1 2 // (C) Copyright Edward Diener 2015 3 // Use, modification and distribution are subject to the Boost Software License, 4 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at 5 // http://www.boost.org/LICENSE_1_0.txt). 6 7 #if !defined(BOOST_VMD_TUPLE_TO_ARRAY_HPP) 8 #define BOOST_VMD_TUPLE_TO_ARRAY_HPP 9 10 #include <boost/vmd/detail/setup.hpp> 11 12 #if BOOST_PP_VARIADICS 13 14 #include <boost/preprocessor/control/iif.hpp> 15 #include <boost/preprocessor/tuple/to_array.hpp> 16 #include <boost/vmd/identity.hpp> 17 #include <boost/vmd/is_empty.hpp> 18 19 /* 20 21 The succeeding comments in this file are in doxygen format. 22 23 */ 24 25 /** \file 26 */ 27 28 /** \def BOOST_VMD_TUPLE_TO_ARRAY(tuple) 29 30 \brief converts a tuple to an array. 31 32 tuple = tuple to be converted. 33 34 If the tuple is an empty tuple it is converted to an array with 0 elements. 35 Otherwise the tuple is converted to an array with the same number of elements as the tuple. 36 */ 37 38 #define BOOST_VMD_TUPLE_TO_ARRAY(tuple) \ 39 BOOST_VMD_IDENTITY_RESULT \ 40 ( \ 41 BOOST_PP_IIF \ 42 ( \ 43 BOOST_VMD_IS_EMPTY(tuple), \ 44 BOOST_VMD_IDENTITY((0,())), \ 45 BOOST_PP_TUPLE_TO_ARRAY \ 46 ) \ 47 (tuple) \ 48 ) \ 49 /**/ 50 51 #endif /* BOOST_PP_VARIADICS */ 52 #endif /* BOOST_VMD_TUPLE_TO_ARRAY_HPP */ 53