1 files changed, 12 insertions, 9 deletions

diff --git a/src/BlockEntities/HopperEntity.cpp b/src/BlockEntities/HopperEntity.cpp
index 2fac188b1..0467685af 100644
--- a/src/BlockEntities/HopperEntity.cpp
+++ b/src/BlockEntities/HopperEntity.cpp
@@ -193,7 +193,8 @@ bool cHopperEntity::MovePickupsIn(cChunk & a_Chunk, Int64 a_CurrentTick)
 {
 	UNUSED(a_CurrentTick);
 
-	class cHopperPickupSearchCallback
+	class cHopperPickupSearchCallback :
+		public cEntityCallback
 	{
 	public:
 		cHopperPickupSearchCallback(const Vector3i & a_Pos, cItemGrid & a_Contents) :
@@ -203,20 +204,22 @@ bool cHopperEntity::MovePickupsIn(cChunk & a_Chunk, Int64 a_CurrentTick)
 		{
 		}
 
-		bool operator () (cEntity & a_Entity)
+		virtual bool Item(cEntity * a_Entity) override
 		{
-			if (!a_Entity.IsPickup())
+			ASSERT(a_Entity != nullptr);
+
+			if (!a_Entity->IsPickup())
 			{
 				return false;
 			}
 
-			Vector3f EntityPos = a_Entity.GetPosition();
+			Vector3f EntityPos = a_Entity->GetPosition();
 			Vector3f BlockPos(m_Pos.x + 0.5f, static_cast<float>(m_Pos.y) + 1, m_Pos.z + 0.5f);  // One block above hopper, and search from center outwards
 			double Distance = (EntityPos - BlockPos).Length();
 
 			if (Distance < 0.5)
 			{
-				if (TrySuckPickupIn(static_cast<cPickup &>(a_Entity)))
+				if (TrySuckPickupIn(static_cast<cPickup *>(a_Entity)))
 				{
 					return false;
 				}
@@ -225,9 +228,9 @@ bool cHopperEntity::MovePickupsIn(cChunk & a_Chunk, Int64 a_CurrentTick)
 			return false;
 		}
 
-		bool TrySuckPickupIn(cPickup & a_Pickup)
+		bool TrySuckPickupIn(cPickup * a_Pickup)
 		{
-			cItem & Item = a_Pickup.GetItem();
+			cItem & Item = a_Pickup->GetItem();
 
 			for (int i = 0; i < ContentsWidth * ContentsHeight; i++)
 			{
@@ -235,7 +238,7 @@ bool cHopperEntity::MovePickupsIn(cChunk & a_Chunk, Int64 a_CurrentTick)
 				{
 					m_bFoundPickupsAbove = true;
 					m_Contents.SetSlot(i, Item);
-					a_Pickup.Destroy();  // Kill pickup
+					a_Pickup->Destroy();  // Kill pickup
 
 					return true;
 				}
@@ -249,7 +252,7 @@ bool cHopperEntity::MovePickupsIn(cChunk & a_Chunk, Int64 a_CurrentTick)
 
 					if (Item.IsEmpty())
 					{
-						a_Pickup.Destroy();  // Kill pickup if all items were added
+						a_Pickup->Destroy();  // Kill pickup if all items were added
 					}
 					return true;
 				}