C# Lockable class to keep the object to lock and its sync object that is actually locked together.

Lockable.cs

/// <summary>
/// Class to keep an object to lock and its sync object that is actually locked together.
/// </summary>
/// <example>
/// Lockable<List<int>> someList = new Lockable<List<int>>(new List<int>());
/// lock (someList.Sync) {
///     List<int> list = someList;
///     list.Add(2);
///     list.Add(5);
///     list.Add(9);
/// }
/// </example>
sealed class Lockable<T> where T : class
{
	private readonly T _instance;
	private readonly object _sync;
	
	public Lockable(T instance)
	{
		_instance = instance;
		_sync = new object();
	}
	
	public static implicit operator T(Lockable<T> lockable) { return lockable.Instance; }
	
	public T Instance { get { return _instance; } }
	public object Sync { get { return _sync; } }
}