//******************************
// Written by Peter Golde
// Copyright (c) 2004-2005, Wintellect
//
// Use and restribution of this code is subject to the license agreement 
// contained in the file "License.txt" accompanying this file.
//******************************

using System;
using System.Collections;
using System.Collections.Generic;

namespace Wintellect.PowerCollections
{
    /// <summary>
    /// ListBase is an abstract class that can be used as a base class for a read-write collection that needs 
    /// to implement the generic IList&lt;T&gt; and non-generic IList collections. The derived class needs
    /// to override the following methods: Count, Clear, Insert, RemoveAt, and the indexer. The implementation
    /// of all the other methods in IList&lt;T&gt; and IList are handled by ListBase.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    [Serializable]
    public abstract class ListBase<T> : CollectionBase<T>, IList<T>, IList
    {
        /// <summary>
        /// Creates a new ListBase.
        /// </summary>
        protected ListBase()
        {
        }

        /// <summary>
        /// The property must be overridden by the derived class to return the number of 
        /// items in the list.
        /// </summary>
        /// <value>The number of items in the list.</value>
        public abstract override int Count { get;} 

        /// <summary>
        /// This method must be overridden by the derived class to empty the list
        /// of all items.
        /// </summary>
        public abstract override void Clear();

        /// <summary>
        /// The indexer must be overridden by the derived class to get and set
        /// values of the list at a particular index.
        /// </summary>
        /// <param name="index">The index in the list to get or set an item at. The
        /// first item in the list has index 0, and the last has index Count-1.</param>
        /// <returns>The item at the given index.</returns>
        /// <exception cref="ArgumentOutOfRangeException"><paramref name="index"/> is
        /// less than zero or greater than or equal to Count.</exception>
        public abstract T this[int index]
        {
            get;
            set;
        }

        /// <summary>
        /// This method must be overridden by the derived class to insert a new
        /// item at the given index. 
        /// </summary>
        /// <param name="index">The index in the list to insert the item at. After the
        /// insertion, the inserted item is located at this index. The
        /// first item in the list has index 0.</param>
        /// <param name="item">The item to insert at the given index.</param>
        /// <exception cref="ArgumentOutOfRangeException"><paramref name="index"/> is
        /// less than zero or greater than Count.</exception>
        public abstract void Insert(int index, T item);

        /// <summary>
        /// This method must be overridden by the derived class to remove the
        /// item at the given index. 
        /// </summary>
        /// <param name="index">The index in the list to remove the item at. The
        /// first item in the list has index 0.</param>
        /// <exception cref="ArgumentOutOfRangeException"><paramref name="index"/> is
        /// less than zero or greater than or equal to Count.</exception>
        public abstract void RemoveAt(int index);

        /// <summary>
        /// Enumerates all of the items in the list, in order. The item at index 0
        /// is enumerated first, then the item at index 1, and so on.
        /// </summary>
        /// <remarks>The enumerator does not check for changes made
        /// to the structure of the list. Thus, changes to the list during
        /// enumeration may cause incorrect enumeration or out of range
        /// exceptions. Consider overriding this method and adding checks
        /// for structural changes.</remarks>
        /// <returns>An IEnumerator&lt;T&gt; that enumerates all the
        /// items in the list.</returns>
        public override IEnumerator<T> GetEnumerator()
        {
            int count = Count;
            for (int i = 0; i < count; ++i) {
                yield return this[i];
            }
        }

        /// <summary>
        /// Determines if the list contains any item that compares equal to <paramref name="item"/>.
        /// The implementation simply checks whether IndexOf(item) returns a non-negative value.
        /// </summary>
        /// <remarks>Equality in the list is determined by the default sense of
        /// equality for T. If T implements IComparable&lt;T&gt;, the
        /// Equals method of that interface is used to determine equality. Otherwise, 
        /// Object.Equals is used to determine equality.</remarks>
        /// <param name="item">The item to search for.</param>
        /// <returns>True if the list contains an item that compares equal to <paramref name="item"/>.</returns>
        public override bool Contains(T item)
        {
            return (IndexOf(item) >= 0);
        }

        /// <summary>
        /// Adds an item to the end of the list. This method is equivalent to calling: 
        /// <code>Insert(Count, item)</code>
        /// </summary>
        /// <param name="item">The item to add to the list.</param>
        public override void Add(T item)
        {
            Insert(Count, item);
        }

        /// <summary>
        /// Searches the list for the first item that compares equal to <paramref name="item"/>.
        /// If one is found, it is removed. Otherwise, the list is unchanged.
        /// </summary>
        /// <remarks>Equality in the list is determined by the default sense of
        /// equality for T. If T implements IComparable&lt;T&gt;, the
        /// Equals method of that interface is used to determine equality. Otherwise, 
        /// Object.Equals is used to determine equality.</remarks>
        /// <param name="item">The item to remove from the list.</param>
        /// <returns>True if an item was found and removed that compared equal to
        /// <paramref name="item"/>. False if no such item was in the list.</returns>
        public override bool Remove(T item)
        {
            int index = IndexOf(item);
            if (index >= 0) {
                RemoveAt(index);
                return true;
            }
            else {
                return false;
            }
        }

        /// <summary>
        /// Copies all the items in the list, in order, to <paramref name="array"/>,
        /// starting at index 0.
        /// </summary>
        /// <param name="array">The array to copy to. This array must have a size
        /// that is greater than or equal to Count.</param>
        public virtual void CopyTo(T[] array)
        {
            this.CopyTo(array, 0);
        }

        /// <summary>
        /// Copies all the items in the list, in order, to <paramref name="array"/>,
        /// starting at <paramref name="arrayIndex"/>.
        /// </summary>
        /// <param name="array">The array to copy to. This array must have a size
        /// that is greater than or equal to Count + arrayIndex.</param>
        /// <param name="arrayIndex">The starting index in <paramref name="array"/>
        /// to copy to.</param>
        public override void CopyTo(T[] array, int arrayIndex)
        {
            base.CopyTo(array, arrayIndex);
        }

        /// <summary>
        /// Copies a range of elements from the list to <paramref name="array"/>,
        /// starting at <paramref name="arrayIndex"/>.
        /// </summary>
        /// <param name="index">The starting index in the source list of the range to copy.</param>
        /// <param name="array">The array to copy to. This array must have a size
        /// that is greater than or equal to Count + arrayIndex.</param>
        /// <param name="arrayIndex">The starting index in <paramref name="array"/>
        /// to copy to.</param>
        /// <param name="count">The number of items to copy.</param>
        public virtual void CopyTo(int index, T[] array, int arrayIndex, int count)
        {
            Range(index, count).CopyTo(array, arrayIndex);
        }

        /// <summary>
        /// Provides a read-only view of this list. The returned IList&lt;T&gt; provides
        /// a view of the list that prevents modifications to the list. Use the method to provide
        /// access to the list without allowing changes. Since the returned object is just a view,
        /// changes to the list will be reflected in the view.
        /// </summary>
        /// <returns>An IList&lt;T&gt; that provides read-only access to the list.</returns>
        public virtual new IList<T> AsReadOnly()
        {
            return Algorithms.ReadOnly<T>(this);
        }

        /// <summary>
        /// Finds the first item in the list that satisfies the condition
        /// defined by <paramref name="predicate"/>. If no item matches the condition, than
        /// the default value for T (null or all-zero) is returned.
        /// </summary>
        /// <remarks>If the default value for T (null or all-zero) matches the condition defined by <paramref name="predicate"/>,
        /// and the list might contain the default value, then it is impossible to distinguish the different between finding
        /// the default value and not finding any item. To distinguish these cases, use <see cref="TryFind"/>.</remarks>
        /// <param name="predicate">A delegate that defined the condition to check for.</param>
        /// <returns>The first item that satisfies the condition <paramref name="predicate"/>. If no item satisfies that
        /// condition, the default value for T is returned.</returns>
        /// <seealso cref="TryFind"/>
        public virtual T Find(Predicate<T> predicate)
        {
            return Algorithms.FindFirstWhere(this, predicate);
        }

        /// <summary>
        /// Finds the first item in the list that satisfies the condition
        /// defined by <paramref name="predicate"/>. 
        /// </summary>
        /// <param name="predicate">A delegate that defines the condition to check for.</param>
        /// <param name="foundItem">If true is returned, this parameter receives the first item in the list
        /// that satifies the condition defined by <paramref name="predicate"/>.</param>
        /// <returns>True if an item that  satisfies the condition <paramref name="predicate"/> was found. False 
        /// if no item in the list satisfies that condition.</returns>
        public virtual bool TryFind(Predicate<T> predicate, out T foundItem)
        {
            return Algorithms.TryFindFirstWhere<T>(this, predicate, out foundItem);
        }

        /// <summary>
        /// Finds the last item in the list that satisfies the condition
        /// defined by <paramref name="predicate"/>. If no item matches the condition, than
        /// the default value for T (null or all-zero) is returned.
        /// </summary>
        /// <remarks>If the default value for T (null or all-zero) matches the condition defined by <paramref name="predicate"/>,
        /// and the list might contain the default value, then it is impossible to distinguish the different between finding
        /// the default value and not finding any item. To distinguish these cases, use <see cref="TryFindLast"/>.</remarks>
        /// <param name="predicate">A delegate that defined the condition to check for.</param>
        /// <returns>The last item that satisfies the condition <paramref name="predicate"/>. If no item satisfies that
        /// condition, the default value for T is returned.</returns>
        /// <seealso cref="TryFindLast"/>
        public virtual T FindLast(Predicate<T> predicate)
        {
            return Algorithms.FindLastWhere(this, predicate);
        }

        /// <summary>
        /// Finds the last item in the list that satisfies the condition
        /// defined by <paramref name="predicate"/>. 
        /// </summary>
        /// <param name="predicate">A delegate that defines the condition to check for.</param>
        /// <param name="foundItem">If true is returned, this parameter receives the last item in the list
        /// that satifies the condition defined by <paramref name="predicate"/>.</param>
        /// <returns>True if an item that  satisfies the condition <paramref name="predicate"/> was found. False 
        /// if no item in the list satisfies that condition.</returns>
        public virtual bool TryFindLast(Predicate<T> predicate, out T foundItem)
        {
            return Algorithms.TryFindLastWhere<T>(this, predicate, out foundItem);
        }

        /// <summary>
        /// Finds the index of the first item in the list that satisfies the condition
        /// defined by <paramref name="predicate"/>. If no item matches the condition, -1 is returned.
        /// </summary>
        /// <param name="predicate">A delegate that defined the condition to check for.</param>
        /// <returns>The index of the first item that satisfies the condition <paramref name="predicate"/>. If no item satisfies that
        /// condition, -1 is returned.</returns>
        public virtual int FindIndex(Predicate<T> predicate)
        {
            return Algorithms.FindFirstIndexWhere<T>(this, predicate);
        }

        /// <summary>
        /// Finds the index of the first item, in the range of items extending from <paramref name="index"/> to the end, that satisfies the condition
        /// defined by <paramref name="predicate"/>. If no item matches the condition, -1 is returned.
        /// </summary>
        /// <param name="predicate">A delegate that defined the condition to check for.</param>
        /// <param name="index">The starting index of the range to check.</param>
        /// <returns>The index of the first item in the given range that satisfies the condition <paramref name="predicate"/>. If no item satisfies that
        /// condition, -1 is returned.</returns>
        public virtual int FindIndex(int index, Predicate<T> predicate)
        {
            int foundIndex = Algorithms.FindFirstIndexWhere<T>(Range(index, Count - index), predicate);
            if (foundIndex < 0)
                return -1;
            else
                return foundIndex + index;
        }

        /// <summary>
        /// Finds the index of the first item, in the range of <paramref name="count"/> items starting from <paramref name="index"/>, that satisfies the condition
        /// defined by <paramref name="predicate"/>. If no item matches the condition, -1 is returned.
        /// </summary>
        /// <param name="predicate">A delegate that defined the condition to check for.</param>
        /// <param name="index">The starting index of the range to check.</param>
        /// <param name="count">The number of items in range to check.</param>
        /// <returns>The index of the first item in the given range that satisfies the condition <paramref name="predicate"/>. If no item satisfies that
        /// condition, -1 is returned.</returns>
        public virtual int FindIndex(int index, int count, Predicate<T> predicate)
        {
            int foundIndex = Algorithms.FindFirstIndexWhere<T>(Range(index, count), predicate);
            if (foundIndex < 0)
                return -1;
            else
                return foundIndex + index;
        }

        /// <summary>
        /// Finds the index of the last item in the list that satisfies the condition
        /// defined by <paramref name="predicate"/>. If no item matches the condition, -1 is returned.
        /// </summary>
        /// <param name="predicate">A delegate that defined the condition to check for.</param>
        /// <returns>The index of the last item that satisfies the condition <paramref name="predicate"/>. If no item satisfies that
        /// condition, -1 is returned.</returns>
        public virtual int FindLastIndex(Predicate<T> predicate)
        {
            return Algorithms.FindLastIndexWhere<T>(this, predicate);
        }

        /// <summary>
        /// Finds the index of the last item, in the range of items extending from the beginning
        /// of the list to <paramref name="index"/>, that satisfies the condition
        /// defined by <paramref name="predicate"/>. If no item matches the condition, -1 is returned.
        /// </summary>
        /// <param name="predicate">A delegate that defined the condition to check for.</param>
        /// <param name="index">The ending index of the range to check.</param>
        /// <returns>The index of the last item in the given range that satisfies the condition <paramref name="predicate"/>. If no item satisfies that
        /// condition, -1 is returned.</returns>
        public virtual int FindLastIndex(int index, Predicate<T> predicate)
        {
            return Algorithms.FindLastIndexWhere<T>(Range(0, index + 1), predicate);
        }

        /// <summary>
        /// Finds the index of the last item, in the range of <paramref name="count"/> items ending at <paramref name="index"/>, that satisfies the condition
        /// defined by <paramref name="predicate"/>. If no item matches the condition, -1 is returned.
        /// </summary>
        /// <param name="predicate">A delegate that defined the condition to check for.</param>
        /// <param name="index">The ending index of the range to check.</param>
        /// <param name="count">The number of items in range to check.</param>
        /// <returns>The index of the last item in the given range that satisfies the condition <paramref name="predicate"/>. If no item satisfies that
        /// condition, -1 is returned.</returns>
        public virtual int FindLastIndex(int index, int count, Predicate<T> predicate)
        {
            int foundIndex = Algorithms.FindLastIndexWhere<T>(Range(index - count + 1, count), predicate);

            if (foundIndex >= 0)
                return foundIndex + index - count + 1;
            else
                return -1;
        }

        /// <summary>
        /// Finds the index of the first item in the list that is equal to <paramref name="item"/>. 
        /// </summary>
        /// <remarks>The default implementation of equality for type T is used in the search. This is the
        /// equality defined by IComparable&lt;T&gt; or object.Equals.</remarks>
        /// <param name="item">The item to search fror.</param>
        /// <returns>The index of the first item in the list that that is equal to <paramref name="item"/>.  If no item is equal
        /// to <paramref name="item"/>, -1 is returned.</returns>
        public virtual int IndexOf(T item)
        {
            return Algorithms.FirstIndexOf<T>(this, item, EqualityComparer<T>.Default);
        }

        /// <summary>
        /// Finds the index of the first item, in the range of items extending from <paramref name="index"/> to the end,  
        /// that is equal to <paramref name="item"/>. 
        /// </summary>
        /// <remarks>The default implementation of equality for type T is used in the search. This is the
        /// equality defined by IComparable&lt;T&gt; or object.Equals.</remarks>
        /// <param name="item">The item to search fror.</param>
        /// <param name="index">The starting index of the range to check.</param>
        /// <returns>The index of the first item in the given range that that is equal to <paramref name="item"/>.  If no item is equal
        /// to <paramref name="item"/>, -1 is returned.</returns>
        public virtual int IndexOf(T item, int index)
        {
            int foundIndex = Algorithms.FirstIndexOf<T>(Range(index, Count - index), item, EqualityComparer<T>.Default);

            if (foundIndex >= 0)
                return foundIndex + index;
            else
                return -1;
        }

        /// <summary>
        /// Finds the index of the first item, in the range of <paramref name="count"/> items starting from <paramref name="index"/>,  
        /// that is equal to <paramref name="item"/>. 
        /// </summary>
        /// <remarks>The default implementation of equality for type T is used in the search. This is the
        /// equality defined by IComparable&lt;T&gt; or object.Equals.</remarks>
        /// <param name="item">The item to search fror.</param>
        /// <param name="index">The starting index of the range to check.</param>
        /// <param name="count">The number of items in range to check.</param>
        /// <returns>The index of the first item in the given range that that is equal to <paramref name="item"/>.  If no item is equal
        /// to <paramref name="item"/>, -1 is returned.</returns>
        public virtual int IndexOf(T item, int index, int count)
        {
            int foundIndex = Algorithms.FirstIndexOf<T>(Range(index, count), item, EqualityComparer<T>.Default);

            if (foundIndex >= 0)
                return foundIndex + index;
            else
                return -1;
        }

        /// <summary>
        /// Finds the index of the last item in the list that is equal to <paramref name="item"/>. 
        /// </summary>
        /// <remarks>The default implementation of equality for type T is used in the search. This is the
        /// equality defined by IComparable&lt;T&gt; or object.Equals.</remarks>
        /// <param name="item">The item to search fror.</param>
        /// <returns>The index of the last item in the list that that is equal to <paramref name="item"/>.  If no item is equal
        /// to <paramref name="item"/>, -1 is returned.</returns>
        public virtual int LastIndexOf(T item)
        {
            return Algorithms.LastIndexOf<T>(this, item, EqualityComparer<T>.Default);
        }

        /// <summary>
        /// Finds the index of the last item, in the range of items extending from the beginning
        /// of the list to <paramref name="index"/>, that is equal to <paramref name="item"/>. 
        /// </summary>
        /// <remarks>The default implementation of equality for type T is used in the search. This is the
        /// equality defined by IComparable&lt;T&gt; or object.Equals.</remarks>
        /// <param name="item">The item to search fror.</param>
        /// <param name="index">The ending index of the range to check.</param>
        /// <returns>The index of the last item in the given range that that is equal to <paramref name="item"/>.  If no item is equal
        /// to <paramref name="item"/>, -1 is returned.</returns>
        public virtual int LastIndexOf(T item, int index)
        {
            int foundIndex = Algorithms.LastIndexOf<T>(Range(0, index + 1), item, EqualityComparer<T>.Default);

            return foundIndex;
        }

        /// <summary>
        /// Finds the index of the last item, in the range of <paramref name="count"/> items ending at <paramref name="index"/>, 
        /// that is equal to <paramref name="item"/>. 
        /// </summary>
        /// <remarks>The default implementation of equality for type T is used in the search. This is the
        /// equality defined by IComparable&lt;T&gt; or object.Equals.</remarks>
        /// <param name="item">The item to search for.</param>
        /// <param name="index">The ending index of the range to check.</param>
        /// <param name="count">The number of items in range to check.</param>
        /// <returns>The index of the last item in the given range that that is equal to <paramref name="item"/>.  If no item is equal
        /// to <paramref name="item"/>, -1 is returned.</returns>
        public virtual int LastIndexOf(T item, int index, int count)
        {
            int foundIndex = Algorithms.LastIndexOf<T>(Range(index - count + 1, count), item, EqualityComparer<T>.Default);

            if (foundIndex >= 0)
                return foundIndex + index - count + 1;
            else
                return -1;
        }

        /// <summary>
        /// Returns a view onto a sub-range of this list. Items are not copied; the
        /// returned IList&lt;T&gt; is simply a different view onto the same underlying items. Changes to this list
        /// are reflected in the view, and vice versa. Insertions and deletions in the view change the size of the 
        /// view, but insertions and deletions in the underlying list do not.
        /// </summary>
        /// <remarks>
        /// <para>This method can be used to apply an algorithm to a portion of a list. For example:</para>
        /// <code>Algorithms.ReverseInPlace(deque.Range(3, 6))</code>
        /// will reverse the 6 items beginning at index 3.</remarks>
        /// <param name="start">The starting index of the view.</param>
        /// <param name="count">The number of items in the view.</param>
        /// <returns>A list that is a view onto the given sub-part of this list. </returns>
        /// <exception cref="ArgumentOutOfRangeException"><paramref name="start"/> or <paramref name="count"/> is negative.</exception>
        /// <exception cref="ArgumentOutOfRangeException"><paramref name="start"/> + <paramref name="count"/> is greater than the
        /// size of the list.</exception>
        public virtual IList<T> Range(int start, int count)
        {
            return Algorithms.Range<T>(this, start, count);
        }

        /// <summary>
        /// Convert the given parameter to T. Throw an ArgumentException
        /// if it isn't.
        /// </summary>
        /// <param name="name">parameter name</param>
        /// <param name="value">parameter value</param>
        private T ConvertToItemType(string name, object value)
        {
            try {
                return (T)value;
            }
            catch (InvalidCastException) {
                throw new ArgumentException(string.Format(Strings.WrongType, value, typeof(T)), name);
            }
        }

        /// <summary>
        /// Adds an item to the end of the list. This method is equivalent to calling: 
        /// <code>Insert(Count, item)</code>
        /// </summary>
        /// <param name="value">The item to add to the list.</param>
        /// <exception cref="ArgumentException"><paramref name="value"/> cannot be converted to T.</exception>
        int IList.Add(object value)
        {
            int count = Count;
            Insert(count, ConvertToItemType("value", value));
            return count;
        }

        /// <summary>
        /// Removes all the items from the list, resulting in an empty list.
        /// </summary>
        void IList.Clear()
        {
            Clear();
        }

        /// <summary>
        /// Determines if the list contains any item that compares equal to <paramref name="value"/>.
        /// </summary>
        /// <remarks>Equality in the list is determined by the default sense of
        /// equality for T. If T implements IComparable&lt;T&gt;, the
        /// Equals method of that interface is used to determine equality. Otherwise, 
        /// Object.Equals is used to determine equality.</remarks>
        /// <param name="value">The item to search for.</param>
        bool IList.Contains(object value)
        {
            if (value is T || value == null)
                return Contains((T)value);
            else
                return false;
        }

        /// <summary>
        /// Find the first occurrence of an item equal to <paramref name="value"/>
        /// in the list, and returns the index of that item.
        /// </summary>
        /// <remarks>Equality in the list is determined by the default sense of
        /// equality for T. If T implements IComparable&lt;T&gt;, the
        /// Equals method of that interface is used to determine equality. Otherwise, 
        /// Object.Equals is used to determine equality.</remarks>
        /// <param name="value">The item to search for.</param>
        /// <returns>The index of <paramref name="value"/>, or -1 if no item in the 
        /// list compares equal to <paramref name="value"/>.</returns>
        int IList.IndexOf(object value)
        {
            if (value is T || value == null)
                return IndexOf((T)value);
            else
                return -1;
        }

        /// <summary>
        /// Insert a new
        /// item at the given index. 
        /// </summary>
        /// <param name="index">The index in the list to insert the item at. After the
        /// insertion, the inserted item is located at this index. The
        /// first item in the list has index 0.</param>
        /// <param name="value">The item to insert at the given index.</param>
        /// <exception cref="ArgumentOutOfRangeException"><paramref name="index"/> is
        /// less than zero or greater than Count.</exception>
        /// <exception cref="ArgumentException"><paramref name="value"/> cannot be converted to T.</exception>
        void IList.Insert(int index, object value)
        {
            Insert(index, ConvertToItemType("value", value));
        }

        /// <summary>
        /// Returns whether the list is a fixed size. This implementation always returns false.
        /// </summary>
        /// <value>Alway false, indicating that the list is not fixed size.</value>
        bool IList.IsFixedSize
        {
            get { return false; }
        }

        /// <summary>
        /// Returns whether the list is read only. This implementation returns the value
        /// from ICollection&lt;T&gt;.IsReadOnly, which is by default, false.
        /// </summary>
        /// <value>By default, false, indicating that the list is not read only.</value>
        bool IList.IsReadOnly
        {
            get { return ((ICollection<T>)this).IsReadOnly; }
        }

        /// <summary>
        /// Searches the list for the first item that compares equal to <paramref name="value"/>.
        /// If one is found, it is removed. Otherwise, the list is unchanged.
        /// </summary>
        /// <remarks>Equality in the list is determined by the default sense of
        /// equality for T. If T implements IComparable&lt;T&gt;, the
        /// Equals method of that interface is used to determine equality. Otherwise, 
        /// Object.Equals is used to determine equality.</remarks>
        /// <param name="value">The item to remove from the list.</param>
        /// <exception cref="ArgumentException"><paramref name="value"/> cannot be converted to T.</exception>
        void IList.Remove(object value)
        {
            if (value is T || value == null)
                Remove((T)value);
        }

        /// <summary>
        /// Removes the
        /// item at the given index. 
        /// </summary>
        /// <param name="index">The index in the list to remove the item at. The
        /// first item in the list has index 0.</param>
        /// <exception cref="ArgumentOutOfRangeException"><paramref name="index"/> is
        /// less than zero or greater than or equal to Count.</exception>
        void IList.RemoveAt(int index)
        {
            RemoveAt(index);
        }

        /// <summary>
        /// Gets or sets the
        /// value at a particular index in the list.
        /// </summary>
        /// <param name="index">The index in the list to get or set an item at. The
        /// first item in the list has index 0, and the last has index Count-1.</param>
        /// <value>The item at the given index.</value>
        /// <exception cref="ArgumentOutOfRangeException"><paramref name="index"/> is
        /// less than zero or greater than or equal to Count.</exception>
        /// <exception cref="ArgumentException"><paramref name="value"/> cannot be converted to T.</exception>
        object IList.this[int index]
        {
            get
            {
                return this[index];
            }

            set
            {
                this[index] = ConvertToItemType("value", value);
            }
        }
    }
}