Re: Bitwsie operators in Lua

[David Jones <drj@...>]

Roberto Ierusalimschy wrote:
> > Essentially any bitwise operation gets converted to a series of       
> > arithmetical operations,                                              
> >     
>
> That is all we wanted for Lua. But "not" and shifts are easy. Can you
> give a viable implementation for or/and?

Well, I was talking about specifying the meaning.  As for an 
implementation, choose the simple portable approach: convert the number 
to your favourite, C, integer type, do the operation in that type, then 
convert back to whatever type you've chosen for numbers.  Sticking to 
double (for numbers) and int (for integers) and doing this gives you a 
portable 32-bit implementation.  luaconf.h helps those who want more.

drj