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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
using System;
using System.Diagnostics;
using System.Threading;
namespace Tango.Scripting.Editors.Utils
{
/// <summary>
/// Invokes an action when it is disposed.
/// </summary>
/// <remarks>
/// This class ensures the callback is invoked at most once,
/// even when Dispose is called on multiple threads.
/// </remarks>
sealed class CallbackOnDispose : IDisposable
{
Action action;
public CallbackOnDispose(Action action)
{
Debug.Assert(action != null);
this.action = action;
}
public void Dispose()
{
Action a = Interlocked.Exchange(ref action, null);
if (a != null) {
a();
}
}
}
}
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