boost/vmd/is_empty_list.hpp
// (C) Copyright Edward Diener 2011-2015 // 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_EMPTY_LIST_HPP) #define BOOST_VMD_IS_EMPTY_LIST_HPP #include <boost/vmd/detail/setup.hpp> #if BOOST_PP_VARIADICS #include <boost/vmd/detail/is_list.hpp> /* The succeeding comments in this file are in doxygen format. */ /** \file */ /** \def BOOST_VMD_IS_EMPTY_LIST(sequence) \brief Tests whether a sequence is an empty Boost PP list. An empty Boost PP list consists of the single identifier 'BOOST_PP_NIL'. This identifier also serves as a list terminator for a non-empty list. sequence = a preprocessor parameter returns = 1 if the sequence is an empty Boost PP list 0 if it is not. The macro will generate a preprocessing error if the input as an empty list marker, instead of being an identifier, is a preprocessor token which VMD cannot parse, as in the example '&BOOST_PP_NIL'. */ #define BOOST_VMD_IS_EMPTY_LIST(sequence) \ BOOST_VMD_DETAIL_IS_LIST_IS_EMPTY_LIST_PROCESS(sequence) \ /**/ /** \def BOOST_VMD_IS_EMPTY_LIST_D(d,sequence) \brief Tests whether a sequence is an empty Boost PP list. Re-entrant version. An empty Boost PP list consists of the single identifier 'BOOST_PP_NIL'. This identifier also serves as a list terminator for a non-empty list. d = The next available BOOST_PP_WHILE iteration sequence = a preprocessor parameter returns = 1 if the sequence is an empty Boost PP list 0 if it is not. The macro will generate a preprocessing error if the input as an empty list marker, instead of being an identifier, is a preprocessor token which VMD cannot parse, as in the example '&BOOST_PP_NIL'. */ #define BOOST_VMD_IS_EMPTY_LIST_D(d,sequence) \ BOOST_VMD_DETAIL_IS_LIST_IS_EMPTY_LIST_PROCESS_D(d,sequence) \ /**/ #endif /* BOOST_PP_VARIADICS */ #endif /* BOOST_VMD_IS_EMPTY_LIST_HPP */