Is it possible to place an inequality constraint on the typevariables of a function, à la foo :: (a ~ b) => a -> b as in GHC type family docs, except inequality rather than equality?
To illustrate my point, here an example: abstract class Wrapper[A](wrapped: A) { protected def someCondition: Boolean
I am using junit with hamcrest in my unit tests and I came acro开发者_如何学Css a generics problem:
Is auto x = initializer; equivalent 开发者_JAVA技巧to decltype(initializer) x = initializer; or decltype((initializer)) x = initializer;
When I try to compile the small example: trait Foo[A,B] { type F[_,_] def foo(): F[A,B] } class Bar[A,B] extends Foo[A,B] {
I\'m working on a simple dataflow based system (imagine it like a LabView editor/runtime) written in Java. The user can wire blocks together in an editor and I need type inference to ensure the datafl
I would like to understand the key difference between parametric polymorphism such as polymorphism of generic classes/functions in the Java/Scala/C++ languages and \"ad-hoc\" polymorphism in the Haske
I\'ve been experimenting with JSDT. Under Indigo, the validation has stopped complaining about unknown fields of objects. In Helios, it does.
In the following code Seq.generateUnique is constrained to be of type ((Assembly -> seq<Assembly>) -> seq<Assembly> -> seq<Assembly>).
In the REPL, I define a function. Note the return type. scala> def next(i: List[String]) =i.map {\"0\" + _} ::: i.reverse.map {\"1\" + _}
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