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Diffstat (limited to 'boost/vmd/tuple/size.hpp')
-rw-r--r-- | boost/vmd/tuple/size.hpp | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/boost/vmd/tuple/size.hpp b/boost/vmd/tuple/size.hpp new file mode 100644 index 0000000000..1e8d27169f --- /dev/null +++ b/boost/vmd/tuple/size.hpp @@ -0,0 +1,52 @@ + +// (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_TUPLE_SIZE_HPP) +#define BOOST_VMD_TUPLE_SIZE_HPP + +#include <boost/vmd/detail/setup.hpp> + +#if BOOST_PP_VARIADICS + +#include <boost/preprocessor/control/iif.hpp> +#include <boost/preprocessor/tuple/size.hpp> +#include <boost/vmd/identity.hpp> +#include <boost/vmd/is_empty.hpp> + +/* + + The succeeding comments in this file are in doxygen format. + +*/ + +/** \file +*/ + +/** \def BOOST_VMD_TUPLE_SIZE(tuple) + + \brief expands to the size of the tuple passed to it. + + tuple = tuple whose size is to be extracted. + + If the tuple is an empty tuple its size is 0. + Otherwise the result is the number of elements in the tuple. +*/ + +#define BOOST_VMD_TUPLE_SIZE(tuple) \ + BOOST_VMD_IDENTITY_RESULT \ + ( \ + BOOST_PP_IIF \ + ( \ + BOOST_VMD_IS_EMPTY(tuple), \ + BOOST_VMD_IDENTITY(0), \ + BOOST_PP_TUPLE_SIZE \ + ) \ + (tuple) \ + ) \ +/**/ + +#endif /* BOOST_PP_VARIADICS */ +#endif /* BOOST_VMD_TUPLE_SIZE_HPP */ |