boost/mpl/arg.hpp

   1
   2 #if !defined(BOOST_PP_IS_ITERATING)
   3
   4 ///// header body
   5
   6 #ifndef BOOST_MPL_ARG_HPP_INCLUDED
   7 #define BOOST_MPL_ARG_HPP_INCLUDED
   8
   9 // Copyright Peter Dimov 2001-2002
  10 // Copyright Aleksey Gurtovoy 2001-2004
  11 //
  12 // Distributed under the Boost Software License, Version 1.0.
  13 // (See accompanying file LICENSE_1_0.txt or copy at
  14 // http://www.boost.org/LICENSE_1_0.txt)
  15 //
  16 // See http://www.boost.org/libs/mpl for documentation.
  17
  18 // $Id: arg.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
  19 // $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
  20 // $Revision: 49267 $
  21
  22 #if !defined(BOOST_MPL_PREPROCESSING_MODE)
  23 #   include <boost/mpl/arg_fwd.hpp>
  24 #   include <boost/mpl/aux_/na.hpp>
  25 #   include <boost/mpl/aux_/na_assert.hpp>
  26 #   include <boost/mpl/aux_/arity_spec.hpp>
  27 #   include <boost/mpl/aux_/arg_typedef.hpp>
  28 #endif
  29
  30 #include <boost/mpl/aux_/config/static_constant.hpp>
  31 #include <boost/mpl/aux_/config/use_preprocessed.hpp>
  32
  33 #if !defined(BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS) \
  34     && !defined(BOOST_MPL_PREPROCESSING_MODE)
  35
  36 #   define BOOST_MPL_PREPROCESSED_HEADER arg.hpp
  37 #   include <boost/mpl/aux_/include_preprocessed.hpp>
  38
  39 #else
  40
  41 #   include <boost/mpl/limits/arity.hpp>
  42 #   include <boost/mpl/aux_/preprocessor/default_params.hpp>
  43 #   include <boost/mpl/aux_/preprocessor/params.hpp>
  44 #   include <boost/mpl/aux_/config/lambda.hpp>
  45 #   include <boost/mpl/aux_/config/dtp.hpp>
  46 #   include <boost/mpl/aux_/nttp_decl.hpp>
  47
  48 #   include <boost/preprocessor/iterate.hpp>
  49 #   include <boost/preprocessor/inc.hpp>
  50 #   include <boost/preprocessor/cat.hpp>
  51
  52 BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN
  53
  54 // local macro, #undef-ined at the end of the header
  55 #if !defined(BOOST_MPL_CFG_NO_DEFAULT_PARAMETERS_IN_NESTED_TEMPLATES)
  56 #   define AUX778076_ARG_N_DEFAULT_PARAMS(param,value) \
  57     BOOST_MPL_PP_DEFAULT_PARAMS( \
  58           BOOST_MPL_LIMIT_METAFUNCTION_ARITY \
  59         , param \
  60         , value \
  61         ) \
  62     /**/
  63 #else
  64 #   define AUX778076_ARG_N_DEFAULT_PARAMS(param,value) \
  65     BOOST_MPL_PP_PARAMS( \
  66           BOOST_MPL_LIMIT_METAFUNCTION_ARITY \
  67         , param \
  68         ) \
  69     /**/
  70 #endif
  71
  72 #define BOOST_PP_ITERATION_PARAMS_1 \
  73     (3,(0, BOOST_MPL_LIMIT_METAFUNCTION_ARITY, <boost/mpl/arg.hpp>))
  74 #include BOOST_PP_ITERATE()
  75
  76
  77 #   undef AUX778076_ARG_N_DEFAULT_PARAMS
  78
  79 BOOST_MPL_AUX_NONTYPE_ARITY_SPEC(1,int,arg)
  80
  81 BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_CLOSE
  82
  83 #endif // BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS
  84 #endif // BOOST_MPL_ARG_HPP_INCLUDED
  85
  86 ///// iteration
  87
  88 #else
  89 #define i_ BOOST_PP_FRAME_ITERATION(1)
  90
  91 #if i_ > 0
  92
  93 template<> struct arg<i_>
  94 {
  95     BOOST_STATIC_CONSTANT(int, value = i_);
  96     typedef arg<BOOST_PP_INC(i_)> next;
  97     BOOST_MPL_AUX_ARG_TYPEDEF(na, tag)
  98     BOOST_MPL_AUX_ARG_TYPEDEF(na, type)
  99
 100     template<
 101           AUX778076_ARG_N_DEFAULT_PARAMS(typename U, na)
 102         >
 103     struct apply
 104     {
 105         typedef BOOST_PP_CAT(U,i_) type;
 106         BOOST_MPL_AUX_ASSERT_NOT_NA(type);
 107     };
 108 };
 109
 110 #else
 111
 112 template<> struct arg<-1>
 113 {
 114     BOOST_STATIC_CONSTANT(int, value = -1);
 115     BOOST_MPL_AUX_ARG_TYPEDEF(na, tag)
 116     BOOST_MPL_AUX_ARG_TYPEDEF(na, type)
 117
 118     template<
 119           AUX778076_ARG_N_DEFAULT_PARAMS(typename U, na)
 120         >
 121     struct apply
 122     {
 123         typedef U1 type;
 124         BOOST_MPL_AUX_ASSERT_NOT_NA(type);
 125     };
 126 };
 127
 128 #endif // i_ > 0
 129
 130 #undef i_
 131 #endif // BOOST_PP_IS_ITERATING