V2 string

[Derek Parnell]

On Fri, 6 Jul 2007 14:23:43 +1000, Derek Parnell wrote:

> On Thu, 05 Jul 2007 20:58:11 -0700, Walter Bright wrote:
> 
>> James Dennett wrote:
>>> I've found many times when the difference between an empty
>>> string and no string was important; they generally have
>>> nothing to do with extending at all.  I'd be interested to
>>> know why you assert that no such cases exist.
>> 
>> I'd like to know of such cases.
> 
>   char[] Option;
> 
>   Option = getOptionFromUser();
>   if (Option.ptr = 0)
>   {
>    Option = DefaultOption;
>   }
> 
> However, if the user sets the option to "" then that is what they want and
> not the default one.

And if you must nitpick that one can code this a different way then here is
another example.

Let's say that there is this library routine, which is closed source and I
don't have access to its source, that accepts a string as its argument.
Further more, if that passed string is null the routine uses a default
value - whatever that is because I don't know it. Now in my code I call it
with ...

   SomeFunc("");   -- Use an empty string to do its magic
   SomeFunc(null); -- But this time, use the default value

Remember, I have no control over the SomeFunc routine's implementation.

-- 
Derek
(skype: derek.j.parnell)
Melbourne, Australia
6/07/2007 2:54:45 PM