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Implement extract on Cofree.

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This commit is contained in:
Rob Rix 2015-10-14 09:43:23 -04:00
parent a83f77116d
commit 0d662ade08
1 changed files with 12 additions and 0 deletions
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12
prototype/Doubt/Cofree.swift
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@ -3,3 +3,15 @@
public enum Cofree<B> {
case Unroll(B)
}
// MARK: - Comonad
extension Cofree {
var extract: B {
switch self {
case let .Unroll(b):
return b
}
}
}