LSUG Macro from Feb'13 dojo

lsug-dojo-feb13

package lsug

import scala.language.experimental.macros
import scala.reflect.macros.Context


object Debug {
  def error(s:String) = macro error_impl

  def error_impl(c: Context)(s: c.Expr[String]): c.Expr[Unit] = {
    import c.universe._

    val debug = System.getProperty("BOB", "false")

    val x = if(debug.equals("true")) reify(println("ERR: " + s.splice)).tree   else reify(println("")).tree
    println(x)

    c.Expr[Unit](Block(x))
  }
}


------

package lsug

object Main extends App {
    println( "Hello")

    Debug.error("This is an error" )

    println("End ")
}

import c.universe._ .... was missing this, without import universe from context... no cheeze!

https://bitbucket.org/sentimental/lsug_macros