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Advanced Software Science and Computation Structures

$87,99 per month

SUBSCRIPTION FOR 4 weeks, 2 days


Course Overview.

We explore type systems and programming abstractions for the safe usage of resources. In particular, we investigate how to use types to modularly specify and check when programs are allowed to use their resources, e.g., when programming a robot arm on a production line, it is crucial that painted parts are given enough time to dry before assem- bly. We capture such temporal resources using a time-graded variant of Fitch-style modal type systems, develop a corresponding modally typed, effectful core calculus, and equip it with a graded-monadic denotational semantics illustrated by a concrete presheaf model. Our calculus also in- cludes graded algebraic effects and effect handlers. They are given a novel temporally aware treatment in which operations’ specifications include their execution times and their continuations know that an operation’s worth of additional time has passed before they start executing, making it possible to safely access further temporal resources in them.


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