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milessabin/gist:6448380

Created September 5, 2013 10:19
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gistfile1.txt
def as[B] = new AsAux[B].apply
class AsAux[B] {
def apply[C](implicit gen: Generic.Aux[B, C], ev: A =:= C): Codec[B] = Codec.xmap(this)(gen.from, gen.to(_))
}
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