The Common Lisp Object System (CLOS) is the facility for object-oriented programming which is part of ANSI Common Lisp. CLOS is a dynamic object system which differs radically from the OOP facilities found in more static languages such as C++ or Java. CLOS was inspired by earlier Lisp object systems such as MIT Flavors and CommonLOOPS, although it is more general than either. Originally proposed as an add-on, CLOS was adopted as part of the ANSI ...
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The Common Lisp Object System (CLOS) is the facility for object-oriented programming which is part of ANSI Common Lisp. CLOS is a dynamic object system which differs radically from the OOP facilities found in more static languages such as C++ or Java. CLOS was inspired by earlier Lisp object systems such as MIT Flavors and CommonLOOPS, although it is more general than either. Originally proposed as an add-on, CLOS was adopted as part of the ANSI standard for Common Lisp and has been adapted into other Lisp dialects like EuLisp or Emacs Lisp.
The basic building blocks of CLOS are classes, instances of classes, generic functions and their methods. CLOS provides macros to define those: DEFCLASS, DEFGENERIC and DEFMETHOD. Instances are created with the function MAKE-INSTANCE.
Classes can have multiple superclasses, a list of slots (member variables in C++/Java parlance) and a special meta class. Slots can be allocated by class (all instances of a class are sharing the slot) or by instance...
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