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From nightowl...@apache.org
Subject [03/58] [abbrv] lucenenet git commit: Added TreeSet and TreeDictionary from C5 to the Support namespace
Date Thu, 10 Nov 2016 11:33:14 GMT
http://git-wip-us.apache.org/repos/asf/lucenenet/blob/5f198526/src/Lucene.Net.Tests/core/Support/C5/Wrappers.cs
----------------------------------------------------------------------
diff --git a/src/Lucene.Net.Tests/core/Support/C5/Wrappers.cs b/src/Lucene.Net.Tests/core/Support/C5/Wrappers.cs
new file mode 100644
index 0000000..73ed656
--- /dev/null
+++ b/src/Lucene.Net.Tests/core/Support/C5/Wrappers.cs
@@ -0,0 +1,2338 @@
+/*
+ Copyright (c) 2003-2016 Niels Kokholm, Peter Sestoft, and Rasmus Lystrøm
+ 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.Collections.Generic;
+
+namespace Lucene.Net.Support.C5
+{
+    /// <summary>
+    /// A read-only wrapper class for a generic enumerator
+    /// </summary>
+    [Serializable]
+    public class GuardedEnumerator<T> : IEnumerator<T>
+    {
+        #region Fields
+
+        IEnumerator<T> enumerator;
+
+        #endregion
+
+        #region Constructor
+
+        /// <summary>
+        /// Create a wrapper around a generic enumerator
+        /// </summary>
+        /// <param name="enumerator">The enumerator to wrap</param>
+        public GuardedEnumerator(IEnumerator<T> enumerator)
+        { this.enumerator = enumerator; }
+
+        #endregion
+
+        #region IEnumerator<T> Members
+
+        /// <summary>
+        /// Move wrapped enumerator to next item, or the first item if
+        /// this is the first call to MoveNext. 
+        /// </summary>
+        /// <returns>True if enumerator is valid now</returns>
+        public bool MoveNext() { return enumerator.MoveNext(); }
+
+
+        /// <summary>
+        /// Undefined if enumerator is not valid (MoveNext hash been called returning true)
+        /// </summary>
+        /// <value>The current item of the wrapped enumerator.</value>
+        public T Current { get { return enumerator.Current; } }
+
+        #endregion
+
+        #region IDisposable Members
+
+        //TODO: consider possible danger of calling through to Dispose. 
+        /// <summary>
+        /// Dispose wrapped enumerator.
+        /// </summary>
+        public void Dispose() { enumerator.Dispose(); }
+
+        #endregion
+
+
+        #region IEnumerator Members
+
+        object System.Collections.IEnumerator.Current
+        {
+            get { return enumerator.Current; }
+        }
+
+        void System.Collections.IEnumerator.Reset()
+        {
+            enumerator.Reset();
+        }
+
+        #endregion
+    }
+
+
+
+    /// <summary>
+    /// A read-only wrapper class for a generic enumerable
+    ///
+    /// <i>This is mainly interesting as a base of other guard classes</i>
+    /// </summary>
+    [Serializable]
+    public class GuardedEnumerable<T> : System.Collections.Generic.IEnumerable<T>
+    {
+        #region Fields
+
+        System.Collections.Generic.IEnumerable<T> enumerable;
+
+        #endregion
+
+        #region Constructor
+
+        /// <summary>
+        /// Wrap an enumerable in a read-only wrapper
+        /// </summary>
+        /// <param name="enumerable">The enumerable to wrap</param>
+        public GuardedEnumerable(System.Collections.Generic.IEnumerable<T> enumerable)
+        { this.enumerable = enumerable; }
+
+        #endregion
+
+        #region System.Collections.Generic.IEnumerable<T> Members
+
+        /// <summary>
+        /// Get an enumerator from the wrapped enumerable
+        /// </summary>
+        /// <returns>The enumerator (itself wrapped)</returns>
+        public IEnumerator<T> GetEnumerator()
+        { return new GuardedEnumerator<T>(enumerable.GetEnumerator()); }
+
+        #endregion
+
+        #region IEnumerable Members
+
+        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
+        {
+            return GetEnumerator();
+        }
+
+        #endregion
+
+    }
+
+
+
+    /// <summary>
+    /// A read-only wrapper for a generic directed enumerable
+    ///
+    /// <i>This is mainly interesting as a base of other guard classes</i>
+    /// </summary>
+    [Serializable]
+    public class GuardedDirectedEnumerable<T> : GuardedEnumerable<T>, IDirectedEnumerable<T>
+    {
+        #region Fields
+
+        IDirectedEnumerable<T> directedenumerable;
+
+        #endregion
+
+        #region Constructor
+
+        /// <summary>
+        /// Wrap a directed enumerable in a read-only wrapper
+        /// </summary>
+        /// <param name="directedenumerable">the collection to wrap</param>
+        public GuardedDirectedEnumerable(IDirectedEnumerable<T> directedenumerable)
+            : base(directedenumerable)
+        { this.directedenumerable = directedenumerable; }
+
+        #endregion
+
+        #region IDirectedEnumerable<T> Members
+
+        /// <summary>
+        /// Get a enumerable that enumerates the wrapped collection in the opposite direction
+        /// </summary>
+        /// <returns>The mirrored enumerable</returns>
+        public IDirectedEnumerable<T> Backwards()
+        { return new GuardedDirectedEnumerable<T>(directedenumerable.Backwards()); }
+
+
+        /// <summary>
+        /// <code>Forwards</code> if same, else <code>Backwards</code>
+        /// </summary>
+        /// <value>The enumeration direction relative to the original collection.</value>
+        public EnumerationDirection Direction
+        { get { return directedenumerable.Direction; } }
+
+        #endregion
+    }
+
+
+
+    /// <summary>
+    /// A read-only wrapper for an ICollectionValue&lt;T&gt;
+    ///
+    /// <i>This is mainly interesting as a base of other guard classes</i>
+    /// </summary>
+    [Serializable]
+    public class GuardedCollectionValue<T> : GuardedEnumerable<T>, ICollectionValue<T>
+    {
+        #region Events
+        /// <summary>
+        /// The ListenableEvents value of the wrapped collection
+        /// </summary>
+        /// <value></value>
+        public virtual EventTypeEnum ListenableEvents { get { return collectionvalue.ListenableEvents; } }
+
+        /// <summary>
+        /// The ActiveEvents value of the wrapped collection
+        /// </summary>
+        /// <value></value>
+        public virtual EventTypeEnum ActiveEvents { get { return collectionvalue.ActiveEvents; } }
+
+        ProxyEventBlock<T> eventBlock;
+        /// <summary>
+        /// The change event. Will be raised for every change operation on the collection.
+        /// </summary>
+        public event CollectionChangedHandler<T> CollectionChanged
+        {
+            add { (eventBlock ?? (eventBlock = new ProxyEventBlock<T>(this, collectionvalue))).CollectionChanged += value; }
+            remove { if (eventBlock != null) eventBlock.CollectionChanged -= value; }
+        }
+
+        /// <summary>
+        /// The change event. Will be raised for every change operation on the collection.
+        /// </summary>
+        public event CollectionClearedHandler<T> CollectionCleared
+        {
+            add { (eventBlock ?? (eventBlock = new ProxyEventBlock<T>(this, collectionvalue))).CollectionCleared += value; }
+            remove { if (eventBlock != null) eventBlock.CollectionCleared -= value; }
+        }
+
+        /// <summary>
+        /// The item added  event. Will be raised for every individual addition to the collection.
+        /// </summary>
+        public event ItemsAddedHandler<T> ItemsAdded
+        {
+            add { (eventBlock ?? (eventBlock = new ProxyEventBlock<T>(this, collectionvalue))).ItemsAdded += value; }
+            remove { if (eventBlock != null) eventBlock.ItemsAdded -= value; }
+        }
+
+        /// <summary>
+        /// The item added  event. Will be raised for every individual addition to the collection.
+        /// </summary>
+        public event ItemInsertedHandler<T> ItemInserted
+        {
+            add { (eventBlock ?? (eventBlock = new ProxyEventBlock<T>(this, collectionvalue))).ItemInserted += value; }
+            remove { if (eventBlock != null) eventBlock.ItemInserted -= value; }
+        }
+
+        /// <summary>
+        /// The item removed event. Will be raised for every individual removal from the collection.
+        /// </summary>
+        public event ItemsRemovedHandler<T> ItemsRemoved
+        {
+            add { (eventBlock ?? (eventBlock = new ProxyEventBlock<T>(this, collectionvalue))).ItemsRemoved += value; }
+            remove { if (eventBlock != null) eventBlock.ItemsRemoved -= value; }
+        }
+
+        /// <summary>
+        /// The item removed event. Will be raised for every individual removal from the collection.
+        /// </summary>
+        public event ItemRemovedAtHandler<T> ItemRemovedAt
+        {
+            add { (eventBlock ?? (eventBlock = new ProxyEventBlock<T>(this, collectionvalue))).ItemRemovedAt += value; }
+            remove { if (eventBlock != null) eventBlock.ItemRemovedAt -= value; }
+        }
+        #endregion
+
+        #region Fields
+
+        ICollectionValue<T> collectionvalue;
+
+        #endregion
+
+        #region Constructor
+
+        /// <summary>
+        /// Wrap a ICollectionValue&lt;T&gt; in a read-only wrapper
+        /// </summary>
+        /// <param name="collectionvalue">the collection to wrap</param>
+        public GuardedCollectionValue(ICollectionValue<T> collectionvalue)
+            : base(collectionvalue)
+        { this.collectionvalue = collectionvalue; }
+
+        #endregion
+
+        #region ICollection<T> Members
+
+        /// <summary>
+        /// Get the size of the wrapped collection
+        /// </summary>
+        /// <value>The size</value>
+        public virtual bool IsEmpty { get { return collectionvalue.IsEmpty; } }
+
+        /// <summary>
+        /// Get the size of the wrapped collection
+        /// </summary>
+        /// <value>The size</value>
+        public virtual int Count { get { return collectionvalue.Count; } }
+
+        /// <summary>
+        /// The value is symbolic indicating the type of asymptotic complexity
+        /// in terms of the size of this collection (worst-case or amortized as
+        /// relevant).
+        /// </summary>
+        /// <value>A characterization of the speed of the 
+        /// <code>Count</code> property in this collection.</value>
+        public virtual Speed CountSpeed { get { return collectionvalue.CountSpeed; } }
+
+        /// <summary>
+        /// Copy the items of the wrapped collection to an array
+        /// </summary>
+        /// <param name="a">The array</param>
+        /// <param name="i">Starting offset</param>
+        public virtual void CopyTo(T[] a, int i) { collectionvalue.CopyTo(a, i); }
+
+        /// <summary>
+        /// Create an array from the items of the wrapped collection
+        /// </summary>
+        /// <returns>The array</returns>
+        public virtual T[] ToArray() { return collectionvalue.ToArray(); }
+
+        /// <summary>
+        /// Apply a delegate to all items of the wrapped enumerable.
+        /// </summary>
+        /// <param name="a">The delegate to apply</param>
+        //TODO: change this to throw an exception?
+        public virtual void Apply(Action<T> a) { collectionvalue.Apply(a); }
+
+
+        /// <summary>
+        /// Check if there exists an item  that satisfies a
+        /// specific predicate in the wrapped enumerable.
+        /// </summary>
+        /// <param name="filter">A filter delegate 
+        /// (<see cref="T:C5.Filter`1"/>) defining the predicate</param>
+        /// <returns>True is such an item exists</returns>
+        public virtual bool Exists(Func<T, bool> filter) { return collectionvalue.Exists(filter); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="filter"></param>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public virtual bool Find(Func<T, bool> filter, out T item) { return collectionvalue.Find(filter, out item); }
+
+        /// <summary>
+        /// Check if all items in the wrapped enumerable satisfies a specific predicate.
+        /// </summary>
+        /// <param name="filter">A filter delegate 
+        /// (<see cref="T:C5.Filter`1"/>) defining the predicate</param>
+        /// <returns>True if all items satisfies the predicate</returns>
+        public virtual bool All(Func<T, bool> filter) { return collectionvalue.All(filter); }
+
+        /// <summary>
+        /// Create an enumerable, enumerating the items of this collection that satisfies 
+        /// a certain condition.
+        /// </summary>
+        /// <param name="filter">The T->bool filter delegate defining the condition</param>
+        /// <returns>The filtered enumerable</returns>
+        public virtual System.Collections.Generic.IEnumerable<T> Filter(Func<T, bool> filter) { return collectionvalue.Filter(filter); }
+
+        /// <summary>
+        /// Choose some item of this collection. 
+        /// </summary>
+        /// <exception cref="NoSuchItemException">if collection is empty.</exception>
+        /// <returns></returns>
+        public virtual T Choose() { return collectionvalue.Choose(); }
+
+        #endregion
+
+        #region IShowable Members
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="stringbuilder"></param>
+        /// <param name="formatProvider"></param>
+        /// <param name="rest"></param>
+        /// <returns></returns>
+        public bool Show(System.Text.StringBuilder stringbuilder, ref int rest, IFormatProvider formatProvider)
+        {
+            return collectionvalue.Show(stringbuilder, ref rest, formatProvider);
+        }
+        #endregion
+
+        #region IFormattable Members
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="format"></param>
+        /// <param name="formatProvider"></param>
+        /// <returns></returns>
+        public string ToString(string format, IFormatProvider formatProvider)
+        {
+            return collectionvalue.ToString(format, formatProvider);
+        }
+
+        #endregion
+    }
+
+
+
+    /// <summary>
+    /// A read-only wrapper for a directed collection
+    ///
+    /// <i>This is mainly interesting as a base of other guard classes</i>
+    /// </summary>
+    [Serializable]
+    public class GuardedDirectedCollectionValue<T> : GuardedCollectionValue<T>, IDirectedCollectionValue<T>
+    {
+        #region Fields
+
+        IDirectedCollectionValue<T> directedcollection;
+
+        #endregion
+
+        #region Constructor
+
+        /// <summary>
+        /// Wrap a directed collection in a read-only wrapper
+        /// </summary>
+        /// <param name="directedcollection">the collection to wrap</param>
+        public GuardedDirectedCollectionValue(IDirectedCollectionValue<T> directedcollection)
+            :
+            base(directedcollection)
+        { this.directedcollection = directedcollection; }
+
+        #endregion
+
+        #region IDirectedCollection<T> Members
+
+        /// <summary>
+        /// Get a collection that enumerates the wrapped collection in the opposite direction
+        /// </summary>
+        /// <returns>The mirrored collection</returns>
+        public virtual IDirectedCollectionValue<T> Backwards()
+        { return new GuardedDirectedCollectionValue<T>(directedcollection.Backwards()); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="predicate"></param>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public virtual bool FindLast(Func<T, bool> predicate, out T item) { return directedcollection.FindLast(predicate, out item); }
+
+        #endregion
+
+        #region IDirectedEnumerable<T> Members
+
+        IDirectedEnumerable<T> IDirectedEnumerable<T>.Backwards()
+        { return Backwards(); }
+
+
+        /// <summary>
+        /// <code>Forwards</code> if same, else <code>Backwards</code>
+        /// </summary>
+        /// <value>The enumeration direction relative to the original collection.</value>
+        public EnumerationDirection Direction
+        { get { return directedcollection.Direction; } }
+
+        #endregion
+    }
+
+
+
+    /// <summary>
+    /// A read-only wrapper for an <see cref="T:C5.ICollection`1"/>,
+    /// <para>
+    /// <i>Suitable for wrapping hash tables, <see cref="T:C5.HashSet`1"/>
+    /// and <see cref="T:C5.HashBag`1"/>  </i></para>
+    /// </summary>
+    [Serializable]
+    public class GuardedCollection<T> : GuardedCollectionValue<T>, ICollection<T>
+    {
+        #region Fields
+
+        ICollection<T> collection;
+
+        #endregion
+
+        #region Constructor
+
+        /// <summary>
+        /// Wrap an ICollection&lt;T&gt; in a read-only wrapper
+        /// </summary>
+        /// <param name="collection">the collection to wrap</param>
+        public GuardedCollection(ICollection<T> collection)
+            : base(collection)
+        {
+            this.collection = collection;
+        }
+
+        #endregion
+
+        #region ICollection<T> Members
+
+        /// <summary>
+        /// (This is a read-only wrapper)
+        /// </summary>
+        /// <value>True</value>
+        public virtual bool IsReadOnly { get { return true; } }
+
+
+        /// <summary> </summary>
+        /// <value>Speed of wrapped collection</value>
+        public virtual Speed ContainsSpeed { get { return collection.ContainsSpeed; } }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <returns></returns>
+        public virtual int GetUnsequencedHashCode()
+        { return collection.GetUnsequencedHashCode(); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="that"></param>
+        /// <returns></returns>
+        public virtual bool UnsequencedEquals(ICollection<T> that)
+        { return collection.UnsequencedEquals(that); }
+
+
+        /// <summary>
+        /// Check if an item is in the wrapped collection
+        /// </summary>
+        /// <param name="item">The item</param>
+        /// <returns>True if found</returns>
+        public virtual bool Contains(T item) { return collection.Contains(item); }
+
+
+        /// <summary>
+        /// Count the number of times an item appears in the wrapped collection
+        /// </summary>
+        /// <param name="item">The item</param>
+        /// <returns>The number of copies</returns>
+        public virtual int ContainsCount(T item) { return collection.ContainsCount(item); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <returns></returns>
+        public virtual ICollectionValue<T> UniqueItems() { return new GuardedCollectionValue<T>(collection.UniqueItems()); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <returns></returns>
+        public virtual ICollectionValue<KeyValuePair<T, int>> ItemMultiplicities() { return new GuardedCollectionValue<KeyValuePair<T, int>>(collection.ItemMultiplicities()); }
+
+        /// <summary>
+        /// Check if all items in the argument is in the wrapped collection
+        /// </summary>
+        /// <param name="items">The items</param>
+        /// <returns>True if so</returns>
+        public virtual bool ContainsAll(System.Collections.Generic.IEnumerable<T> items) { return collection.ContainsAll(items); }
+
+        /// <summary> 
+        /// Search for an item in the wrapped collection
+        /// </summary>
+        /// <param name="item">On entry the item to look for, on exit the equivalent item found (if any)</param>
+        /// <returns></returns>
+        public virtual bool Find(ref T item) { return collection.Find(ref item); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public virtual bool FindOrAdd(ref T item)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public virtual bool Update(T item)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="item"></param>
+        /// <param name="olditem"></param>
+        /// <returns></returns>
+        public virtual bool Update(T item, out T olditem)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public virtual bool UpdateOrAdd(T item)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="item"></param>
+        /// <param name="olditem"></param>
+        /// <returns></returns>
+        public virtual bool UpdateOrAdd(T item, out T olditem)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public virtual bool Remove(T item)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="item">The value to remove.</param>
+        /// <param name="removeditem">The removed value.</param>
+        /// <returns></returns>
+        public virtual bool Remove(T item, out T removeditem)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="item"></param>
+        public virtual void RemoveAllCopies(T item)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="items"></param>
+        public virtual void RemoveAll(System.Collections.Generic.IEnumerable<T> items)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        public virtual void Clear()
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="items"></param>
+        public virtual void RetainAll(System.Collections.Generic.IEnumerable<T> items)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+        /// <summary>
+        /// Check  wrapped collection for internal consistency
+        /// </summary>
+        /// <returns>True if check passed</returns>
+        public virtual bool Check() { return collection.Check(); }
+
+        #endregion
+
+        #region IExtensible<T> Members
+
+        /// <summary> </summary>
+        /// <value>False if wrapped collection has set semantics</value>
+        public virtual bool AllowsDuplicates { get { return collection.AllowsDuplicates; } }
+
+        //TODO: the equalityComparer should be guarded
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <value></value>
+        public virtual System.Collections.Generic.IEqualityComparer<T> EqualityComparer { get { return collection.EqualityComparer; } }
+
+        /// <summary>
+        /// By convention this is true for any collection with set semantics.
+        /// </summary>
+        /// <value>True if only one representative of a group of equal items 
+        /// is kept in the collection together with the total count.</value>
+        public virtual bool DuplicatesByCounting { get { return collection.DuplicatesByCounting; } }
+
+
+        /// <summary> </summary>
+        /// <value>True if wrapped collection is empty</value>
+        public override bool IsEmpty { get { return collection.IsEmpty; } }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public virtual bool Add(T item)
+        { throw new ReadOnlyCollectionException(); }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="item"></param>
+        void System.Collections.Generic.ICollection<T>.Add(T item)
+        { throw new ReadOnlyCollectionException(); }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="items"></param>
+        public virtual void AddAll(System.Collections.Generic.IEnumerable<T> items)
+        { throw new ReadOnlyCollectionException(); }
+
+        #endregion
+    }
+
+
+    /// <summary>
+    /// A read-only wrapper for a sequenced collection
+    ///
+    /// <i>This is mainly interesting as a base of other guard classes</i>
+    /// </summary>
+    [Serializable]
+    public class GuardedSequenced<T> : GuardedCollection<T>, ISequenced<T>
+    {
+        #region Fields
+
+        ISequenced<T> sequenced;
+
+        #endregion
+
+        #region Constructor
+
+        /// <summary>
+        /// Wrap a sequenced collection in a read-only wrapper
+        /// </summary>
+        /// <param name="sorted"></param>
+        public GuardedSequenced(ISequenced<T> sorted) : base(sorted) { this.sequenced = sorted; }
+
+        #endregion
+
+        /// <summary>
+        /// Check if there exists an item  that satisfies a
+        /// specific predicate in this collection and return the index of the first one.
+        /// </summary>
+        /// <param name="predicate">A delegate 
+        /// (<see cref="T:Func`2"/> with <code>R == bool</code>) defining the predicate</param>
+        /// <returns>the index, if found, a negative value else</returns>
+        public int FindIndex(Func<T, bool> predicate)
+        {
+            IIndexed<T> indexed = sequenced as IIndexed<T>;
+            if (indexed != null)
+                return indexed.FindIndex(predicate);
+            int index = 0;
+            foreach (T item in this)
+            {
+                if (predicate(item))
+                    return index;
+                index++;
+            }
+            return -1;
+        }
+
+        /// <summary>
+        /// Check if there exists an item  that satisfies a
+        /// specific predicate in this collection and return the index of the last one.
+        /// </summary>
+        /// <param name="predicate">A delegate 
+        /// (<see cref="T:Func`2"/> with <code>R == bool</code>) defining the predicate</param>
+        /// <returns>the index, if found, a negative value else</returns>
+        public int FindLastIndex(Func<T, bool> predicate)
+        {
+            IIndexed<T> indexed = sequenced as IIndexed<T>;
+            if (indexed != null)
+                return indexed.FindLastIndex(predicate);
+            int index = Count - 1;
+            foreach (T item in Backwards())
+            {
+                if (predicate(item))
+                    return index;
+                index--;
+            }
+            return -1;
+        }
+
+
+
+        #region ISequenced<T> Members
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <returns></returns>
+        public int GetSequencedHashCode()
+        { return sequenced.GetSequencedHashCode(); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="that"></param>
+        /// <returns></returns>
+        public bool SequencedEquals(ISequenced<T> that)
+        { return sequenced.SequencedEquals(that); }
+
+        #endregion
+
+        #region IDirectedCollection<T> Members
+
+        /// <summary>
+        /// Get a collection that enumerates the wrapped collection in the opposite direction
+        /// </summary>
+        /// <returns>The mirrored collection</returns>
+        public virtual IDirectedCollectionValue<T> Backwards()
+        { return new GuardedDirectedCollectionValue<T>(sequenced.Backwards()); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="predicate"></param>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public virtual bool FindLast(Func<T, bool> predicate, out T item) { return sequenced.FindLast(predicate, out item); }
+
+        #endregion
+
+        #region IDirectedEnumerable<T> Members
+
+        IDirectedEnumerable<T> IDirectedEnumerable<T>.Backwards()
+        { return Backwards(); }
+
+
+
+        /// <summary>
+        /// <code>Forwards</code> if same, else <code>Backwards</code>
+        /// </summary>
+        /// <value>The enumeration direction relative to the original collection.</value>
+        public EnumerationDirection Direction
+        { get { return EnumerationDirection.Forwards; } }
+
+        #endregion
+    }
+
+
+    /// <summary>
+    /// A read-only wrapper for a sorted collection
+    ///
+    /// <i>This is mainly interesting as a base of other guard classes</i>
+    /// </summary>
+    [Serializable]
+    public class GuardedSorted<T> : GuardedSequenced<T>, ISorted<T>
+    {
+        #region Fields
+
+        ISorted<T> sorted;
+
+        #endregion
+
+        #region Constructor
+
+        /// <summary>
+        /// Wrap a sorted collection in a read-only wrapper
+        /// </summary>
+        /// <param name="sorted"></param>
+        public GuardedSorted(ISorted<T> sorted) : base(sorted) { this.sorted = sorted; }
+
+        #endregion
+
+        #region ISorted<T> Members
+
+        /// <summary>
+        /// Find the strict predecessor of item in the guarded sorted collection,
+        /// that is, the greatest item in the collection smaller than the item.
+        /// </summary>
+        /// <param name="item">The item to find the predecessor for.</param>
+        /// <param name="res">The predecessor, if any; otherwise the default value for T.</param>
+        /// <returns>True if item has a predecessor; otherwise false.</returns>
+        public bool TryPredecessor(T item, out T res) { return sorted.TryPredecessor(item, out res); }
+
+
+        /// <summary>
+        /// Find the strict successor of item in the guarded sorted collection,
+        /// that is, the least item in the collection greater than the supplied value.
+        /// </summary>
+        /// <param name="item">The item to find the successor for.</param>
+        /// <param name="res">The successor, if any; otherwise the default value for T.</param>
+        /// <returns>True if item has a successor; otherwise false.</returns>
+        public bool TrySuccessor(T item, out T res) { return sorted.TrySuccessor(item, out res); }
+
+
+        /// <summary>
+        /// Find the weak predecessor of item in the guarded sorted collection,
+        /// that is, the greatest item in the collection smaller than or equal to the item.
+        /// </summary>
+        /// <param name="item">The item to find the weak predecessor for.</param>
+        /// <param name="res">The weak predecessor, if any; otherwise the default value for T.</param>
+        /// <returns>True if item has a weak predecessor; otherwise false.</returns>
+        public bool TryWeakPredecessor(T item, out T res) { return sorted.TryWeakPredecessor(item, out res); }
+
+
+        /// <summary>
+        /// Find the weak successor of item in the sorted collection,
+        /// that is, the least item in the collection greater than or equal to the supplied value.
+        /// </summary>
+        /// <param name="item">The item to find the weak successor for.</param>
+        /// <param name="res">The weak successor, if any; otherwise the default value for T.</param>
+        /// <returns>True if item has a weak successor; otherwise false.</returns>
+        public bool TryWeakSuccessor(T item, out T res) { return sorted.TryWeakSuccessor(item, out res); }
+
+
+        /// <summary>
+        /// Find the predecessor of the item in the wrapped sorted collection
+        /// </summary>
+        /// <exception cref="NoSuchItemException"> if no such element exists </exception>    
+        /// <param name="item">The item</param>
+        /// <returns>The predecessor</returns>
+        public T Predecessor(T item) { return sorted.Predecessor(item); }
+
+
+        /// <summary>
+        /// Find the Successor of the item in the wrapped sorted collection
+        /// </summary>
+        /// <exception cref="NoSuchItemException"> if no such element exists </exception>    
+        /// <param name="item">The item</param>
+        /// <returns>The Successor</returns>
+        public T Successor(T item) { return sorted.Successor(item); }
+
+
+        /// <summary>
+        /// Find the weak predecessor of the item in the wrapped sorted collection
+        /// </summary>
+        /// <exception cref="NoSuchItemException"> if no such element exists </exception>    
+        /// <param name="item">The item</param>
+        /// <returns>The weak predecessor</returns>
+        public T WeakPredecessor(T item) { return sorted.WeakPredecessor(item); }
+
+
+        /// <summary>
+        /// Find the weak Successor of the item in the wrapped sorted collection
+        /// </summary>
+        /// <exception cref="NoSuchItemException"> if no such element exists </exception>    
+        /// <param name="item">The item</param>
+        /// <returns>The weak Successor</returns>
+        public T WeakSuccessor(T item) { return sorted.WeakSuccessor(item); }
+
+
+        /// <summary>
+        /// Run Cut on the wrapped sorted collection
+        /// </summary>
+        /// <param name="c"></param>
+        /// <param name="low"></param>
+        /// <param name="lval"></param>
+        /// <param name="high"></param>
+        /// <param name="hval"></param>
+        /// <returns></returns>
+        public bool Cut(IComparable<T> c, out T low, out bool lval, out T high, out bool hval)
+        { return sorted.Cut(c, out low, out lval, out high, out hval); }
+
+
+        /// <summary>
+        /// Get the specified range from the wrapped collection. 
+        /// (The current implementation erroneously does not wrap the result.)
+        /// </summary>
+        /// <param name="bot"></param>
+        /// <returns></returns>
+        public IDirectedEnumerable<T> RangeFrom(T bot) { return sorted.RangeFrom(bot); }
+
+
+        /// <summary>
+        /// Get the specified range from the wrapped collection. 
+        /// (The current implementation erroneously does not wrap the result.)
+        /// </summary>
+        /// <param name="bot"></param>
+        /// <param name="top"></param>
+        /// <returns></returns>
+        public IDirectedEnumerable<T> RangeFromTo(T bot, T top)
+        { return sorted.RangeFromTo(bot, top); }
+
+
+        /// <summary>
+        /// Get the specified range from the wrapped collection. 
+        /// (The current implementation erroneously does not wrap the result.)
+        /// </summary>
+        /// <param name="top"></param>
+        /// <returns></returns>
+        public IDirectedEnumerable<T> RangeTo(T top) { return sorted.RangeTo(top); }
+
+
+        /// <summary>
+        /// Get the specified range from the wrapped collection. 
+        /// (The current implementation erroneously does not wrap the result.)
+        /// </summary>
+        /// <returns></returns>
+        public IDirectedCollectionValue<T> RangeAll() { return sorted.RangeAll(); }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="items"></param>
+        public void AddSorted(System.Collections.Generic.IEnumerable<T> items)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="low"></param>
+        public void RemoveRangeFrom(T low)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="low"></param>
+        /// <param name="hi"></param>
+        public void RemoveRangeFromTo(T low, T hi)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="hi"></param>
+        public void RemoveRangeTo(T hi)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+        #endregion
+
+        #region IPriorityQueue<T> Members
+
+        /// <summary>
+        /// Find the minimum of the wrapped collection
+        /// </summary>
+        /// <returns>The minimum</returns>
+        public T FindMin() { return sorted.FindMin(); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <returns></returns>
+        public T DeleteMin()
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+
+        /// <summary>
+        /// Find the maximum of the wrapped collection
+        /// </summary>
+        /// <returns>The maximum</returns>
+        public T FindMax() { return sorted.FindMax(); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <returns></returns>
+        public T DeleteMax()
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+        //TODO: we should guard the comparer!
+        /// <summary>
+        /// The comparer object supplied at creation time for the underlying collection
+        /// </summary>
+        /// <value>The comparer</value>
+        public System.Collections.Generic.IComparer<T> Comparer { get { return sorted.Comparer; } }
+        #endregion
+
+        #region IDirectedEnumerable<T> Members
+
+        IDirectedEnumerable<T> IDirectedEnumerable<T>.Backwards()
+        { return Backwards(); }
+
+        #endregion
+    }
+
+
+
+    /// <summary>
+    /// Read-only wrapper for indexed sorted collections
+    ///
+    /// <i>Suitable for wrapping TreeSet, TreeBag and SortedArray</i>
+    /// </summary>
+    [Serializable]
+    public class GuardedIndexedSorted<T> : GuardedSorted<T>, IIndexedSorted<T>
+    {
+        #region Fields
+
+        IIndexedSorted<T> indexedsorted;
+
+        #endregion
+
+        #region Constructor
+
+        /// <summary>
+        /// Wrap an indexed sorted collection in a read-only wrapper
+        /// </summary>
+        /// <param name="list">the indexed sorted collection</param>
+        public GuardedIndexedSorted(IIndexedSorted<T> list)
+            : base(list)
+        { this.indexedsorted = list; }
+
+        #endregion
+
+        #region IIndexedSorted<T> Members
+
+        /// <summary>
+        /// Get the specified range from the wrapped collection. 
+        /// (The current implementation erroneously does not wrap the result.)
+        /// </summary>
+        /// <param name="bot"></param>
+        /// <returns></returns>
+        public new IDirectedCollectionValue<T> RangeFrom(T bot)
+        { return indexedsorted.RangeFrom(bot); }
+
+
+        /// <summary>
+        /// Get the specified range from the wrapped collection. 
+        /// (The current implementation erroneously does not wrap the result.)
+        /// </summary>
+        /// <param name="bot"></param>
+        /// <param name="top"></param>
+        /// <returns></returns>
+        public new IDirectedCollectionValue<T> RangeFromTo(T bot, T top)
+        { return indexedsorted.RangeFromTo(bot, top); }
+
+
+        /// <summary>
+        /// Get the specified range from the wrapped collection. 
+        /// (The current implementation erroneously does not wrap the result.)
+        /// </summary>
+        /// <param name="top"></param>
+        /// <returns></returns>
+        public new IDirectedCollectionValue<T> RangeTo(T top)
+        { return indexedsorted.RangeTo(top); }
+
+
+        /// <summary>
+        /// Report the number of items in the specified range of the wrapped collection
+        /// </summary>
+        /// <param name="bot"></param>
+        /// <returns></returns>
+        public int CountFrom(T bot) { return indexedsorted.CountFrom(bot); }
+
+
+        /// <summary>
+        /// Report the number of items in the specified range of the wrapped collection
+        /// </summary>
+        /// <param name="bot"></param>
+        /// <param name="top"></param>
+        /// <returns></returns>
+        public int CountFromTo(T bot, T top) { return indexedsorted.CountFromTo(bot, top); }
+
+
+        /// <summary>
+        /// Report the number of items in the specified range of the wrapped collection
+        /// </summary>
+        /// <param name="top"></param>
+        /// <returns></returns>
+        public int CountTo(T top) { return indexedsorted.CountTo(top); }
+
+
+        /// <summary>
+        /// Run FindAll on the wrapped collection with the indicated filter.
+        /// The result will <b>not</b> be read-only.
+        /// </summary>
+        /// <param name="f"></param>
+        /// <returns></returns>
+        public IIndexedSorted<T> FindAll(Func<T, bool> f)
+        { return indexedsorted.FindAll(f); }
+
+
+        /// <summary>
+        /// Run Map on the wrapped collection with the indicated mapper.
+        /// The result will <b>not</b> be read-only.
+        /// </summary>
+        /// <param name="m"></param>
+        /// <param name="c">The comparer to use in the result</param>
+        /// <returns></returns>
+        public IIndexedSorted<V> Map<V>(Func<T, V> m, System.Collections.Generic.IComparer<V> c)
+        { return indexedsorted.Map(m, c); }
+
+        #endregion
+
+        #region IIndexed<T> Members
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <value>The i'th item of the wrapped sorted collection</value>
+        public T this[int i] { get { return indexedsorted[i]; } }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <value></value>
+        public virtual Speed IndexingSpeed { get { return indexedsorted.IndexingSpeed; } }
+
+        /// <summary> </summary>
+        /// <value>A directed collection of the items in the indicated interval of the wrapped collection</value>
+        public IDirectedCollectionValue<T> this[int start, int end]
+        { get { return new GuardedDirectedCollectionValue<T>(indexedsorted[start, end]); } }
+
+
+        /// <summary>
+        /// Find the (first) index of an item in the wrapped collection
+        /// </summary>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public int IndexOf(T item) { return indexedsorted.IndexOf(item); }
+
+
+        /// <summary>
+        /// Find the last index of an item in the wrapped collection
+        /// </summary>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public int LastIndexOf(T item) { return indexedsorted.LastIndexOf(item); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="i"></param>
+        /// <returns></returns>
+        public T RemoveAt(int i)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="start"></param>
+        /// <param name="count"></param>
+        public void RemoveInterval(int start, int count)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+        #endregion
+
+        #region IDirectedEnumerable<T> Members
+
+        IDirectedEnumerable<T> IDirectedEnumerable<T>.Backwards()
+        { return Backwards(); }
+
+        #endregion
+    }
+
+
+
+    /// <summary>
+    /// A read-only wrapper for a generic list collection
+    /// <i>Suitable as a wrapper for LinkedList, HashedLinkedList, ArrayList and HashedArray.
+    /// <see cref="T:C5.LinkedList`1"/>, 
+    /// <see cref="T:C5.HashedLinkedList`1"/>, 
+    /// <see cref="T:C5.ArrayList`1"/> or
+    /// <see cref="T:C5.HashedArray`1"/>.
+    /// </i>
+    /// </summary>
+    [Serializable]
+    public class GuardedList<T> : GuardedSequenced<T>, IList<T>, System.Collections.Generic.IList<T>
+    {
+        #region Fields
+
+        IList<T> innerlist;
+        GuardedList<T> underlying;
+        bool slidableView = false;
+
+        #endregion
+
+        #region Constructor
+
+        /// <summary>
+        /// Wrap a list in a read-only wrapper.  A list gets wrapped as read-only,
+        /// a list view gets wrapped as read-only and non-slidable.
+        /// </summary>
+        /// <param name="list">The list</param>
+        public GuardedList(IList<T> list)
+            : base(list)
+        {
+            this.innerlist = list;
+            // If wrapping a list view, make innerlist = the view, and make 
+            // underlying = a guarded version of the view's underlying list
+            if (list.Underlying != null)
+                underlying = new GuardedList<T>(list.Underlying, null, false);
+        }
+
+        GuardedList(IList<T> list, GuardedList<T> underlying, bool slidableView)
+            : base(list)
+        {
+            this.innerlist = list; this.underlying = underlying; this.slidableView = slidableView;
+        }
+        #endregion
+
+        #region IList<T> Members
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <value>The first item of the wrapped list</value>
+        public T First { get { return innerlist.First; } }
+
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <value>The last item of the wrapped list</value>
+        public T Last { get { return innerlist.Last; } }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> if used as setter</exception>
+        /// <value>True if wrapped list has FIFO semantics for the Add(T item) and Remove() methods</value>
+        public bool FIFO
+        {
+            get { return innerlist.FIFO; }
+            set { throw new ReadOnlyCollectionException("List is read only"); }
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        public virtual bool IsFixedSize
+        {
+            get { return true; }
+        }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> if used as setter</exception>
+        /// <value>The i'th item of the wrapped list</value>
+        public T this[int i]
+        {
+            get { return innerlist[i]; }
+            set { throw new ReadOnlyCollectionException("List is read only"); }
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <value></value>
+        public virtual Speed IndexingSpeed { get { return innerlist.IndexingSpeed; } }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="index"></param>
+        /// <param name="item"></param>
+        public void Insert(int index, T item)
+        { throw new ReadOnlyCollectionException(); }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="pointer"></param>
+        /// <param name="item"></param>
+        public void Insert(IList<T> pointer, T item)
+        { throw new ReadOnlyCollectionException(); }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="item"></param>
+        public void InsertFirst(T item)
+        { throw new ReadOnlyCollectionException("List is read only"); }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="item"></param>
+        public void InsertLast(T item)
+        { throw new ReadOnlyCollectionException("List is read only"); }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="item"></param>
+        /// <param name="target"></param>
+        public void InsertBefore(T item, T target)
+        { throw new ReadOnlyCollectionException("List is read only"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="item"></param>
+        /// <param name="target"></param>
+        public void InsertAfter(T item, T target)
+        { throw new ReadOnlyCollectionException("List is read only"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="i"></param>
+        /// <param name="items"></param>
+        public void InsertAll(int i, System.Collections.Generic.IEnumerable<T> items)
+        { throw new ReadOnlyCollectionException("List is read only"); }
+
+
+        /// <summary>
+        /// Perform FindAll on the wrapped list. The result is <b>not</b> necessarily read-only.
+        /// </summary>
+        /// <param name="filter">The filter to use</param>
+        /// <returns></returns>
+        public IList<T> FindAll(Func<T, bool> filter) { return innerlist.FindAll(filter); }
+
+
+        /// <summary>
+        /// Perform Map on the wrapped list. The result is <b>not</b> necessarily read-only.
+        /// </summary>
+        /// <typeparam name="V">The type of items of the new list</typeparam>
+        /// <param name="mapper">The mapper to use.</param>
+        /// <returns>The mapped list</returns>
+        public IList<V> Map<V>(Func<T, V> mapper) { return innerlist.Map(mapper); }
+
+        /// <summary>
+        /// Perform Map on the wrapped list. The result is <b>not</b> necessarily read-only.
+        /// </summary>
+        /// <typeparam name="V">The type of items of the new list</typeparam>
+        /// <param name="mapper">The delegate defining the map.</param>
+        /// <param name="itemequalityComparer">The itemequalityComparer to use for the new list</param>
+        /// <returns>The new list.</returns>
+        public IList<V> Map<V>(Func<T, V> mapper, System.Collections.Generic.IEqualityComparer<V> itemequalityComparer) { return innerlist.Map(mapper, itemequalityComparer); }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <returns></returns>
+        public T Remove() { throw new ReadOnlyCollectionException("List is read only"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <returns></returns>
+        public T RemoveFirst() { throw new ReadOnlyCollectionException("List is read only"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <returns></returns>
+        public T RemoveLast() { throw new ReadOnlyCollectionException("List is read only"); }
+
+
+        /// <summary>
+        /// Create the indicated view on the wrapped list and wrap it read-only.
+        /// </summary>
+        /// <param name="start"></param>
+        /// <param name="count"></param>
+        /// <returns></returns>
+        public IList<T> View(int start, int count)
+        {
+            IList<T> view = innerlist.View(start, count);
+            return view == null ? null : new GuardedList<T>(view, underlying ?? this, true);
+        }
+
+        /// <summary>
+        /// Create the indicated view on the wrapped list and wrap it read-only.
+        /// </summary>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public IList<T> ViewOf(T item)
+        {
+            IList<T> view = innerlist.ViewOf(item);
+            return view == null ? null : new GuardedList<T>(view, underlying ?? this, true);
+        }
+
+        /// <summary>
+        /// Create the indicated view on the wrapped list and wrap it read-only.
+        /// </summary>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public IList<T> LastViewOf(T item)
+        {
+            IList<T> view = innerlist.LastViewOf(item);
+            return view == null ? null : new GuardedList<T>(view, underlying ?? this, true);
+        }
+
+
+        /// <summary>
+        /// </summary>
+        /// <value>The wrapped underlying list of the wrapped view </value>
+        public IList<T> Underlying { get { return underlying; } }
+
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <value>The offset of the wrapped list as a view.</value>
+        public int Offset { get { return innerlist.Offset; } }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <value></value>
+        public virtual bool IsValid { get { return innerlist.IsValid; } }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> if this is a wrapped view and not a view that was made on a wrapper</exception>
+        /// <param name="offset"></param>
+        public IList<T> Slide(int offset)
+        {
+            if (slidableView)
+            {
+                innerlist.Slide(offset);
+                return this;
+            }
+            else
+                throw new ReadOnlyCollectionException("List is read only");
+        }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="offset"></param>
+        /// <param name="size"></param>
+        public IList<T> Slide(int offset, int size)
+        {
+            if (slidableView)
+            {
+                innerlist.Slide(offset, size);
+                return this;
+            }
+            else
+                throw new ReadOnlyCollectionException("List is read only");
+        }
+
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="offset"></param>
+        /// <returns></returns>
+        public bool TrySlide(int offset)
+        {
+            if (slidableView)
+                return innerlist.TrySlide(offset);
+            else
+                throw new ReadOnlyCollectionException("List is read only");
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="offset"></param>
+        /// <param name="size"></param>
+        /// <returns></returns>
+        public bool TrySlide(int offset, int size)
+        {
+            if (slidableView)
+                return innerlist.TrySlide(offset, size);
+            else
+                throw new ReadOnlyCollectionException("List is read only");
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="otherView"></param>
+        /// <returns></returns>
+        public IList<T> Span(IList<T> otherView)
+        {
+            GuardedList<T> otherGuardedList = otherView as GuardedList<T>;
+            if (otherGuardedList == null)
+                throw new IncompatibleViewException();
+            IList<T> span = innerlist.Span(otherGuardedList.innerlist);
+            if (span == null)
+                return null;
+            return new GuardedList<T>(span, underlying ?? otherGuardedList.underlying ?? this, true);
+        }
+
+        /// <summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// </summary>
+        public void Reverse() { throw new ReadOnlyCollectionException("List is read only"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="start"></param>
+        /// <param name="count"></param>
+        public void Reverse(int start, int count)
+        { throw new ReadOnlyCollectionException("List is read only"); }
+
+
+        /// <summary>
+        /// Check if wrapped list is sorted according to the default sorting order
+        /// for the item type T, as defined by the <see cref="T:C5.Comparer`1"/> class 
+        /// </summary>
+        /// <exception cref="NotComparableException">if T is not comparable</exception>
+        /// <returns>True if the list is sorted, else false.</returns>
+        public bool IsSorted() { return innerlist.IsSorted(System.Collections.Generic.Comparer<T>.Default); }
+
+        /// <summary>
+        /// Check if wrapped list is sorted
+        /// </summary>
+        /// <param name="c">The sorting order to use</param>
+        /// <returns>True if sorted</returns>
+        public bool IsSorted(System.Collections.Generic.IComparer<T> c) { return innerlist.IsSorted(c); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        public void Sort()
+        { throw new ReadOnlyCollectionException("List is read only"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="c"></param>
+        public void Sort(System.Collections.Generic.IComparer<T> c)
+        { throw new ReadOnlyCollectionException("List is read only"); }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        public void Shuffle()
+        { throw new ReadOnlyCollectionException("List is read only"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="rnd"></param>
+        public void Shuffle(Random rnd)
+        { throw new ReadOnlyCollectionException("List is read only"); }
+
+        #endregion
+
+        #region IIndexed<T> Members
+
+        /// <summary> </summary>
+        /// <value>A directed collection of the items in the indicated interval of the wrapped collection</value>
+        public IDirectedCollectionValue<T> this[int start, int end]
+        { get { return new GuardedDirectedCollectionValue<T>(innerlist[start, end]); } }
+
+
+        /// <summary>
+        /// Find the (first) index of an item in the wrapped collection
+        /// </summary>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public int IndexOf(T item) { return innerlist.IndexOf(item); }
+
+
+        /// <summary>
+        /// Find the last index of an item in the wrapped collection
+        /// </summary>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        public int LastIndexOf(T item) { return innerlist.LastIndexOf(item); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="i"></param>
+        /// <returns></returns>
+        public T RemoveAt(int i)
+        { throw new ReadOnlyCollectionException("List is read only"); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="start"></param>
+        /// <param name="count"></param>
+        public void RemoveInterval(int start, int count)
+        { throw new ReadOnlyCollectionException("List is read only"); }
+
+        #endregion
+
+        #region IDirectedEnumerable<T> Members
+
+        IDirectedEnumerable<T> IDirectedEnumerable<T>.Backwards()
+        { return Backwards(); }
+
+        #endregion
+
+        #region IStack<T> Members
+
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <returns>-</returns>
+        public void Push(T item)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <returns>-</returns>
+        public T Pop()
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+        #endregion
+
+        #region IQueue<T> Members
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <returns>-</returns>
+        public void Enqueue(T item)
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <returns>-</returns>
+        public T Dequeue()
+        { throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object"); }
+
+        #endregion
+
+        #region IDisposable Members
+
+        /// <summary>
+        /// Ignore: this may be called by a foreach or using statement.
+        /// </summary>
+        public void Dispose() { }
+
+        #endregion
+
+        #region System.Collections.Generic.IList<T> Members
+
+        void System.Collections.Generic.IList<T>.RemoveAt(int index)
+        {
+            throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object");
+        }
+
+        void System.Collections.Generic.ICollection<T>.Add(T item)
+        {
+            throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object");
+        }
+
+        #endregion
+
+        #region System.Collections.ICollection Members
+
+        bool System.Collections.ICollection.IsSynchronized
+        {
+            get { return false; }
+        }
+
+        [Obsolete]
+        Object System.Collections.ICollection.SyncRoot
+        {
+            get { return innerlist.SyncRoot; }
+        }
+
+        void System.Collections.ICollection.CopyTo(Array arr, int index)
+        {
+            if (index < 0 || index + Count > arr.Length)
+                throw new ArgumentOutOfRangeException();
+
+            foreach (T item in this)
+                arr.SetValue(item, index++);
+        }
+
+        #endregion
+
+        #region System.Collections.IList Members
+
+        Object System.Collections.IList.this[int index]
+        {
+            get { return this[index]; }
+            set
+            {
+                throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object");
+            }
+        }
+
+        int System.Collections.IList.Add(Object o)
+        {
+            throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object");
+        }
+
+        bool System.Collections.IList.Contains(Object o)
+        {
+            return Contains((T)o);
+        }
+
+        int System.Collections.IList.IndexOf(Object o)
+        {
+            return Math.Max(-1, IndexOf((T)o));
+        }
+
+        void System.Collections.IList.Insert(int index, Object o)
+        {
+            throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object");
+        }
+
+        void System.Collections.IList.Remove(Object o)
+        {
+            throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object");
+        }
+
+        void System.Collections.IList.RemoveAt(int index)
+        {
+            throw new ReadOnlyCollectionException("Collection cannot be modified through this guard object");
+        }
+
+        #endregion
+    }
+
+    /// <summary>
+    /// A read-only wrapper for a generic indexable queue (allows indexing).
+    /// 
+    /// <para>Suitable for wrapping a <see cref="T:C5.CircularQueue`1"/></para>
+    /// </summary>
+    /// <typeparam name="T">The item type.</typeparam>
+    [Serializable]
+    public class GuardedQueue<T> : GuardedDirectedCollectionValue<T>, IQueue<T>
+    {
+        #region Fields
+
+        IQueue<T> queue;
+
+        #endregion
+
+        #region Constructor
+
+        /// <summary>
+        /// Wrap a queue in a read-only wrapper
+        /// </summary>
+        /// <param name="queue">The queue</param>
+        public GuardedQueue(IQueue<T> queue) : base(queue) { this.queue = queue; }
+
+        #endregion
+
+        #region IQueue<T> Members
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <value></value>
+        public bool AllowsDuplicates { get { return queue.AllowsDuplicates; } }
+
+        /// <summary>
+        /// Index into the wrapped queue
+        /// </summary>
+        /// <param name="i"></param>
+        /// <returns></returns>
+        public T this[int i] { get { return queue[i]; } }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <returns>-</returns>
+        public void Enqueue(T item)
+        { throw new ReadOnlyCollectionException("Queue cannot be modified through this guard object"); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <returns>-</returns>
+        public T Dequeue()
+        { throw new ReadOnlyCollectionException("Queue cannot be modified through this guard object"); }
+
+        #endregion
+    }
+
+    /// <summary>
+    /// A read-only wrapper for a dictionary.
+    ///
+    /// <i>Suitable for wrapping a HashDictionary. <see cref="T:C5.HashDictionary`2"/></i>
+    /// </summary>
+    [Serializable]
+    public class GuardedDictionary<K, V> : GuardedCollectionValue<KeyValuePair<K, V>>, IDictionary<K, V>
+    {
+        #region Fields
+
+        IDictionary<K, V> dict;
+
+        #endregion
+
+        #region Constructor
+
+        /// <summary>
+        /// Wrap a dictionary in a read-only wrapper
+        /// </summary>
+        /// <param name="dict">the dictionary</param>
+        public GuardedDictionary(IDictionary<K, V> dict) : base(dict) { this.dict = dict; }
+
+        #endregion
+
+        #region IDictionary<K,V> Members
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <value></value>
+        public System.Collections.Generic.IEqualityComparer<K> EqualityComparer { get { return dict.EqualityComparer; } }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a
+        /// read-only wrapper if used as a setter</exception>
+        /// <value>Get the value corresponding to a key in the wrapped dictionary</value>
+        public V this[K key]
+        {
+            get { return dict[key]; }
+            set { throw new ReadOnlyCollectionException(); }
+        }
+
+        /// <summary>
+        /// (This is a read-only wrapper)
+        /// </summary>
+        /// <value>True</value>
+        public bool IsReadOnly { get { return true; } }
+
+
+        //TODO: guard with a read-only wrapper? Probably so!
+        /// <summary> </summary>
+        /// <value>The collection of keys of the wrapped dictionary</value>
+        public ICollectionValue<K> Keys
+        { get { return dict.Keys; } }
+
+
+        /// <summary> </summary>
+        /// <value>The collection of values of the wrapped dictionary</value>
+        public ICollectionValue<V> Values { get { return dict.Values; } }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        public virtual Func<K, V> Func { get { return delegate (K k) { return this[k]; }; } }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="key"></param>
+        /// <param name="val"></param>
+        public void Add(K key, V val)
+        { throw new ReadOnlyCollectionException(); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="items"></param>
+        public void AddAll<L, W>(System.Collections.Generic.IEnumerable<KeyValuePair<L, W>> items)
+            where L : K
+            where W : V
+        { throw new ReadOnlyCollectionException(); }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="key"></param>
+        /// <returns></returns>
+        public bool Remove(K key)
+        { throw new ReadOnlyCollectionException(); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="key"></param>
+        /// <param name="val"></param>
+        /// <returns></returns>
+        public bool Remove(K key, out V val)
+        { throw new ReadOnlyCollectionException(); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        public void Clear()
+        { throw new ReadOnlyCollectionException(); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <value></value>
+        public Speed ContainsSpeed { get { return dict.ContainsSpeed; } }
+
+        /// <summary>
+        /// Check if the wrapped dictionary contains a specific key
+        /// </summary>
+        /// <param name="key">The key</param>
+        /// <returns>True if it does</returns>
+        public bool Contains(K key) { return dict.Contains(key); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="keys"></param>
+        /// <returns></returns>
+        public bool ContainsAll<H>(System.Collections.Generic.IEnumerable<H> keys) where H : K { return dict.ContainsAll(keys); }
+
+        /// <summary>
+        /// Search for a key in the wrapped dictionary, reporting the value if found
+        /// </summary>
+        /// <param name="key">The key</param>
+        /// <param name="val">On exit: the value if found</param>
+        /// <returns>True if found</returns>
+        public bool Find(ref K key, out V val) { return dict.Find(ref key, out val); }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="key"></param>
+        /// <param name="val"></param>
+        /// <returns></returns>
+        public bool Update(K key, V val)
+        { throw new ReadOnlyCollectionException(); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="key"></param>
+        /// <param name="val"></param>
+        /// <param name="oldval"></param>
+        /// <returns></returns>
+        public bool Update(K key, V val, out V oldval)
+        { throw new ReadOnlyCollectionException(); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="key"></param>
+        /// <param name="val"></param>
+        /// <returns></returns>
+        public bool FindOrAdd(K key, ref V val)
+        { throw new ReadOnlyCollectionException(); }
+
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="key"></param>
+        /// <param name="val"></param>
+        /// <returns></returns>
+        public bool UpdateOrAdd(K key, V val)
+        { throw new ReadOnlyCollectionException(); }
+
+        /// <summary>
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="key"></param>
+        /// <param name="val"></param>
+        /// <param name="oldval"></param>
+        /// <returns></returns>
+        public bool UpdateOrAdd(K key, V val, out V oldval)
+        { throw new ReadOnlyCollectionException(); }
+
+
+        /// <summary>
+        /// Check the internal consistency of the wrapped dictionary
+        /// </summary>
+        /// <returns>True if check passed</returns>
+        public bool Check() { return dict.Check(); }
+
+        #endregion
+    }
+
+
+
+    /// <summary>
+    /// A read-only wrapper for a sorted dictionary.
+    ///
+    /// <i>Suitable for wrapping a Dictionary. <see cref="T:C5.Dictionary`2"/></i>
+    /// </summary>
+    [Serializable]
+    public class GuardedSortedDictionary<K, V> : GuardedDictionary<K, V>, ISortedDictionary<K, V>
+    {
+        #region Fields
+
+        ISortedDictionary<K, V> sorteddict;
+
+        #endregion
+
+        #region Constructor
+
+        /// <summary>
+        /// Wrap a sorted dictionary in a read-only wrapper
+        /// </summary>
+        /// <param name="sorteddict">the dictionary</param>
+        public GuardedSortedDictionary(ISortedDictionary<K, V> sorteddict)
+            : base(sorteddict)
+        { this.sorteddict = sorteddict; }
+
+        #endregion
+
+        #region ISortedDictionary<K,V> Members
+
+        /// <summary>
+        /// The key comparer used by this dictionary.
+        /// </summary>
+        /// <value></value>
+        public System.Collections.Generic.IComparer<K> Comparer { get { return sorteddict.Comparer; } }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <value></value>
+        public new ISorted<K> Keys { get { return null; } }
+
+        /// <summary>
+        /// Find the entry in the dictionary whose key is the
+        /// predecessor of the specified key.
+        /// </summary>
+        /// <param name="key">The key</param>
+        /// <param name="res">The predecessor, if any</param>
+        /// <returns>True if key has a predecessor</returns>
+        public bool TryPredecessor(K key, out KeyValuePair<K, V> res)
+        {
+            return sorteddict.TryPredecessor(key, out res);
+        }
+
+        /// <summary>
+        /// Find the entry in the dictionary whose key is the
+        /// successor of the specified key.
+        /// </summary>
+        /// <param name="key">The key</param>
+        /// <param name="res">The successor, if any</param>
+        /// <returns>True if the key has a successor</returns>
+        public bool TrySuccessor(K key, out KeyValuePair<K, V> res)
+        {
+            return sorteddict.TrySuccessor(key, out res);
+        }
+
+        /// <summary>
+        /// Find the entry in the dictionary whose key is the
+        /// weak predecessor of the specified key.
+        /// </summary>
+        /// <param name="key">The key</param>
+        /// <param name="res">The predecessor, if any</param>
+        /// <returns>True if key has a weak predecessor</returns>
+        public bool TryWeakPredecessor(K key, out KeyValuePair<K, V> res)
+        {
+            return sorteddict.TryWeakPredecessor(key, out res);
+        }
+
+        /// <summary>
+        /// Find the entry in the dictionary whose key is the
+        /// weak successor of the specified key.
+        /// </summary>
+        /// <param name="key">The key</param>
+        /// <param name="res">The weak successor, if any</param>
+        /// <returns>True if the key has a weak successor</returns>
+        public bool TryWeakSuccessor(K key, out KeyValuePair<K, V> res)
+        {
+            return sorteddict.TryWeakSuccessor(key, out res);
+        }
+
+        /// <summary>
+        /// Get the entry in the wrapped dictionary whose key is the
+        /// predecessor of a specified key.
+        /// </summary>
+        /// <exception cref="NoSuchItemException"> if no such entry exists </exception>    
+        /// <param name="key">The key</param>
+        /// <returns>The entry</returns>
+        public KeyValuePair<K, V> Predecessor(K key)
+        { return sorteddict.Predecessor(key); }
+
+        /// <summary>
+        /// Get the entry in the wrapped dictionary whose key is the
+        /// successor of a specified key.
+        /// </summary>
+        /// <exception cref="NoSuchItemException"> if no such entry exists </exception>    
+        /// <param name="key">The key</param>
+        /// <returns>The entry</returns>
+        public KeyValuePair<K, V> Successor(K key)
+        { return sorteddict.Successor(key); }
+
+
+        /// <summary>
+        /// Get the entry in the wrapped dictionary whose key is the
+        /// weak predecessor of a specified key.
+        /// </summary>
+        /// <exception cref="NoSuchItemException"> if no such entry exists </exception>    
+        /// <param name="key">The key</param>
+        /// <returns>The entry</returns>
+        public KeyValuePair<K, V> WeakPredecessor(K key)
+        { return sorteddict.WeakPredecessor(key); }
+
+
+        /// <summary>
+        /// Get the entry in the wrapped dictionary whose key is the
+        /// weak successor of a specified key.
+        /// </summary>
+        /// <exception cref="NoSuchItemException"> if no such entry exists </exception>    
+        /// <param name="key">The key</param>
+        /// <returns>The entry</returns>
+        public KeyValuePair<K, V> WeakSuccessor(K key)
+        { return sorteddict.WeakSuccessor(key); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <returns></returns>
+        public KeyValuePair<K, V> FindMin()
+        {
+            return sorteddict.FindMin();
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <returns></returns>
+        public KeyValuePair<K, V> DeleteMin()
+        { throw new ReadOnlyCollectionException(); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <returns></returns>
+        public KeyValuePair<K, V> FindMax()
+        {
+            return sorteddict.FindMax();
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <returns></returns>
+        public KeyValuePair<K, V> DeleteMax()
+        { throw new ReadOnlyCollectionException(); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="c"></param>
+        /// <param name="lowEntry"></param>
+        /// <param name="lowIsValid"></param>
+        /// <param name="highEntry"></param>
+        /// <param name="highIsValid"></param>
+        /// <returns></returns>
+        public bool Cut(IComparable<K> c, out KeyValuePair<K, V> lowEntry, out bool lowIsValid, out KeyValuePair<K, V> highEntry, out bool highIsValid)
+        {
+            return sorteddict.Cut(c, out lowEntry, out lowIsValid, out highEntry, out highIsValid); ;
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="bot"></param>
+        /// <returns></returns>
+        public IDirectedEnumerable<KeyValuePair<K, V>> RangeFrom(K bot)
+        {
+            return new GuardedDirectedEnumerable<KeyValuePair<K, V>>(sorteddict.RangeFrom(bot));
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="bot"></param>
+        /// <param name="top"></param>
+        /// <returns></returns>
+        public IDirectedEnumerable<KeyValuePair<K, V>> RangeFromTo(K bot, K top)
+        {
+            return new GuardedDirectedEnumerable<KeyValuePair<K, V>>(sorteddict.RangeFromTo(bot, top));
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="top"></param>
+        /// <returns></returns>
+        public IDirectedEnumerable<KeyValuePair<K, V>> RangeTo(K top)
+        {
+            return new GuardedDirectedEnumerable<KeyValuePair<K, V>>(sorteddict.RangeTo(top));
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <returns></returns>
+        public IDirectedCollectionValue<KeyValuePair<K, V>> RangeAll()
+        {
+            return new GuardedDirectedCollectionValue<KeyValuePair<K, V>>(sorteddict.RangeAll());
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="items"></param>
+        public void AddSorted(System.Collections.Generic.IEnumerable<KeyValuePair<K, V>> items)
+        { throw new ReadOnlyCollectionException(); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="low"></param>
+        public void RemoveRangeFrom(K low)
+        { throw new ReadOnlyCollectionException(); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="low"></param>
+        /// <param name="hi"></param>
+        public void RemoveRangeFromTo(K low, K hi)
+        { throw new ReadOnlyCollectionException(); }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <exception cref="ReadOnlyCollectionException"> since this is a read-only wrapper</exception>
+        /// <param name="hi"></param>
+        public void RemoveRangeTo(K hi)
+        { throw new ReadOnlyCollectionException(); }
+
+        #endregion
+    }
+
+}
\ No newline at end of file


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