gistfile1.txt

using System;
using System.Globalization;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

unsafe class Driver {
	private unsafe static byte *category_data;

	[MethodImpl (MethodImplOptions.AggressiveInlining)]
	public static bool IsWhiteSpace (char c)
	{
		unsafe {
			int category = category_data [c];
			if (category <= ((int)UnicodeCategory.OtherNumber))
				return false;
			if (category <= ((int)UnicodeCategory.ParagraphSeparator))
				return true;
			// FIXME: (char)0x205F Medium Mathematical Space has wrong category in 2.0 Profile
			// Remove the if NET_2_0 case once the error is corrected
			return  c >= (char)0x09 && c <= (char)0x0d || c == (char)0x85 || c == (char)0x205F;
		}
	}

	static void Main () {
		Console.WriteLine (IsWhiteSpace (' '));
		Console.WriteLine (IsWhiteSpace ('x'));
	}
}