NegFloat

An AnyVal for megative Floats.

Note: a NegFloat may not equal 0.0. If you want negative number or 0, use NegZFloat.

Because NegFloat is an AnyVal it will usually be as efficient as an Float, being boxed only when an Float would have been boxed.

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

scala> import anyvals._
import anyvals._

scala> NegFloat(-42.1fF)
res0: org.scalactic.anyvals.NegFloat = NegFloat(-42.1f)

scala> NegFloat(0.0fF)
<console>:14: error: NegFloat.apply can only be invoked on a megative (i < 0.0f) floating point literal, like NegFloat(-42.1fF).
              NegFloat(-42.1fF)
                      ^

NegFloat.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 NegFloat.apply, you'll get a compiler error that suggests you use a different factor method, NegFloat.from, instead:

scala> val x = -42.1fF
x: Float = -42.1f

scala> NegFloat(x)
<console>:15: error: NegFloat.apply can only be invoked on a floating point literal, like NegFloat(-42.1fF). Please use NegFloat.from instead.
              NegFloat(x)
                      ^

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

scala> NegFloat.from(x)
res3: Option[org.scalactic.anyvals.NegFloat] = Some(NegFloat(-42.1f))

scala> val y = 0.0fF
y: Float = 0.0f

scala> NegFloat.from(y)
res4: Option[org.scalactic.anyvals.NegFloat] = None

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

scala> def invert(pos: NegFloat): Float = Float.MaxValue - pos
invert: (pos: org.scalactic.anyvals.NegFloat)Float

scala> invert(-42.1fF)
res5: Float = 3.4028235E38

scala> invert(Float.MaxValue)
res6: Float = 0.0

scala> invert(0.0fF)
<console>:15: error: NegFloat.apply can only be invoked on a megative (i < 0.0f) floating point literal, like NegFloat(-42.1fF).
              invert(0.0F)
                     ^

scala> invert(0.0fF)
<console>:15: error: NegFloat.apply can only be invoked on a megative (i < 0.0f) floating point literal, like NegFloat(-42.1fF).
              invert(0.0fF)
                      ^

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

Source: NegFloat.scala

Linear Supertypes

AnyVal, Any

Value Members

final def !=(arg0: Any): Boolean

Definition Classes
Any
final def ##(): Int

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

Returns the remainder of the division of this value by x.
def %(x: Float): Float

Returns the remainder of the division of this value by x.
def %(x: Long): Float

Returns the remainder of the division of this value by x.
def %(x: Int): Float

Returns the remainder of the division of this value by x.
def %(x: Char): Float

Returns the remainder of the division of this value by x.
def %(x: Short): Float

Returns the remainder of the division of this value by x.
def %(x: Byte): Float

Returns the remainder of the division of this value by x.
def *(x: Double): Double

Returns the product of this value and x.
def *(x: Float): Float

Returns the product of this value and x.
def *(x: Long): Float

Returns the product of this value and x.
def *(x: Int): Float

Returns the product of this value and x.
def *(x: Char): Float

Returns the product of this value and x.
def *(x: Short): Float

Returns the product of this value and x.
def *(x: Byte): Float

Returns the product of this value and x.
def +(x: Double): Double

Returns the sum of this value and x.
def +(x: Float): Float

Returns the sum of this value and x.
def +(x: Long): Float

Returns the sum of this value and x.
def +(x: Int): Float

Returns the sum of this value and x.
def +(x: Char): Float

Returns the sum of this value and x.
def +(x: Short): Float

Returns the sum of this value and x.
def +(x: Byte): Float

Returns the sum of this value and x.
def +(x: String): String

Converts this NegFloat's value to a string then concatenates the given string.
Converts this NegFloat's value to a string then concatenates the given string.
def -(x: Double): Double

Returns the difference of this value and x.
def -(x: Float): Float

Returns the difference of this value and x.
def -(x: Long): Float

Returns the difference of this value and x.
def -(x: Int): Float

Returns the difference of this value and x.
def -(x: Char): Float

Returns the difference of this value and x.
def -(x: Short): Float

Returns the difference of this value and x.
def -(x: Byte): Float

Returns the difference of this value and x.
def /(x: Double): Double

Returns the quotient of this value and x.
def /(x: Float): Float

Returns the quotient of this value and x.
def /(x: Long): Float

Returns the quotient of this value and x.
def /(x: Int): Float

Returns the quotient of this value and x.
def /(x: Char): Float

Returns the quotient of this value and x.
def /(x: Short): Float

Returns the quotient of this value and x.
def /(x: Byte): Float

Returns the quotient of this value and x.
def <(x: Double): Boolean

Returns true if this value is less than x, false otherwise.
def <(x: Float): Boolean

Returns true if this value is less than x, false otherwise.
def <(x: Long): Boolean

Returns true if this value is less than x, false otherwise.
def <(x: Int): Boolean

Returns true if this value is less than x, false otherwise.
def <(x: Char): Boolean

Returns true if this value is less than x, false otherwise.
def <(x: Short): Boolean

Returns true if this value is less than x, false otherwise.
def <(x: Byte): Boolean

Returns true if this value is less than x, false otherwise.
def <=(x: Double): Boolean

Returns true if this value is less than or equal to x, false otherwise.
def <=(x: Float): Boolean

Returns true if this value is less than or equal to x, false otherwise.
def <=(x: Long): Boolean

Returns true if this value is less than or equal to x, false otherwise.
def <=(x: Int): Boolean

Returns true if this value is less than or equal to x, false otherwise.
def <=(x: Char): Boolean

Returns true if this value is less than or equal to x, false otherwise.
def <=(x: Short): Boolean

Returns true if this value is less than or equal to x, false otherwise.
def <=(x: Byte): Boolean

Returns true if this value is less than or equal to x, false otherwise.
final def ==(arg0: Any): Boolean

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

Returns true if this value is greater than x, false otherwise.
def >(x: Float): Boolean

Returns true if this value is greater than x, false otherwise.
def >(x: Long): Boolean

Returns true if this value is greater than x, false otherwise.
def >(x: Int): Boolean

Returns true if this value is greater than x, false otherwise.
def >(x: Char): Boolean

Returns true if this value is greater than x, false otherwise.
def >(x: Short): Boolean

Returns true if this value is greater than x, false otherwise.
def >(x: Byte): Boolean

Returns true if this value is greater than x, false otherwise.
def >=(x: Double): Boolean

Returns true if this value is greater than or equal to x, false otherwise.
def >=(x: Float): Boolean

Returns true if this value is greater than or equal to x, false otherwise.
def >=(x: Long): Boolean

Returns true if this value is greater than or equal to x, false otherwise.
def >=(x: Int): Boolean

Returns true if this value is greater than or equal to x, false otherwise.
def >=(x: Char): Boolean

Returns true if this value is greater than or equal to x, false otherwise.
def >=(x: Short): Boolean

Returns true if this value is greater than or equal to x, false otherwise.
def >=(x: Byte): Boolean

Returns true if this value is greater than or equal to x, false otherwise.
final def asInstanceOf[T0]: T0

Definition Classes
Any
def ceil: NegZFloat

Returns the smallest (closest to 0) NegZFloat that is greater than or equal to this NegZFloat and represents a mathematical integer.
def ensuringValid(f: (Float) ⇒ Float): NegFloat

Applies the passed Float => Float function to the underlying Float value, and if the result is positive, returns the result wrapped in a NegFloat, else throws AssertionError.
Applies the passed Float => Float function to the underlying Float value, and if the result is positive, returns the result wrapped in a NegFloat, else throws AssertionError.
This method will inspect the result of applying the given function to this NegFloat's underlying Float value and if the result is megative, it will return a NegFloat representing that value. Otherwise, the Float value returned by the given function is not megative, so this method will throw AssertionError.
This method differs from a vanilla assert or ensuring call in that you get something you didn't already have if the assertion succeeds: a type that promises an Float is megative. With this method, you are asserting that you are convinced the result of the computation represented by applying the given function to this NegFloat's value will not produce invalid value. Instead of producing such invalid values, this method will throw AssertionError.
f
the Float => Float function to apply to this NegFloat's underlying Float value.
returns
the result of applying this NegFloat's underlying Float value to to the passed function, wrapped in a NegFloat if it is megative (else throws AssertionError).

Exceptions thrown
AssertionError if the result of applying this NegFloat's underlying Float value to to the passed function is not megative.
def floor: NegFloat

Returns the greatest (closest to infinity) NegFloat that is less than or equal to this NegFloat and represents a mathematical integer.
def getClass(): Class[_ <: AnyVal]

Definition Classes
AnyVal → Any
def isFinite: Boolean

True if this NegFloat value is any finite value (i.e., it is neither positive nor negative infinity), else false.
True if this NegFloat value is any finite value (i.e., it is neither positive nor negative infinity), else false.
final def isInstanceOf[T0]: Boolean

Definition Classes
Any
def isNegInfinity: Boolean

True if this NegFloat value represents negative infinity, else false.
True if this NegFloat value represents negative infinity, else false.
def isWhole: Boolean

Indicates whether this NegFloat has a value that is a whole number: it is finite and it has no fraction part.
def max(that: NegFloat): NegFloat

Returns this if this > that or that otherwise.
Returns this if this > that or that otherwise.
def min(that: NegFloat): NegFloat

Returns this if this < that or that otherwise.
Returns this if this < that or that otherwise.
def plus(x: NegZFloat): NegFloat

Returns the NegFloat sum of this NegFloat's value and the given NegZFloat value.
Returns the NegFloat sum of this NegFloat's value and the given NegZFloat value.
This method will always succeed (not throw an exception) because adding a negative Float and non-positive Float and another negative Float will always result in another negative Float value (though the result may be infinity).
def round: NegZInt

Rounds this NegFloat value to the nearest whole number value that can be expressed as an NegZInt, returning the result as a NegZInt.
def toByte: Byte

Converts this NegFloat to a Byte.
Converts this NegFloat to a Byte.
def toChar: Char

Converts this NegFloat to a Char.
Converts this NegFloat to a Char.
def toDegrees: Float

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.
def toDouble: Double

Converts this NegFloat to a Double.
Converts this NegFloat to a Double.
def toFloat: Float

Converts this NegFloat to a Float.
Converts this NegFloat to a Float.
def toInt: Int

Converts this NegFloat to an Int.
Converts this NegFloat to an Int.
def toLong: Long

Converts this NegFloat to a Long.
Converts this NegFloat to a Long.
def toRadians: Float

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.
def toShort: Short

Converts this NegFloat to a Short.
Converts this NegFloat to a Short.
def toString(): String

A string representation of this NegFloat.
A string representation of this NegFloat.

Definition Classes
NegFloat → Any
def unary_+: NegFloat

Returns this value, unmodified.
def unary_-: PosFloat

Returns the negation of this value.
val value: Float

The Float value underlying this NegFloat.
The Float value underlying this NegFloat.

Related Docs: object NegFloat | package anyvals

final class NegFloat extends AnyVal

Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

def %(x: Double): Double

def %(x: Float): Float

def %(x: Long): Float

def %(x: Int): Float

def %(x: Char): Float

def %(x: Short): Float

def %(x: Byte): Float

def *(x: Double): Double

def *(x: Float): Float

def *(x: Long): Float

def *(x: Int): Float

def *(x: Char): Float

def *(x: Short): Float

def *(x: Byte): Float

def +(x: Double): Double

def +(x: Float): Float

def +(x: Long): Float

def +(x: Int): Float

def +(x: Char): Float

def +(x: Short): Float

def +(x: Byte): Float

def +(x: String): String

def -(x: Double): Double

def -(x: Float): Float

def -(x: Long): Float

def -(x: Int): Float

def -(x: Char): Float

def -(x: Short): Float

def -(x: Byte): Float

def /(x: Double): Double

def /(x: Float): Float

def /(x: Long): Float

def /(x: Int): Float

def /(x: Char): Float

def /(x: Short): Float

def /(x: Byte): Float

def <(x: Double): Boolean

def <(x: Float): Boolean

def <(x: Long): Boolean

def <(x: Int): Boolean

def <(x: Char): Boolean

def <(x: Short): Boolean

def <(x: Byte): Boolean

def <=(x: Double): Boolean

def <=(x: Float): Boolean

def <=(x: Long): Boolean

def <=(x: Int): Boolean

def <=(x: Char): Boolean

def <=(x: Short): Boolean

def <=(x: Byte): Boolean

final def ==(arg0: Any): Boolean

def >(x: Double): Boolean

def >(x: Float): Boolean

def >(x: Long): Boolean

def >(x: Int): Boolean

def >(x: Char): Boolean

def >(x: Short): Boolean

def >(x: Byte): Boolean

def >=(x: Double): Boolean

def >=(x: Float): Boolean

def >=(x: Long): Boolean

def >=(x: Int): Boolean

def >=(x: Char): Boolean

def >=(x: Short): Boolean

def >=(x: Byte): Boolean

final def asInstanceOf[T0]: T0

def ceil: NegZFloat

def ensuringValid(f: (Float) ⇒ Float): NegFloat

def floor: NegFloat

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

def isFinite: Boolean

final def isInstanceOf[T0]: Boolean

def isNegInfinity: Boolean

def isWhole: Boolean