luax & bit operations

[Asko Kauppi <asko.kauppi@...>]

Doing remarkably, I think.  It would take too long to go through what 
the 'enum' addition to LuaX really does, but it allows ..well.. what 
you'd expect from enums (type checking) and bitlib (binary or & and) 
sortof by itself.

Here's some code, testing SDL flags ('flags' is a userdata enum with 
'call' metamethod):

	if gamestate.screen.flags(SDL_HWSURFACE) then
	--if btest( gamestate.screen.flags, SDL_HWSURFACE ) then
		print "Screen is in video memory"
	else
		print "Screen is in system memory"
	end

Or-ing values together is also simple:

	local event_buffer= SDL.Init( SDL_INIT_VIDEO.. SDL_INIT_AUDIO )


The features have been implemented with regular Lua 5.x userdata & 
metamethods. Might even work with Lua 4.0, haven't tested.. :)