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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.
#nullable enable
using System.Diagnostics.CodeAnalysis;
namespace System.Windows
{
/// <summary>
/// Identifier struct.
/// </summary>
internal readonly struct Id : IEquatable<Id>
{
private readonly int _id;
// It is possible that the id may be negative with value types. See BinaryObjectWriter.InternalGetId.
private Id(int id) => _id = id;
public static implicit operator int(Id value) => value._id;
public static implicit operator Id(int value) => new(value);
public override bool Equals([NotNullWhen(true)] object? obj)
=> (obj is Id id && Equals(id)) || (obj is int value && value == _id);
public bool Equals(Id other) => _id == other._id || -1 * _id == other._id;
public override readonly int GetHashCode() => _id < 0 ? (-1 * _id).GetHashCode() : _id.GetHashCode();
public override readonly string ToString() => _id.ToString();
public static bool operator ==(Id left, Id right) => left.Equals(right);
public static bool operator !=(Id left, Id right) => !(left == right);
}
}
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