[Haskell-cafe] How can I parameterize the Candidate?
duane.johnson at gmail.com
Sun Mar 28 22:13:47 EDT 2010
How can I parameterize the type of the following data class so that
any type can be a Candidate?
type Candidate = String
data Poll = Poll [Candidate] [Ballot]
My initial thought was to simply put a type variable in place of
Candidate, but that clearly won't work:
data Poll = Poll [a] [Ballot]
>> Not in scope: type variable `a'
For context: I am building a voting library that addresses the issue
of polarized American politics by implementing the Virtual Round Robin
electoral method with a Maximum Majority Voting algorithm for breaking
cycles. The beginnings of the library are available at http://github.com/canadaduane/votelib/blob/master/vote.hs
What is a good approach to the parameterized type issue? Thank you,
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Haskell-Cafe