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Diffstat (limited to 'boost/vmd/is_empty_list.hpp')
-rw-r--r-- | boost/vmd/is_empty_list.hpp | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/boost/vmd/is_empty_list.hpp b/boost/vmd/is_empty_list.hpp new file mode 100644 index 0000000000..cad73a591e --- /dev/null +++ b/boost/vmd/is_empty_list.hpp @@ -0,0 +1,73 @@ + +// (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 */ |