Is it possible to determine the arity of a value's constructor?
Suppose I have a value x of type
data A = B Int | C
They typeOf function returns its TypeRep, which contains its type
constructor, but I don't see how to decide whether that
constructor's arity is 0 or 1. If the type has field
Hey David,
For instance:
arity :: (Data a) = a - Int
arity = length . gmapQ (const ())
Cheers,
Pedro
On Thu, Jun 25, 2009 at 17:31, David Fox dds...@gmail.com wrote:
Is it possible to determine the arity of a value's constructor?
Suppose I have a value x of type
data A = B Int | C
Oh, that make sense!
2009/6/25 José Pedro Magalhães j...@cs.uu.nl
Hey David,
For instance:
arity :: (Data a) = a - Int
arity = length . gmapQ (const ())
Cheers,
Pedro
On Thu, Jun 25, 2009 at 17:31, David Fox dds...@gmail.com wrote:
Is it possible to determine the arity of a
