On Jul 19, 2009, at 04:13 , Ivan Lazar Miljenovic wrote:
1. Some Attribute values take something like (Either Bool String); this is used when upstream indicates that two different types of values are allowed. Typically in this kind of situation, the allowed String values are limited to a few specific values, so the usage of Either typically indicates that they should be replaced with a custom value type.
Shouldn't String then be replaced by a sum type? In fact, as described this would subsume the Either as well.
-- replace Either Bool String: AttrN are the strings, AltValue the bool data upstreamValue = AttrA | AttrB | AltValue
-- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery@kf8nh.com system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu electrical and computer engineering, carnegie mellon university KF8NH