using System;

namespace System.Collections.Generic
{
	/// <summary>Provides a base class for implementations of the <see cref="T:System.Collections.Generic.IComparer`1" /> generic interface.</summary>
	/// <typeparam name="T">The type of objects to compare.</typeparam>
	/// <filterpriority>1</filterpriority>
	// Token: 0x020000FB RID: 251
	[Serializable]
	public abstract class Comparer<T> : IComparer<T>, IComparer
	{
		// Token: 0x06000C67 RID: 3175 RVA: 0x00038470 File Offset: 0x00036670
		static Comparer()
		{
			if (typeof(IComparable<T>).IsAssignableFrom(typeof(T)))
			{
				Comparer<T>._default = (Comparer<T>)Activator.CreateInstance(typeof(GenericComparer<>).MakeGenericType(new Type[] { typeof(T) }));
			}
			else
			{
				Comparer<T>._default = new Comparer<T>.DefaultComparer();
			}
		}

		/// <summary>Compares two objects and returns a value indicating whether one is less than, equal to, or greater than the other.</summary>
		/// <returns>A signed integer that indicates the relative values of <paramref name="x" /> and <paramref name="y" />, as shown in the following table.Value Meaning Less than zero<paramref name="x" /> is less than <paramref name="y" />.Zero<paramref name="x" /> equals <paramref name="y" />.Greater than zero<paramref name="x" /> is greater than <paramref name="y" />.</returns>
		/// <param name="x">The first object to compare.</param>
		/// <param name="y">The second object to compare.</param>
		/// <exception cref="T:System.ArgumentException">
		///   <paramref name="x" /> or <paramref name="y" /> is of a type that cannot be cast to type <paramref name="T" />.-or-<paramref name="x" /> and <paramref name="y" /> do not implement either the <see cref="T:System.IComparable`1" /> generic interface or the <see cref="T:System.IComparable" /> interface.</exception>
		// Token: 0x06000C68 RID: 3176 RVA: 0x000384DC File Offset: 0x000366DC
		int IComparer.Compare(object x, object y)
		{
			if (x == null)
			{
				return (y != null) ? (-1) : 0;
			}
			if (y == null)
			{
				return 1;
			}
			if (x is T && y is T)
			{
				return this.Compare((T)((object)x), (T)((object)y));
			}
			throw new ArgumentException();
		}

		/// <summary>When overridden in a derived class, performs a comparison of two objects of the same type and returns a value indicating whether one object is less than, equal to, or greater than the other.</summary>
		/// <returns>A signed integer that indicates the relative values of <paramref name="x" /> and <paramref name="y" />, as shown in the following table.Value Meaning Less than zero <paramref name="x" /> is less than <paramref name="y" />.Zero <paramref name="x" /> equals <paramref name="y" />.Greater than zero <paramref name="x" /> is greater than <paramref name="y" />.</returns>
		/// <param name="x">The first object to compare.</param>
		/// <param name="y">The second object to compare.</param>
		/// <exception cref="T:System.ArgumentException">Type <paramref name="T" /> does not implement either the <see cref="T:System.IComparable`1" /> generic interface or the <see cref="T:System.IComparable" /> interface.</exception>
		// Token: 0x06000C69 RID: 3177
		public abstract int Compare(T x, T y);

		/// <summary>Returns a default sort order comparer for the type specified by the generic argument.</summary>
		/// <returns>An object that inherits <see cref="T:System.Collections.Generic.Comparer`1" /> and serves as a sort order comparer for type <paramref name="T" />.</returns>
		// Token: 0x170001C7 RID: 455
		// (get) Token: 0x06000C6A RID: 3178 RVA: 0x00038534 File Offset: 0x00036734
		public static Comparer<T> Default
		{
			get
			{
				return Comparer<T>._default;
			}
		}

		// Token: 0x0400035F RID: 863
		private static readonly Comparer<T> _default;

		// Token: 0x020000FC RID: 252
		private sealed class DefaultComparer : Comparer<T>
		{
			// Token: 0x06000C6C RID: 3180 RVA: 0x00038544 File Offset: 0x00036744
			public override int Compare(T x, T y)
			{
				if (x == null)
				{
					return (y != null) ? (-1) : 0;
				}
				if (y == null)
				{
					return 1;
				}
				if (x is IComparable<T>)
				{
					return ((IComparable<T>)((object)x)).CompareTo(y);
				}
				if (x is IComparable)
				{
					return ((IComparable)((object)x)).CompareTo(y);
				}
				throw new ArgumentException("does not implement right interface");
			}
		}
	}
}