For_class_not_object

Use companion object, add empty companion object if you don't have one in your class.

Follow the code example:

interface OutFactory {
  /**
   * Empty companion object is added to provide a hook-up for writing extension
   * methods on the OutFactory 'class'.
   *
   * Typical extension methods will work on instance, of a class/interface
   * This will allow creation of extension methods for a class. */
  companion object

fun OutFactory.Companion.consoleFactory(): OutFactory {
  return object : OutFactory {
    override fun getOutForClass(classHoldingOut: KClass<*>): Out {
      // Return a console-specific Out implementation
      return SimpleConsoleOut(
        classHoldingOut,
        shouldIncludeElapsedTime = true,
        logLevelProvider = LogLevelProvider.LOG_ALWAYS
      )
    }
  }
}

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Backlinks

• Extension Methods