The Free On-line Dictionary of Computing (30 December 2018):
Basic Object System
(BOS) A C-callable library that implements the
notion of object and which uses Tcl as its interpreter
for interpreted methods (you can have "compiled" methods in
C, and mix compiled and interpreted methods in the same
object, plus lots more). You can subclass and mix in existing
objects using BOS to extend, among other things, the set of
tkwidgets. BOS is a class-free object system, also
called a prototype-based object system; it is modelled loosely
on the Self system from Stanford University.
Version 1.31 by Sean Levy .