Objects are stored in memory just as ordinary records with an extra field : a pointer to the Virtual Method Table (VMT). This field is stored first, and all fields in the object are stored in the order they are declared. This field is initialized by the call to the object's Constructor method.
If the object you defined has no virtual methods, then a nil is stored in the VMT pointer. This ensures that the size of objects is equal, whether they have virtual methods ore not.
The memory allocated looks as in table (5.1).
| Offset | What |
| +0 | Pointer to VMT. |
| +4 | Data. All fields in the order the've been declared. |
| ... |