add EcsWorld.GetPoolInstanceMarker

src/EcsWorld.pools.cs

@@ -83,6 +83,11 @@ namespace DCFApixels.DragonECS
         {
             return GetUnchecked<PoolCache<TPool>>(worldID).Instance;
         }
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public GetPoolInstanceMarker GetPoolInstance()
+        {
+            return new GetPoolInstanceMarker(this);
+        }
         #endregion
 
         #region ComponentInfo
@@ -418,6 +423,24 @@ namespace DCFApixels.DragonECS
             public bool locked;
 #endif
         }
+        public readonly ref struct GetPoolInstanceMarker
+        {
+            public readonly EcsWorld World;
+            public GetPoolInstanceMarker(EcsWorld world)
+            {
+                World = world;
+            }
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            public TPool GetInstance<TPool>() where TPool : IEcsPoolImplementation, new()
+            {
+                return World.GetPoolInstance<TPool>();
+            }
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            public TPool GetInstanceUnchecked<TPool>() where TPool : IEcsPoolImplementation, new()
+            {
+                return World.GetPoolInstanceUnchecked<TPool>();
+            }
+        }
         #endregion
     }
 }

src/Pools/EcsPool.cs

@@ -340,6 +340,7 @@ namespace DCFApixels.DragonECS
         public static implicit operator EcsPool<T>(IncludeMarker a) { return a.GetInstance<EcsPool<T>>(); }
         public static implicit operator EcsPool<T>(ExcludeMarker a) { return a.GetInstance<EcsPool<T>>(); }
         public static implicit operator EcsPool<T>(OptionalMarker a) { return a.GetInstance<EcsPool<T>>(); }
+        public static implicit operator EcsPool<T>(EcsWorld.GetPoolInstanceMarker a) { return a.GetInstance<EcsPool<T>>(); }
         #endregion
     }
     public static class EcsPoolExt

src/Pools/EcsTagPool.cs

@@ -291,6 +291,7 @@ namespace DCFApixels.DragonECS
         public static implicit operator EcsTagPool<T>(IncludeMarker a) { return a.GetInstance<EcsTagPool<T>>(); }
         public static implicit operator EcsTagPool<T>(ExcludeMarker a) { return a.GetInstance<EcsTagPool<T>>(); }
         public static implicit operator EcsTagPool<T>(OptionalMarker a) { return a.GetInstance<EcsTagPool<T>>(); }
+        public static implicit operator EcsTagPool<T>(EcsWorld.GetPoolInstanceMarker a) { return a.GetInstance<EcsTagPool<T>>(); }
         #endregion
     }
     public static class EcsTagPoolExt