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Scope structures and defined functions in Lucid
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Ashcroft, Edward A. and Wadge, William W. (1977) Scope structures and defined functions in Lucid. University of Warwick. Department of Computer Science. (Theory of Computation Report). (Unpublished)
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Abstract
In the paper we describe how Lucid can be extended to allow user-defined functions and scope conventions, i.e. conventions or limiting the range or scope of the validity of definitions. The new 1constructs added (they are called clauses) are similar in form to the blocks and procedure declarations of A1go1-like languages, but are nevertheless strictly non-imperative, because a clause is actually a compound assertion, i.e. an assertion formed aS d program is, by combining a collection of assertions. Each type of clause (there are four) has a straightforward mathematical semantics together with its own characteristic "manipulation
rules" for general program massage. In addition, the informal operational view of (some) Lucid programs (described in a previous paper) can be extended to give an (incomplete) operational understanding of the effect of the clauses. In this framework a "compute" clause defines a block; a "mapping clause" defines a conventional (pointwise) function; a "produce" clause defines a block with persistent memory (an anonymous processor 'actor'); and a "function" clause defines a general kind of coroutine.
| Item Type: | Report | ||||
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| Subjects: | Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Computer Science | ||||
| Library of Congress Subject Headings (LCSH): | Lucid (Computer program language) | ||||
| Series Name: | Theory of Computation Report | ||||
| Publisher: | University of Warwick. Department of Computer Science | ||||
| Official Date: | October 1977 | ||||
| Dates: |
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| Number: | Number 21 | ||||
| Number of Pages: | 41 | ||||
| DOI: | CS-RR-021 | ||||
| Institution: | University of Warwick | ||||
| Theses Department: | Department of Computer Science | ||||
| Status: | Not Peer Reviewed | ||||
| Publication Status: | Unpublished | ||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||
| Date of first compliant deposit: | 1 August 2016 | ||||
| Date of first compliant Open Access: | 1 August 2016 |
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