Thanks, I'll check out Data and Typeable
--- On Thu, 10/1/09, Brandon S. Allbery KF8NH wrote:
From: Brandon S. Allbery KF8NH
Subject: Re: [Haskell-cafe] Introspection on types.
To: "Gregory Propf"
Cc: "Brandon S. Allbery KF8NH" , "Haskell-Cafe"
Date: Thu
On Oct 1, 2009, at 19:22 , Gregory Propf wrote:
Is there a way to tell, let's say, how many constructors there are
for a type? Or do I need one of the haskell extensions I've read
about?
If the constructors are nullary (that is: data MyData = Foo | Bar |
Baz) you could derive Enum and B
On Thu, Oct 1, 2009 at 6:22 PM, Gregory Propf wrote:
>
> Is there a way to tell, let's say, how many constructors there are for a
> type? Or do I need one of the haskell extensions I've read about?
Use Data.Data and derive Data for the types you are interested in or
instance it for pre-existing
Is there a way to tell, let's say, how many constructors there are for a type?
Or do I need one of the haskell extensions I've read about?
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