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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using System;
using System.Diagnostics;
using System.Threading;
namespace ICSharpCode.NRefactory.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>
public sealed class CallbackOnDispose : IDisposable
{
Action action;
public CallbackOnDispose(Action action)
{
if (action == null)
throw new ArgumentNullException("action");
this.action = action;
}
public void Dispose()
{
Action a = Interlocked.Exchange(ref action, null);
if (a != null) {
a();
}
}
}
}
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