NullableComparer.cs

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using System.Diagnostics.CodeAnalysis;
using System.Runtime.CompilerServices;
 
namespace System.Collections.Generic;
 
[Serializable]
[TypeForwardedFrom("mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089")]
public sealed class NullableComparer<T> : Comparer<T?> where T : struct, IComparable<T>
{
    public override int Compare(T? x, T? y)
    {
        if (x.HasValue)
        {
            if (y.HasValue)
            {
                return x.value.CompareTo(y.value);
            }
            return 1;
        }
        if (y.HasValue)
        {
            return -1;
        }
        return 0;
    }
 
    public override bool Equals([NotNullWhen(true)] object? obj)
    {
        if (obj != null)
        {
            return GetType() == obj.GetType();
        }
        return false;
    }
 
    public override int GetHashCode()
    {
        return GetType().GetHashCode();
    }
}