type-inference

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Is it possible to place inequality constraints on haskell type variables?

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?[详细]

2023-03-25 15:47 分类：问答
How can I improve Scala's type inference with type parameters that don't show up in the first parameter list?

To illustrate my point, here an example: abstract class Wrapper[A](wrapped: A) { protected def someCondition: Boolean[详细]

2023-03-25 07:16 分类：问答
How to hint type inference when using static imports?

I am using junit with hamcrest in my unit tests and I came acro开发者_如何学Css a generics problem:[详细]

2023-03-24 04:43 分类：问答
The relationship between auto and decltype

Is auto x = initializer; equivalent 开发者_JAVA技巧to decltype(initializer) x = initializer; or decltype((initializer)) x = initializer;[详细]

2023-03-23 22:37 分类：问答
Type inferred to Nothing in Scala

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] {[详细]

2023-03-23 21:33 分类：问答
Hindley-Milner algorithm in Java

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[详细]

2023-03-21 22:40 分类：问答
Parametric polymorphism vs Ad-hoc polymorphism

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[详细]

2023-03-21 13:14 分类：问答
Difference in Javascript validation between Eclipse Helios and Eclipse Indigo

I\'ve been experimenting with JSDT. Under Indigo, the validation has stopped complaining about unknown fields of objects. In Helios, it does.[详细]

2023-03-21 03:19 分类：问答
Yet Another Value Restriction Question

In the following code Seq.generateUnique is constrained to be of type ((Assembly -> seq<Assembly>) -> seq<Assembly> -> seq<Assembly>).[详细]

2023-03-18 22:05 分类：问答
Scala String vs java.lang.String - type inference

In the REPL, I define a function. Note the return type. scala> def next(i: List[String]) =i.map {\"0\" + _} ::: i.reverse.map {\"1\" + _}[详细]

2023-03-17 02:42 分类：问答