Class/Object

org.scalactic.anyvals

PosDouble

Related Docs: object PosDouble | package anyvals

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final class PosDouble extends AnyVal

An AnyVal for positive Doubles.

Note: a PosDouble may not equal 0. If you want positive number or 0, use PosZDouble.

Because PosDouble is an AnyVal it will usually be as efficient as an Double, being boxed only when a Double would have been boxed.

The PosDouble.apply factory method is implemented in terms of a macro that checks literals for validity at compile time. Calling PosDouble.apply with a literal Double value will either produce a valid PosDouble instance at run time or an error at compile time. Here's an example:

scala> import anyvals._
import anyvals._

scala> PosDouble(1.0)
res1: org.scalactic.anyvals.PosDouble = PosDouble(1.0)

scala> PosDouble(0.0)
<console>:14: error: PosDouble.apply can only be invoked on a positive (i > 0.0) floating point literal, like PosDouble(42.0).
              PosDouble(0.0)
                       ^

PosDouble.apply cannot be used if the value being passed is a variable (i.e., not a literal), because the macro cannot determine the validity of variables at compile time (just literals). If you try to pass a variable to PosDouble.apply, you'll get a compiler error that suggests you use a different factor method, PosDouble.from, instead:

scala> val x = 1.0
x: Double = 1.0

scala> PosDouble(x)
<console>:15: error: PosDouble.apply can only be invoked on a floating point literal, like PosDouble(42.0). Please use PosDouble.from instead.
              PosDouble(x)
                       ^

The PosDouble.from factory method will inspect the value at runtime and return an Option[PosDouble]. If the value is valid, PosDouble.from will return a Some[PosDouble], else it will return a None. Here's an example:

scala> PosDouble.from(x)
res4: Option[org.scalactic.anyvals.PosDouble] = Some(PosDouble(1.0))

scala> val y = 0.0
y: Double = 0.0

scala> PosDouble.from(y)
res5: Option[org.scalactic.anyvals.PosDouble] = None

The PosDouble.apply factory method is marked implicit, so that you can pass literal Doubles into methods that require PosDouble, and get the same compile-time checking you get when calling PosDouble.apply explicitly. Here's an example:

scala> def invert(pos: PosDouble): Double = Double.MaxValue - pos
invert: (pos: org.scalactic.anyvals.PosDouble)Double

scala> invert(1.1)
res6: Double = 1.7976931348623157E308

scala> invert(Double.MaxValue)
res8: Double = 0.0

scala> invert(0.0)
<console>:15: error: PosDouble.apply can only be invoked on a positive (i > 0.0) floating point literal, like PosDouble(42.0).
              invert(0.0)
                     ^

scala> invert(-1.0)
<console>:15: error: PosDouble.apply can only be invoked on a positive (i > 0.0) floating point literal, like PosDouble(42.0).
              invert(-1.0)
                      ^

This example also demonstrates that the PosDouble companion object also defines implicit widening conversions when a similar conversion is provided in Scala. This makes it convenient to use a PosDouble where a Double is needed. An example is the subtraction in the body of the invert method defined above, Double.MaxValue - pos. Although Double.MaxValue is a Double, which has no - method that takes a PosDouble (the type of pos), you can still subtract pos, because the PosDouble will be implicitly widened to Double.

Source
PosDouble.scala
Linear Supertypes
AnyVal, Any
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Value Members

  1. final def !=(arg0: Any): Boolean

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    Definition Classes
    Any
  2. final def ##(): Int

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    Definition Classes
    Any
  3. def %(x: Double): Double

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    Returns the remainder of the division of this value by x.

  4. def %(x: Float): Double

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    Returns the remainder of the division of this value by x.

  5. def %(x: Long): Double

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    Returns the remainder of the division of this value by x.

  6. def %(x: Int): Double

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    Returns the remainder of the division of this value by x.

  7. def %(x: Char): Double

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    Returns the remainder of the division of this value by x.

  8. def %(x: Short): Double

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    Returns the remainder of the division of this value by x.

  9. def %(x: Byte): Double

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    Returns the remainder of the division of this value by x.

  10. def *(x: Double): Double

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    Returns the product of this value and x.

  11. def *(x: Float): Double

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    Returns the product of this value and x.

  12. def *(x: Long): Double

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    Returns the product of this value and x.

  13. def *(x: Int): Double

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    Returns the product of this value and x.

  14. def *(x: Char): Double

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    Returns the product of this value and x.

  15. def *(x: Short): Double

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    Returns the product of this value and x.

  16. def *(x: Byte): Double

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    Returns the product of this value and x.

  17. def +(x: Double): Double

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    Returns the sum of this value and x.

  18. def +(x: Float): Double

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    Returns the sum of this value and x.

  19. def +(x: Long): Double

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    Returns the sum of this value and x.

  20. def +(x: Int): Double

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    Returns the sum of this value and x.

  21. def +(x: Char): Double

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    Returns the sum of this value and x.

  22. def +(x: Short): Double

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    Returns the sum of this value and x.

  23. def +(x: Byte): Double

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    Returns the sum of this value and x.

  24. def +(x: String): String

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    Converts this PosDouble's value to a string then concatenates the given string.

    Converts this PosDouble's value to a string then concatenates the given string.

  25. def -(x: Double): Double

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    Returns the difference of this value and x.

  26. def -(x: Float): Double

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    Returns the difference of this value and x.

  27. def -(x: Long): Double

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    Returns the difference of this value and x.

  28. def -(x: Int): Double

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    Returns the difference of this value and x.

  29. def -(x: Char): Double

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    Returns the difference of this value and x.

  30. def -(x: Short): Double

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    Returns the difference of this value and x.

  31. def -(x: Byte): Double

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    Returns the difference of this value and x.

  32. def /(x: Double): Double

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    Returns the quotient of this value and x.

  33. def /(x: Float): Double

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    Returns the quotient of this value and x.

  34. def /(x: Long): Double

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    Returns the quotient of this value and x.

  35. def /(x: Int): Double

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    Returns the quotient of this value and x.

  36. def /(x: Char): Double

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    Returns the quotient of this value and x.

  37. def /(x: Short): Double

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    Returns the quotient of this value and x.

  38. def /(x: Byte): Double

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    Returns the quotient of this value and x.

  39. def <(x: Double): Boolean

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    Returns true if this value is less than x, false otherwise.

  40. def <(x: Float): Boolean

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    Returns true if this value is less than x, false otherwise.

  41. def <(x: Long): Boolean

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    Returns true if this value is less than x, false otherwise.

  42. def <(x: Int): Boolean

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    Returns true if this value is less than x, false otherwise.

  43. def <(x: Char): Boolean

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    Returns true if this value is less than x, false otherwise.

  44. def <(x: Short): Boolean

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    Returns true if this value is less than x, false otherwise.

  45. def <(x: Byte): Boolean

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    Returns true if this value is less than x, false otherwise.

  46. def <=(x: Double): Boolean

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    Returns true if this value is less than or equal to x, false otherwise.

  47. def <=(x: Float): Boolean

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    Returns true if this value is less than or equal to x, false otherwise.

  48. def <=(x: Long): Boolean

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    Returns true if this value is less than or equal to x, false otherwise.

  49. def <=(x: Int): Boolean

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    Returns true if this value is less than or equal to x, false otherwise.

  50. def <=(x: Char): Boolean

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    Returns true if this value is less than or equal to x, false otherwise.

  51. def <=(x: Short): Boolean

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    Returns true if this value is less than or equal to x, false otherwise.

  52. def <=(x: Byte): Boolean

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    Returns true if this value is less than or equal to x, false otherwise.

  53. final def ==(arg0: Any): Boolean

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    Definition Classes
    Any
  54. def >(x: Double): Boolean

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    Returns true if this value is greater than x, false otherwise.

  55. def >(x: Float): Boolean

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    Returns true if this value is greater than x, false otherwise.

  56. def >(x: Long): Boolean

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    Returns true if this value is greater than x, false otherwise.

  57. def >(x: Int): Boolean

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    Returns true if this value is greater than x, false otherwise.

  58. def >(x: Char): Boolean

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    Returns true if this value is greater than x, false otherwise.

  59. def >(x: Short): Boolean

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    Returns true if this value is greater than x, false otherwise.

  60. def >(x: Byte): Boolean

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    Returns true if this value is greater than x, false otherwise.

  61. def >=(x: Double): Boolean

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    Returns true if this value is greater than or equal to x, false otherwise.

  62. def >=(x: Float): Boolean

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    Returns true if this value is greater than or equal to x, false otherwise.

  63. def >=(x: Long): Boolean

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    Returns true if this value is greater than or equal to x, false otherwise.

  64. def >=(x: Int): Boolean

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    Returns true if this value is greater than or equal to x, false otherwise.

  65. def >=(x: Char): Boolean

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    Returns true if this value is greater than or equal to x, false otherwise.

  66. def >=(x: Short): Boolean

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    Returns true if this value is greater than or equal to x, false otherwise.

  67. def >=(x: Byte): Boolean

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    Returns true if this value is greater than or equal to x, false otherwise.

  68. final def asInstanceOf[T0]: T0

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    Definition Classes
    Any
  69. def ceil: PosDouble

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  70. def floor: PosZDouble

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  71. def getClass(): Class[_ <: AnyVal]

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    Definition Classes
    AnyVal → Any
  72. final def isInstanceOf[T0]: Boolean

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    Definition Classes
    Any
  73. def isPosInfinity: Boolean

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  74. def isWhole: Boolean

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  75. def max(that: PosDouble): PosDouble

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    Returns this if this > that or that otherwise.

    Returns this if this > that or that otherwise.

  76. def min(that: PosDouble): PosDouble

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    Returns this if this < that or that otherwise.

    Returns this if this < that or that otherwise.

  77. def round: PosZLong

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  78. def to(end: Double, step: Double): Inclusive[Double]

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    Create an inclusive Range from this PosDouble value to the specified end with the specified step value.

    Create an inclusive Range from this PosDouble value to the specified end with the specified step value.

    end

    The final bound of the range to make.

    step

    The number to increase by for each step of the range.

    returns

    A scala.collection.immutable.NumericRange.Inclusive[Double] from this up to and including end.

  79. def to(end: Double): Partial[Double, NumericRange[Double]]

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    Create an inclusive Range from this PosDouble value to the specified end with step value 1.

    Create an inclusive Range from this PosDouble value to the specified end with step value 1.

    end

    The final bound of the range to make.

    returns

    A NumericRange[Double]] from this up to and including end.

  80. def toByte: Byte

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    Converts this PosDouble to a Byte.

    Converts this PosDouble to a Byte.

  81. def toChar: Char

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    Converts this PosDouble to a Char.

    Converts this PosDouble to a Char.

  82. def toDegrees: Double

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    Converts an angle measured in radians to an approximately equivalent angle measured in degrees.

    Converts an angle measured in radians to an approximately equivalent angle measured in degrees.

    returns

    the measurement of the angle x in degrees.

  83. def toDouble: Double

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    Converts this PosDouble to a Double.

    Converts this PosDouble to a Double.

  84. def toFloat: Float

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    Converts this PosDouble to a Float.

    Converts this PosDouble to a Float.

  85. def toInt: Int

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    Converts this PosDouble to an Int.

    Converts this PosDouble to an Int.

  86. def toLong: Long

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    Converts this PosDouble to a Long.

    Converts this PosDouble to a Long.

  87. def toRadians: Double

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    Converts an angle measured in degrees to an approximately equivalent angle measured in radians.

    Converts an angle measured in degrees to an approximately equivalent angle measured in radians.

    returns

    the measurement of the angle x in radians.

  88. def toShort: Short

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    Converts this PosDouble to a Short.

    Converts this PosDouble to a Short.

  89. def toString(): String

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    A string representation of this PosDouble.

    A string representation of this PosDouble.

    Definition Classes
    PosDouble → Any
  90. def unary_+: PosDouble

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    Returns this value, unmodified.

  91. def unary_-: Double

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    Returns the negation of this value.

  92. def until(end: Double, step: Double): Exclusive[Double]

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    Create a Range from this PosDouble value until the specified end (exclusive) with the specified step value.

    Create a Range from this PosDouble value until the specified end (exclusive) with the specified step value.

    end

    The final bound of the range to make.

    step

    The number to increase by for each step of the range.

    returns

    A scala.collection.immutable.NumericRange.Exclusive[Double] from this up to but not including end.

  93. def until(end: Double): Partial[Double, NumericRange[Double]]

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    Create a Range from this PosDouble value until the specified end (exclusive) with step value 1.

    Create a Range from this PosDouble value until the specified end (exclusive) with step value 1.

    end

    The final bound of the range to make.

    returns

    A NumericRange[Double]] from this up to but not including end.

  94. val value: Double

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    The Double value underlying this PosDouble.

    The Double value underlying this PosDouble.

Inherited from AnyVal

Inherited from Any

Ungrouped