[Boost-users] [preprocessor] extending loop limit >> 256

Subject: [Boost-users] [preprocessor] extending loop limit >> 256
From: Martin Pasdzierny (martin_at_[hidden])
Date: 2010-12-29 07:01:22

Hi boost experts,

using  BOOST_PP_LOCAL_ITERATE() and friends I found the maximum number 
of iterations to be limited to 256.

The according values seemed to be defined in
    .../preprocessor/config/limits.hpp

But changing these values does *not* have any effect on the maximum 
number of iterations

...
#define BOOST_PP_LOCAL_MACRO(n) g(n);
#define BOOST_PP_LOCAL_LIMITS (1, 300 )
#include BOOST_PP_LOCAL_ITERATE()
#undef BOOST_PP_LOCAL_MACRO
#undef BOOST_PP_LOCAL_LIMITS
...

still creates:

g(1);
g(2);
g(3);
...
g(255);
g(256);

the expected:
g(257);
g(258);
...
g(299);
g(300);
are *not* generated.

Stepping through the libraries code I found the mechanisms far more 
complicated than expected.
Now my question: is there any recommended procedure to increase the 
iteration limitation to values like 10000 ?

I found a couple of code locations explicitly repeating code with hard 
coded values from 1 ... 256.
I guess at least this code needs to be extended, but probably consistent 
with some other changes.

I am thinking of a perl script to generate stuff like that, but before 
working on that I'd like to get some qualified recommendations  ;)

Thanks in advance,
Martin.