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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Diagnostics.CodeAnalysis;
namespace System
{
// The IComparable interface is implemented by classes that support an
// ordering of instances of the class. The ordering represented by
// IComparable can be used to sort arrays and collections of objects
// that implement the interface.
//
public interface IComparable
{
// Interface does not need to be marked with the serializable attribute
// Compares this object to another object, returning an integer that
// indicates the relationship. An implementation of this method must return
// a value less than zero if this is less than object, zero
// if this is equal to object, or a value greater than zero
// if this is greater than object.
//
int CompareTo(object? obj);
}
// Generic version of IComparable.
public interface IComparable<in T>
{
// Interface does not need to be marked with the serializable attribute
// Compares this object to another object, returning an integer that
// indicates the relationship. An implementation of this method must return
// a value less than zero if this is less than object, zero
// if this is equal to object, or a value greater than zero
// if this is greater than object.
//
int CompareTo([AllowNull] T other);
}
}
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