jorgeortiz85’s gists

jorgeortiz85 / unsafe.scala

Created August 12, 2011 15:41

The bug from hell

	// This code is unsafe to use in a multithreaded environment.

	object A {
	def foo = "foo"
	B.bar
	}

	object B {
	def bar = "bar"
	A.foo

jorgeortiz85 / please_typecheck.scala

Created July 22, 2011 16:40 — forked from dt/please_typecheck.scala

I want line 15 to typecheck

	package demo

	trait Bar

	abstract class Foo[T] {}

	object Foo {
	implicit def FooFromBar[T <: Bar : Manifest]: Foo[T] = new Foo[T] { }
	def apply[T : Foo] = implicitly[Foo[T]]
	def baz[T : Foo](arg: T): Unit = { println("ha!")}

jorgeortiz85 / FoldUnion.scala

Created June 9, 2011 17:11

Folding over Scala union types

	type ¬[A] = A => Nothing
	type ∨[T, U] = ¬[¬[T] with ¬[U]]
	type ¬¬[A] = ¬[¬[A]]
	type \|∨\|[T, U] = { type λ[X] = ¬¬[X] <:< (T ∨ U) }

	class FoldUnion[T](t: T) {
	def boxClass(x: java.lang.Class[_]): java.lang.Class[_] = x.toString match {
	case "byte" => manifest[java.lang.Byte].erasure
	case "char" => manifest[java.lang.Character].erasure
	case "short" => manifest[java.lang.Short].erasure

jorgeortiz85 / gist:998174

Created May 29, 2011 22:16 — forked from lehrblogger/gist:998169

	import sbt._

	class LiftProject(info: ProjectInfo) extends DefaultWebProject(info) {
	val liftVersion = "2.3"

	val liftWebkit = "net.liftweb" %% "lift-webkit" % liftVersion % "compile"
	val liftMapper = "net.liftweb" %% "lift-mapper" % liftVersion % "compile"
	val jetty = "org.mortbay.jetty" % "jetty" % "6.1.22" % "test"
	val junit = "junit" % "junit" % "4.5" % "test"
	val logback = "ch.qos.logback" % "logback-classic" % "0.9.26"

jorgeortiz85 / MongoDynamic.scala

Created May 17, 2011 06:01

Proof-of-concept MongoDynamic

	import com.mongodb._
	import org.bson.types.ObjectId

	trait MongoDynamic extends Dynamic {
	def applyDynamic(name: String)(args: Any*): MongoDynamic
	def expand[A : Manifest]: Option[A]
	}

	object EmptyMongoDynamic extends MongoDynamic {
	override def applyDynamic(name: String)(args: Any*): MongoDynamic = EmptyMongoDynamic

jorgeortiz85 / PrivateMethodCaller.scala

Created April 7, 2011 15:41

Calling private methods in Scala

	// Usage:
	// p(instance)('privateMethod)(arg1, arg2, arg3)

	class PrivateMethodCaller(x: AnyRef, methodName: String) {
	def apply(_args: Any*): Any = {
	val args = _args.map(_.asInstanceOf[AnyRef])
	def _parents: Stream[Class[_]] = Stream(x.getClass) #::: _parents.map(_.getSuperclass)
	val parents = _parents.takeWhile(_ != null).toList
	val methods = parents.flatMap(_.getDeclaredMethods)
	val method = methods.find(_.getName == methodName).getOrElse(throw new IllegalArgumentException("Method " + methodName + " not found"))

jorgeortiz85 / gist:906503

Created April 6, 2011 20:52

Scala for-comprehensions

	// The way Scala for-comprehensions work is that:

	for (x <- c) f(x)

	// simply translates to:

	c.foreach(x => f(x))

	// Likewise:

jorgeortiz85 / gist:831166

Created February 17, 2011 06:44 — forked from dcbriccetti/gist:831162

	object AuthenticatedSession extends Loggable {
	def logIn(credentialsOption: Option[Credentials]): Twitter = {
	val (tw, credentials) = credentialsOption match {
	case Some(cr) =>
	(createTwitter(Some(cr)), cr)
	case None =>
	val twitter = createTwitter(None)
	val requestToken = twitter.getOAuthRequestToken
	DesktopUtil.browse(requestToken.getAuthorizationURL)
	(twitter, Dialog.showInput(null, "Enter the PIN from the Twitter authorization page in your browser",

jorgeortiz85 / DynamicImpl.scala

Created January 17, 2011 20:16

Method calls & XML traversal with Scala's new Dynamic type

	class DynamicImpl(x: AnyRef) extends Dynamic {
	def _select_(name: String): DynamicImpl = {
	new DynamicImpl(x.getClass.getMethod(name).invoke(x))
	}
	def _invoke_(name: String)(args: Any*) = {
	new DynamicImpl(x.getClass.getMethod(name, args.map(_.asInstanceOf[AnyRef].getClass) : _).invoke(x, args.map(_.asInstanceOf[AnyRef]) : _))
	}
	override def typed[T] = x.asInstanceOf[T]
	override def toString = "Dynamic(" + x.toString + ")"
	}

jorgeortiz85 / gist:477368

Created July 15, 2010 19:07

Jorge Ortiz jorgeortiz85