// 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 IComparer interface implements a method that compares
    // two objects. It is used in conjunction with the Sort and
    // BinarySearch methods on the Array, List, and SortedList classes.
    public interface IComparer<in T>
    {
        // Compares two objects. An implementation of this method must return a
        // value less than zero if x is less than y, zero if x is equal to y, or a
        // value greater than zero if x is greater than y.
        //
        int Compare(T? x, T? y);
    }
}