4/1/2024 0 Comments Duck typingThe Plugin typeclass exists to express containment of types within other types. The constructor function should NOT be polymorphic *at all*Īpply constructor f x = set (constructor $ run f x) x Instance (Plugin d b, Runnable e b c) => Runnable (d -> e) b c where Instance Plugin a b => Runnable (a -> c) b c where Instance (Plugin a b) => Plugin a (Addon c b)where Now in a structural type system we could assign foo a type foo : forall a b. It has a method quux which takes 1 integer argument.It has a method baz which takes no arguments.Now it's not clear what the type of bar is, but whatever it is we know However that type is based on the actual structure of the type rather than any particular type name.įor example, let's say we have the Python code def foo(bar): In structurally typed systems, things have a static type. The usual meaning of such a term is just structural typing.
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