BOOST_VMD_ASSERT_IS_SEQ_D — Asserts that the sequence is a Boost PP seq. Re-entrant version.
// In header: <boost/vmd/assert_is_seq.hpp> BOOST_VMD_ASSERT_IS_SEQ_D(d, sequence)
The macro checks that the sequence is a Boost PP seq. If it is not a Boost PP seq, it forces a compiler error.
The macro normally checks for a Boost PP seq only in debug mode. However an end-user can force the macro to check or not check by defining the macro BOOST_VMD_ASSERT_DATA to 1 or 0 respectively.
d = The next available BOOST_PP_WHILE iteration.
sequence = a possible Boost PP seq.
returns = Normally the macro returns nothing. If the sequence is a Boost PP seq, nothing is output. For VC++, because there is no sure way of forcing a compiler error from within a macro without producing output, if the sequence is not a Boost PP seq the macro forces a compiler error by outputting invalid C++. For all other compilers a compiler error is forced without producing output if the sequence is not a Boost PP seq.