Actor (programming language)

Short description: Programming language

The Actor programming language was invented by Charles Duff of The Whitewater Group in 1988. It was an offshoot of some object-oriented extensions to the Forth language he had been working on.[1]

Actor is a pure object-oriented language in the style of Smalltalk. Like Smalltalk, everything is an object, including small integers. A Baker semi-space garbage collector is used, along with (in memory-constrained Windows 2.1 days) a software virtual memory system that swaps objects. A token threaded interpreter,[2] written in 16-bit x86 assembly language, executes compiled code.

Actor only was released for Microsoft Windows 2.1 and 3.0. Actor used a pure object-oriented framework over native operating system calls as its basic GUI architecture. This allows an Actor application to look and feel exactly like a Windows application written in C, but with all the advantages of an interactive Smalltalk-like development environment. Both a downside and upside to this architecture is a tight coupling to the Windows architecture, with a thin abstraction layer into objects. This allows direct use of the rich Windows OS API, but also makes it nearly impossible to support any other OS without a significant rewrite of the application framework.

A demo of Actor was shown in an episode of Computer Chronicles.[3]

## Further reading

* [4]

## References

1. ↑ Ziff Davis Inc (1991-03-26) (in en). PC Mag. Ziff Davis, Inc.. https://books.google.com/books?id=f7GkbOJrVekC&dq=charles+duff+actor+programming&pg=PT346.
2. ↑ InfoWorld Media Group (1991-02-25) (in en). InfoWorld. InfoWorld Media Group, Inc.. https://books.google.com/books?id=X1AEAAAAMBAJ&q=Whitewater+Group+actor&pg=PA45.
3. ↑ Computer Chronicles. Episode 718. Programming Languages, 1990-03-01, http://archive.org/details/programming_2, retrieved 2022-07-10
4. ↑ Don Crabs (15 October 1990). "Actor offers a sophisticated OOP development system". InfoWorld (InfoWorld Media Group, Inc.): 86–. ISSN 0199-6649. https://books.google.com/books?id=LjwEAAAAMBAJ&pg=PT86. Retrieved 18 August 2011.

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