R++

R++ is a rule-based programming language based on C++. The United States patent describes R++ as follows:

The R++ extension permits rules to be defined as members of C++ classes. The programming system of the invention takes the classes with rules defined using R++ and generates C++ code from them in which the machinery required for the rules is implemented completely as C++ data members and functions of the classes involved in the rules.[1]

R++ was developed by Bell Labs in the 1990s, but due to the Bell System divestiture that split the legal rights to the work developed at the Laboratories between AT&T and Lucent, did not see immediate commercial development while the two companies disputed ownership.[2]

References
  1. US 5768480 "Integrating rules into object-oriented programming systems"
  2. Karyl Scott (October 9, 2000). "Fancy Footwork". InformationWeek. Retrieved 2007-01-21.
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