Template:Object Types

Feature	Record	Adv Record	Object	Class
Encapsulation (combining data and methods + hiding visibility)	No	Yes	Yes	Yes
Inheritance	No	No	Yes	Yes
Class constructor and destructor	No	Yes	Yes	Yes
Polymorphism (virtual methods)	No	No	Yes	Yes
Memory allocation	Stack	Stack	Stack	Heap (Only)
Setting fields to zero on allocation	Managed Types only	Managed Types only	Managed Types only	All fields
Default() function returns a constant with	all fields zeros	all fields zeros	all fields zeros	returns nil
Operator overload (global)	Yes	Yes	Yes	Yes
Operator overload (in type only)	No	Yes	No	No
Type helpers	No	Yes	No	Yes
Virtual constructors, class reference	No	No	No	Yes
Variant part (case) as c/c++ union	Yes	Yes	No	No
Bitpacked (really packing)	Yes	Yes	No	No

Modified from https://forum.lazarus.freepascal.org/index.php/topic,30686.30.html (original author: ASerge).