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regarded and expertly designed C++ library projects in the
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BOOST_VMD_ASSERT_IS_TYPE_D — Asserts that the sequence is a VMD type. Re-entrant version.
// In header: <boost/vmd/assert_is_type.hpp> BOOST_VMD_ASSERT_IS_TYPE_D(d, sequence)
The macro checks that the sequence is a VMD type. If it is not a VMD type, it forces a compiler error.
The macro normally checks for a VMD type 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 VMD type.
returns = Normally the macro returns nothing. If the sequence is a VMD type, 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 VMD type 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 VMD type.