seraphr

val dockerPublish = taskKey[Unit]("ダミーのタスク。本来sbt-native-packagerのやつ")
lazy val commonSettings = Def.settings(
  dockerPublish := {
    import java.time.LocalTime

    println(s"${LocalTime.now()} ${name.value} のpublish開始")
    // 並列で実行されるのがわかりやすいように、途中sleepする
    Thread.sleep(3000)
    println(s"${LocalTime.now()} ${name.value} のpublish終了")
  }

seraphr

> scala -Xlog-implicits
Welcome to Scala 2.12.6 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_172).
Type in expressions for evaluation. Or try :help.

scala> object A {
     |   import scala.language.implicitConversions
     |   implicit val int: Int = 1
     |   def a[A]: A = ???
     |   implicit def asString[A](implicit i: Int): Long => A = _ => a[A]
     |

seraphr

scala> class Hoge {
     |   def m1: this.type = this // OK
     |   def m2: this.type = new Hoge // NG
     | }
<console>:9: error: type mismatch;
 found   : Hoge
 required: Hoge.this.type
         def m2: this.type = new Hoge // NG

seraphr

2017/06/08 06:49
ブックマーク数100以上
連載中
文字数10万文字以上

all novel count = 30060
unique novel count = 12320
filtered novel count = 2759

順位	URL	文字数	ポイント評価	ブックマーク数	(ポイント評価 / ブックマーク数)	title	keyword

seraphr

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

/**
 */
object MethodsMacro {
  def apply[T]: Seq[String] = macro genMethods[T]

  def genMethods[T: c.WeakTypeTag](c: Context): c.Tree = {

seraphr

import upickle.{Js, Api}

trait UseUpickle {
  val mJsonApi: upickle.Api

  def write[T: mJsonApi.Writer](a: T): String = mJsonApi.write(a)
  def writeHoge(aHoge: Hoge): String = {
    import mJsonApi._
    mJsonApi.write(aHoge)

seraphr

trait Hoge{def hoge: String}
def h(a: Hoge) = a.hoge

val hogeInstance: Hoge = new Hoge{def hoge = "hoge"}
val hogeLikeInstance: {def hoge: String} = new {def hoge = "fuga"}

h(hogeInstance) // OK
h(hogeLikeInstance) // NG

seraphr

Generics使って実装したGraph

TypeMember版 https://gist.github.com/seraphr/6858219

seraphr

TypeMember使って実装したGraph

generics版 https://gist.github.com/seraphr/6858351

seraphr

// Implicitを上に書くとコンパイルできる

object Implicits {
  implicit val v = 10
}

object ImplicitTest {
  import Implicits._

  def main(args: Array[String]): Unit = {