typeclass

相关标签：javascript jquery android 多少钱 iPhone

Lack of type inference results in failed compilation, no instance ambiguities

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).[详细]

2023-03-31 03:43 分类：问答
Why do I have to specify typeclass in function if it was declared in data definition?

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[详细]

2023-03-28 06:17 分类：问答
Java's Interface and Haskell's type class: differences and similarities?

While I am learning Haskell, I noticed its type class, which is supposed to be a great invention that originated from Haskell.[详细]

2023-03-25 04:04 分类：问答
Haskell - add typeclass?

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[详细]

2023-03-24 04:17 分类：问答
Help interpreting overlapping instances error message

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.[详细]

2023-03-23 02:40 分类：问答
Syntax of MonadState typeclass declaration [duplicate]

This question already has answers here: Closed 11 year开发者_StackOverflow社区s ago. Possible Duplicate:[详细]

2023-03-20 17:39 分类：问答
How can I combine the typeclass pattern with subtyping?

Suppose I\'m using the typeclass pattern in Scala.Here\'s how I make a class C part of the typeclass Foo:[详细]

2023-03-20 14:28 分类：问答
Haskell typeclasses with algebraic data types

I have some algebraic data types A, B, and C each implements the class: class Dog a where dog :: a -> Bool[详细]

2023-03-19 23:55 分类：问答
GHC chooses different instances for the same expression?

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[详细]

2023-03-19 18:40 分类：问答
Semigroup/Monoid/Group type class hierarchy in Haskell errors

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[详细]

2023-03-19 17:45 分类：问答