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Consider codecs of union types #303

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mpilquist opened this issue Feb 27, 2021 · 0 comments

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mpilquist commented Feb 27, 2021 •

edited

// On Codec[A]:
  final def |[B](that: Codec[B])(using reflect.Typeable[A], reflect.Typeable[B]): Codec[A | B] = new Codec[A | B]:
    def sizeBound = sizeBound | that.sizeBound
    def encode(ab: A | B) = ab match
      case a: A => self.encode(a)
      case b: B => that.encode(b)
    def decode(bv: BitVector) =
      self.decode(bv).orElse(that.decode(bv))

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