Consider:
#define BOOST_PP_RDB_MPL_ASSERT(z, n, t) \
BOOST_MPL_ASSERT((BOOST_PP_TUPLE_ELEM( \
2, 0, t)<BOOST_PP_CAT(BOOST_PP_TUPLE_ELEM(2, 1, t), n)>));
// in a file passed to BOOST_PP_ITERATE()
BOOST_PP_REPEAT(n, BOOST_PP_RDB_MPL_ASSERT, (is_column_container, Col))
This works with msvc9 express but not with g++ 4.4.1. When I dig it I
see that BOOST_MPL_ASSERT creates an identifier based on
BOOST_MPL_AUX_PP_COUNTER() which in turns uses either __COUNTER__ (with
msvc9) or __LINE__ (with g++). So with g++ we get name clashes when `n`
is greater than one, because the ASSERT macro attempts to create several
variables with the same name in the same scope.
I guess I could copy the code of BOOST_MPL_ASSERT() in my
BOOST_PP_RDB_MPL_ASSERT macro and incorporate `n` in the identifier.
Is there a better solution ?
Thanks,
J-L
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