bevy_ecs_markers 2.0.0

🏷️ Markers for Bevy ECS Entities
Documentation 
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use std::marker::PhantomData;
use std::ops::{Deref, DerefMut, Index, IndexMut};

use bevy_ecs::system::{ResMut, SystemParam};

use crate::entity_marker::EntityMarker;
use crate::{MarkerData, MarkerSlot};

/// A System Param that can read and modify the data from a given [`EntityMarker`]
#[derive(SystemParam)]
pub struct MarkerMut<'s, 'w, M: EntityMarker + 'static> {
    marker_data: ResMut<'w, MarkerData<M>>,
    #[system_param(ignore)]
    phantom: PhantomData<&'s ()>,
}

impl<M: EntityMarker> Deref for MarkerMut<'_, '_, M>
where
    M::Slots<MarkerSlot>: Deref<Target = MarkerSlot>,
{
    type Target = MarkerSlot;

    fn deref(&self) -> &Self::Target {
        self.marker_data.slots.deref()
    }
}

impl<M: EntityMarker> DerefMut for MarkerMut<'_, '_, M>
where
    M::Slots<MarkerSlot>: DerefMut<Target = MarkerSlot>,
{
    fn deref_mut(&mut self) -> &mut Self::Target {
        self.marker_data.slots.deref_mut()
    }
}

impl<M: EntityMarker> Index<M> for MarkerMut<'_, '_, M>
where
    M::Slots<MarkerSlot>: Index<usize, Output = MarkerSlot>,
{
    type Output = MarkerSlot;

    fn index(&self, index: M) -> &Self::Output {
        self.marker_data.slots.index(index.slot())
    }
}

impl<M: EntityMarker> IndexMut<M> for MarkerMut<'_, '_, M>
where
    M::Slots<MarkerSlot>: IndexMut<usize, Output = MarkerSlot>,
{
    fn index_mut(&mut self, index: M) -> &mut Self::Output {
        self.marker_data.slots.index_mut(index.slot())
    }
}