+ /// Reserves capacity for at least `additional` more elements to be inserted
+ /// in the collection. The collection may reserve more space to avoid
+ /// frequent reallocations.
+ ///
+ /// # Panics
+ ///
+ /// Panics if the new allocation size overflows `usize`.
+ #[inline]
+ pub fn reserve(&mut self, additional: usize) {
+ self.raw.reserve(additional)
+ }
+
+ /// Shrinks the capacity of the collection as much as possible. It will drop
+ /// down as much as possible while maintaining the internal rules
+ /// and possibly leaving some space in accordance with the resize policy.
+ #[inline]
+ pub fn shrink_to_fit(&mut self) {
+ self.raw.shrink_to_fit()
+ }
+
+ // Additional stable methods (as of 1.60.0-nightly) that could be added:
+ // try_reserve(&mut self, additional: usize) -> Result<(), TryReserveError> (1.57.0)
+ // shrink_to(&mut self, min_capacity: usize) (1.56.0)
+
+ /// Returns the number of items in the collection.
+ #[inline]
+ pub fn len(&self) -> usize {
+ self.raw.len()
+ }
+
+ /// Returns true if there are no items in the collection.
+ #[inline]
+ pub fn is_empty(&self) -> bool {
+ self.raw.is_empty()
+ }
+
+ /// Removes all items from the collection. Keeps the allocated memory for reuse.
+ #[inline]
+ pub fn clear(&mut self) {
+ self.raw.clear()
+ }
+
+ /// Returns a reference to the value stored in the collection for the type `T`,
+ /// if it exists.
+ #[inline]
+ pub fn get<T: IntoBox<A>>(&self) -> Option<&T> {
+ self.raw.get(&TypeId::of::<T>())
+ .map(|any| unsafe { any.downcast_ref_unchecked::<T>() })
+ }
+
+ /// Returns a mutable reference to the value stored in the collection for the type `T`,
+ /// if it exists.
+ #[inline]
+ pub fn get_mut<T: IntoBox<A>>(&mut self) -> Option<&mut T> {
+ self.raw.get_mut(&TypeId::of::<T>())
+ .map(|any| unsafe { any.downcast_mut_unchecked::<T>() })
+ }
+
+ /// Sets the value stored in the collection for the type `T`.
+ /// If the collection already had a value of type `T`, that value is returned.
+ /// Otherwise, `None` is returned.
+ #[inline]
+ pub fn insert<T: IntoBox<A>>(&mut self, value: T) -> Option<T> {
+ self.raw.insert(TypeId::of::<T>(), value.into_box())
+ .map(|any| unsafe { *any.downcast_unchecked::<T>() })
+ }
+
+ // rustc 1.60.0-nightly has another method try_insert that would be nice when stable.
+
+ /// Removes the `T` value from the collection,
+ /// returning it if there was one or `None` if there was not.
+ #[inline]
+ pub fn remove<T: IntoBox<A>>(&mut self) -> Option<T> {
+ self.raw.remove(&TypeId::of::<T>())
+ .map(|any| *unsafe { any.downcast_unchecked::<T>() })
+ }
+
+ /// Returns true if the collection contains a value of type `T`.
+ #[inline]
+ pub fn contains<T: IntoBox<A>>(&self) -> bool {
+ self.raw.contains_key(&TypeId::of::<T>())
+ }
+
+ /// Gets the entry for the given type in the collection for in-place manipulation
+ #[inline]
+ pub fn entry<T: IntoBox<A>>(&mut self) -> Entry<A, T> {
+ match self.raw.entry(TypeId::of::<T>()) {
+ hash_map::Entry::Occupied(e) => Entry::Occupied(OccupiedEntry {
+ inner: e,
+ type_: PhantomData,
+ }),
+ hash_map::Entry::Vacant(e) => Entry::Vacant(VacantEntry {
+ inner: e,
+ type_: PhantomData,
+ }),
+ }
+ }
+
+ /// Get access to the raw hash map that backs this.
+ ///
+ /// This will seldom be useful, but it’s conceivable that you could wish to iterate
+ /// over all the items in the collection, and this lets you do that.
+ #[inline]
+ pub fn as_raw(&self) -> &RawMap<A> {
+ &self.raw
+ }
+
+ /// Get mutable access to the raw hash map that backs this.
+ ///
+ /// This will seldom be useful, but it’s conceivable that you could wish to iterate
+ /// over all the items in the collection mutably, or drain or something, or *possibly*
+ /// even batch insert, and this lets you do that.
+ ///
+ /// # Safety
+ ///
+ /// If you insert any values to the raw map, the key (a `TypeId`) must match the
+ /// value’s type, or *undefined behaviour* will occur when you access those values.
+ ///
+ /// (*Removing* entries is perfectly safe.)
+ #[inline]
+ pub unsafe fn as_raw_mut(&mut self) -> &mut RawMap<A> {
+ &mut self.raw
+ }
+
+ /// Convert this into the raw hash map that backs this.
+ ///
+ /// This will seldom be useful, but it’s conceivable that you could wish to consume all
+ /// the items in the collection and do *something* with some or all of them, and this
+ /// lets you do that, without the `unsafe` that `.as_raw_mut().drain()` would require.
+ #[inline]
+ pub fn into_raw(self) -> RawMap<A> {
+ self.raw
+ }
+
+ /// Construct a map from a collection of raw values.
+ ///
+ /// You know what? I can’t immediately think of any legitimate use for this, especially
+ /// because of the requirement of the `BuildHasherDefault<TypeIdHasher>` generic in the
+ /// map.
+ ///
+ /// Perhaps this will be most practical as `unsafe { Map::from_raw(iter.collect()) }`,
+ /// `iter` being an iterator over `(TypeId, Box<A>)` pairs. Eh, this method provides
+ /// symmetry with `into_raw`, so I don’t care if literally no one ever uses it. I’m not
+ /// even going to write a test for it, it’s so trivial.
+ ///
+ /// # Safety
+ ///
+ /// For all entries in the raw map, the key (a `TypeId`) must match the value’s type,
+ /// or *undefined behaviour* will occur when you access that entry.
+ #[inline]
+ pub unsafe fn from_raw(raw: RawMap<A>) -> Map<A> {
+ Self { raw }
+ }
+ }
+
+ impl<A: ?Sized + Downcast> Extend<Box<A>> for Map<A> {
+ #[inline]
+ fn extend<T: IntoIterator<Item = Box<A>>>(&mut self, iter: T) {
+ for item in iter {
+ let _ = self.raw.insert(Downcast::type_id(&*item), item);
+ }
+ }
+ }
+
+ /// A view into a single occupied location in an `Map`.
+ pub struct OccupiedEntry<'a, A: ?Sized + Downcast, V: 'a> {
+ inner: hash_map::OccupiedEntry<'a, TypeId, Box<A>, $($entry_generics)?>,
+ type_: PhantomData<V>,
+ }
+
+ /// A view into a single empty location in an `Map`.
+ pub struct VacantEntry<'a, A: ?Sized + Downcast, V: 'a> {
+ inner: hash_map::VacantEntry<'a, TypeId, Box<A>, $($entry_generics)?>,
+ type_: PhantomData<V>,
+ }
+
+ /// A view into a single location in an `Map`, which may be vacant or occupied.
+ pub enum Entry<'a, A: ?Sized + Downcast, V: 'a> {
+ /// An occupied Entry
+ Occupied(OccupiedEntry<'a, A, V>),
+ /// A vacant Entry
+ Vacant(VacantEntry<'a, A, V>),
+ }
+
+ impl<'a, A: ?Sized + Downcast, V: IntoBox<A>> Entry<'a, A, V> {
+ /// Ensures a value is in the entry by inserting the default if empty, and returns
+ /// a mutable reference to the value in the entry.
+ #[inline]
+ pub fn or_insert(self, default: V) -> &'a mut V {
+ match self {
+ Entry::Occupied(inner) => inner.into_mut(),
+ Entry::Vacant(inner) => inner.insert(default),
+ }
+ }
+
+ /// Ensures a value is in the entry by inserting the result of the default function if
+ /// empty, and returns a mutable reference to the value in the entry.
+ #[inline]
+ pub fn or_insert_with<F: FnOnce() -> V>(self, default: F) -> &'a mut V {
+ match self {
+ Entry::Occupied(inner) => inner.into_mut(),
+ Entry::Vacant(inner) => inner.insert(default()),
+ }
+ }
+
+ /// Ensures a value is in the entry by inserting the default value if empty,
+ /// and returns a mutable reference to the value in the entry.
+ #[inline]
+ pub fn or_default(self) -> &'a mut V where V: Default {
+ match self {
+ Entry::Occupied(inner) => inner.into_mut(),
+ Entry::Vacant(inner) => inner.insert(Default::default()),
+ }
+ }
+
+ /// Provides in-place mutable access to an occupied entry before any potential inserts
+ /// into the map.
+ #[inline]
+ pub fn and_modify<F: FnOnce(&mut V)>(self, f: F) -> Self {
+ match self {
+ Entry::Occupied(mut inner) => {
+ f(inner.get_mut());
+ Entry::Occupied(inner)
+ },
+ Entry::Vacant(inner) => Entry::Vacant(inner),
+ }
+ }
+
+ // Additional stable methods (as of 1.60.0-nightly) that could be added:
+ // insert_entry(self, value: V) -> OccupiedEntry<'a, K, V> (1.59.0)
+ }
+
+ impl<'a, A: ?Sized + Downcast, V: IntoBox<A>> OccupiedEntry<'a, A, V> {
+ /// Gets a reference to the value in the entry
+ #[inline]
+ pub fn get(&self) -> &V {
+ unsafe { self.inner.get().downcast_ref_unchecked() }
+ }
+
+ /// Gets a mutable reference to the value in the entry
+ #[inline]
+ pub fn get_mut(&mut self) -> &mut V {
+ unsafe { self.inner.get_mut().downcast_mut_unchecked() }
+ }
+
+ /// Converts the OccupiedEntry into a mutable reference to the value in the entry
+ /// with a lifetime bound to the collection itself
+ #[inline]
+ pub fn into_mut(self) -> &'a mut V {
+ unsafe { self.inner.into_mut().downcast_mut_unchecked() }
+ }
+
+ /// Sets the value of the entry, and returns the entry's old value
+ #[inline]
+ pub fn insert(&mut self, value: V) -> V {
+ unsafe { *self.inner.insert(value.into_box()).downcast_unchecked() }
+ }
+
+ /// Takes the value out of the entry, and returns it
+ #[inline]
+ pub fn remove(self) -> V {
+ unsafe { *self.inner.remove().downcast_unchecked() }
+ }
+ }
+
+ impl<'a, A: ?Sized + Downcast, V: IntoBox<A>> VacantEntry<'a, A, V> {
+ /// Sets the value of the entry with the VacantEntry's key,
+ /// and returns a mutable reference to it
+ #[inline]
+ pub fn insert(self, value: V) -> &'a mut V {
+ unsafe { self.inner.insert(value.into_box()).downcast_mut_unchecked() }
+ }
+ }
+
+ #[cfg(test)]
+ mod tests {
+ use crate::CloneAny;
+ use super::*;
+
+ #[derive(Clone, Debug, PartialEq)] struct A(i32);
+ #[derive(Clone, Debug, PartialEq)] struct B(i32);
+ #[derive(Clone, Debug, PartialEq)] struct C(i32);
+ #[derive(Clone, Debug, PartialEq)] struct D(i32);
+ #[derive(Clone, Debug, PartialEq)] struct E(i32);
+ #[derive(Clone, Debug, PartialEq)] struct F(i32);
+ #[derive(Clone, Debug, PartialEq)] struct J(i32);
+
+ macro_rules! test_entry {
+ ($name:ident, $init:ty) => {
+ #[test]
+ fn $name() {
+ let mut map = <$init>::new();
+ assert_eq!(map.insert(A(10)), None);
+ assert_eq!(map.insert(B(20)), None);
+ assert_eq!(map.insert(C(30)), None);
+ assert_eq!(map.insert(D(40)), None);
+ assert_eq!(map.insert(E(50)), None);
+ assert_eq!(map.insert(F(60)), None);
+
+ // Existing key (insert)
+ match map.entry::<A>() {
+ Entry::Vacant(_) => unreachable!(),
+ Entry::Occupied(mut view) => {
+ assert_eq!(view.get(), &A(10));
+ assert_eq!(view.insert(A(100)), A(10));
+ }
+ }
+ assert_eq!(map.get::<A>().unwrap(), &A(100));
+ assert_eq!(map.len(), 6);
+
+
+ // Existing key (update)
+ match map.entry::<B>() {
+ Entry::Vacant(_) => unreachable!(),
+ Entry::Occupied(mut view) => {
+ let v = view.get_mut();
+ let new_v = B(v.0 * 10);
+ *v = new_v;
+ }
+ }
+ assert_eq!(map.get::<B>().unwrap(), &B(200));
+ assert_eq!(map.len(), 6);
+
+
+ // Existing key (remove)
+ match map.entry::<C>() {
+ Entry::Vacant(_) => unreachable!(),
+ Entry::Occupied(view) => {
+ assert_eq!(view.remove(), C(30));
+ }
+ }
+ assert_eq!(map.get::<C>(), None);
+ assert_eq!(map.len(), 5);
+
+
+ // Inexistent key (insert)
+ match map.entry::<J>() {
+ Entry::Occupied(_) => unreachable!(),
+ Entry::Vacant(view) => {
+ assert_eq!(*view.insert(J(1000)), J(1000));
+ }
+ }
+ assert_eq!(map.get::<J>().unwrap(), &J(1000));
+ assert_eq!(map.len(), 6);
+
+ // Entry.or_insert on existing key
+ map.entry::<B>().or_insert(B(71)).0 += 1;
+ assert_eq!(map.get::<B>().unwrap(), &B(201));
+ assert_eq!(map.len(), 6);
+
+ // Entry.or_insert on nonexisting key
+ map.entry::<C>().or_insert(C(300)).0 += 1;
+ assert_eq!(map.get::<C>().unwrap(), &C(301));
+ assert_eq!(map.len(), 7);
+ }
+ }
+ }
+
+ test_entry!(test_entry_any, AnyMap);
+ test_entry!(test_entry_cloneany, Map<dyn CloneAny>);
+
+ #[test]
+ fn test_default() {
+ let map: AnyMap = Default::default();
+ assert_eq!(map.len(), 0);
+ }
+
+ #[test]
+ fn test_clone() {
+ let mut map: Map<dyn CloneAny> = Map::new();
+ let _ = map.insert(A(1));
+ let _ = map.insert(B(2));
+ let _ = map.insert(D(3));
+ let _ = map.insert(E(4));
+ let _ = map.insert(F(5));
+ let _ = map.insert(J(6));
+ let map2 = map.clone();
+ assert_eq!(map2.len(), 6);
+ assert_eq!(map2.get::<A>(), Some(&A(1)));
+ assert_eq!(map2.get::<B>(), Some(&B(2)));
+ assert_eq!(map2.get::<C>(), None);
+ assert_eq!(map2.get::<D>(), Some(&D(3)));
+ assert_eq!(map2.get::<E>(), Some(&E(4)));
+ assert_eq!(map2.get::<F>(), Some(&F(5)));
+ assert_eq!(map2.get::<J>(), Some(&J(6)));
+ }
+
+ #[test]
+ fn test_varieties() {
+ fn assert_send<T: Send>() { }
+ fn assert_sync<T: Sync>() { }
+ fn assert_clone<T: Clone>() { }
+ fn assert_debug<T: ::core::fmt::Debug>() { }
+ assert_send::<Map<dyn Any + Send>>();
+ assert_send::<Map<dyn Any + Send + Sync>>();
+ assert_sync::<Map<dyn Any + Send + Sync>>();
+ assert_debug::<Map<dyn Any>>();
+ assert_debug::<Map<dyn Any + Send>>();
+ assert_debug::<Map<dyn Any + Send + Sync>>();
+ assert_send::<Map<dyn CloneAny + Send>>();
+ assert_send::<Map<dyn CloneAny + Send + Sync>>();
+ assert_sync::<Map<dyn CloneAny + Send + Sync>>();
+ assert_clone::<Map<dyn CloneAny + Send>>();
+ assert_clone::<Map<dyn CloneAny + Send + Sync>>();
+ assert_clone::<Map<dyn CloneAny + Send + Sync>>();
+ assert_debug::<Map<dyn CloneAny>>();
+ assert_debug::<Map<dyn CloneAny + Send>>();
+ assert_debug::<Map<dyn CloneAny + Send + Sync>>();
+ }
+
+ #[test]
+ fn test_extend() {
+ let mut map = AnyMap::new();
+ // (vec![] for 1.36.0 compatibility; more recently, you should use [] instead.)
+ #[cfg(not(feature = "std"))]
+ use alloc::vec;
+ map.extend(vec![Box::new(123) as Box<dyn Any>, Box::new(456), Box::new(true)]);
+ assert_eq!(map.get(), Some(&456));
+ assert_eq!(map.get::<bool>(), Some(&true));
+ assert!(map.get::<Box<dyn Any>>().is_none());
+ }
+ }
+ };