boost/mpl/arg.hpp

0001
0002 #if !defined(BOOST_PP_IS_ITERATING)
0003
0004 ///// header body
0005
0006 #ifndef BOOST_MPL_ARG_HPP_INCLUDED
0007 #define BOOST_MPL_ARG_HPP_INCLUDED
0008
0009 // Copyright Peter Dimov 2001-2002
0010 // Copyright Aleksey Gurtovoy 2001-2004
0011 //
0012 // Distributed under the Boost Software License, Version 1.0.
0013 // (See accompanying file LICENSE_1_0.txt or copy at
0014 // http://www.boost.org/LICENSE_1_0.txt)
0015 //
0016 // See http://www.boost.org/libs/mpl for documentation.
0017
0018 // $Id$
0019 // $Date$
0020 // $Revision$
0021
0022 #if !defined(BOOST_MPL_PREPROCESSING_MODE)
0023 #   include <boost/mpl/arg_fwd.hpp>
0024 #   include <boost/mpl/aux_/na.hpp>
0025 #   include <boost/mpl/aux_/na_assert.hpp>
0026 #   include <boost/mpl/aux_/arity_spec.hpp>
0027 #   include <boost/mpl/aux_/arg_typedef.hpp>
0028 #endif
0029
0030 #include <boost/mpl/aux_/config/static_constant.hpp>
0031 #include <boost/mpl/aux_/config/use_preprocessed.hpp>
0032
0033 #if !defined(BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS) \
0034     && !defined(BOOST_MPL_PREPROCESSING_MODE)
0035
0036 #   define BOOST_MPL_PREPROCESSED_HEADER arg.hpp
0037 #   include <boost/mpl/aux_/include_preprocessed.hpp>
0038
0039 #else
0040
0041 #   include <boost/mpl/limits/arity.hpp>
0042 #   include <boost/mpl/aux_/preprocessor/default_params.hpp>
0043 #   include <boost/mpl/aux_/preprocessor/params.hpp>
0044 #   include <boost/mpl/aux_/config/lambda.hpp>
0045 #   include <boost/mpl/aux_/config/dtp.hpp>
0046 #   include <boost/mpl/aux_/nttp_decl.hpp>
0047
0048 #   include <boost/preprocessor/iterate.hpp>
0049 #   include <boost/preprocessor/inc.hpp>
0050 #   include <boost/preprocessor/cat.hpp>
0051
0052 BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN
0053
0054 // local macro, #undef-ined at the end of the header
0055 #if !defined(BOOST_MPL_CFG_NO_DEFAULT_PARAMETERS_IN_NESTED_TEMPLATES)
0056 #   define AUX778076_ARG_N_DEFAULT_PARAMS(param,value) \
0057     BOOST_MPL_PP_DEFAULT_PARAMS( \
0058           BOOST_MPL_LIMIT_METAFUNCTION_ARITY \
0059         , param \
0060         , value \
0061         ) \
0062     /**/
0063 #else
0064 #   define AUX778076_ARG_N_DEFAULT_PARAMS(param,value) \
0065     BOOST_MPL_PP_PARAMS( \
0066           BOOST_MPL_LIMIT_METAFUNCTION_ARITY \
0067         , param \
0068         ) \
0069     /**/
0070 #endif
0071
0072 #define BOOST_PP_ITERATION_PARAMS_1 \
0073     (3,(0, BOOST_MPL_LIMIT_METAFUNCTION_ARITY, <boost/mpl/arg.hpp>))
0074 #include BOOST_PP_ITERATE()
0075
0076
0077 #   undef AUX778076_ARG_N_DEFAULT_PARAMS
0078
0079 BOOST_MPL_AUX_NONTYPE_ARITY_SPEC(1,int,arg)
0080
0081 BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_CLOSE
0082
0083 #endif // BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS
0084 #endif // BOOST_MPL_ARG_HPP_INCLUDED
0085
0086 ///// iteration
0087
0088 #else
0089 #define i_ BOOST_PP_FRAME_ITERATION(1)
0090
0091 #if i_ > 0
0092
0093 template<> struct arg<i_>
0094 {
0095     BOOST_STATIC_CONSTANT(int, value = i_);
0096     typedef arg<BOOST_PP_INC(i_)> next;
0097     BOOST_MPL_AUX_ARG_TYPEDEF(na, tag)
0098     BOOST_MPL_AUX_ARG_TYPEDEF(na, type)
0099
0100     template<
0101           AUX778076_ARG_N_DEFAULT_PARAMS(typename U, na)
0102         >
0103     struct apply
0104     {
0105         typedef BOOST_PP_CAT(U,i_) type;
0106         BOOST_MPL_AUX_ASSERT_NOT_NA(type);
0107     };
0108 };
0109
0110 #else
0111
0112 template<> struct arg<-1>
0113 {
0114     BOOST_STATIC_CONSTANT(int, value = -1);
0115     BOOST_MPL_AUX_ARG_TYPEDEF(na, tag)
0116     BOOST_MPL_AUX_ARG_TYPEDEF(na, type)
0117
0118     template<
0119           AUX778076_ARG_N_DEFAULT_PARAMS(typename U, na)
0120         >
0121     struct apply
0122     {
0123         typedef U1 type;
0124         BOOST_MPL_AUX_ASSERT_NOT_NA(type);
0125     };
0126 };
0127
0128 #endif // i_ > 0
0129
0130 #undef i_
0131 #endif // BOOST_PP_IS_ITERATING