using System.Collections.Generic; namespace System.Linq { internal abstract class SortContext<TElement> : IComparer<int> { protected SortDirection direction; protected SortContext<TElement> child_context; protected SortContext(SortDirection direction, SortContext<TElement> child_context) { this.direction = direction; this.child_context = child_context; } public abstract void Initialize(TElement[] elements); public abstract int Compare(int first_index, int second_index); } }