[Haskell-beginners] accessor function scope

[Brandon S. Allbery KF8NH]

On 2009 Apr 7, at 9:15, Daniel Fischer wrote:
> Yes, they're called algebraic datatypes, but I'm not sure if a type  
> must have
> more than one constructor to qualify as such.

An ADT is any type expressible by a combination of sum and product  
types, IIRC.  Single constructor types are product types, multiple  
constructors are sums of product types.  (Note that this leaves out  
"data Nil"; that's why it's an extension.  "data Nil = Nil" is  
vacuously an ADT.)

-- 
brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery at kf8nh.com
system administrator [openafs,heimdal,too many hats] allbery at ece.cmu.edu
electrical and computer engineering, carnegie mellon university    KF8NH


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