A (usually implicit) TypeMapper object represents a Scala type that can be used as a column type in the database. The actual implementation of the type is deferred to a TypeMapperDelegate which can depend on the driver.

Custom types with a single implementation can implement both traits in one object:

implicit object MyTypeMapper
    extends TypeMapper[MyType] with TypeMapperDelegate[MyType] {
  def apply(p:Profile) = this
  def zero = ...
  def sqlType = ...
  def setValue(v: Long, p: PositionedParameters) = ...
  def setOption(v: Option[Long], p: PositionedParameters) = ...
  def nextValue(r: PositionedResult) = ...
  def updateValue(v: Long, r: PositionedResult) = ...
}