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The Computer Journal 1983 26(1):72-78; doi:10.1093/comjnl/26.1.72
© 1983 by British Computer Society
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Co-expression in Icon*

S. B. Wample1 § and R. E. Griswold2

1 College of Engineering, Northern Arizona University, Flagstaff, USA, 2 Department of Computer Science, The University of Arizona, Tucson, USA

The Icon programming language has generators that are capable of producing sequences of results and a goal-directed evaluation mechanism that allows concise formulation of many kinds of computations. The evaluation of generators is restricted to their lexical site in a program, however. This paper describes co-expressions, an extension to Icon that allows generators to be used at any time or place in a program. Examples of co-expression usage are given and the relationship of co-expressions to coroutines is discussed.

Received April 1982.

* This work was supported by the National Science Foundation under Grants MCS79-03890 and MCS81-01916.

§ Department of Computer Science, The University of Arizona, Tucson, Arizona 85721, USA


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