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Diffstat (limited to 'boost/vmd/detail/is_empty_tuple.hpp')
-rw-r--r-- | boost/vmd/detail/is_empty_tuple.hpp | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/boost/vmd/detail/is_empty_tuple.hpp b/boost/vmd/detail/is_empty_tuple.hpp new file mode 100644 index 0000000000..dc07681653 --- /dev/null +++ b/boost/vmd/detail/is_empty_tuple.hpp @@ -0,0 +1,74 @@ + +// (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_DETAIL_IS_EMPTY_TUPLE_HPP) +#define BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_HPP + +#include <boost/preprocessor/comparison/equal.hpp> +#include <boost/preprocessor/control/iif.hpp> +#include <boost/preprocessor/tuple/elem.hpp> +#include <boost/preprocessor/tuple/size.hpp> +#include <boost/vmd/identity.hpp> +#include <boost/vmd/is_empty.hpp> +#include <boost/vmd/is_tuple.hpp> + +#define BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_CEM(tuple) \ + BOOST_VMD_IS_EMPTY(BOOST_PP_TUPLE_ELEM(0,tuple)) \ +/**/ + +#define BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_SIZE(tuple) \ + BOOST_VMD_IDENTITY_RESULT \ + ( \ + BOOST_PP_IIF \ + ( \ + BOOST_PP_EQUAL(BOOST_PP_TUPLE_SIZE(tuple),1), \ + BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_CEM, \ + BOOST_VMD_IDENTITY(0) \ + ) \ + (tuple) \ + ) \ +/**/ + +#define BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_SIZE_D(d,tuple) \ + BOOST_VMD_IDENTITY_RESULT \ + ( \ + BOOST_PP_IIF \ + ( \ + BOOST_PP_EQUAL_D(d,BOOST_PP_TUPLE_SIZE(tuple),1), \ + BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_CEM, \ + BOOST_VMD_IDENTITY(0) \ + ) \ + (tuple) \ + ) \ +/**/ + +#define BOOST_VMD_DETAIL_IS_EMPTY_TUPLE(tuple) \ + BOOST_VMD_IDENTITY_RESULT \ + ( \ + BOOST_PP_IIF \ + ( \ + BOOST_VMD_IS_TUPLE(tuple), \ + BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_SIZE, \ + BOOST_VMD_IDENTITY(0) \ + ) \ + (tuple) \ + ) \ +/**/ + +#define BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_D(d,tuple) \ + BOOST_VMD_IDENTITY_RESULT \ + ( \ + BOOST_PP_IIF \ + ( \ + BOOST_VMD_IS_TUPLE(tuple), \ + BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_SIZE_D, \ + BOOST_VMD_IDENTITY(0) \ + ) \ + (d,tuple) \ + ) \ +/**/ + +#endif /* BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_HPP */ |