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use component::ComponentManager;
use entity::EntityData;
pub struct Aspect<C: ComponentManager>(Box<AspectFilter<C> + 'static>);
impl<C: ComponentManager> Aspect<C> {
pub fn all() -> Self {
Aspect(Box::new(All))
}
pub fn none() -> Self {
Aspect(Box::new(None))
}
pub fn new<A>(aspect_filter: A) -> Self
where
A: AspectFilter<C>,
{
Aspect(Box::new(aspect_filter))
}
pub fn check<'a>(&self, entity: EntityData<'a, C>, components: &C) -> bool {
self.0.check(entity, components)
}
}
pub trait AspectFilter<C: ComponentManager>: 'static {
fn check<'a>(&self, entity: EntityData<'a, C>, components: &C) -> bool;
}
impl<F, C> AspectFilter<C> for F
where
C: ComponentManager,
F: Fn(EntityData<C>, &C) -> bool + 'static,
{
#[inline]
fn check<'a>(&self, entity: EntityData<'a, C>, components: &C) -> bool {
(*self)(entity, components)
}
}
struct All;
struct None;
impl<C> AspectFilter<C> for All
where
C: ComponentManager,
{
#[inline]
fn check<'a>(&self, _: EntityData<'a, C>, _: &C) -> bool {
true
}
}
impl<C> AspectFilter<C> for None
where
C: ComponentManager,
{
#[inline]
fn check<'a>(&self, _: EntityData<'a, C>, _: &C) -> bool {
false
}
}