mono/mcs/class/System.Core/System.Linq/OrderedSequence.cs

// 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
//
// Authors:
//        Alejandro Serrano "Serras" ([email protected])
//

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

namespace System.Linq
{
        public abstract class OrderedSequence<T> : IEnumerable<T>
        {
                public IEnumerator<T> GetEnumerator ()
                {
                        return EnumeratorImplementation ();
                }
                
                IEnumerator IEnumerable.GetEnumerator ()
                {
                        return EnumeratorImplementation ();
                }
                
                protected abstract IEnumerator<T> EnumeratorImplementation ();
                
                protected internal abstract IEnumerable<T> Sort (IEnumerable<T> previousSource);
        }
}