diff options
Diffstat (limited to 'ecs/src/component/single.rs')
-rw-r--r-- | ecs/src/component/single.rs | 98 |
1 files changed, 0 insertions, 98 deletions
diff --git a/ecs/src/component/single.rs b/ecs/src/component/single.rs deleted file mode 100644 index a63dbe3..0000000 --- a/ecs/src/component/single.rs +++ /dev/null @@ -1,98 +0,0 @@ -use std::any::{type_name, Any, TypeId}; -use std::ops::{Deref, DerefMut}; - -use crate::component::Component; -use crate::system::{ComponentRefMut, NoInitParamFlag, Param as SystemParam, System}; -use crate::tuple::FilterExclude as TupleFilterExclude; -use crate::WorldData; - -/// Holds a component which has a single instance and is shared globally. -#[derive(Debug)] -pub struct Single<'world, SingleComponent: Component> -{ - single_component: ComponentRefMut<'world, SingleComponent>, -} - -unsafe impl<'world, SingleComponent> SystemParam<'world> - for Single<'world, SingleComponent> -where - SingleComponent: Component, -{ - type Flags = NoInitParamFlag; - type Input = TupleFilterExclude; - - fn initialize<SystemImpl>( - _system: &mut impl System<'world, SystemImpl>, - _input: Self::Input, - ) - { - } - - fn new<SystemImpl>( - _system: &'world impl System<'world, SystemImpl>, - world_data: &'world WorldData, - ) -> Self - { - let single_component = world_data - .single_component_storage - .get::<SingleComponent>() - .expect("Single component was not found in world") - .write_nonblock() - .unwrap_or_else(|_| { - panic!( - "Failed to aquire read-write lock to single component {}", - type_name::<SingleComponent>() - ) - }); - - Self { - single_component: ComponentRefMut::new(single_component), - } - } - - fn is_compatible<Other: SystemParam<'world>>() -> bool - { - let other_comparable = Other::get_comparable(); - - let Some(comparable) = other_comparable.downcast_ref::<Comparable>() else { - // The other system param is not Single - return true; - }; - - TypeId::of::<SingleComponent>() != comparable.single_component_type_id - } - - fn get_comparable() -> Box<dyn Any> - { - Box::new(Comparable { - single_component_type_id: TypeId::of::<SingleComponent>(), - }) - } -} - -impl<'world, SingleComponent> Deref for Single<'world, SingleComponent> -where - SingleComponent: Component, -{ - type Target = SingleComponent; - - fn deref(&self) -> &Self::Target - { - &self.single_component - } -} - -impl<'world, SingleComponent> DerefMut for Single<'world, SingleComponent> -where - SingleComponent: Component, -{ - fn deref_mut(&mut self) -> &mut Self::Target - { - &mut self.single_component - } -} - -struct Comparable -{ - single_component_type_id: TypeId, -} |