FloatToSortableInt() 공개 정적인 메소드

Converts a float value to a sortable signed int. The value is converted by getting their IEEE 754 floating-point "float format" bit layout and then some bits are swapped, to be able to compare the result as int. By this the precision is not reduced, but the value can easily used as an int. The sort order (including Float#NaN) is defined by Float#compareTo; {@code NaN} is greater than positive infinity.
public static FloatToSortableInt ( float val ) : int
val float
리턴 int
NumericUtils 1 문서
예제 #1
0
        public virtual void TestSortableFloatNaN()
        {
            int plusInf = NumericUtils.FloatToSortableInt(float.PositiveInfinity);

            foreach (float nan in FLOAT_NANs)
            {
                Assert.IsTrue(float.IsNaN(nan));
                uint sortable = (uint)NumericUtils.FloatToSortableInt(nan);
                Assert.IsTrue(sortable > plusInf, "Float not sorted correctly: " + nan + ", int repr: " + sortable + ", positive inf.: " + plusInf);
            }
        }
예제 #2
0
        public virtual void TestFloats()
        {
            float[] vals    = new float[] { float.NegativeInfinity, -2.3E25f, -1.0E15f, -1.0f, -1.0E-1f, -1.0E-2f, -0.0f, +0.0f, 1.0E-2f, 1.0E-1f, 1.0f, 1.0E15f, 2.3E25f, float.PositiveInfinity, float.NaN };
            int[]   intVals = new int[vals.Length];

            // check forward and back conversion
            for (int i = 0; i < vals.Length; i++)
            {
                intVals[i] = NumericUtils.FloatToSortableInt(vals[i]);
                Assert.IsTrue(vals[i].CompareTo(NumericUtils.SortableIntToFloat(intVals[i])) == 0, "forward and back conversion should generate same double");
            }

            // check sort order (prefixVals should be ascending)
            for (int i = 1; i < intVals.Length; i++)
            {
                Assert.IsTrue(intVals[i - 1] < intVals[i], "check sort order");
            }
        }