Re: [boost] [typeof] while we're at it...

From: Tobias Schwinger (tschwinger_at_[hidden])
Date: 2006-01-29 11:28:15

Paul Mensonides wrote:
> BOOST_PP_IF(
>     n,
>     BOOST_PP_TUPLE_EAT,
>     BOOST_PP_TUPLE_REM
> )(1)( EXPENSIVE_MACRO_INVOCATION() )
> 
> ...where EXPENSIVE_MACRO_INVOCATION() is only invoked if 'n' is 0.

Guessing from the overtone of your comment it would be better to say

   BOOST_PP_IF(n, BOOST_PP_TUPLE_EAT(0), EXPENSIVE_MACRO_INVOCATION)()

to be on the safe side with less compliant preprocessors. Correct?

---
   #define MACRO(x) x
   MACRO(BOOST_PP_EMPTY())
BTW. is this special case safe (theoretically and practically, that is)?
Regards,
Tobias