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#[derive(Clone)]
pub struct VecMap<K, V> {
vec: Vec<(K, V)>,
}
impl<K: PartialEq, V> VecMap<K, V> {
#[inline]
pub fn with_capacity(cap: usize) -> VecMap<K, V> {
VecMap {
vec: Vec::with_capacity(cap)
}
}
#[inline]
pub fn insert(&mut self, key: K, value: V) {
for entry in &mut self.vec {
if key == entry.0 {
*entry = (key, value);
return;
}
}
self.vec.push((key, value));
}
pub fn insert_pos(&mut self, key: K, value: V, pos: usize) {
debug_assert!(!self.contains_key(&key));
self.vec.insert(pos, (key, value))
}
#[inline]
pub fn append(&mut self, key: K, value: V) {
self.vec.push((key, value));
}
#[inline]
pub fn entry(&mut self, key: K) -> Entry<K, V> {
match self.pos(&key) {
Some(pos) => Entry::Occupied(OccupiedEntry {
vec: &mut self.vec,
pos: pos,
}),
None => Entry::Vacant(VacantEntry {
vec: &mut self.vec,
key: key,
})
}
}
#[inline]
pub fn get<K2: PartialEq<K> + ?Sized>(&self, key: &K2) -> Option<&V> {
self.find(key).map(|entry| &entry.1)
}
#[inline]
pub fn get_mut<K2: PartialEq<K> + ?Sized>(&mut self, key: &K2) -> Option<&mut V> {
self.find_mut(key).map(|entry| &mut entry.1)
}
#[inline]
pub fn contains_key<K2: PartialEq<K> + ?Sized>(&self, key: &K2) -> bool {
self.find(key).is_some()
}
#[inline]
pub fn len(&self) -> usize { self.vec.len() }
#[inline]
pub fn iter(&self) -> ::std::slice::Iter<(K, V)> {
self.vec.iter()
}
#[inline]
pub fn remove<K2: PartialEq<K> + ?Sized>(&mut self, key: &K2) -> Option<V> {
self.pos(key).map(|pos| self.vec.remove(pos)).map(|(_, v)| v)
}
#[inline]
pub fn remove_all<K2: PartialEq<K> + ?Sized>(&mut self, key: &K2) {
let len = self.vec.len();
for i in (0..len).rev() {
if key == &self.vec[i].0 {
self.vec.remove(i);
}
}
}
#[inline]
pub fn clear(&mut self) {
self.vec.clear();
}
#[inline]
fn find<K2: PartialEq<K> + ?Sized>(&self, key: &K2) -> Option<&(K, V)> {
for entry in &self.vec {
if key == &entry.0 {
return Some(entry);
}
}
None
}
#[inline]
fn find_mut<K2: PartialEq<K> + ?Sized>(&mut self, key: &K2) -> Option<&mut (K, V)> {
for entry in &mut self.vec {
if key == &entry.0 {
return Some(entry);
}
}
None
}
#[inline]
fn pos<K2: PartialEq<K> + ?Sized>(&self, key: &K2) -> Option<usize> {
self.vec.iter().position(|entry| key == &entry.0)
}
}
pub enum Entry<'a, K: 'a, V: 'a> {
Vacant(VacantEntry<'a, K, V>),
Occupied(OccupiedEntry<'a, K, V>)
}
pub struct VacantEntry<'a, K: 'a, V: 'a> {
vec: &'a mut Vec<(K, V)>,
key: K,
}
impl<'a, K, V> VacantEntry<'a, K, V> {
pub fn insert(self, val: V) -> &'a mut V {
self.vec.push((self.key, val));
let pos = self.vec.len() - 1;
&mut self.vec[pos].1
}
}
pub struct OccupiedEntry<'a, K: 'a, V: 'a> {
vec: &'a mut Vec<(K, V)>,
pos: usize,
}
impl<'a, K, V> OccupiedEntry<'a, K, V> {
pub fn into_mut(self) -> &'a mut V {
&mut self.vec[self.pos].1
}
}