Quintus Objects is another useful tool for Quintus Prolog

Quintus Objects

Quintus Objects brings the advantages of object-oriented programming to Quintus Prolog, the world's most powerful system for creating stand-alone and embeddable Prolog-based applications.

Quintus Objects allows Prolog programmers to write efficient object-oriented programs in Prolog. The objects are updateable data structures whose slots can contain Prolog terms. Or, for increased efficiency, a slot can be constrained to hold a specific C-style type. Because objects are updateable, they offer an efficient alternative to storing modifiable data in the Prolog database.

Features

• Updateable objects
• Classes with slots, messages and methods
• Term classes - using ordinary Prolog terms as objects
• Optional C-style types for slots
• Private and protected slots restrict access to data
• Direct slot access by fetch_slot/2 and store_slot/2
• Automatic creation of get and put methods
• Other methods defined by Prolog clauses
• Single and multiple inheritance, resolved at compile-time
• Class definitions and messages translated into Prolog code at compile-time

Benefits

• Convenient creation of efficient object-oriented programs, for Prolog programmers
• Updateable objects offer an alternative to storing data in the Prolog database

Requirements

• Quintus Prolog 3.2, or later, on any supported QP platform