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## Macro BOOST_VMD_ASSERT_IS_TYPE_D

BOOST_VMD_ASSERT_IS_TYPE_D — Asserts that the sequence is a VMD type. Re-entrant version.

## Synopsis

    // In header: <boost/vmd/assert_is_type.hpp>

    BOOST_VMD_ASSERT_IS_TYPE_D(d, sequence)

## Description

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.