using System.Collections.Generic;

namespace AlicizaX
{
    internal sealed class ReferenceComparer<T> : IEqualityComparer<T>
        where T : class
    {
        public static readonly ReferenceComparer<T> Instance = new ReferenceComparer<T>();

        private ReferenceComparer() { }

        public bool Equals(T x, T y) => ReferenceEquals(x, y);

        public int GetHashCode(T obj)
            => System.Runtime.CompilerServices.RuntimeHelpers.GetHashCode(obj);
    }
}