[−][src]Struct oxygengine_core::ecs::shred::MetaTable
The MetaTable
which allows to store object-safe trait implementations for
resources.
For example, you have a trait Foo
that is implemented by several
resources. You can register all the implementors using
MetaTable::register
. Later on, you can iterate over all resources that
implement Foo
without knowing their specific type.
Examples
use shred::{CastFrom, MetaTable, World}; trait Object { fn method1(&self) -> i32; fn method2(&mut self, x: i32); } unsafe impl<T> CastFrom<T> for dyn Object where T: Object + 'static, { fn cast(t: &T) -> &Self { t } fn cast_mut(t: &mut T) -> &mut Self { t } } struct ImplementorA(i32); impl Object for ImplementorA { fn method1(&self) -> i32 { self.0 } fn method2(&mut self, x: i32) { self.0 += x; } } struct ImplementorB(i32); impl Object for ImplementorB { fn method1(&self) -> i32 { self.0 } fn method2(&mut self, x: i32) { self.0 *= x; } } let mut world = World::empty(); world.insert(ImplementorA(3)); world.insert(ImplementorB(1)); let mut table = MetaTable::<dyn Object>::new(); table.register(&ImplementorA(31415)); // Can just be some instance of type `&ImplementorA`. table.register(&ImplementorB(27182)); { let mut iter = table.iter(&mut world); assert_eq!(iter.next().unwrap().method1(), 3); assert_eq!(iter.next().unwrap().method1(), 1); }
Implementations
impl<T> MetaTable<T> where
T: ?Sized,
[src]
T: ?Sized,
pub fn new() -> MetaTable<T>
[src]
Creates a new MetaTable
.
pub fn register<R>(&mut self, r: &R) where
R: Resource,
T: CastFrom<R> + 'static,
[src]
R: Resource,
T: CastFrom<R> + 'static,
Registers a resource R
that implements the trait T
.
This just needs some instance of type R
to retrieve the vtable.
It doesn't have to be the same object you're calling get
with later.
pub fn get(&self, res: &'a (dyn Resource + 'static)) -> Option<&'a T>
[src]
Tries to convert world
to a trait object of type &T
.
If world
doesn't have an implementation for T
(or it wasn't
registered), this will return None
.
pub fn get_mut(&self, res: &'a (dyn Resource + 'static)) -> Option<&'a mut T>
[src]
Tries to convert world
to a trait object of type &mut T
.
If world
doesn't have an implementation for T
(or it wasn't
registered), this will return None
.
pub fn iter(&'a self, res: &'a World) -> MetaIter<'a, T>ⓘ
[src]
Iterates all resources that implement T
and were registered.
pub fn iter_mut(&'a self, res: &'a World) -> MetaIterMut<'a, T>ⓘNotable traits for MetaIterMut<'a, T>
impl<'a, T> Iterator for MetaIterMut<'a, T> where
T: 'a + ?Sized, type Item = &'a mut T;
[src]
Notable traits for MetaIterMut<'a, T>
impl<'a, T> Iterator for MetaIterMut<'a, T> where
T: 'a + ?Sized, type Item = &'a mut T;
Iterates all resources that implement T
and were registered mutably.
Trait Implementations
Auto Trait Implementations
impl<T: ?Sized> RefUnwindSafe for MetaTable<T> where
T: RefUnwindSafe,
T: RefUnwindSafe,
impl<T: ?Sized> Send for MetaTable<T>
impl<T: ?Sized> Sync for MetaTable<T>
impl<T: ?Sized> Unpin for MetaTable<T>
impl<T: ?Sized> UnwindSafe for MetaTable<T> where
T: RefUnwindSafe,
T: RefUnwindSafe,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
[src]
T: 'static + ?Sized,
impl<T> Any for T where
T: Any,
T: Any,
fn get_type_id(&self) -> TypeId
impl<T> Borrow<T> for T where
T: ?Sized,
[src]
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
[src]
T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
[src]
impl<T> Event for T where
T: Send + Sync + 'static,
[src]
T: Send + Sync + 'static,
impl<T> From<T> for T
[src]
impl<T, U> Into<U> for T where
U: From<T>,
[src]
U: From<T>,
impl<T> Resource for T where
T: Any,
[src]
T: Any,
impl<T> TryDefault for T where
T: Default,
[src]
T: Default,
fn try_default() -> Result<T, String>
[src]
fn unwrap_default() -> Self
[src]
impl<T, U> TryFrom<U> for T where
U: Into<T>,
[src]
U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
[src]
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
[src]
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
[src]
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
V: MultiLane<T>,