predef.scala

来自「JAVA 语言的函数式编程扩展」· SCALA 代码 · 共 356 行 · 第 1/2 页

  implicit def byteWrapper(x: Byte)     = new runtime.RichByte(x)
  implicit def shortWrapper(x: Short)   = new runtime.RichShort(x)
  implicit def intWrapper(x: Int)       = new runtime.RichInt(x)
  implicit def charWrapper(c: Char)     = new runtime.RichChar(c)
  implicit def longWrapper(x: Long)     = new runtime.RichLong(x)
  implicit def floatWrapper(x: Float)   = new runtime.RichFloat(x)
  implicit def doubleWrapper(x: Double) = new runtime.RichDouble(x)

  implicit def booleanWrapper(x: Boolean)  = new runtime.RichBoolean(x)

  implicit def stringWrapper(x: String) = new runtime.RichString(x)
  implicit def stringBuilderWrapper(x : StringBuilder): runtime.RichStringBuilder = new runtime.RichStringBuilder(x)

  implicit def any2stringadd(x: Any) = new runtime.StringAdd(x)

  implicit def exceptionWrapper(exc: Throwable) = new runtime.RichException(exc)

  implicit def unit2ordered(x: Unit): Ordered[Unit] = new Ordered[Unit] with Proxy {
    def self: Any = x
    def compare(y: Unit): Int = 0
  }

  implicit def iterable2ordered[A <% Ordered[A]](xs: Iterable[A]): Ordered[Iterable[A]] =
    new Ordered[Iterable[A]] with Proxy {
      val self = xs
      def compare(that: Iterable[A]): Int = {
        var res = 0
        val these = xs.elements
        val those = that.elements
        while (res == 0 && these.hasNext)
          res = if (those.hasNext) these.next compare those.next else 1
        if (res == 0) {
          if (those.hasNext) -1 else 0
        } else 
          res
      }
    }

  implicit def tuple22ordered[A1 <% Ordered[A1], A2 <% Ordered[A2]](x: Tuple2[A1, A2]): Ordered[Tuple2[A1, A2]] = 
    new Ordered[Tuple2[A1, A2]] with Proxy {
      val self = x
      def compare(y: Tuple2[A1, A2]): Int = {
        val res = x._1 compare y._1
        if (res == 0) x._2 compare y._2
        else res
      }
    }

  implicit def tuple32ordered[A1 <% Ordered[A1], A2 <% Ordered[A2], A3 <% Ordered[A3]](x: Tuple3[A1, A2, A3]): Ordered[Tuple3[A1, A2, A3]] = 
    new Ordered[Tuple3[A1, A2, A3]] with Proxy {
      val self = x
      def compare(y: Tuple3[A1, A2, A3]): Int = {
        val res = x._1 compare y._1
        if (res == 0) Tuple2(x._2, x._3) compare Tuple2(y._2, y._3)
        else res
      }
    }

  implicit def tuple42ordered[A1 <% Ordered[A1], A2 <% Ordered[A2], A3 <% Ordered[A3], A4 <% Ordered[A4]](x: Tuple4[A1, A2, A3, A4]): Ordered[Tuple4[A1, A2, A3, A4]] = 
    new Ordered[Tuple4[A1, A2, A3, A4]] with Proxy {
      val self = x
      def compare(y: Tuple4[A1, A2, A3, A4]): Int = {
        val res = x._1 compare y._1
        if (res == 0) Tuple3(x._2, x._3, x._4) compare Tuple3(y._2, y._3, y._4)
        else res
      }
    }

  implicit def tuple52ordered[A1 <% Ordered[A1], A2 <% Ordered[A2], A3 <% Ordered[A3], A4 <% Ordered[A4], A5 <% Ordered[A5]](x: Tuple5[A1, A2, A3, A4, A5]): Ordered[Tuple5[A1, A2, A3, A4, A5]] = 
    new Ordered[Tuple5[A1, A2, A3, A4, A5]] with Proxy {
      val self = x
      def compare(y: Tuple5[A1, A2, A3, A4, A5]): Int = {
        val res = x._1 compare y._1
        if (res == 0) Tuple4(x._2, x._3, x._4, x._5) compare Tuple4(y._2, y._3, y._4, y._5)
        else res
      }
    }

  implicit def tuple62ordered[A1 <% Ordered[A1], A2 <% Ordered[A2], A3 <% Ordered[A3], A4 <% Ordered[A4], A5 <% Ordered[A5], A6 <% Ordered[A6]](x: Tuple6[A1, A2, A3, A4, A5, A6]): Ordered[Tuple6[A1, A2, A3, A4, A5, A6]] = 
    new Ordered[Tuple6[A1, A2, A3, A4, A5, A6]] with Proxy {
      val self = x
      def compare(y: Tuple6[A1, A2, A3, A4, A5, A6]): Int = {
        val res = x._1 compare y._1
        if (res == 0) Tuple5(x._2, x._3, x._4, x._5, x._6) compare Tuple5(y._2, y._3, y._4, y._5, y._6)
        else res
      }
    }

  implicit def tuple72ordered[A1 <% Ordered[A1], A2 <% Ordered[A2], A3 <% Ordered[A3], A4 <% Ordered[A4], A5 <% Ordered[A5], A6 <% Ordered[A6], A7 <% Ordered[A7]](x: Tuple7[A1, A2, A3, A4, A5, A6, A7]): Ordered[Tuple7[A1, A2, A3, A4, A5, A6, A7]] = 
    new Ordered[Tuple7[A1, A2, A3, A4, A5, A6, A7]] with Proxy {
      val self = x
      def compare(y: Tuple7[A1, A2, A3, A4, A5, A6, A7]): Int = {
        val res = x._1 compare y._1
        if (res == 0) Tuple6(x._2, x._3, x._4, x._5, x._6, x._7) compare Tuple6(y._2, y._3, y._4, y._5, y._6, y._7)
        else res
      }
    }

  implicit def tuple82ordered[A1 <% Ordered[A1], A2 <% Ordered[A2], A3 <% Ordered[A3], A4 <% Ordered[A4], A5 <% Ordered[A5], A6 <% Ordered[A6], A7 <% Ordered[A7], A8 <% Ordered[A8]](x: Tuple8[A1, A2, A3, A4, A5, A6, A7, A8]): Ordered[Tuple8[A1, A2, A3, A4, A5, A6, A7, A8]] = 
    new Ordered[Tuple8[A1, A2, A3, A4, A5, A6, A7, A8]] with Proxy {
      val self = x
      def compare(y: Tuple8[A1, A2, A3, A4, A5, A6, A7, A8]): Int = {
        val res = x._1 compare y._1
        if (res == 0) Tuple7(x._2, x._3, x._4, x._5, x._6, x._7, x._8) compare Tuple7(y._2, y._3, y._4, y._5, y._6, y._7, y._8)
        else res
      }
    }

  implicit def tuple92ordered[A1 <% Ordered[A1], A2 <% Ordered[A2], A3 <% Ordered[A3], A4 <% Ordered[A4], A5 <% Ordered[A5], A6 <% Ordered[A6], A7 <% Ordered[A7], A8 <% Ordered[A8], A9 <% Ordered[A9]](x: Tuple9[A1, A2, A3, A4, A5, A6, A7, A8, A9]): Ordered[Tuple9[A1, A2, A3, A4, A5, A6, A7, A8, A9]] = 
    new Ordered[Tuple9[A1, A2, A3, A4, A5, A6, A7, A8, A9]] with Proxy {
      val self = x
      def compare(y: Tuple9[A1, A2, A3, A4, A5, A6, A7, A8, A9]): Int = {
        val res = x._1 compare y._1
        if (res == 0) Tuple8(x._2, x._3, x._4, x._5, x._6, x._7, x._8, x._9) compare Tuple8(y._2, y._3, y._4, y._5, y._6, y._7, y._8, y._9)
        else res
      }
    }

  implicit def byte2short(x: Byte): Short = x.toShort
  implicit def byte2int(x: Byte): Int = x.toInt
  implicit def byte2long(x: Byte): Long = x.toLong
  implicit def byte2float(x: Byte): Float = x.toFloat
  implicit def byte2double(x: Byte): Double = x.toDouble

  implicit def short2int(x: Short): Int = x.toInt
  implicit def short2long(x: Short): Long = x.toLong
  implicit def short2float(x: Short): Float = x.toFloat
  implicit def short2double(x: Short): Double = x.toDouble

  implicit def char2int(x: Char): Int = x.toInt
  implicit def char2long(x: Char): Long = x.toLong
  implicit def char2float(x: Char): Float = x.toFloat
  implicit def char2double(x: Char): Double = x.toDouble

  implicit def int2long(x: Int): Long = x.toLong
  implicit def int2float(x: Int): Float = x.toFloat
  implicit def int2double(x: Int): Double = x.toDouble

  implicit def long2float(x: Long): Float = x.toFloat
  implicit def long2double(x: Long): Double = x.toDouble

  implicit def float2double(x: Float): Double = x.toDouble

  /** Should use java.lang.Byte.valueOf(Byte), but only available
   * in Java 1.5 and above. */
  implicit def byte2Byte(x: Byte) = new java.lang.Byte(x)
  /** Should use java.lang.Short.valueOf(Short), but only available
   * in Java 1.5 and above. */
  implicit def short2Short(x: Short) = new java.lang.Short(x)
  /** Should use java.lang.Character.valueOf(Char), but only available
   * in Java 1.5 and above. */
  implicit def char2Character(x: Char) = new java.lang.Character(x)
  /** Should use java.lang.Integer.valueOf(Int), but only available
   * in Java 1.5 and above. */
  implicit def int2Integer(x: Int) = new java.lang.Integer(x)
  /** Should use java.lang.Long.valueOf(Long), but only available
   * in Java 1.5 and above. */
  implicit def long2Long(x: Long) = new java.lang.Long(x)
  implicit def float2Float(x: Float) = new java.lang.Float(x)
  implicit def double2Double(x: Double) = new java.lang.Double(x)
  implicit def boolean2Boolean(x: Boolean) = java.lang.Boolean.valueOf(x)

  /** any array projection can be automatically converted into an array */
  implicit def forceArrayProjection[A](x: Array.Projection[A]): Array[A] = x.force
  /** any random access character seq (including rich string can be converted into a string */
  implicit def forceRandomAccessCharSeq(x: runtime.RichString): String = x.mkString
  implicit def lazyStreamToConsable[A](xs: => Stream[A]) = new runtime.StreamCons(xs)

  implicit def seqToCharSequence(xs: RandomAccessSeq[Char]): CharSequence = new CharSequence {
    def length: Int = xs.length
    def charAt(index: Int): Char = xs(index)
    def subSequence(start: Int, end: Int): CharSequence = seqToCharSequence(xs.slice(start, end))
    override def toString: String = xs.mkString("")
  }

  def currentThread = java.lang.Thread.currentThread()
}