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//! Poor-rust-man's downcasts to have `AnyMap`
use alloc::boxed::Box;
use core::{
any::{Any, TypeId},
ptr::addr_of,
};
/// Convert to an Any trait object
pub trait AsAny: Any {
/// Returns this as Any trait
fn as_any(&self) -> &dyn Any;
/// Returns this as mutable Any trait
fn as_any_mut(&mut self) -> &mut dyn Any;
/// Returns this as boxed Any trait
fn as_any_boxed(self: Box<Self>) -> Box<dyn Any>;
}
/// Implement `AsAny` for a type
#[macro_export]
macro_rules! impl_asany {
($struct_name:ident $(< $( $lt:tt $( : $clt:tt $(+ $dlt:tt )* )? ),+ >)?) => {
impl $(< $( $lt $( : $clt $(+ $dlt )* )? ),+ >)? $crate::bolts::anymap::AsAny for $struct_name $(< $( $lt ),+ >)? {
fn as_any(&self) -> &dyn ::core::any::Any {
self
}
fn as_any_mut(&mut self) -> &mut dyn ::core::any::Any {
self
}
fn as_any_boxed(
self: ::alloc::boxed::Box<Self>,
) -> ::alloc::boxed::Box<dyn ::core::any::Any> {
self
}
}
};
}
/// Get a `type_id` from its previously unpacked `u64`.
/// Opposite of [`unpack_type_id(id)`].
///
/// # Safety
/// Probably not safe for future compilers, fine for now.
#[must_use]
pub fn pack_type_id(id: u64) -> TypeId {
assert_eq_size!(TypeId, u64);
unsafe { *(addr_of!(id) as *const TypeId) }
}
/// Unpack a `type_id` to an `u64`
/// Opposite of [`pack_type_id(id)`].
///
/// # Safety
/// Probably not safe for future compilers, fine for now.
#[must_use]
pub fn unpack_type_id(id: TypeId) -> u64 {
assert_eq_size!(TypeId, u64);
unsafe { *(addr_of!(id) as *const u64) }
}
/// Create `AnyMap` and `NamedAnyMap` for a given trait
#[macro_export]
macro_rules! create_anymap_for_trait {
( $mod_name:ident, $parent_mod:path, $trait_name:ident $(< $( $lt:tt $( : $clt:tt $(+ $dlt:tt )* )? ),+ >)? $(, $attrs:meta)*) => {
mod $mod_name {
use alloc::boxed::Box;
use core::any::TypeId;
use hashbrown::hash_map::{Keys, Values, ValuesMut};
use hashbrown::HashMap;
use $crate::bolts::anymap::{pack_type_id, unpack_type_id};
use $crate::Error;
use super::*;
#[allow(unused_import_braces)]
use $parent_mod::{$trait_name};
/// An anymap containing trait objects
#[derive(Default)]
$(#[$attrs])*
pub struct AnyMap $(< $( $lt $( : $clt $(+ $dlt )* )? ),+ >)? {
map: HashMap<u64, Box<dyn $trait_name $(< $( $lt ),+ >)?>>,
}
#[allow(unused_qualifications)]
impl $(< $( $lt $( : $clt $(+ $dlt )* )? ),+ >)? AnyMap $(< $( $lt ),+ >)? {
/// Get an element from the map.
#[must_use]
#[inline]
pub fn get<T>(&self) -> Option<&T>
where
T: $trait_name $(< $( $lt ),+ >)?,
{
self.map
.get(&unpack_type_id(TypeId::of::<T>()))
.map(|x| x.as_ref().as_any().downcast_ref::<T>().unwrap())
}
/// Get a mutable borrow for an element in the map.
#[must_use]
#[inline]
pub fn get_mut<T>(&mut self) -> Option<&mut T>
where
T: $trait_name $(< $( $lt ),+ >)?,
{
self.map
.get_mut(&unpack_type_id(TypeId::of::<T>()))
.map(|x| x.as_mut().as_any_mut().downcast_mut::<T>().unwrap())
}
/// Remove an element in the map. Returns the removed element.
#[must_use]
#[inline]
pub fn remove<T>(&mut self) -> Option<Box<T>>
where
T: $trait_name $(< $( $lt ),+ >)?,
{
self.map
.remove(&unpack_type_id(TypeId::of::<T>()))
.map(|x| x.as_any_boxed().downcast::<T>().unwrap())
}
/// Insert an element into the map.
#[inline]
pub fn insert<T>(&mut self, t: T)
where
T: $trait_name $(< $( $lt ),+ >)?,
{
self.map
.insert(unpack_type_id(TypeId::of::<T>()), Box::new(t));
}
/// Insert a boxed element into the map.
#[inline]
pub fn insert_boxed<T>(&mut self, t: Box<T>)
where
T: $trait_name $(< $( $lt ),+ >)?,
{
self.map.insert(unpack_type_id(TypeId::of::<T>()), t);
}
/// Returns the count of elements in this map.
#[must_use]
#[inline]
pub fn len(&self) -> usize {
self.map.len()
}
/// Returns `true` if this map is empty.
#[must_use]
pub fn is_empty(&self) -> bool {
self.map.is_empty()
}
/// Returns if the map contains the given type.
#[must_use]
#[inline]
pub fn contains<T>(&self) -> bool
where
T: $trait_name $(< $( $lt ),+ >)?,
{
self.map.contains_key(&unpack_type_id(TypeId::of::<T>()))
}
/// Create a new [`AnyMap`].
#[must_use]
pub fn new() -> Self {
AnyMap {
map: HashMap::default(),
}
}
}
/// An anymap, addressable by name and type, containing trait objects
#[allow(unused_qualifications)]
#[derive(Default)]
$(#[$attrs])*
pub struct NamedAnyMap $(< $( $lt $( : $clt $(+ $dlt )* )? ),+ >)? {
map: HashMap<u64, HashMap<u64, Box<dyn $trait_name $(< $( $lt ),+ >)?>>>,
}
#[allow(unused_qualifications)]
impl $(< $( $lt $( : $clt $(+ $dlt )* )? ),+ >)? NamedAnyMap $(< $( $lt ),+ >)? {
/// Get an element by name
#[must_use]
#[inline]
pub fn get<T>(&self, name: &str) -> Option<&T>
where
T: $trait_name $(< $( $lt ),+ >)?,
{
match self.map.get(&unpack_type_id(TypeId::of::<T>())) {
None => None,
Some(h) => h
.get(&xxhash_rust::xxh3::xxh3_64(name.as_bytes()))
.map(|x| x.as_any().downcast_ref::<T>().unwrap()),
}
}
/// Get an element of a given type contained in this map by [`TypeId`].
#[must_use]
#[allow(unused_qualifications)]
#[inline]
pub fn by_typeid(&self, name: &str, typeid: &TypeId) -> Option<&dyn $trait_name $(< $( $lt ),+ >)?> {
match self.map.get(&unpack_type_id(*typeid)) {
None => None,
Some(h) => h
.get(&xxhash_rust::xxh3::xxh3_64(name.as_bytes()))
.map(AsRef::as_ref),
}
}
/// Get an element of a given type contained in this map by [`TypeId`], as mut.
#[must_use]
#[inline]
pub fn get_mut<T>(&mut self, name: &str) -> Option<&mut T>
where
T: $trait_name $(< $( $lt ),+ >)?,
{
match self.map.get_mut(&unpack_type_id(TypeId::of::<T>())) {
None => None,
Some(h) => h
.get_mut(&xxhash_rust::xxh3::xxh3_64(name.as_bytes()))
.map(|x| x.as_any_mut().downcast_mut::<T>().unwrap()),
}
}
/// Get an element of a given type contained in this map by [`TypeId`], as mut.
#[must_use]
#[inline]
pub fn by_typeid_mut(
&mut self,
name: &str,
typeid: &TypeId,
) -> Option<&mut dyn $trait_name $(< $( $lt ),+ >)?> {
match self.map.get_mut(&unpack_type_id(*typeid)) {
None => None,
Some(h) => h
.get_mut(&xxhash_rust::xxh3::xxh3_64(name.as_bytes()))
.map(AsMut::as_mut),
}
}
/// Get all elements of a type contained in this map.
#[must_use]
#[allow(unused_qualifications)]
#[inline]
pub fn get_all<T>(
&self,
) -> Option<
core::iter::Map<
Values<'_, u64, Box<dyn $trait_name $(< $( $lt ),+ >)?>>,
fn(&Box<dyn $trait_name $(< $( $lt ),+ >)?>) -> &T,
>,
>
where
T: $trait_name $(< $( $lt ),+ >)?,
{
#[allow(clippy::manual_map)]
match self.map.get(&unpack_type_id(TypeId::of::<T>())) {
None => None,
Some(h) => {
Some(h.values().map(|x| x.as_any().downcast_ref::<T>().unwrap()))
}
}
}
/// Get all elements of a given type contained in this map by [`TypeId`].
#[must_use]
#[allow(unused_qualifications)]
#[inline]
pub fn all_by_typeid(
&self,
typeid: &TypeId,
) -> Option<
core::iter::Map<
Values<'_, u64, Box<dyn $trait_name $(< $( $lt ),+ >)?>>,
fn(&Box<dyn $trait_name $(< $( $lt ),+ >)?>) -> &dyn $trait_name $(< $( $lt ),+ >)?,
>,
> {
#[allow(clippy::manual_map)]
match self.map.get(&unpack_type_id(*typeid)) {
None => None,
Some(h) => Some(h.values().map(|x| x.as_ref())),
}
}
/// Get all elements contained in this map, as mut.
#[inline]
#[allow(unused_qualifications)]
pub fn get_all_mut<T>(
&mut self,
) -> Option<
core::iter::Map<
ValuesMut<'_, u64, Box<dyn $trait_name $(< $( $lt ),+ >)?>>,
fn(&mut Box<dyn $trait_name $(< $( $lt ),+ >)?>) -> &mut T,
>,
>
where
T: $trait_name $(< $( $lt ),+ >)?,
{
#[allow(clippy::manual_map)]
match self.map.get_mut(&unpack_type_id(TypeId::of::<T>())) {
None => None,
Some(h) => Some(
h.values_mut()
.map(|x| x.as_any_mut().downcast_mut::<T>().unwrap()),
),
}
}
/// Get all [`TypeId`]`s` contained in this map, as mut.
#[inline]
#[allow(unused_qualifications)]
pub fn all_by_typeid_mut(
&mut self,
typeid: &TypeId,
) -> Option<
core::iter::Map<
ValuesMut<'_, u64, Box<dyn $trait_name $(< $( $lt ),+ >)?>>,
fn(&mut Box<dyn $trait_name $(< $( $lt ),+ >)?>) -> &mut dyn $trait_name $(< $( $lt ),+ >)?,
>,
> {
#[allow(clippy::manual_map)]
match self.map.get_mut(&unpack_type_id(*typeid)) {
None => None,
Some(h) => Some(h.values_mut().map(|x| x.as_mut())),
}
}
/// Get all [`TypeId`]`s` contained in this map.
#[inline]
#[allow(unused_qualifications)]
pub fn all_typeids(
&self,
) -> core::iter::Map<
Keys<'_, u64, HashMap<u64, Box<dyn $trait_name $(< $( $lt ),+ >)?>>>,
fn(&u64) -> TypeId,
> {
self.map.keys().map(|x| pack_type_id(*x))
}
/// Run `func` for each element in this map.
#[inline]
#[allow(unused_qualifications)]
pub fn for_each<F: FnMut(&TypeId, &Box<dyn $trait_name $(< $( $lt ),+ >)?>) -> Result<(), Error>>(
&self,
func: &mut F,
) -> Result<(), Error> {
for (id, h) in self.map.iter() {
for x in h.values() {
func(&pack_type_id(*id), x)?;
}
}
Ok(())
}
/// Run `func` for each element in this map, getting a mutable borrow.
#[inline]
pub fn for_each_mut<F: FnMut(&TypeId, &mut Box<dyn $trait_name $(< $( $lt ),+ >)?>) -> Result<(), Error>>(
&mut self,
func: &mut F,
) -> Result<(), Error> {
for (id, h) in self.map.iter_mut() {
for x in h.values_mut() {
func(&pack_type_id(*id), x)?;
}
}
Ok(())
}
/// Insert an element into this map.
#[inline]
#[allow(unused_qualifications)]
pub fn insert(&mut self, val: Box<dyn $trait_name $(< $( $lt ),+ >)?>, name: &str) {
let id = unpack_type_id((*val).type_id());
if !self.map.contains_key(&id) {
self.map.insert(id, HashMap::default());
}
self.map
.get_mut(&id)
.unwrap()
.insert(xxhash_rust::xxh3::xxh3_64(name.as_bytes()), val);
}
/// Returns the `len` of this map.
#[must_use]
#[inline]
pub fn len(&self) -> usize {
self.map.len()
}
/// Returns `true` if this map is empty.
#[must_use]
pub fn is_empty(&self) -> bool {
self.map.is_empty()
}
/// Returns if the element with a given type is contained in this map.
#[must_use]
#[inline]
pub fn contains_type<T>(&self) -> bool
where
T: $trait_name $(< $( $lt ),+ >)?,
{
self.map.contains_key(&unpack_type_id(TypeId::of::<T>()))
}
/// Returns if the element by a given `name` is contained in this map.
#[must_use]
#[inline]
pub fn contains<T>(&self, name: &str) -> bool
where
T: $trait_name $(< $( $lt ),+ >)?,
{
match self.map.get(&unpack_type_id(TypeId::of::<T>())) {
None => false,
Some(h) => h.contains_key(&xxhash_rust::xxh3::xxh3_64(name.as_bytes())),
}
}
/// Create a new `SerdeAny` map.
#[must_use]
pub fn new() -> Self {
Self {
map: HashMap::default(),
}
}
}
}
}
}