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Provide Double and Float bit conversion functions as extensions

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Instance extension: Double/Float.toBits/toRawBits
Companion extension: Double/Float.Companion.fromBits

 #KT-18264 Fixed
This commit is contained in:
Ilya Gorbunov
2017-07-20 00:55:55 +03:00
parent 6373ac7ef0
commit 7e48f8b180
2 changed files with 72 additions and 0 deletions
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libraries/stdlib/src/kotlin/util/Numbers.kt
+48
View File
@@ -40,3 +40,51 @@ public inline fun Double.isFinite(): Boolean = !isInfinite() && !isNaN()
*/
@kotlin.internal.InlineOnly
public inline fun Float.isFinite(): Boolean = !isInfinite() && !isNaN()
/**
* Returns a bit representation of the specified floating-point value as [Long]
* according to the IEEE 754 floating-point "double format" bit layout.
*/
@SinceKotlin("1.2")
@kotlin.internal.InlineOnly
public inline fun Double.toBits(): Long = java.lang.Double.doubleToLongBits(this)
/**
* Returns a bit representation of the specified floating-point value as [Long]
* according to the IEEE 754 floating-point "double format" bit layout,
* preserving `NaN` values exact layout.
*/
@SinceKotlin("1.2")
@kotlin.internal.InlineOnly
public inline fun Double.toRawBits(): Long = java.lang.Double.doubleToRawLongBits(this)
/**
* Returns the [Double] value corresponding to a given bit representation.
*/
@SinceKotlin("1.2")
@kotlin.internal.InlineOnly
public inline fun Double.Companion.fromBits(bits: Long) = java.lang.Double.longBitsToDouble(bits)
/**
* Returns a bit representation of the specified floating-point value as [Int]
* according to the IEEE 754 floating-point "single format" bit layout.
*/
@SinceKotlin("1.2")
@kotlin.internal.InlineOnly
public inline fun Float.toBits(): Int = java.lang.Float.floatToIntBits(this)
/**
* Returns a bit representation of the specified floating-point value as [Int]
* according to the IEEE 754 floating-point "single format" bit layout,
* preserving `NaN` values exact layout.
*/
@SinceKotlin("1.2")
@kotlin.internal.InlineOnly
public inline fun Float.toRawBits(): Int = java.lang.Float.floatToRawIntBits(this)
/**
* Returns the [Float] value corresponding to a given bit representation.
*/
@SinceKotlin("1.2")
@kotlin.internal.InlineOnly
public inline fun Float.Companion.fromBits(bits: Int): Float = java.lang.Float.intBitsToFloat(bits)
libraries/stdlib/test/numbers/NumbersJVMTest.kt
+24
View File
@@ -41,5 +41,29 @@ class NumbersJVMTest {
assertEquals(java.lang.Float.NEGATIVE_INFINITY, Float.NEGATIVE_INFINITY)
}
@Test fun doubleToBits() {
assertEquals(0x400921fb54442d18L, kotlin.math.PI.toBits())
assertEquals(kotlin.math.PI, Double.fromBits(0x400921fb54442d18L))
for (value in listOf(Double.NEGATIVE_INFINITY, -Double.MAX_VALUE, -1.0, -Double.MIN_VALUE, -0.0, 0.0, Double.POSITIVE_INFINITY, Double.MAX_VALUE, 1.0, Double.MIN_VALUE)) {
assertEquals(value, Double.fromBits(value.toBits()))
assertEquals(value, Double.fromBits(value.toRawBits()))
}
assertTrue(Double.NaN.toBits().let(Double.Companion::fromBits).isNaN())
assertTrue(Double.NaN.toRawBits().let { Double.fromBits(it) }.isNaN())
}
@Test fun floatToBits() {
val PI_F = kotlin.math.PI.toFloat()
assertEquals(0x40490fdb, PI_F.toBits())
assertEquals(PI_F, Float.fromBits(0x40490fdb))
for (value in listOf(Float.NEGATIVE_INFINITY, -Float.MAX_VALUE, -1.0F, -Float.MIN_VALUE, -0.0F, 0.0F, Float.POSITIVE_INFINITY, Float.MAX_VALUE, 1.0F, Float.MIN_VALUE)) {
assertEquals(value, Float.fromBits(value.toBits()))
assertEquals(value, Float.fromBits(value.toRawBits()))
}
assertTrue(Float.NaN.toBits().let(Float.Companion::fromBits).isNaN())
assertTrue(Float.NaN.toRawBits().let { Float.fromBits(it) }.isNaN())
}
}