Simulacrum Example

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Example of using Simulacrum

build.sbt

scalaVersion := "2.11.7"

addCompilerPlugin("org.scalamacros" % "paradise" % "2.1.0-M5" cross CrossVersion.full)

libraryDependencies += "com.github.mpilquist" %% "simulacrum" % "0.4.0"

email.scala

import simulacrum._

trait EmailMessage
trait EmailDestination
case class SendEmail(destination: EmailDestination, message: EmailMessage)
case class EmailSent(messageId: Int)
trait EmailService { def sendEmail(e: SendEmail): { def getMessageId: Int } }

@typeclass trait Emailable[A] {
  def toEmailMessage(a: A): EmailMessage
}

object MyApp {

  val ses: EmailService = ???

  def sendEmail[T](destination: EmailDestination, message: T)(implicit emailable: Emailable[T]): EmailSent = {
    val email = SendEmail(destination, emailable.toEmailMessage(message))
    EmailSent(ses.sendEmail(email).getMessageId)
  }
}