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## Macro BOOST_VMD_ASSERT_IS_LIST_D

BOOST_VMD_ASSERT_IS_LIST_D — Asserts that the sequence is a Boost PP list. Re-entrant version.

## Synopsis

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

    BOOST_VMD_ASSERT_IS_LIST_D(d, sequence)

## Description

The macro checks that the sequence is a Boost PP list. If it is not a Boost PP list, it forces a compiler error.

The macro normally checks for a Boost PP list 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 list.

    returns  = Normally the macro returns nothing.

               If the sequence is a Boost PP list, 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 list the
               macro forces a compiler error by outputting invalid C++.

               For all other compilers a compiler error is forced
               without producing output if the parameter is not a
               Boost PP list.