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impl Reflect for std::collections::HashMap instead of only bevy::utils::HashMap (#7739) (#7782)

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# Objective

Implement `Reflect` for `std::collections::HashMap<K, V, S>` as well as `hashbrown::HashMap<K, V, S>` rather than just for `hashbrown::HashMap<K, V, RandomState>`. Fixes #7739.

## Solution

Rather than implementing on `HashMap<K, V>` I instead implemented most of the related traits on `HashMap<K, V, S> where S: BuildHasher + Send + Sync + 'static` and then `FromReflect` also needs the extra bound `S: Default` because it needs to use `with_capacity_and_hasher` so needs to be able to generate a default hasher.

As the API of `hashbrown::HashMap` is identical to `collections::HashMap` making them both work just required creating an `impl_reflect_for_hashmap` macro like the `impl_reflect_for_veclike` above and then applying this to both HashMaps.

---

## Changelog

`std::collections::HashMap` can now be reflected. Also more `State` generics than just `RandomState` can now be reflected for both `hashbrown::HashMap` and `collections::HashMap`
This commit is contained in:
TheBigCheese 2023-02-27 21:37:36 +00:00
parent aba8e81481
commit 3d3444b981
1 changed files with 208 additions and 180 deletions
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52
crates/bevy_reflect/src/impls/std.rs
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@ -10,14 +10,14 @@ use crate::{
use crate::utility::{reflect_hasher, GenericTypeInfoCell, NonGenericTypeInfoCell};
use bevy_reflect_derive::{impl_from_reflect_value, impl_reflect_value};
use bevy_utils::HashSet;
use bevy_utils::{Duration, Instant};
use bevy_utils::{HashMap, HashSet};
use std::{
any::Any,
borrow::Cow,
collections::VecDeque,
ffi::OsString,
hash::{Hash, Hasher},
hash::{BuildHasher, Hash, Hasher},
num::{
NonZeroI128, NonZeroI16, NonZeroI32, NonZeroI64, NonZeroI8, NonZeroIsize, NonZeroU128,
NonZeroU16, NonZeroU32, NonZeroU64, NonZeroU8, NonZeroUsize,
@ -347,16 +347,23 @@ impl_reflect_for_veclike!(
VecDeque::<T>
);
impl<K: FromReflect + Eq + Hash, V: FromReflect> Map for HashMap<K, V> {
macro_rules! impl_reflect_for_hashmap {
($ty:ty) => {
impl<K, V, S> Map for $ty
where
K: FromReflect + Eq + Hash,
V: FromReflect,
S: BuildHasher + Send + Sync + 'static,
{
fn get(&self, key: &dyn Reflect) -> Option<&dyn Reflect> {
key.downcast_ref::<K>()
.and_then(|key| HashMap::get(self, key))
.and_then(|key| Self::get(self, key))
.map(|value| value as &dyn Reflect)
}
fn get_mut(&mut self, key: &dyn Reflect) -> Option<&mut dyn Reflect> {
key.downcast_ref::<K>()
.and_then(move |key| HashMap::get_mut(self, key))
.and_then(move |key| Self::get_mut(self, key))
.map(|value| value as &mut dyn Reflect)
}
@ -430,7 +437,12 @@ impl<K: FromReflect + Eq + Hash, V: FromReflect> Map for HashMap<K, V> {
}
}
impl<K: FromReflect + Eq + Hash, V: FromReflect> Reflect for HashMap<K, V> {
impl<K, V, S> Reflect for $ty
where
K: FromReflect + Eq + Hash,
V: FromReflect,
S: BuildHasher + Send + Sync + 'static,
{
fn type_name(&self) -> &str {
std::any::type_name::<Self>()
}
@ -494,29 +506,40 @@ impl<K: FromReflect + Eq + Hash, V: FromReflect> Reflect for HashMap<K, V> {
}
}
impl<K: FromReflect + Eq + Hash, V: FromReflect> Typed for HashMap<K, V> {
impl<K, V, S> Typed for $ty
where
K: FromReflect + Eq + Hash,
V: FromReflect,
S: BuildHasher + Send + Sync + 'static,
{
fn type_info() -> &'static TypeInfo {
static CELL: GenericTypeInfoCell = GenericTypeInfoCell::new();
CELL.get_or_insert::<Self, _>(|| TypeInfo::Map(MapInfo::new::<Self, K, V>()))
}
}
impl<K, V> GetTypeRegistration for HashMap<K, V>
impl<K, V, S> GetTypeRegistration for $ty
where
K: FromReflect + Eq + Hash,
V: FromReflect,
S: BuildHasher + Send + Sync + 'static,
{
fn get_type_registration() -> TypeRegistration {
let mut registration = TypeRegistration::of::<HashMap<K, V>>();
registration.insert::<ReflectFromPtr>(FromType::<HashMap<K, V>>::from_type());
let mut registration = TypeRegistration::of::<Self>();
registration.insert::<ReflectFromPtr>(FromType::<Self>::from_type());
registration
}
}
impl<K: FromReflect + Eq + Hash, V: FromReflect> FromReflect for HashMap<K, V> {
impl<K, V, S> FromReflect for $ty
where
K: FromReflect + Eq + Hash,
V: FromReflect,
S: BuildHasher + Default + Send + Sync + 'static,
{
fn from_reflect(reflect: &dyn Reflect) -> Option<Self> {
if let ReflectRef::Map(ref_map) = reflect.reflect_ref() {
let mut new_map = Self::with_capacity(ref_map.len());
let mut new_map = Self::with_capacity_and_hasher(ref_map.len(), S::default());
for (key, value) in ref_map.iter() {
let new_key = K::from_reflect(key)?;
let new_value = V::from_reflect(value)?;
@ -528,6 +551,11 @@ impl<K: FromReflect + Eq + Hash, V: FromReflect> FromReflect for HashMap<K, V> {
}
}
}
};
}
impl_reflect_for_hashmap!(bevy_utils::hashbrown::HashMap<K, V, S>);
impl_reflect_for_hashmap!(std::collections::HashMap<K, V, S>);
impl<T: Reflect, const N: usize> Array for [T; N] {
#[inline]