On Wed, Jan 16, 2013 at 11:22 PM, Thiago Negri wrote:
> The C spec allows the use of GLboolean values where GLenums are expected.
>
Some fixes off the top of my head (caveats apply):
* define a lift :: GLboolean -> GLenum
* use a typeclass GLenumlike
* if there aren't too many of them, roll a G
Thanks for the answer, but I'm trying to avoid type classes.
By the way, I'm not trying to embed OO into Haskell.
I'm trying to solve this issue:
https://github.com/haskell-opengl/OpenGLRaw/issues/15
The binding to OpenGL declares GLenum as CUInt and GLboolean as CUChar,
meaning I can't use a GLe
For your particular constraints, it can be as easy as:
class IsA a where
toA :: a -> A
foo' :: IsA a => a -> C
foo' = foo . toA
However, you may asking the wrong question since it smells like you're
trying to embed OO into Haskell =).
Cheers,
On Wed, Jan 16, 2013 at 1:03 PM, Thiago N
Hello.
How do I achieve type hierarchy in Haskell?
Suppose we have the following code:
foo :: A -> C
bar :: B -> C
I want something that allow me to say that B is a subtype of A, meaning:
1. I can use a value of type A where a value of type A is needed.
2. I can use a value of type B where a va
