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use std::fmt::{self, Debug};
use std::slice;
pub use self::ordered::OrderedSet;
pub use self::unordered::UnorderedSet;
mod ordered {
use super::{Iter, UnorderedSet};
use std::borrow::Borrow;
use std::hash::Hash;
pub struct OrderedSet<T> {
set: UnorderedSet<T>,
vec: Vec<T>,
}
impl<'a, T> OrderedSet<&'a T>
where
T: Hash + Eq,
{
pub fn new() -> Self {
OrderedSet {
set: UnorderedSet::new(),
vec: Vec::new(),
}
}
pub fn insert(&mut self, value: &'a T) -> bool {
let new = self.set.insert(value);
if new {
self.vec.push(value);
}
new
}
pub fn contains<Q>(&self, value: &Q) -> bool
where
&'a T: Borrow<Q>,
Q: ?Sized + Hash + Eq,
{
self.set.contains(value)
}
pub fn get<Q>(&self, value: &Q) -> Option<&'a T>
where
&'a T: Borrow<Q>,
Q: ?Sized + Hash + Eq,
{
self.set.get(value).copied()
}
}
impl<'s, 'a, T> IntoIterator for &'s OrderedSet<&'a T> {
type Item = &'a T;
type IntoIter = Iter<'s, 'a, T>;
fn into_iter(self) -> Self::IntoIter {
Iter(self.vec.iter())
}
}
}
mod unordered {
use std::borrow::Borrow;
use std::collections::HashSet;
use std::hash::Hash;
// Wrapper prohibits accidentally introducing iteration over the set, which
// could lead to nondeterministic generated code.
pub struct UnorderedSet<T>(HashSet<T>);
impl<T> UnorderedSet<T>
where
T: Hash + Eq,
{
pub fn new() -> Self {
UnorderedSet(HashSet::new())
}
pub fn insert(&mut self, value: T) -> bool {
self.0.insert(value)
}
pub fn contains<Q>(&self, value: &Q) -> bool
where
T: Borrow<Q>,
Q: ?Sized + Hash + Eq,
{
self.0.contains(value)
}
pub fn get<Q>(&self, value: &Q) -> Option<&T>
where
T: Borrow<Q>,
Q: ?Sized + Hash + Eq,
{
self.0.get(value)
}
}
}
pub struct Iter<'s, 'a, T>(slice::Iter<'s, &'a T>);
impl<'s, 'a, T> Iterator for Iter<'s, 'a, T> {
type Item = &'a T;
fn next(&mut self) -> Option<Self::Item> {
self.0.next().copied()
}
}
impl<'a, T> Debug for OrderedSet<&'a T>
where
T: Debug,
{
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.debug_set().entries(self).finish()
}
}
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