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by cross_wiber
2620 days ago
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The earliest one I know of is in the Emerald programming language. There is a brief description of the technique in http://www.emeraldprogramminglanguage.org/OOPSLA-86-paper.pd... from 1986. See http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.103... for more history and description of the implementation. From that paper: "The run-time system constructed an AbCon for each
<type, implementation> pair that it encountered. An object
reference consisted not of a single pointer, but of a pair of
pointers: a pointer to the object itself, and a pointer to the
appropriate AbCon". (Called an AbCon because it "mapped Abstract operations to Concrete implementations.) |
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