Refactor and improve collections code

#3043

Source/Engine/Core/Memory/AllocationUtils.h

@@ -0,0 +1,24 @@
+// Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "Allocation.h"
+#include "Engine/Core/Templates.h"
+
+namespace AllocationUtils
+{
+    // Moves the data from the source allocation to the destination allocation.
+    template<typename T, typename AllocationType>
+    inline void MoveToEmpty(typename AllocationType::template Data<T>& to, typename AllocationType::template Data<T>& from, const int32 fromCount, const int32 fromCapacity)
+    {
+        if IF_CONSTEXPR (AllocationType::HasSwap)
+            to.Swap(from);
+        else
+        {
+            to.Allocate(fromCapacity);
+            Memory::MoveItems(to.Get(), from.Get(), fromCount);
+            Memory::DestructItems(from.Get(), fromCount);
+            from.Free();
+        }
+    }
+}