def slice(*args)
if args.size > 2
raise ArgumentError, "wrong number of arguments (#{args.size} for 1)"
elsif (args.size == 2 && !(args.first.is_a?(Numeric) || args.first.is_a?(Regexp)))
raise TypeError, "cannot convert #{args.first.class} into Integer"
elsif (args.size == 2 && !args[1].is_a?(Numeric))
raise TypeError, "cannot convert #{args[1].class} into Integer"
elsif args[0].kind_of? Range
cps = self.class.u_unpack(@wrapped_string).slice(*args)
result = cps.nil? ? nil : cps.pack('U*')
elsif args[0].kind_of? Regexp
result = @wrapped_string.slice(*args)
elsif args.size == 1 && args[0].kind_of?(Numeric)
character = self.class.u_unpack(@wrapped_string)[args[0]]
result = character.nil? ? nil : [character].pack('U')
else
result = self.class.u_unpack(@wrapped_string).slice(*args).pack('U*')
end
result.nil? ? nil : chars(result)
end