSet<T, S>;
fn $m(&self, other: &HashSet<T, S>) -> HashSet<T, S> {
HashSet::wrap(self.deref().$m(other).cloned().collect())
}
}
)*}
}
set_op_impl! {
Intersection, intersection;
Union, union;
Difference, difference;
SymmetricDifference, symmetric_difference
}