<Yossi.Itzkovich@ecitele.com> wrote

BOOST_PP_REPEAT works great for me when used like:

#define MAX 5 #define CODE my_code_goes_here BOOST_PP_REPEAT(MAX, CODE, )

But it gets confused when used like:

#define MAX (4+1)

Is ther a work around ?

#define MAX BOOST_PP_INC(4) or #define MAX BOOST_PP_ADD(4, 1)

I even tried: #define MAX (4+1) const int myMax=MAX; BOOST_PP_REPEAT(myMax, CODE , )

myMax is a compile-time constant which is not available to the preprocessor, that's why it doesn't work. HTH, Arkadiy

-----Original Message----- [mailto:boost-bounces@lists.boost.org] 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