Simple C# class to calculate Cantor's pairing function

CantorPairUtility.cs

using System;

public static class CantorPairUtility {
    
    public static int CantorPair(int x, int y) {
        return (((x + y) * (x + y + 1)) / 2) + y;
    }

    public static void ReverseCantorPair(int cantor, out int x, out int y) {
        var t = (int) Math.Floor((-1 + Math.Sqrt(1 + 8 * cantor)) / 2);
        x = t * (t + 3) / 2 - cantor;
        y = cantor - t * (t + 1) / 2;
    }

    public static int SignedCantorPair(int x, int y) {
        x = x >= 0 ? 2 * x : -2 * x + 1;
        y = y >= 0 ? 2 * y : -2 * y + 1;

        return (((x + y) * (x + y + 1)) / 2) + y;
    }

    public static void SignedReverseCantorPair(int cantor, out int x, out int y) {
        var t = (int) Math.Floor((-1 + Math.Sqrt(1 + 8 * cantor)) / 2);
        x = t * (t + 3) / 2 - cantor;
        y = cantor - t * (t + 1) / 2;

        x = x % 2 == 0 ? x / 2 : ((1 - x) / 2);
        y = y % 2 == 0 ? y / 2 : ((1 - y) / 2);
    }
}