category.cs

	[Category(typeof(NSLayoutConstraint))]
	public static class DebugConstraint
	{
		[Export("description")]
		public static string Description(this NSLayoutConstraint @this)
		{
			// XAMARIN: either of the below two lines causes a stackoverflow, presumably because this method is being invoked instead of the one defined by NSLayoutConstraint
			//var result = @this.PerformSelector(new Selector("description"));
			//var originalDescription = @this.Description;
			objc_super super = new objc_super ();
			super.receiver = @this.Handle;
			super.@class = Class.GetHandle (typeof(NSLayoutConstraint).BaseType);
			var result = Runtime.GetNSObject (objc_msgSendSuper (ref super, Selector.GetHandle ("description")));
			Console.WriteLine ("desc: {0}", result);
			return result.ToString ();
		}

		struct objc_super {
			public IntPtr receiver;
			public IntPtr @class;
		}

		[System.Runtime.InteropServices.DllImport ("libobjc.dylib")]
		static extern IntPtr objc_msgSendSuper (ref objc_super super, IntPtr sel);
	}