I am stumped as to why this code compiles with type hints, but does not compile without. There shouldn\'t be any instance ambiguities (there is one instance).
If I have an ADT with specified typeclass restricti开发者_StackOverflowons I still have to specify the same typeclass for each function using this data type. What the reason for this and how can I red
While I am learning Haskell, I noticed its type class, which is supposed to be a great invention that originated from Haskell.
Consider the following example: data Dot = Dot Double Double data Vector = Vector Double Double First, i would like to overload + operator for Vector addit开发者_运维技巧ion. If i wanted to overloa
I\'m stumped on this overlapping instances error message. Sorry this is a nontrivial project, but the error should be local to the type signatures.
This question already has answers here: Closed 11 year开发者_StackOverflow社区s ago. Possible Duplicate:
Suppose I\'m using the typeclass pattern in Scala.Here\'s how I make a class C part of the typeclass Foo:
I have some algebraic data types A, B, and C each implements the class: class Dog a where dog :: a -> Bool
I want to implement an arrow with an arr-member-function showing a different behavior for function arguments with different types, for instance arr (\\x -> (x,x)) should behave differently from arr
I\'m trying to create a \"hierarchy\" of algebraic type classes, as follows: class Semigroup a where (.*)开发者_如何学Go :: a -> a -> a