osu/osu.Game/Database/IHasOnlineID.cs

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// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using System;
namespace osu.Game.Database
{
public interface IHasOnlineID<out T>
where T : IEquatable<T>
{
/// <summary>
/// The server-side ID representing this instance, if one exists. Any value 0 or less denotes a missing ID (except in special cases where autoincrement is not used, like rulesets).
/// </summary>
/// <remarks>
/// Generally we use -1 when specifying "missing" in code, but values of 0 are also considered missing as the online source
/// is generally a MySQL autoincrement value, which can never be 0.
/// </remarks>
T OnlineID { get; }
}
}