Abstract
Abstract We propose session-ocaml , a novel library for session-typed concurrent/distributed programming in OCaml. Our technique solely relies on parametric polymorphism, which can encode core session type structures with strong static guarantees. Our key ideas are: (1) polarised session types, which give an alternative formulation of duality enabling OCaml to automatically infer an appropriate session type in a session with a reasonable notational overhead; and (2) a parameterised monad with a data structure called ‘slots’ manipulated with lenses, which can statically enforce session linearity including delegations. We introduce a notational extension to enhance the session linearity for integrating the session types into the functional programming style. We show applications of session-ocaml to a travel agency use case and an SMTP protocol implementation. Furthermore, we evaluate the performance of on a number of benchmarks.
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