ceph/src/boost/libs/parameter/include/boost/parameter/aux_/overloads.hpp

   1 // Copyright David Abrahams, Daniel Wallin 2003. Use, modification and
   2 // distribution is subject to the Boost Software License, Version 1.0.
   3 // (See accompanying file LICENSE_1_0.txt or copy at
   4 // http://www.boost.org/LICENSE_1_0.txt)
   5
   6 // This file generates overloads in this format:
   7 //
   8 //     template<class A0, class A1>
   9 //     typename mpl::apply_wrap1<
  10 //         aux::make_arg_list<
  11 //             PS0,A0
  12 //           , aux::make_arg_list<
  13 //                 PS1,A1
  14 //               , mpl::identity<aux::empty_arg_list>
  15 //             >
  16 //         >
  17 //      , unnamed_list
  18 //     >::type
  19 //     operator()(A0 const& a0, A1 const& a1) const
  20 //     {
  21 //         typedef typename mpl::apply_wrap1<
  22 //             aux::make_arg_list<
  23 //                 PS0,A0
  24 //               , aux::make_arg_list<
  25 //                     PS1,A1
  26 //                   , mpl::identity<aux::empty_arg_list>
  27 //                 >
  28 //             >
  29 //         >::type arg_tuple;
  30 //
  31 //         return arg_tuple(
  32 //             a0
  33 //           , a1
  34 //           , aux::void_()
  35 //             ...
  36 //         );
  37 //     }
  38 //
  39
  40 #if !defined(BOOST_PP_IS_ITERATING)
  41 # error Boost.Parameters - do not include this file!
  42 #endif
  43
  44 #define N BOOST_PP_ITERATION()
  45
  46 #define BOOST_PARAMETER_open_list(z, n, text) \
  47     aux::item< \
  48         BOOST_PP_CAT(PS, n), BOOST_PP_CAT(A, n)
  49
  50 #define BOOST_PARAMETER_close_list(z, n, text) >
  51
  52 #define BOOST_PARAMETER_arg_list(n) \
  53     aux::make_arg_list< \
  54         BOOST_PP_ENUM(N, BOOST_PARAMETER_open_list, _) \
  55       , void_ \
  56         BOOST_PP_REPEAT(N, BOOST_PARAMETER_close_list, _) \
  57       , deduced_list \
  58       , aux::tag_keyword_arg \
  59     >
  60
  61 #define BOOST_PARAMETER_arg_pack_init(z, n, limit) \
  62     BOOST_PP_CAT(a, BOOST_PP_SUB(limit,n))
  63
  64 template<BOOST_PP_ENUM_PARAMS(N, class A)>
  65 typename mpl::first<
  66     typename BOOST_PARAMETER_arg_list(N)::type
  67 >::type
  68 operator()(BOOST_PP_ENUM_BINARY_PARAMS(N, A, & a)) const
  69 {
  70     typedef typename BOOST_PARAMETER_arg_list(N)::type result;
  71
  72     typedef typename mpl::first<result>::type result_type;
  73     typedef typename mpl::second<result>::type error;
  74     error();
  75
  76     return result_type(
  77         BOOST_PP_ENUM(N, BOOST_PARAMETER_arg_pack_init, BOOST_PP_DEC(N))
  78         BOOST_PP_ENUM_TRAILING_PARAMS(
  79             BOOST_PP_SUB(BOOST_PARAMETER_MAX_ARITY, N)
  80           , aux::void_reference() BOOST_PP_INTERCEPT
  81         ));
  82 }
  83
  84 #undef BOOST_PARAMETER_arg_list
  85 #undef BOOST_PARAMETER_open_list
  86 #undef BOOST_PARAMETER_close_list
  87 #undef N
  88