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use std::any::{Any, TypeId};
use std::fmt;
use fxhash::FxHashMap;
#[derive(Default)]
pub struct Extensions {
map: FxHashMap<TypeId, Box<dyn Any>>,
}
impl Extensions {
#[inline]
pub fn new() -> Extensions {
Extensions {
map: FxHashMap::default(),
}
}
pub fn insert<T: 'static>(&mut self, val: T) {
self.map.insert(TypeId::of::<T>(), Box::new(val));
}
pub fn contains<T: 'static>(&self) -> bool {
self.map.contains_key(&TypeId::of::<T>())
}
pub fn get<T: 'static>(&self) -> Option<&T> {
self.map
.get(&TypeId::of::<T>())
.and_then(|boxed| boxed.downcast_ref())
}
pub fn get_mut<T: 'static>(&mut self) -> Option<&mut T> {
self.map
.get_mut(&TypeId::of::<T>())
.and_then(|boxed| boxed.downcast_mut())
}
pub fn remove<T: 'static>(&mut self) -> Option<T> {
self.map
.remove(&TypeId::of::<T>())
.and_then(|boxed| boxed.downcast().ok().map(|boxed| *boxed))
}
#[inline]
pub fn clear(&mut self) {
self.map.clear();
}
}
impl fmt::Debug for Extensions {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Extensions").finish()
}
}
#[test]
fn test_remove() {
let mut map = Extensions::new();
map.insert::<i8>(123);
assert!(map.get::<i8>().is_some());
map.remove::<i8>();
assert!(map.get::<i8>().is_none());
}
#[test]
fn test_clear() {
let mut map = Extensions::new();
map.insert::<i8>(8);
map.insert::<i16>(16);
map.insert::<i32>(32);
assert!(map.contains::<i8>());
assert!(map.contains::<i16>());
assert!(map.contains::<i32>());
map.clear();
assert!(!map.contains::<i8>());
assert!(!map.contains::<i16>());
assert!(!map.contains::<i32>());
map.insert::<i8>(10);
assert_eq!(*map.get::<i8>().unwrap(), 10);
}
#[test]
fn test_integers() {
let mut map = Extensions::new();
map.insert::<i8>(8);
map.insert::<i16>(16);
map.insert::<i32>(32);
map.insert::<i64>(64);
map.insert::<i128>(128);
map.insert::<u8>(8);
map.insert::<u16>(16);
map.insert::<u32>(32);
map.insert::<u64>(64);
map.insert::<u128>(128);
assert!(map.get::<i8>().is_some());
assert!(map.get::<i16>().is_some());
assert!(map.get::<i32>().is_some());
assert!(map.get::<i64>().is_some());
assert!(map.get::<i128>().is_some());
assert!(map.get::<u8>().is_some());
assert!(map.get::<u16>().is_some());
assert!(map.get::<u32>().is_some());
assert!(map.get::<u64>().is_some());
assert!(map.get::<u128>().is_some());
}
#[test]
fn test_composition() {
struct Magi<T>(pub T);
struct Madoka {
pub god: bool,
}
struct Homura {
pub attempts: usize,
}
struct Mami {
pub guns: usize,
}
let mut map = Extensions::new();
map.insert(Magi(Madoka { god: false }));
map.insert(Magi(Homura { attempts: 0 }));
map.insert(Magi(Mami { guns: 999 }));
assert!(!map.get::<Magi<Madoka>>().unwrap().0.god);
assert_eq!(0, map.get::<Magi<Homura>>().unwrap().0.attempts);
assert_eq!(999, map.get::<Magi<Mami>>().unwrap().0.guns);
}
#[test]
fn test_extensions() {
#[derive(Debug, PartialEq)]
struct MyType(i32);
let mut extensions = Extensions::new();
extensions.insert(5i32);
extensions.insert(MyType(10));
assert_eq!(extensions.get(), Some(&5i32));
assert_eq!(extensions.get_mut(), Some(&mut 5i32));
assert_eq!(extensions.remove::<i32>(), Some(5i32));
assert!(extensions.get::<i32>().is_none());
assert_eq!(extensions.get::<bool>(), None);
assert_eq!(extensions.get(), Some(&MyType(10)));
}