From: Yossi.Itzkovich_at_[hidden]
Date: 2004-07-14 23:24:29
Thanks all for your fast (and good) answers.
Yossi
"Paul Mensonides"
<pmenso57_at_comcast. To: <boost_at_[hidden]>
net> cc:
Sent by: Subject: RE: [boost] BOOST_PP_REPEAT with internal macro problem
boost-bounces_at_list
s.boost.org
07/15/2004 07:00
Please respond to
boost
> -----Original Message-----
> [mailto:boost-bounces_at_[hidden]] On Behalf Of
> BOOST_PP_REPEAT works great for me when used like:
>
> #define MAX 5
> #define CODE my_code_goes_here
> BOOST_PP_REPEAT(MAX, CODE, )
^^
Passing nothing as a macro argument is undefined in C++. You should use a
dummie argument instead--preferably not an identifier. I usually use ~ or
?.
>
> But it gets confused when used like:
>
> #define MAX (4+1)
Arkadiy is correct. The library cannot understand the expression (4+1).
It can
only understand unadorned integer literals (such as 1, 2, 3, etc.) from 0
to
256. If you need to do arithmetic, you have to use the arithmetic
primitives of
the library, such as BOOST_PP_ADD or, in this case, BOOST_PP_INC (which is
more
efficient).
Thus, if you want to do a repetition of MAX + 1, you need to say:
BOOST_PP_REPEAT(BOOST_PP_INC(MAX), CODE, ~)
Regards,
Paul Mensonides
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