reactive/Ix.NET/Source/System.Interactive/System/Linq/Operators/Hide.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the Apache 2.0 License.
// See the LICENSE file in the project root for more information. 

using System.Collections.Generic;

namespace System.Linq
{
    public static partial class EnumerableEx
    {
        /// <summary>
        /// Hides the enumerable sequence object identity.
        /// </summary>
        /// <typeparam name="TSource">Source sequence element type.</typeparam>
        /// <param name="source">Source sequence.</param>
        /// <returns>Enumerable sequence with the same behavior as the original, but hiding the source object identity.</returns>
        /// <remarks>
        /// <see cref="Enumerable.AsEnumerable{TSource}(IEnumerable{TSource})"/> doesn't hide the object identity, and simply acts as a cast
        /// to the <see cref="IEnumerable{T}"/> interface type.
        /// </remarks>
        public static IEnumerable<TSource> Hide<TSource>(this IEnumerable<TSource> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return HideCore(source);
        }

        private static IEnumerable<TSource> HideCore<TSource>(this IEnumerable<TSource> source)
        {
            foreach (var item in source)
            {
                yield return item;
            }
        }
    }
}