//******************************
// Written by Peter Golde
// Copyright (c) 2004-2007, 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>
/// A holder class for various internal utility functions that need to be shared.
/// </summary>
internal static class Util
{
/// <summary>
/// Wrap an enumerable so that clients can't get to the underlying
/// implementation via a down-case
/// </summary>
/// <param name="wrapped">Enumerable to wrap.</param>
/// <returns>A wrapper around the enumerable.</returns>
public static IEnumerable<T> CreateEnumerableWrapper<T>(IEnumerable<T> wrapped)
{
return new WrapEnumerable<T>(wrapped);
}
/// <summary>
/// Wrap an enumerable so that clients can't get to the underlying
/// implementation via a down-cast.
/// </summary>
class WrapEnumerable<T> : IEnumerable<T>
{
IEnumerable<T> wrapped;
/// <summary>
/// Create the wrapper around an enumerable.
/// </summary>
/// <param name="wrapped">IEnumerable to wrap.</param>
public WrapEnumerable(IEnumerable<T> wrapped)
{
this.wrapped = wrapped;
}
public IEnumerator<T> GetEnumerator()
{
return wrapped.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return ((IEnumerable)wrapped).GetEnumerator();
}
}
}
}
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