Fixed issue where the dereferencing function broke compilation on some compilers.

src/Memory/BorrowedPtr.hpp

@@ -30,8 +30,13 @@ namespace ArbUt {
             return _raw;
         }
         inline T operator*() const {
-            AssertNotNull(_raw);
-            return *_raw;
+            if constexpr (std::is_abstract<T>()){
+                static_assert(!std::is_abstract<T>(), "You're not allowed to dereference an abstract class.");
+            }
+            else{
+                AssertNotNull(_raw);
+                return *_raw;
+            }
         }
 
         inline T* GetRaw() const noexcept { return _raw; }