higher-rank-types
Folding over a polymorphic list in Haskell
I have a collection of records spread across a number of types in a large Haskell application that reference each other. All of the types involved implement a common typeclass. The typeclass contains[详细]
2023-04-12 17:17 分类:问答List of existentially quantified values in Haskell
I\'m wondering why this piece of code doesn\'t type-check: {-# LANGUAGE ScopedTypeVariables, Rank2Types, RankNTypes #-}[详细]
2023-01-05 18:38 分类:问答How to draw polygons with CGPath?
I have been reading thru the documentation however it is not immediatly clear to me how to draw a polygon using CGPath. All I need to do is to draw CGPath around something like this:[详细]
2022-12-20 03:02 分类:问答