// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Diagnostics.CodeAnalysis;
 
namespace System.Collections.Generic
{
    // The generic IEqualityComparer interface implements methods to check if two objects are equal
    // and generate Hashcode for an object.
    // It is used in Dictionary class.
    public interface IEqualityComparer<in T> where T : allows ref struct
    {
        bool Equals(T? x, T? y);
        int GetHashCode([DisallowNull] T obj);
    }
}