ClearScript/ClearScript/Util/Scope.cs at master · ExtrieveTechnologies/ClearScript · GitHub

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// Licensed under the MIT license.

using System;

namespace Microsoft.ClearScript.Util

{

internal interface IScope<out T>: IDisposable

{

T Value { get; }

}

internal static class Scope

{

public static IDisposable Create(Action enterAction, Action exitAction)

{

return new ScopeImpl(enterAction, exitAction);

}

public static IScope<T> Create<T>(Func<T> enterFunc, Action<T> exitAction)

{

return new ScopeImpl<T>(enterFunc, exitAction);

}

#region Nested type: ScopeImpl

private sealed class ScopeImpl : IDisposable

{

private readonly Action exitAction;

private readonly OneWayFlag disposedFlag = new OneWayFlag();

public ScopeImpl(Action enterAction, Action exitAction)

{

this.exitAction = exitAction;

if (enterAction != null)

{

enterAction();

}

#region IDisposable implementation

public void Dispose()

{

if (disposedFlag.Set() && (exitAction != null))

{

exitAction();

}

#endregion

}

#endregion

#region Nested type: ScopeImpl<T>

private sealed class ScopeImpl<T> : IScope<T>

{

private readonly T value;

private readonly Action<T> exitAction;

private readonly OneWayFlag disposedFlag = new OneWayFlag();

public ScopeImpl(Func<T> enterFunc, Action<T> exitAction)

{

this.exitAction = exitAction;

if (enterFunc != null)

{

value = enterFunc();

}

#region IScope<T> implementation

public T Value

{

get { return value; }

}

public void Dispose()

{

if (disposedFlag.Set() && (exitAction != null))

{

exitAction(value);

}

#endregion

}

#endregion

}

ClearScript/ClearScript/Util/Scope.cs at master · ExtrieveTechnologies/ClearScript · GitHub

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