Re: [Haskell-cafe] Re: What do _you_ want to see in FGL?

Heinrich Apfelmus writes:

Yes; what I mean is that you can retrofit a custom vertex type to any graph implementation that uses a fixed vertex type. So, let's say that

data Gr a b = .. -- graph with vertex type Vertex Gr = Int

then

type Gr' node a b = CustomVertex node Gr a b

data CustomVertex node gr a b = CV (gr a b) (Map node (Vertex gr))

is a graph with custom vertex type node .

Sounds like it's more complicated than it's worth tbh ;-) -- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com IvanMiljenovic.wordpress.com