Yosuke Mizutani mogproject
daithiocrualaoich
/ gist:1189097
Created
September 2, 2011 16:37
Scala Collections Pimp to add distinctBy(hash: ... => ...) for hash filterings
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| implicit def seq2Distinct[T, C[T] <: Seq[T]](tees: C[T]) = new { | |
| import collection.generic.CanBuildFrom | |
| import collection.mutable.{HashSet => MutableHashSet} | |
| def distinctBy[S](hash: T => S)(implicit cbf: CanBuildFrom[C[T],T,C[T]]): C[T] = { | |
| val builder = cbf() | |
| val seen = MutableHashSet[S]() | |
| for (t <- tees) { | |
| if (!seen(hash(t))) { |
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