fix changes

src/EcsGroup.cs

@@ -5,6 +5,8 @@ using delayedOp = System.Int32;
 
 namespace DCFApixels.DragonECS
 {
+
+
     [StructLayout(LayoutKind.Sequential, Pack = 0, Size = 8)]
     public readonly ref struct EcsReadonlyGroup
     {
@@ -242,7 +244,7 @@ namespace DCFApixels.DragonECS
             private readonly EcsGroup _source;
             private readonly int[] _dense;
             private readonly int _count;
-            private int _pointer;
+            private int _index;
 
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             public Enumerator(EcsGroup group)
@@ -250,26 +252,22 @@ namespace DCFApixels.DragonECS
                 _source = group;
                 _dense = group._dense;
                 _count = group.Count;
-                _pointer = 0;
+                _index = 0;
             }
-
             public ent Current
             {
                 [MethodImpl(MethodImplOptions.AggressiveInlining)]
-                get => _source.World.GetEntity(_dense[_pointer]);
+                get => _source.World.GetEntity(_dense[_index]);
             }
-
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             public bool MoveNext()
             {
-                return ++_pointer <= _count && _count < _dense.Length; //_count < _dense.Length дает среде понять что проверки на выход за границы не нужны
+                // <= потму что отсчет начинается с индекса 1
+                return ++_index <= _count && _count < _dense.Length; //_count < _dense.Length дает среде понять что проверки на выход за границы не нужны
             }
 
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            public void Dispose()
-            {
-                _source.Unlock();
-            }
+            public void Dispose() => _source.Unlock();
 
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             public void Reset() { }

src/EcsPool.cs

@@ -1,60 +1,51 @@
 using System;
-using System.Linq;
 using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
 using Unity.Profiling;
 
 namespace DCFApixels.DragonECS
 {
     public interface IEcsPool
     {
-        public int EntitiesCount { get; }
-        public int Capacity { get; }
-
+        public Type ComponentType { get; }
+        public int ComponentID { get; }
         public IEcsWorld World { get; }
-        public Type DataType { get; }
-        public int ID { get; }
+        public int Count { get; }
+        public int Capacity { get; }
         public bool Has(int entityID);
         public void Write(int entityID);
         public void Del(int entityID);
-
         internal void OnWorldResize(int newSize);
     }
-
-    public interface IEcsPool<T> : IEcsPool
-        where T : struct
+    public interface IEcsPool<T> : IEcsPool where T : struct
     {
         public ref readonly T Read(int entity);
         public new ref T Write(int entity);
     }
 
-    public class EcsNullPool : IEcsPool
+    public struct NullComponent { }
+    public sealed class EcsNullPool : IEcsPool<NullComponent>
     {
+        public static EcsNullPool instance => new EcsNullPool(null);
         private readonly IEcsWorld _source;
-
-        public EcsNullPool(IEcsWorld source)
-        {
-            _source = source;
-        }
-
+        private EcsNullPool(IEcsWorld source) => _source = source;
+        private NullComponent fakeComponent;
+        public Type ComponentType => typeof(NullComponent);
+        public int ComponentID => -1;
         public IEcsWorld World => _source;
-        public Type DataType => typeof(void);
-        public int ID => -1;
-
-        public int EntitiesCount => 0;
+        public int Count => 0;
         public int Capacity => 1;
-
         public void Del(int index) { }
         public bool Has(int index) => false;
-        public void Write(int index) { }
-
+        void IEcsPool.Write(int entityID) { }
+        public ref readonly NullComponent Read(int entity) => ref fakeComponent;
+        public ref NullComponent Write(int entity) => ref fakeComponent;
         void IEcsPool.OnWorldResize(int newSize) { }
     }
 
-    public class EcsPool<T> : IEcsPool<T>
+    public sealed class EcsPool<T> : IEcsPool<T>
         where T : struct
     {
-        private readonly int _id;
+        private readonly int _componentID;
         private readonly IEcsWorld _source;
 
         private int[] _mapping;// index = entity / value = itemIndex;/ value = 0 = no entity
@@ -68,19 +59,18 @@ namespace DCFApixels.DragonECS
         private PoolRunnres _poolRunnres;
 
         #region Properites
-        public int EntitiesCount => _itemsCount;
+        public int Count => _itemsCount;
         public int Capacity => _items.Length;
-
         public IEcsWorld World => _source;
-        public Type DataType => typeof(T);
-        public int ID => _id;
+        public Type ComponentType => typeof(T);
+        public int ComponentID => _componentID;
         #endregion
 
         #region Constructors
         internal EcsPool(IEcsWorld source, int id, int capacity, PoolRunnres poolRunnres)
         {
             _source = source;
-            _id = id;
+            _componentID = id;
 
             _mapping = new int[source.EntitesCapacity];
             _recycledItems = new int[128];
@@ -94,7 +84,6 @@ namespace DCFApixels.DragonECS
         #endregion
 
         #region Write/Read/Has/Del
-
         private ProfilerMarker _writeMark = new ProfilerMarker("EcsPoo.Write");
         private ProfilerMarker _readMark = new ProfilerMarker("EcsPoo.Read");
         private ProfilerMarker _hasMark = new ProfilerMarker("EcsPoo.Has");
@@ -119,7 +108,7 @@ namespace DCFApixels.DragonECS
                 }
                 _mapping[entityID] = itemIndex;
                 _componentResetHandler.Reset(ref _items[itemIndex]);
-                _source.OnEntityComponentAdded(entityID, _id);
+                _source.OnEntityComponentAdded(entityID, _componentID);
                 _poolRunnres.add.OnComponentAdd<T>(entityID);
             }
 
@@ -148,7 +137,7 @@ namespace DCFApixels.DragonECS
             _recycledItems[_recycledItemsCount++] = _mapping[entityID];
             _mapping[entityID] = 0;
             _itemsCount--;
-            _source.OnEntityComponentRemoved(entityID, _id);
+            _source.OnEntityComponentRemoved(entityID, _componentID);
             _poolRunnres.del.OnComponentDel<T>(entityID);
             // }
         } 
@@ -161,17 +150,16 @@ namespace DCFApixels.DragonECS
         }
         #endregion
 
-        #region Equals/GetHashCode
-        public override bool Equals(object obj)
-        {
-            return base.Equals(obj);
-        }
-        public override int GetHashCode() => _source.GetHashCode() + ID;
+        #region Object
+        public override bool Equals(object obj) => base.Equals(obj);
+        public override int GetHashCode() => _source.GetHashCode() + ~ComponentID;
         #endregion
 
+        #region Internal
         void IEcsPool.OnWorldResize(int newSize)
         {
             Array.Resize(ref _mapping, newSize);
         }
+        #endregion
     }
 }

src/EcsRelationTable.cs

@@ -1,46 +1,51 @@
 using DCFApixels.DragonECS;
+using DCFApixels.DragonECS.Internal;
 using System;
 using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using UnityEditorInternal;
 
-namespace DCFApixels.Assets.DragonECS.src
+namespace DCFApixels.DragonECS
 {
-    public class EcsRelationTable
+  /*  public interface IEcsRealationTable : IEcsReadonlyTable
+    {
+        public EcsFilter Relations<TComponent>() where TComponent : struct;
+
+    }
+    public sealed class EcsRelationTable<TArchetype> : IEcsRealationTable
+         where TArchetype : EcsRelationTableArchetypeBase
     {
         public readonly IEcsWorld leftWorld;
         public readonly IEcsWorld rightWorld;
 
-
-        private int[] _relationEntities; //dense
+        private int[] _relations; //dense
         private int[] _leftMapping;
         private int[] _rgihtMapping;
 
         private int _relationsCount;
 
+        private IEcsPool[] _pools;
+        private EcsNullPool _nullPool;
 
         #region Properties
-        public int RelationsCount
-        {
-            get => _relationsCount;
-        }
+        public Type ArchetypeType => typeof(TArchetype);
+        public int EntitesCount => _relationsCount;
+        public int EntitesCapacity => _relations.Length;
         #endregion
 
-
+        #region Constructors
         internal EcsRelationTable(IEcsWorld leftWorld, IEcsWorld rightWorld)
         {
             this.leftWorld = leftWorld;
             this.rightWorld = rightWorld;
 
-            _relationEntities = new int[512];
+            _relations = new int[512];
             _leftMapping = new int[512];
             _rgihtMapping = new int[512];
 
             _relationsCount = 0;
         }
+        #endregion
 
+        #region RealtionControls
         public void AddRelation(int leftEnttiyID, int rightEntityID)
         {
 
@@ -53,5 +58,80 @@ namespace DCFApixels.Assets.DragonECS.src
         {
 
         }
-    }
+        #endregion
+
+        public ReadOnlySpan<IEcsPool> GetAllPools()
+        {
+            throw new NotImplementedException();
+        }
+
+        public int GetComponentID<T>()
+        {
+            throw new NotImplementedException();
+        }
+
+        public EcsPool<T> GetPool<T>() where T : struct
+        {
+            throw new NotImplementedException();
+        }
+
+        public EcsPool<T> UncheckedGetPool<T>() where T : struct
+        {
+            throw new NotImplementedException();
+        }
+
+        public EcsFilter Entities<TComponent>() where TComponent : struct
+        {
+            throw new NotImplementedException();
+        }
+
+        public EcsFilter Filter<TInc>() where TInc : struct, IInc
+        {
+            throw new NotImplementedException();
+        }
+
+        public EcsFilter Filter<TInc, TExc>()
+            where TInc : struct, IInc
+            where TExc : struct, IExc
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool IsMaskCompatible<TInc>(int entity) where TInc : struct, IInc
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool IsMaskCompatible<TInc, TExc>(int entity)
+            where TInc : struct, IInc
+            where TExc : struct, IExc
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool IsMaskCompatible(EcsMask mask, int entity)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool IsMaskCompatibleWithout(EcsMask mask, int entity, int otherPoolID)
+        {
+            throw new NotImplementedException();
+        }
+
+        void IEcsReadonlyTable.OnEntityComponentAdded(int entityID, int changedPoolID)
+        {
+            throw new NotImplementedException();
+        }
+
+        void IEcsReadonlyTable.OnEntityComponentRemoved(int entityID, int changedPoolID)
+        {
+            throw new NotImplementedException();
+        }
+
+        void IEcsReadonlyTable.RegisterGroup(EcsGroup group)
+        {
+            throw new NotImplementedException();
+        }
+    }*/
 }

src/EcsWorld.cs

@@ -1,52 +1,29 @@
-using System;
+using DCFApixels.DragonECS.Internal;
+using System;
 using System.Collections.Generic;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
 namespace DCFApixels.DragonECS
 {
-    public interface IEcsWorld
+    public interface IEcsWorld : IEcsReadonlyTable
     {
         #region Properties
         //private float _timeScale;//TODO реализовать собсвенныйтайм склей для разных миров
-        public bool IsEmpty { get; }
-        public Type ArchetypeType { get; }
         public int ID { get; }
         public EcsPipeline Pipeline { get; }
         public int EntitesCount { get; }
         public int EntitesCapacity { get; }
         #endregion
 
-        #region GetterMethods
-        public ReadOnlySpan<IEcsPool> GetAllPools();
-
-        #endregion
-
-        #region Methods
-        public EcsPool<T> GetPool<T>() where T : struct;
-        public EcsPool<T> UncheckedGetPool<T>() where T : struct;
+        #region Entities
         public EcsFilter Entities<TComponent>() where TComponent : struct;
-        public EcsFilter Filter<TInc>() where TInc : struct, IInc;
-        public EcsFilter Filter<TInc, TExc>() where TInc : struct, IInc where TExc : struct, IExc;
+
         public ent NewEntity();
         public void DelEntity(ent entity);
         public bool EntityIsAlive(int entityID, short gen);
         public ent GetEntity(int entityID);
         public void Destroy();
-
-        public bool IsMaskCompatible<TInc>(int entity) where TInc : struct, IInc;
-        public bool IsMaskCompatible<TInc, TExc>(int entity) where TInc : struct, IInc where TExc : struct, IExc;
-
-
-        public bool IsMaskCompatible(EcsMask mask, int entity);
-        public bool IsMaskCompatibleWithout(EcsMask mask, int entity, int otherPoolID);
-
-        internal void OnEntityComponentAdded(int entityID, int changedPoolID);
-        internal void OnEntityComponentRemoved(int entityID, int changedPoolID);
-
-        public int GetComponentID<T>();
-
-        internal void RegisterGroup(EcsGroup group);
         #endregion
     }
 
@@ -57,12 +34,19 @@ namespace DCFApixels.DragonECS
 
         public readonly short id;
 
-        public EcsWorld()
+        protected EcsWorld(bool isIndexed)
         {
-            id = (short)_worldIdDispenser.GetFree();
-            if(id >= Worlds.Length)
-                Array.Resize(ref Worlds, Worlds.Length << 1);
-            Worlds[id] = (IEcsWorld)this;
+            if(isIndexed == true)
+            {
+                id = (short)_worldIdDispenser.GetFree();
+                if (id >= Worlds.Length)
+                    Array.Resize(ref Worlds, Worlds.Length << 1);
+                Worlds[id] = (IEcsWorld)this;
+            }
+            else
+            {
+                id = -1;
+            }
         }
 
         protected void Realeze()    
@@ -106,8 +90,12 @@ namespace DCFApixels.DragonECS
 
         #endregion
 
+        #region Internal Properties
+        int IEcsReadonlyTable.Count => _entitiesCount;
+        int IEcsReadonlyTable.Capacity => _denseEntities.Length;
+        #endregion
+
         #region Properties
-        public bool IsEmpty => _entitiesCount < 0;
         public Type ArchetypeType => typeof(TArchetype);
         public int ID => id;
         public EcsPipeline Pipeline => _pipeline;
@@ -117,12 +105,12 @@ namespace DCFApixels.DragonECS
         #endregion
 
         #region Constructors
-        public EcsWorld(EcsPipeline pipline = null)
+        public EcsWorld(EcsPipeline pipline = null) : base(true)
         {
             _pipeline = pipline ?? EcsPipeline.Empty;
             if (!_pipeline.IsInit) pipline.Init();
             _entityDispenser = new IntDispenser(1);
-            _nullPool = new EcsNullPool(this);
+            _nullPool = EcsNullPool.instance;
             _pools = new IEcsPool[512];
             FillArray(_pools, _nullPool);
 
@@ -154,7 +142,6 @@ namespace DCFApixels.DragonECS
                 int oldCapacity = _pools.Length;
                 Array.Resize(ref _pools, ComponentType.Capacity);
                 FillArray(_pools, _nullPool, oldCapacity, oldCapacity - _pools.Length);
-                //Array.Fill(_pools, _nullPool, oldCapacity, oldCapacity - _pools.Length); //TODO Fix it
 
                 Array.Resize(ref _filtersByIncludedComponents, ComponentType.Capacity);
                 Array.Resize(ref _filtersByExcludedComponents, ComponentType.Capacity);
@@ -285,7 +272,7 @@ namespace DCFApixels.DragonECS
 
         #region EntityChangedReact
 
-        void IEcsWorld.OnEntityComponentAdded(int entityID, int componentID)
+        void IEcsReadonlyTable.OnEntityComponentAdded(int entityID, int componentID)
         {
             var includeList = _filtersByIncludedComponents[componentID];
             var excludeList = _filtersByExcludedComponents[componentID];
@@ -316,7 +303,7 @@ namespace DCFApixels.DragonECS
             // if (excludeList != null) foreach (var filter in excludeList) filter.entities.Remove(entityID);
         }
 
-        void IEcsWorld.OnEntityComponentRemoved(int entityID, int componentID)
+        void IEcsReadonlyTable.OnEntityComponentRemoved(int entityID, int componentID)
         {
             var includeList = _filtersByIncludedComponents[componentID];
             var excludeList = _filtersByExcludedComponents[componentID];
@@ -458,7 +445,7 @@ namespace DCFApixels.DragonECS
         #endregion
 
         #region Other
-        void IEcsWorld.RegisterGroup(EcsGroup group)
+        void IEcsReadonlyTable.RegisterGroup(EcsGroup group)
         {
             _groups.Add(group);
         }

src/Interfaces/IEcsReadonlyTable.cs

@@ -6,45 +6,46 @@ using System.Threading.Tasks;
 
 namespace DCFApixels.DragonECS
 {
-    public interface IEcsEntityComponentTable
+    public interface IEcsReadonlyTable
     {
         #region Properties
-        public bool IsEmpty { get; }
+        /// <summary>Table Archetype</summary>
         public Type ArchetypeType { get; }
-        //public int ID { get; }
-        public int EntitesCount { get; }
-        public int EntitesCapacity { get; }
-        #endregion
-
-        #region GetterMethods
-        public ReadOnlySpan<IEcsPool> GetAllPools();
-
         #endregion
 
         #region Methods
+        public ReadOnlySpan<IEcsPool> GetAllPools();
+        public int GetComponentID<T>();
+
         public EcsPool<T> GetPool<T>() where T : struct;
         public EcsPool<T> UncheckedGetPool<T>() where T : struct;
 
-        public EcsFilter Entities<TComponent>() where TComponent : struct;
         public EcsFilter Filter<TInc>() where TInc : struct, IInc;
         public EcsFilter Filter<TInc, TExc>() where TInc : struct, IInc where TExc : struct, IExc;
 
-        public ent NewEntity();
-        public void DelEntity(ent entity);
-        public bool EntityIsAlive(int entityID, short gen);
-        public ent GetEntity(int entityID);
-        public void Destroy();
-
         public bool IsMaskCompatible<TInc>(int entity) where TInc : struct, IInc;
         public bool IsMaskCompatible<TInc, TExc>(int entity) where TInc : struct, IInc where TExc : struct, IExc;
         public bool IsMaskCompatible(EcsMask mask, int entity);
         public bool IsMaskCompatibleWithout(EcsMask mask, int entity, int otherPoolID);
+        #endregion
 
+        #region Properties
+        internal int Count { get; }
+        internal int Capacity { get; }
+        #endregion
+
+        #region Internal Methods
         internal void OnEntityComponentAdded(int entityID, int changedPoolID);
         internal void OnEntityComponentRemoved(int entityID, int changedPoolID);
-
-        public int GetComponentID<T>();
         internal void RegisterGroup(EcsGroup group);
         #endregion
     }
+
+    public static class IEcsReadonlyEntityComponentTableExtensions
+    {
+        public static bool IsNullOrEmpty(this IEcsReadonlyTable self)
+        {
+            return self == null || self.Count <= 0;
+        }
+    }
 }

src/Interfaces/INullDummy.cs

@@ -0,0 +1,7 @@
+namespace DCFApixels.DragonECS
+{
+    public interface INullDummy
+    {
+        public bool IsDummy { get; }
+    }
+}

src/Utils/EcsRelationTableArchetype.cs

@@ -0,0 +1,16 @@
+using System;
+
+namespace DCFApixels.DragonECS.Internal
+{
+    public abstract class EcsRelationTableArchetypeBase
+    {
+        public EcsRelationTableArchetypeBase()
+        {
+            throw new TypeAccessException("Сreating instances of EcsRelationTableArchetype class is not available.");
+        }
+    }
+    public sealed class EcsRelationTableArchetype<TLeftWorld, TRightWorld> : EcsRelationTableArchetypeBase
+        where TLeftWorld : EcsWorld<TLeftWorld>
+        where TRightWorld : EcsWorld<TRightWorld>
+    { }
+}

src/Utils/ITabelRecord.cs

@@ -0,0 +1,8 @@
+namespace DCFApixels.DragonECS
+{
+    public interface ITabelRecord
+    {
+        //TODO rename to index; Так ent по определению станет идентификатором
+        public int Id { get; }
+    }
+}

src/ent.cs

@@ -5,16 +5,26 @@ using System.Runtime.InteropServices;
 
 namespace DCFApixels.DragonECS
 {
+    public interface IEntityRecord : ITabelRecord
+    {
+        public bool IsSpecific { get; }
+        internal long Full { get; }
+        public short Gen { get; }
+        public short World { get; }
+    }
     // id - 32 bits
     // gen - 16 bits
     // world - 16 bits
     [StructLayout(LayoutKind.Explicit, Pack = 2, Size = 8)]
-    public readonly struct ent : IEquatable<long>, IEquatable<ent>
+    public readonly partial struct ent : 
+        IEquatable<long>, 
+        IEquatable<ent>,
+        IEntityRecord
     {
         public static readonly ent NULL = default;
 
         [FieldOffset(0)]
-        private readonly long _full;
+        internal readonly long full; //Union
         [FieldOffset(3)]
         public readonly int id;
         [FieldOffset(1)]
@@ -22,44 +32,41 @@ namespace DCFApixels.DragonECS
         [FieldOffset(0)]
         public readonly short world;
 
+        #region IEntityRecord
+        bool IEntityRecord.IsSpecific => false;
+        long IEntityRecord.Full => full;
+        int ITabelRecord.Id => id;
+        short IEntityRecord.Gen => gen;
+        short IEntityRecord.World => world;
+        #endregion
+
         #region Constructors
-        [EditorBrowsable(EditorBrowsableState.Never)]
-        public ent(int id, short gen, short world): this()
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public ent(int id, short gen, short world) : this()
         {
             this.id = id;
             this.gen = gen;
             this.world = world;
         }
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         internal ent(long full) : this()
         {
-            _full = full;
+            this.full = full;
         }
         #endregion
 
         #region GetHashCode
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public override int GetHashCode()
-        {
-            return unchecked((int)(_full)) ^ (int)(_full >> 32);
-        }
+        public override int GetHashCode() => unchecked((int)(full)) ^ (int)(full >> 32);
         #endregion
 
         #region Equals
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public override bool Equals(object obj)
-        {
-            return obj is ent other && _full == other._full;
-        }
+        public override bool Equals(object obj) => obj is ent other && full == other.full;
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public bool Equals(ent other)
-        {
-            return _full == other._full;
-        }
+        public bool Equals(ent other) => full == other.full;
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public bool Equals(long other)
-        {
-            return _full == other;
-        }
+        public bool Equals(long other) => full == other;
         #endregion
 
         #region ToString
@@ -69,31 +76,72 @@ namespace DCFApixels.DragonECS
 
         #region operators
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static bool operator ==(in ent a, in ent b) => a._full == b._full;
-
+        public static bool operator ==(in ent a, in ent b) => a.full == b.full;
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static bool operator !=(in ent a, in ent b) => a._full != b._full;
-
+        public static bool operator !=(in ent a, in ent b) => a.full != b.full;
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static explicit operator long(in ent a) => a._full;
-
+        public static explicit operator long(in ent a) => a.full;
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static explicit operator int(in ent a) => a.id;
-
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static explicit operator ent(in long a) => new ent(a);
         #endregion
     }
 
-    public static partial class entExtensions
+    public readonly partial struct ent
     {
-        private static EcsProfilerMarker _IsAliveMarker = new EcsProfilerMarker("ent.IsAlive");
         private static EcsProfilerMarker _IsNullMarker = new EcsProfilerMarker("ent.IsNull");
         private static EcsProfilerMarker _ReadMarker = new EcsProfilerMarker("ent.Read");
         private static EcsProfilerMarker _WriteMarker = new EcsProfilerMarker("ent.Write");
         private static EcsProfilerMarker _HasMarker = new EcsProfilerMarker("ent.Has");
         private static EcsProfilerMarker _DelMarker = new EcsProfilerMarker("ent.Del");
 
+        public bool IsNull
+        {
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get
+            {
+                //using (_IsNullMarker.Auto())
+                return this == NULL;
+            }
+        }
+
+        public ref readonly T Read<T>()
+            where T : struct
+        {
+            //using (_ReadMarker.Auto())
+            return ref EcsWorld.Worlds[world].GetPool<T>().Read(id);
+        }
+        public ref T Write<T>()
+            where T : struct
+        {
+            //using (_WriteMarker.Auto())
+            return ref EcsWorld.Worlds[world].GetPool<T>().Write(id);
+        }
+        public bool Has<T>()
+            where T : struct
+        {
+            //using (_HasMarker.Auto())
+            return EcsWorld.Worlds[world].GetPool<T>().Has(id);
+        }
+        public bool NotHas<T>()
+            where T : struct
+        {
+            //using (_HasMarker.Auto())
+            return EcsWorld.Worlds[world].GetPool<T>().Has(id);
+        }
+        public void Del<T>()
+            where T : struct
+        {
+            //using (_DelMarker.Auto())
+            EcsWorld.Worlds[world].GetPool<T>().Del(id);
+        }
+    } 
+
+    public static partial class entExtensions
+    {
+        private static EcsProfilerMarker _IsAliveMarker = new EcsProfilerMarker("ent.IsAlive");
+
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static bool IsAlive(this ref ent self)
         {
@@ -104,43 +152,5 @@ namespace DCFApixels.DragonECS
                 return result;
             //}
         }
-
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static bool IsNull(this in ent self)
-        {
-            //using (_IsNullMarker.Auto())
-                return self == ent.NULL;
-        }
-
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static ref readonly T Read<T>(this in ent self)
-            where T : struct
-        {
-            //using (_ReadMarker.Auto())
-                return ref EcsWorld.Worlds[self.world].GetPool<T>().Read(self.id);
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static ref T Write<T>(this in ent self)
-            where T : struct
-        {
-            //using (_WriteMarker.Auto())
-                return ref EcsWorld.Worlds[self.world].GetPool<T>().Write(self.id);
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static bool Has<T>(this in ent self)
-            where T : struct
-        {
-            //using (_HasMarker.Auto())
-                return EcsWorld.Worlds[self.world].GetPool<T>().Has(self.id);
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static bool NotHas<T>(this in ent self) where T : struct => !Has<T>(in self);
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static void Del<T>(this in ent self)
-            where T : struct
-        {
-            //using (_DelMarker.Auto())
-                EcsWorld.Worlds[self.world].GetPool<T>().Del(self.id);
-        }
     }
 }

src/rel.cs

@@ -16,14 +16,21 @@ namespace DCFApixels.DragonECS.TODO
 
 
 
-    // left entity id - 32 bits
-    // right entity id - 32 bits
-    [StructLayout(LayoutKind.Explicit, Pack = 4, Size = 8)]
-    public struct rel
+    [StructLayout(LayoutKind.Sequential, Pack = 0, Size = 8)]
+    public readonly ref partial struct rel
     {
-        [FieldOffset(0)]
-        public int l;
-        [FieldOffset(1)]
-        public int r;
+        public readonly int id;
+        public readonly short leftWorld;
+        public readonly short rightWorld;
+
+        #region Constructors
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public rel(int id, short leftWorld, short rightWorld)
+        {
+            this.id = id;
+            this.leftWorld = leftWorld;
+            this.rightWorld = rightWorld;
+        }
+        #endregion
     }
 }