CancellationTokenRegistration.cs

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// 
// CancellationTokenRegistration.cs
//  
// Author:
//       Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
// 
// Copyright (c) 2009 Jérémie "Garuma" Laval
// 
// 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.

#if NET_4_0
using System;
using System.Threading;

namespace System.Threading
{
    public struct CancellationTokenRegistration: IDisposable, IEquatable<CancellationTokenRegistration>
    {
        int id;
        CancellationTokenSource source;
        
        internal CancellationTokenRegistration (int id, CancellationTokenSource source)
        {
            this.id = id;
            this.source = source;
        }

        #region IDisposable implementation
        public void Dispose ()
        {
            if (source != null)
                source.RemoveCallback (this);
        }
        #endregion

        #region IEquatable<CancellationTokenRegistration> implementation
        public bool Equals (CancellationTokenRegistration other)
        {
            return this.id == other.id && this.source == other.source;
        }
        
        public static bool operator== (CancellationTokenRegistration left, CancellationTokenRegistration right)
        {
            return left.Equals (right);
        }
        
        public static bool operator!= (CancellationTokenRegistration left, CancellationTokenRegistration right)
        {
            return !left.Equals (right);
        }
        #endregion
        
        public override int GetHashCode ()
        {
            return id.GetHashCode () ^ (source == null ? 0 : source.GetHashCode ());
        }

        public override bool Equals (object obj)
        {
            return (obj is CancellationTokenRegistration) ? Equals ((CancellationTokenRegistration)obj) : false;
        }
    }
}
#endif