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| Content Provider | ACM Digital Library |
|---|---|
| Author | Blume, Matthias McAllester, David |
| Abstract | Even in statically typed languages it is useful to have certain invariants checked dynamically. Findler and Felleisen gave an algorithm for dynamically checking expressive higher-order types called contracts. If we postulate soundness (in the sense that whenever a term is accused of violating its contract it really does fail to satisfy it), then their algorithm implies a semantics for contracts. Unfortunately, the implicit nature of the resulting model makes it rather unwieldy.In this paper we demonstrate that a direct approach yields essentially the same semantics without having to refer to contract-checking in its definition. The so-defined model largely coincides with intuition, but it does expose some peculiarities in its interpretation of predicate contracts where a notion of safety (which we define in the paper) "leaks" into the semantics of Findler and Felleisen's original unrestricted predicate contracts.This counter-intuitive aspect of the semantics can be avoided by changing the language, replacing unrestricted predicate contracts with a restricted version. The corresponding loss in expressive power can be recovered by also providing a way of explicitly expressing safety as a contract-either in ad-hoc fashion or, e.g., by including general recursive contracts. |
| Starting Page | 189 |
| Ending Page | 200 |
| Page Count | 12 |
| File Format | |
| ISSN | 03621340 15581160 |
| DOI | 10.1145/1016848.1016876 |
| Journal | ACM SIGPLAN Notices (SIGP) |
| Volume Number | 39 |
| Issue Number | 9 |
| Language | English |
| Publisher | Association for Computing Machinery (ACM) |
| Publisher Date | 1983-05-01 |
| Publisher Place | New York |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Safety Predicates Contracts |
| Content Type | Text |
| Resource Type | Article |
| Subject | Computer Graphics and Computer-Aided Design Software |
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