On Sat, Oct 12, 2002 at 01:44:36AM -0700, Terry Lambert wrote: > > I think the lack of "||" and "&&" mostly had to do with the fact > that there was conditional evaluation of the RHS of the operator, > based on the result of the LHS. > > With just an "&" or an "|", you actually need a much less complicated > state machine to evaluate a constant expression. With the "||"/"&&", > you almost have to do an edge associative operation, which implies a > much more complex state machine for the preprocessor, I think.
No -- the short-circuiting behaviour of && and || only matters if you can have side-effects, which you can't in the preprocessor, so there is no need to implement it (unifdef doesn't). Tony. -- f.a.n.finch <[EMAIL PROTECTED]> http://dotat.at/ THAMES DOVER: SOUTHEASTERLY VEERING NORTHWESTERLY 4 OR 5, OCCASIONALLY 6, BECOMING VARIABLE 3. RAIN OR SHOWERS. MODERATE OR GOOD. To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
