• Source: Trellis-Owl

Trellis/Owl, or simply Owl, is a defunct object-oriented programming language created by Digital Equipment Corporation. It was part of a programming environment, Trellis. It ran on the OpenVMS operating system.
Trellis/Owl differed from contemporary languages in several ways. For one, it did not use dot notation for method calls on objects, and used a traditional functional style instead, which they referred to as operations. Operations were supported by the concept of a controlling object, the first parameter in the function call, which indicated which class was being referred to. Whereas most OO languages of the era might have a myStringVariableToPrint.print() method, in Trellis/Owl this would be print(myStringVariableToPrint), and the print method of the class String would be called based on a string being the first parameter. Trellis/Owl also supported properties, which they referred to as components. Trellis/Owl also included a system allowing the easy creation of iterators, using the yields keyword to replace returns in the definition of an operation. yields indicates the operator will return a series of values instead of one.




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References






= Citations

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= Bibliography

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Schaffert, Craig; Cooper, Topher; Bullis, Bruce; Kilian, Mike; Wilpolt, Carrie (1986). "An introduction to Trellis/Owl". Conference proceedings on Object-oriented programming systems, languages and applications - OOPSLA '86. pp. 9–16. doi:10.1145/28697.28699. ISBN 0897912047. S2CID 9565256.
Joseph, John; Thatte, Satish; Thompson, Craig; Wells, David (26 September 1988). "Report on the Object-Oriented Database Workshop" (PDF). SIGMOD Record. 18 (3): 78–101. doi:10.1145/71031.71041.
O'Brien, Patrick D.; Halbert, Daniel C.; Kilian, Michael F. (December 1987). "The Trellis programming environment". Conference proceedings on Object-oriented programming systems, languages and applications. ACM. pp. 91–102. doi:10.1145/38765.38815. ISBN 978-0-89791-247-1. S2CID 16084550.
Law, Rob (March 1997). "An overview of debugging tools". ACM SIGSOFT Software Engineering Notes. 22 (2): 43–47. doi:10.1145/251880.251926. ISSN 0163-5948. S2CID 17506126.

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