boost/preprocessor/tuple/pop_front.hpp

   1 # /* **************************************************************************
   2 #  *                                                                          *
   3 #  *     (C) Copyright Edward Diener 2013.
   4 #  *     Distributed under the Boost Software License, Version 1.0. (See
   5 #  *     accompanying file LICENSE_1_0.txt or copy at
   6 #  *     http://www.boost.org/LICENSE_1_0.txt)
   7 #  *                                                                          *
   8 #  ************************************************************************** */
   9 #
  10 # /* See http://www.boost.org for most recent version. */
  11 #
  12 # ifndef BOOST_PREPROCESSOR_TUPLE_POP_FRONT_HPP
  13 # define BOOST_PREPROCESSOR_TUPLE_POP_FRONT_HPP
  14 #
  15 # include <boost/preprocessor/config/config.hpp>
  16 #
  17 # if BOOST_PP_VARIADICS
  18 #
  19 # include <boost/preprocessor/array/pop_front.hpp>
  20 # include <boost/preprocessor/array/to_tuple.hpp>
  21 # include <boost/preprocessor/comparison/greater.hpp>
  22 # include <boost/preprocessor/control/iif.hpp>
  23 # include <boost/preprocessor/tuple/size.hpp>
  24 # include <boost/preprocessor/tuple/to_array.hpp>
  25 #
  26 #
  27 # /* BOOST_PP_TUPLE_POP_FRONT */
  28 #
  29 # define BOOST_PP_TUPLE_POP_FRONT(tuple) \
  30     BOOST_PP_IIF \
  31         ( \
  32         BOOST_PP_GREATER(BOOST_PP_TUPLE_SIZE(tuple),1), \
  33         BOOST_PP_TUPLE_POP_FRONT_EXEC, \
  34         BOOST_PP_TUPLE_POP_FRONT_RETURN \
  35         ) \
  36     (tuple) \
  37 /**/
  38 #
  39 # define BOOST_PP_TUPLE_POP_FRONT_EXEC(tuple) \
  40     BOOST_PP_ARRAY_TO_TUPLE(BOOST_PP_ARRAY_POP_FRONT(BOOST_PP_TUPLE_TO_ARRAY(tuple))) \
  41 /**/
  42 #
  43 # define BOOST_PP_TUPLE_POP_FRONT_RETURN(tuple) tuple
  44 #
  45 # /* BOOST_PP_TUPLE_POP_FRONT_Z */
  46 #
  47 # define BOOST_PP_TUPLE_POP_FRONT_Z(z, tuple) \
  48     BOOST_PP_IIF \
  49         ( \
  50         BOOST_PP_GREATER(BOOST_PP_TUPLE_SIZE(tuple),1), \
  51         BOOST_PP_TUPLE_POP_FRONT_Z_EXEC, \
  52         BOOST_PP_TUPLE_POP_FRONT_Z_RETURN \
  53         ) \
  54     (z, tuple) \
  55 /**/
  56 #
  57 # define BOOST_PP_TUPLE_POP_FRONT_Z_EXEC(z, tuple) \
  58     BOOST_PP_ARRAY_TO_TUPLE(BOOST_PP_ARRAY_POP_FRONT_Z(z, BOOST_PP_TUPLE_TO_ARRAY(tuple))) \
  59 /**/
  60 #
  61 # define BOOST_PP_TUPLE_POP_FRONT_Z_RETURN(z, tuple) tuple
  62 #
  63 # endif // BOOST_PP_VARIADICS
  64 #
  65 # endif // BOOST_PREPROCESSOR_TUPLE_POP_FRONT_HPP