EntityToIdMap.cs

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using System;
using System.Collections.Generic;
 
namespace GameEntitySystem {
    public class EntityToIdMap {
        Dictionary<Entity, int> m_map;
 
        internal EntityToIdMap(Dictionary<Entity, int> map) => m_map = map;
 
        [Obsolete("Use Entity.Id instead.", true)]
        public int FindId(Entity entity) {
            if (entity != null
                && m_map.TryGetValue(entity, out int value)) {
                return value;
            }
            return 0;
        }
 
        [Obsolete("Use Component.Entity.Id instead.", true)]
        public int FindId(Component component) {
            if (component == null) {
                return 0;
            }
            return FindId(component.Entity);
        }
    }
}