Re: [boost] BOOST_PP_ENUM_PARAMS can't be nested inside BOOST_PP_IF?

BOOST_PP_IF(1, BOOST_PP_ENUM_PARAMS(3, p), blah) ENUM_PARAMS is an intermediate if the repetition count is higher than one. An "intermediate" is a single argument that expands to multiple arguments--which creates pathological input that IF cannot deal with:

#define IF(cond, t, f) IIF(BOOL(cond), t, f)

When IF is invoked, the argument for 't' (in particular) gets expanded

"Paul Mensonides" <pmenso57@comcast.net> wrote prior to

substitution of 't' in the replacement list of IF (long before IIF is invoked). This results in:

IIF(BOOL(1), p0, p1, p2, blah)

Which is clearly too many arguments to IIF.

Well, this was simple :-) Thanks a lot for the explanation. Regards, Arkadiy