macros-loop? calling macros X times?

[Andrew Arro]

is it possible to make smth like a loop of macroses? i.e. i want some
macros to be called X times, all that on the PREPROCESSOR lever

i was trying smth like

#define vv_0 100
#define vv_1 101
#define vv_2 102
#define vv_3 103
#define vv_4 104

#define RUN(cur, max) \
#if cur<max \
printf("%d %d\n", cur, vv_ ## cur); \
RUN((cur+1), max) \
#endif
but seems like #if is not possible inside of a macros?

[Martin Ambuhl]

Andrew Arro wrote:

is it possible to make smth like a loop of macroses? i.e. i want some
macros to be called X times, all that on the PREPROCESSOR lever

i was trying smth like

#define vv_0 100
#define vv_1 101
#define vv_2 102
#define vv_3 103
#define vv_4 104

#define RUN(cur, max) \
#if cur<max \
printf("%d %d\n", cur, vv_ ## cur); \
RUN((cur+1), max) \ ^^ Are you sure you don't want a ';' here?
#endif
but seems like #if is not possible inside of a macros?

Why should you want it, anyway?

#define RUN(cur, max) do { \
if ( (cur) < (max)) { \
printf("%d %d\n", (cur), vv_ ## (cur)); \
RUN(((cur)+1), (max)); \
}
} while (0);

I'd worry about the possible side effects from multiple evaluations of
the arguments.

[S.Tobias]

Andrew Arro <ar**@arro.ru> wrote:

is it possible to make smth like a loop of macroses? i.e. i want some
macros to be called X times, all that on the PREPROCESSOR lever

In general it is possible, but not straightforward, though.
You might try and have a look at
http://www.boost.org/libs/preprocessor/doc/index.html
particularly at FOR and REPEAT.

--
Stan Tobias
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