hexga_generational 0.0.11-beta.56

GenVec, ideal for MAS (Multi-Agent System), where each agent can be removed at any time and has references to other agents.
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use hexga_generational::prelude::*;

#[derive(Debug)]
struct Entity
{
    name: &'static str,
    // GenID, by nature, can be NULL / always return none,
    // So there is no need to wrap it in an Option
    eating: GenID<Entity>,
}

fn main()
{
    let mut entities = GenVec::new();

    let zombie = entities.insert(Entity {
        name: "zombie",
        eating: GenID::NULL,
    });
    let slime = entities.insert(Entity { name: "slime", eating: zombie });

    let ouroboros = entities.insert_cyclic(|id| Entity { name: "Ouroboros", eating: id });

    if let Some(slime_entity) = entities.get_mut(slime)
    {
        slime_entity.eating = ouroboros;
    }

    for (id, entity) in &entities
    {
        println!("{:?} => name: {}, target: {:?}", id, entity.name, entity.eating);
    }
}