Provide Double and Float bit conversion functions as extensions

Instance extension: Double/Float.toBits/toRawBits Companion extension: Double/Float.Companion.fromBits #KT-18264 Fixed
2017-07-20 00:55:55 +03:00
parent 6373ac7ef0
commit 7e48f8b180
2 changed files with 72 additions and 0 deletions
@@ -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())
+    }

 }