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• scodec-core_2.13.0-M5
• 1.11.2
• source code
• ProvideCodec.scala

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scodec.codecs.ProvideCodec.scala Maven / Gradle / Ivy

package scodec
package codecs

import scodec.bits.BitVector

/**
 * Codec that provides a constant value from decode and ignores the value to encode.
 *
 * Useful as a combinator with [[DiscriminatorCodec]].
 */
private[codecs] final class ProvideCodec[A](value: A) extends Codec[A] {
  override def sizeBound = SizeBound.exact(0)
  override def encode(a: A) = Attempt.successful(BitVector.empty)
  override def decode(bv: BitVector) = Attempt.successful(DecodeResult(value, bv))
  override def toString = s"provide($value)"
}