unit FSABSTRACT; interface uses Device; type vfs_abstract = object private prev : ^vfs_abstract; next : ^vfs_abstract; dev : PDevice; public constructor init; destructor done; virtual; end; {vfs_abstract} implementation constructor vfs_abstract.init; begin next := NIL; prev := NIL; dev := NIL; end; destructor vfs_abstract.done; begin end; end.