Added NightAlert project for travel kit

ThirdParty/EngineIoClientDotNet/Src/Quobject.Collections.Immutable/IImmutableSet.cs

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+//
+// IImmutableSet.cs
+//
+// Author:
+//       Mike Krüger <mkrueger@xamarin.com>
+//
+// Copyright (c) 2013 Xamarin Inc. (http://xamarin.com)
+//
+// 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.Collections;
+using System.Collections.Generic;
+
+namespace Quobject.Collections.Immutable
+{
+    public interface IImmutableSet<T> : IReadOnlyCollection<T>, IEnumerable<T>, IEnumerable
+    {
+        IImmutableSet<T> Add(T value);
+
+        IImmutableSet<T> Clear();
+
+        bool Contains(T value);
+
+        IImmutableSet<T> Except(IEnumerable<T> other);
+
+        IImmutableSet<T> Intersect(IEnumerable<T> other);
+
+        bool IsProperSubsetOf(IEnumerable<T> other);
+
+        bool IsProperSupersetOf(IEnumerable<T> other);
+
+        bool IsSubsetOf(IEnumerable<T> other);
+
+        bool IsSupersetOf(IEnumerable<T> other);
+
+        bool Overlaps(IEnumerable<T> other);
+
+        IImmutableSet<T> Remove(T value);
+
+        bool SetEquals(IEnumerable<T> other);
+
+        IImmutableSet<T> SymmetricExcept(IEnumerable<T> other);
+
+        IImmutableSet<T> Union(IEnumerable<T> other);
+    }
+}