New proposed text resolving issue 71 (Guarded expressions)#230
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ndw merged 1 commit intoqt4cg:masterfrom Nov 15, 2022
Merged
New proposed text resolving issue 71 (Guarded expressions)#230ndw merged 1 commit intoqt4cg:masterfrom
ndw merged 1 commit intoqt4cg:masterfrom
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ChristianGruen
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Nov 3, 2022
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ChristianGruen
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Clear approval. I wondered if it’s side-effects or side effects, but I’m the wrong person to judge.
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Accepted at meeting 011, 15 November 2022 |
ndw
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…ions New proposed text resolving issue 71 (Guarded expressions)
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The discussion on issue 71 was very wide-ranging and went off into a number of tangents. This PR attempts to resolve the issue initially raised (order of evaluation of predicates) in a general way by introducing the notion of guarded expressions. This also provides a proposed solution to the question of "short-cutting" and/or expressions - essentially, an optimiser can change the order of evaluation, but doing so must not introduce dynamic errors that would not occur in a short-cutted evaluation.