vmd/seq/to_array.hpp

0001
0002 //  (C) Copyright Edward Diener 2015
0003 //  Use, modification and distribution are subject to the Boost Software License,
0004 //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
0005 //  http://www.boost.org/LICENSE_1_0.txt).
0006
0007 #if !defined(BOOST_VMD_SEQ_TO_ARRAY_HPP)
0008 #define BOOST_VMD_SEQ_TO_ARRAY_HPP
0009
0010 #include <boost/vmd/detail/setup.hpp>
0011
0012 #if BOOST_PP_VARIADICS
0013
0014 #include <boost/preprocessor/control/iif.hpp>
0015 #include <boost/preprocessor/seq/to_array.hpp>
0016 #include <boost/vmd/identity.hpp>
0017 #include <boost/vmd/is_empty.hpp>
0018
0019 /*
0020
0021   The succeeding comments in this file are in doxygen format.
0022
0023 */
0024
0025 /** \file
0026 */
0027
0028 /** \def BOOST_VMD_SEQ_TO_ARRAY(seq)
0029
0030     \brief converts a seq to an array.
0031
0032     seq = seq to be converted.
0033
0034     If the seq is an empty seq it is converted to an array with 0 elements.
0035     Otherwise the seq is converted to an array with the same number of elements as the seq.
0036 */
0037
0038 #define BOOST_VMD_SEQ_TO_ARRAY(seq) \
0039     BOOST_VMD_IDENTITY_RESULT \
0040         ( \
0041         BOOST_PP_IIF \
0042             ( \
0043             BOOST_VMD_IS_EMPTY(seq), \
0044             BOOST_VMD_IDENTITY((0,())), \
0045             BOOST_PP_SEQ_TO_ARRAY \
0046             ) \
0047         (seq) \
0048         ) \
0049 /**/
0050
0051 #endif /* BOOST_PP_VARIADICS */
0052 #endif /* BOOST_VMD_SEQ_TO_ARRAY_HPP */