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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2007-2011, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.math
import java.{ lang => jl }
/** Conversions which present a consistent conversion interface
* across all the numeric types.
*/
trait ScalaNumericConversions extends ScalaNumber {
def toChar = intValue.toChar
def toByte = byteValue
def toShort = shortValue
def toInt = intValue
def toLong = longValue
def toFloat = floatValue
def toDouble = doubleValue
def isValidByte = isWhole && (toInt == toByte)
def isValidShort = isWhole && (toInt == toShort)
def isValidInt = isWhole && (toLong == toInt)
def isValidChar = isWhole && (toInt >= Char.MinValue && toInt <= Char.MaxValue)
protected def unifiedPrimitiveHashcode() = {
val lv = toLong
if (lv >= Int.MinValue && lv <= Int.MaxValue) lv.toInt
else lv.##
}
/** Should only be called after all known non-primitive
* types have been excluded. This method won't dispatch
* anywhere else after checking against the primitives
* to avoid infinite recursion between equals and this on
* unknown "Number" variants.
*
* Additionally, this should only be called if the numeric
* type is happy to be converted to Long, Float, and Double.
* If for instance a BigInt much larger than the Long range is
* sent here, it will claim equality with whatever Long is left
* in its lower 64 bits. Or a BigDecimal with more precision
* than Double can hold: same thing. There's no way given the
* interface available here to prevent this error.
*/
protected def unifiedPrimitiveEquals(x: Any) = x match {
case x: Char => isValidChar && (toInt == x.toInt)
case x: Byte => isValidByte && (toByte == x)
case x: Short => isValidShort && (toShort == x)
case x: Int => isValidInt && (toInt == x)
case x: Long => toLong == x
case x: Float => toFloat == x
case x: Double => toDouble == x
case _ => false
}
}
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