R++ is a programming language created in 1990.
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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. Read more on Wikipedia...