retronym

class A
class A2 extends A
class B

trait M[X]

//
// Upper Type Bound
//
def upperTypeBound[AA <: A](x: AA): A = x

jboner

{
    "cmd": ["sbt-no-color compile"],
    "file_regex": "^\\[error\\] ([.a-zA-Z0-9/-]+[.]scala):([0-9]+):",
    "selector": "source.scala",
    "working_dir": "${project_path:${folder}}",
    "shell": "true"
}

milessabin

object Tuples {
  import HLists._

  implicit def tuple1ToHList[A](t : Product1[A]) = new { def hlisted : A :: HNil = t._1 :: HNil }
  implicit def tuple2ToHList[A, B](t : Product2[A, B]) = new { def hlisted : A :: B :: HNil = t._1 :: t._2 :: HNil }
  implicit def tuple3ToHList[A, B, C](t : Product3[A, B, C]) = new { def hlisted : A :: B :: C :: HNil = t._1 :: t._2 :: t._3 :: HNil }

  implicit def hListToTuple1[A](h : A :: HNil) = new { def tupled : Tuple1[A] = Tuple1(h.head) }
  implicit def hListToTuple2[A, B](h : A :: B :: HNil) = new { def tupled : (A, B) = (h.head, h.tail.head) }
  implicit def hListToTuple3[A, B, C](h : A :: B :: C :: HNil) = new { def tupled : (A, B, C) = (h.head, h.tail.head, h.tail.tail.head) }

dcsobral

{
    "cmd": ["sbt-no-color test"],
    "file_regex": "^\\[error\\] ([.a-z_A-Z0-9/-]+[.]scala):([0-9]+):",
    "selector": "source.scala",
    "working_dir": "${project_path:${folder}}",
    "shell": "true"
}

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

xeno-by

import scala.reflect.makro.Context

object Macros {
  def trace[A](expr: A) = macro traceImpl[A]

  def traceImpl[A: c.TypeTag](c: Context)(expr: c.Expr[A]): c.Expr[A] = {
    import c.universe._

    // stand-in for the real type of the traced sub expression.
    // This lets us conveniently splice this type into the

tonymorris

case class ListZipper[+A](lefts: List[A], x: A, rights: List[A]) {
  def map[B](f: A => B): ListZipper[B] =
    sys.error("todo")

  // map with zipper context
  def coFlatMap[B](f: ListZipper[A] => B): ListZipper[B] =
    sys.error("todo")

  def findRight(p: A => Boolean): Option[ListZipper[A]] =
    sys.error("todo")

xeno-by

19:07 ~/Projects/Kepler_typemacros/sandbox (topic/typemacros)$ scalac Macros.scala
19:07 ~/Projects/Kepler_typemacros/sandbox (topic/typemacros)$ scala -cp .
Welcome to Scala version 2.10.1-20121120-175733-b60f5bcf2c (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_37).
Type in expressions to have them evaluated.
Type :help for more information.

scala> class C extends AnyRef with Macros.Foo[Int]("2")
defined class C

scala> new C().hello

paulp

/** Constructing "singleton types" from compile-time literals
  *
  * val x = Example.foo(42)
  * val y: x.T = 42 // compiles
  * val z: x.T = 43 // doesn't
  *
  */
package s

import scala.language.experimental.macros

ymasory

Please help compile a list of all Scala-related IRC rooms.

All of these channels are on Freenode.

#akka              | concurrency & distribution framework
#argonaut          | json library
#fp-in-scala       | the book Functional Programming in Scala
#geotrellis        | geoprocessing library
#indyscala         | regional scala group
#json4s            | json library