qmi 0.1.1

An ECS with too much macro usage
Documentation 
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use crate::EntityID;
use std::collections::HashMap;

pub trait ComponentStorage {
    fn as_any(&self) -> &dyn std::any::Any;
    fn as_any_mut(&mut self) -> &mut dyn std::any::Any;
    fn serialize(&self) -> Result<Vec<u8>, postcard::Error>;
    fn type_name(&self) -> &'static str;
}

pub struct ComponentPool<T> {
    pub dense_data: Vec<T>,
    pub dense_entities: Vec<EntityID>,
    pub sparse_map: HashMap<EntityID, usize>,
}

impl<T: 'static + serde::Serialize> ComponentStorage for ComponentPool<T> {
    fn as_any(&self) -> &dyn std::any::Any {
        self
    }
    fn as_any_mut(&mut self) -> &mut dyn std::any::Any {
        self
    }
    fn serialize(&self) -> Result<Vec<u8>, postcard::Error> {
        postcard::to_allocvec(&(&self.sparse_map, &self.dense_entities, &self.dense_data))
    }
    fn type_name(&self) -> &'static str {
        std::any::type_name::<T>()
    }
}
impl<T> ComponentPool<T> {
    pub fn iter_entities(&self) -> impl Iterator<Item = (EntityID, &T)> {
        self.sparse_map
            .iter()
            .map(move |(&entity_id, &dense_index)| (entity_id, &self.dense_data[dense_index]))
    }
    pub fn iter_entities_mut(&mut self) -> impl Iterator<Item = (EntityID, &mut T)> {
        let dense_ptr = self.dense_data.as_mut_ptr();
        self.sparse_map
            .iter()
            .map(move |(&entity_id, &dense_index)| unsafe {
                (entity_id, &mut *dense_ptr.add(dense_index))
            })
    }
}