text: 
  //  (C) Copyright Edward Diener 2015
  //  Use, modification and distribution are subject to the Boost Software License,
  //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  //  http://www.boost.org/LICENSE_1_0.txt).
  
  #if !defined(BOOST_VMD_IS_VMD_SEQ_HPP)
  #define BOOST_VMD_IS_VMD_SEQ_HPP
  
  #include <boost/vmd/detail/setup.hpp>
  
  #if BOOST_PP_VARIADICS
  
  #include <boost/preprocessor/control/iif.hpp>
  #include <boost/vmd/identity.hpp>
  #include <boost/vmd/is_empty.hpp>
  #include <boost/vmd/is_seq.hpp>
  
  /*
  
    The succeeding comments in this file are in doxygen format.
  
  */
  
  /** \file
  */
  
  /** \def BOOST_VMD_IS_VMD_SEQ(sequence)
  
      \brief Determines if a sequence is a VMD seq.
  
      The macro checks that the sequence is a VMD seq.
      A VMD seq, which may be a Boost PP seq or emptiness, is a superset of a Boost PP seq.
      It returns 1 if it is a VMD seq, else if returns 0.
  
      sequence = a possible Boost PP seq
  
      returns = 1 if it a VMD seq, else returns 0.
  
  */
  
  #define BOOST_VMD_IS_VMD_SEQ(sequence) \
      BOOST_VMD_IDENTITY_RESULT \
          ( \
          BOOST_PP_IIF \
              ( \
              BOOST_VMD_IS_EMPTY(sequence), \
              BOOST_VMD_IDENTITY(1), \
              BOOST_VMD_IS_SEQ \
              ) \
          (sequence) \
          ) \
  /**/
  
  #endif /* BOOST_PP_VARIADICS */
  #endif /* BOOST_VMD_IS_VMD_SEQ_HPP */
  