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## Macro BOOST_VMD_ASSERT_IS_SEQ

BOOST_VMD_ASSERT_IS_SEQ — Asserts that the sequence is a Boost PP seq.

## Synopsis

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

    BOOST_VMD_ASSERT_IS_SEQ(sequence)

## Description

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.

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.