Re: non-empty false...

[David Jeske <jeske@...>]

On Tue, Dec 01, 1998 at 08:54:15PM -0200, Steve Dekorte wrote:
> On Tue, 1 Dec 1998, David Jeske wrote:
> > No thanks... I'd rather put a proper boolean type into Lua than
> > confuse up the syntax. I was just hoping for a simple way to do it
> > within the Lua runtime meta-mechanisms.
> 
> I also suggested using 0 instead of nil.
> What about that? 

That's what I'm doing now, but it means I have to do things like:

function isTrue(a_var) 
    -- make sure that both nil and 0 are false... too bad
    -- lua dosn't have exceptions, or I'd throw one on nil.
  if ((a_var == nil) or (a_var == 0)) then
     return nil;
  else
     return 1;
  end
end

if (isTrue(foo)) then
  -- do something
end

-- worse, yet, I have to do stuff like:

if (isTrue(foo) and isTrue(bar)) or isTrue(foo2) then
  -- do something
end

-- 
David Jeske (N9LCA) + http://www.chat.net/~jeske/ + jeske@chat.net