Equality Routines.

using JetBrains.Annotations;

namespace Cadwise.DressCode.Amidala.Commons.System
{
    public static class EqualityRoutine
    {
        private const int MagicPrime = 397;

        public static int HashCombine(int hash, int value)
        {
            unchecked
            {
                return (hash * MagicPrime) ^ value;
            }
        }

        public static int HashCombine(int hash, [CanBeNull] object value)
        {
            unchecked
            {
                return (hash * MagicPrime) ^ (value?.GetHashCode() ?? 0);
            }
        }

        public static bool TrivialEquality([NotNull] object self, [CanBeNull] object right, out bool result)
        {
            if (ReferenceEquals(null, right))
            {
                result = false;
                return true;
            }

            if (ReferenceEquals(self, right))
            {
                result = true;
                return true;
            }

            result = false;
            return false;
        }
    }
}