fix some errors

remove some redundant methods

Svelto.ECS/DataStructures/TypeSafeFasterListForECS.cs

@@ -43,14 +43,7 @@ namespace Svelto.ECS.Internal
 
             if (UnorderedRemoveAt(index))
             {
-                try
-                {
-                    _mappedIndices.Add(this[index].ID.GID, index);
-                }
-                catch (Exception e)
-                {
-                    throw new TypeSafeFasterListForECSException(e);
-                }
+                _mappedIndices[this[index].ID.GID] = index;
             }
 
             return Count > 0;

Svelto.ECS/EGID.cs

@@ -1,4 +1,5 @@
 using DBC;
+using Svelto.ECS.Internal;
 
 namespace Svelto.ECS
 {
@@ -25,6 +26,11 @@ namespace Svelto.ECS
         {
             _GID = MAKE_GLOBAL_ID(entityID, groupID);
         }
+        
+        public EGID(int entityID) : this()
+        {
+            _GID = MAKE_GLOBAL_ID(entityID, ExclusiveGroups.StandardEntity);
+        }
 
         int MAKE_GLOBAL_ID(int entityId, int groupId)
         {
@@ -34,5 +40,10 @@ namespace Svelto.ECS
 #endif
             return entityId | groupId << 24;
         }
+
+        public bool IsEqualTo(EGID otherGID)
+        {
+            return otherGID._GID == _GID;
+        }
     }
 }

Svelto.ECS/EnginesRootEntities.cs

@@ -127,7 +127,9 @@ namespace Svelto.ECS
 
         void RemoveEntity(EGID entityGID)
         {
-            _DB.TryQueryEntityView<EntityInfoView>(entityGID, out var entityInfoView);
+            EntityInfoView entityInfoView;
+            
+            _DB.TryQueryEntityView(entityGID, out entityInfoView);
 
             var entityViewBuilders = entityInfoView.entityViews;
             EGID id = entityInfoView._ID;
@@ -231,7 +233,9 @@ namespace Svelto.ECS
             Check.Require(fromGroupID != toGroupID,
                           "can't move an entity to the same group where it already belongs to");
 
-            _DB.TryQueryEntityViewInGroup(fromGroupID, entityID, out EntityInfoView entityInfoView);
+            EntityInfoView entityInfoView;
+                
+            _DB.TryQueryEntityView(new EGID(fromGroupID, entityID), out entityInfoView);
             
             var entityViewBuilders      = entityInfoView.entityViews;
             var entityViewBuildersCount = entityViewBuilders.Length;

Svelto.ECS/EntityViewsDB.cs

@@ -71,15 +71,6 @@ namespace Svelto.ECS.Internal
             return FasterList<T>.NoVirt.ToArrayFast((FasterList<T>)entitiesInGroupPerType[type], out count);
         }
 
-        public T QueryEntityView<T>(int entityID) where T:EntityView
-        {
-            T entityView;
-
-            TryQueryEntityViewInGroup(new EGID(entityID, ExclusiveGroups.StandardEntity), out entityView);
-
-            return entityView;
-        }
-
         public T QueryEntityView<T>(EGID entityGID) where T : EntityView
         {
             T entityView;
@@ -89,30 +80,11 @@ namespace Svelto.ECS.Internal
             return entityView;
         }
 
-        public bool TryQueryEntityView<T>(int entityID, out T entityView) where T:EntityView
-        {
-            return TryQueryEntityViewInGroup(new EGID(entityID, ExclusiveGroups.StandardEntity), out entityView);
-        }
-
         public bool TryQueryEntityView<T>(EGID entityegid, out T entityView) where T : EntityView
         {
             return TryQueryEntityViewInGroup(entityegid, out entityView);
         }
 
-        public T QueryEntityViewInGroup<T>(int entityID, int groupID) where T:EntityView
-        {
-            T entityView;
-
-            TryQueryEntityViewInGroup(entityID, groupID, out entityView);
-
-            return entityView;
-        }
-
-        public bool TryQueryEntityViewInGroup<T>(int entityID, int groupID, out T entityView) where T : EntityView
-        {
-            return TryQueryEntityViewInGroup(new EGID(entityID, groupID), out entityView);
-        }
-
         bool TryQueryEntityViewInGroup<T>(EGID entityGID, out T entityView) where T:EntityView
         {
             var type = typeof(T);

Svelto.ECS/Extensions/Unity/GenericEntityDescriptorHolder.cs

@@ -5,7 +5,7 @@ namespace Svelto.ECS
         UnityEngine.MonoBehaviour , IEntityDescriptorHolder
             where T: class, IEntityDescriptor, new()
     {
-        public IEntityDescriptorInfo RetrieveDescriptor()
+        public EntityDescriptorInfo RetrieveDescriptor()
         {
             return EntityDescriptorTemplate<T>.Default;
         }

Svelto.ECS/IEntityViewsDB.cs

@@ -10,12 +10,7 @@ namespace Svelto.ECS
         T[] QueryEntityViewsAsArray<T>(out int    count) where T : IEntityView;
         T[] QueryGroupedEntityViewsAsArray<T>(int group, out int count) where T : IEntityView;
 
-        bool TryQueryEntityView<T>(int ID, out T entityView) where T : EntityView;
         bool TryQueryEntityView<T>(EGID ID, out T entityView) where T : EntityView;
-        T    QueryEntityView<T>(int    ID) where T : EntityView;
         T    QueryEntityView<T>(EGID entityGID) where T : EntityView;
-
-        bool TryQueryEntityViewInGroup<T>(int entityID, int groupID, out T entityView) where T : EntityView;
-        T    QueryEntityViewInGroup<T>(int entityID, int groupID) where T : EntityView;
     }
 }