An experimental, status effects-as-entities system for Bevy.
More docs on merge functions.
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src/registry.rs
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src/registry.rs
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/// A function used to merge effects with [`EffectMode::Merge`](crate::EffectMode::Merge),
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/// which must be registered in the [registry](EffectMergeRegistry).
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///
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/// The component the function is registered for is guaranteed to exist on both provided entities.
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/// Note that the incoming entity exists in a **separate world**.
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///
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/// # Example
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/// ```rust
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/// # use bevy_ecs::prelude::*;
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/// struct MyEffect(f32);
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///
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/// fn merge_my_effect(mut existing: EntityWorldMut, incoming: EntityRef) {
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/// let mut existing = existing.get_mut::<MyEffect>().unwrap();
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/// let incoming = incoming.get::<MyEffect>().unwrap();
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/// existing.get_mut::<MyEffect>().unwrap().0 += incoming.0;
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/// existing.0 += incoming.0;
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/// }
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/// ```
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pub type EffectMergeFn = fn(existing: EntityWorldMut, incoming: EntityRef);
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/// }
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///
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/// fn merge_my_effect(mut existing: EntityWorldMut, incoming: EntityRef) {
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/// let mut existing = existing.get_mut::<MyEffect>().unwrap();
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/// let incoming = incoming.get::<MyEffect>().unwrap();
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/// existing.get_mut::<MyEffect>().unwrap().0 += incoming.0;
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/// existing.0 += incoming.0;
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/// }
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/// ```
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#[derive(Resource, Default)]