ceph/src/boost/libs/local_function/include/boost/local_function/aux_/preprocessor/traits/decl_params.hpp

   1
   2 // Copyright (C) 2009-2012 Lorenzo Caminiti
   3 // Distributed under the Boost Software License, Version 1.0
   4 // (see accompanying file LICENSE_1_0.txt or a copy at
   5 // http://www.boost.org/LICENSE_1_0.txt)
   6 // Home at http://www.boost.org/libs/local_function
   7
   8 #ifndef BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS_HPP_
   9 #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS_HPP_
  10
  11 #include <boost/local_function/aux_/preprocessor/traits/decl_/index.hpp>
  12 #include <boost/local_function/aux_/preprocessor/traits/param.hpp>
  13 #include <boost/local_function/detail/preprocessor/keyword/default.hpp>
  14 #include <boost/preprocessor/tuple/elem.hpp>
  15 #include <boost/preprocessor/tuple/eat.hpp>
  16 #include <boost/preprocessor/tuple/rem.hpp>
  17 #include <boost/preprocessor/arithmetic/inc.hpp>
  18 #include <boost/preprocessor/control/iif.hpp>
  19 #include <boost/preprocessor/logical/compl.hpp>
  20 #include <boost/preprocessor/facilities/is_empty.hpp>
  21 #include <boost/preprocessor/list/adt.hpp>
  22 #include <boost/preprocessor/list/fold_left.hpp>
  23
  24 // PRIVATE //
  25
  26 #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS_DEFAULT_OP_(s, \
  27         default_count, param_traits) \
  28     BOOST_PP_IIF(BOOST_PP_IS_EMPTY( \
  29             BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_DEFAULT(param_traits)), \
  30         BOOST_PP_TUPLE_REM(1) \
  31     , \
  32         BOOST_PP_INC \
  33     )(default_count)
  34
  35 // Precondition: params is a pp-list which is not nil.
  36 #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS_DEFAULT_COUNT_(params) \
  37     BOOST_PP_LIST_FOLD_LEFT( \
  38             BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS_DEFAULT_OP_, \
  39             0 /* start with defaults_count to 0 */, params)
  40
  41 // PUBLIC //
  42
  43 // Expand: pp-list of param-traits (no bound variables).
  44 #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS(decl_traits) \
  45     BOOST_PP_TUPLE_ELEM(BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_INDEX_MAX, \
  46             BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_INDEX_PARAMS, decl_traits)
  47
  48 // Expand: number of parameters with default values (0 if no default).
  49 #define BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS_DEFAULT_COUNT( \
  50         decl_traits) \
  51     BOOST_PP_IIF(BOOST_PP_LIST_IS_CONS( \
  52             BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS(decl_traits)), \
  53         BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS_DEFAULT_COUNT_ \
  54     , \
  55         0 BOOST_PP_TUPLE_EAT(1) \
  56     )(BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_PARAMS(decl_traits))
  57
  58 #endif // #include guard
  59