Scala example source code file (SimpleTracer.scala)

This example Scala source code file (SimpleTracer.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

boolean, compiler, nsc, printstream, simpletracer, string, t

The SimpleTracer.scala Scala example source code

package scala.tools.nsc
package util

// todo: We should unify this with Tracer. I'd do it but Tracer is
// too complicated for me to understand quickly.
import java.io.PrintStream

/** A simple tracer
 *  @param out: The print stream where trace info should be sent
 *  @param enabled: A condition that must be true for trace info to be produced.
 */
class SimpleTracer(out: PrintStream, enabled: Boolean = true) {
  def apply[T](msg: => String)(value: T): T = {
    if (enabled) out.println(msg+value)
    value
  }
  def when(enabled: Boolean): SimpleTracer = new SimpleTracer(out, enabled)
}