Some algorithms make critical internal use of updatable state, even though their external specification is purely functional. Based on earlier work on monads, we present a way of securely encapsulating stateful computations that manipulate multiple, named, mutable objects, in the context of a nonstrict, purely functional language. The security of the encapsulation is assured by the type system, using parametricity. The same framework is also used to handle input\/output operations (state changes on the external world) and calls to C.<\/p>\n","protected":false},"excerpt":{"rendered":"
Some algorithms make critical internal use of updatable state, even though their external specification is purely functional. Based on earlier work on monads, we present a way of securely encapsulating stateful computations that manipulate multiple, named, mutable objects, in the context of a nonstrict, purely functional language. 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