boost_fusion/include/boost/fusion/adapted/class/adapt_class.hpp

/*=============================================================================
    Copyright (c) 2001-2009 Joel de Guzman
    Copyright (c) 2009-2010 Hartmut Kaiser

    Distributed under the Boost Software License, Version 1.0. (See accompanying
    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
==============================================================================*/
#if !defined(BOOST_FUSION_ADAPT_CLASS_OCTOBER_4_2009_840PM)
#define BOOST_FUSION_ADAPT_CLASS_OCTOBER_4_2009_840PM

#include <boost/fusion/support/tag_of_fwd.hpp>
#include <boost/fusion/adapted/class/extension.hpp>
#include <boost/fusion/adapted/class/class_iterator.hpp>
#include <boost/fusion/adapted/class/detail/is_view_impl.hpp>
#include <boost/fusion/adapted/class/detail/is_sequence_impl.hpp>
#include <boost/fusion/adapted/class/detail/category_of_impl.hpp>
#include <boost/fusion/adapted/class/detail/begin_impl.hpp>
#include <boost/fusion/adapted/class/detail/end_impl.hpp>
#include <boost/fusion/adapted/class/detail/size_impl.hpp>
#include <boost/fusion/adapted/class/detail/at_impl.hpp>
#include <boost/fusion/adapted/class/detail/value_at_impl.hpp>

#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/punctuation/comma_if.hpp>
#include <boost/preprocessor/seq/for_each_i.hpp>
#include <boost/preprocessor/tuple/elem.hpp>
#include <boost/preprocessor/repetition/enum_params_with_a_default.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/cat.hpp>
#include <boost/mpl/int.hpp>
#include <boost/config/no_tr1/utility.hpp>
#include <boost/type_traits/add_reference.hpp>
#include <boost/type_traits/add_const.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/type_traits/remove_const.hpp>

#define BOOST_FUSION_ADAPT_CLASS(name, bseq)                                    \
    BOOST_FUSION_ADAPT_CLASS_I(                                                 \
        name, BOOST_PP_CAT(BOOST_FUSION_ADAPT_CLASS_X bseq, 0))                 \
    /***/

#define BOOST_FUSION_ADAPT_CLASS_X(w, x, y, z) ((w, x, y, z)) BOOST_FUSION_ADAPT_CLASS_Y
#define BOOST_FUSION_ADAPT_CLASS_Y(w, x, y, z) ((w, x, y, z)) BOOST_FUSION_ADAPT_CLASS_X
#define BOOST_FUSION_ADAPT_CLASS_X0
#define BOOST_FUSION_ADAPT_CLASS_Y0

// BOOST_FUSION_ADAPT_CLASS_I generates the overarching structure and uses
// SEQ_FOR_EACH_I to generate the "linear" substructures.
// Thanks to Paul Mensonides for the PP macro help

#define BOOST_FUSION_ADAPT_CLASS_I(name, seq)                                   \
    namespace boost { namespace fusion { namespace traits                       \
    {                                                                           \
        template <>                                                             \
        struct tag_of<name>                                                     \
        {                                                                       \
            typedef class_tag type;                                             \
        };                                                                      \
    }}}                                                                         \
                                                                                \
    namespace boost { namespace mpl                                             \
    {                                                                           \
        template<typename>                                                      \
        struct sequence_tag;                                                    \
                                                                                \
        template<>                                                              \
        struct sequence_tag<name>                                               \
        {                                                                       \
            typedef fusion::fusion_sequence_tag type;                           \
        };                                                                      \
                                                                                \
        template<>                                                              \
        struct sequence_tag<name const>                                         \
        {                                                                       \
            typedef fusion::fusion_sequence_tag type;                           \
        };                                                                      \
    }}                                                                          \
                                                                                \
    namespace boost { namespace fusion { namespace extension                    \
    {                                                                           \
        template <>                                                             \
        struct class_size<name> : mpl::int_<BOOST_PP_SEQ_SIZE(seq)> {};         \
        template <typename T, int N> struct class_member_proxy;                 \
        BOOST_PP_SEQ_FOR_EACH_I(BOOST_FUSION_ADAPT_CLASS_C, name, seq)          \
    }}}                                                                         \
    /***/

#define BOOST_FUSION_ADAPT_CLASS_C(r, fullname, i, xy)                          \
    template <>                                                                 \
    struct class_member_proxy<fullname, i>                                      \
    {                                                                           \
        typedef BOOST_PP_TUPLE_ELEM(4, 0, xy) lvalue;                           \
        typedef BOOST_PP_TUPLE_ELEM(4, 1, xy) rvalue;                           \
        typedef remove_const<remove_reference<lvalue>::type>::type type;        \
        typedef add_reference<add_const<type>::type>::type cref_type;           \
                                                                                \
        class_member_proxy(fullname& obj) : obj(obj) {}                         \
        fullname& obj;                                                          \
                                                                                \
        class_member_proxy& operator=(cref_type val)                            \
        {                                                                       \
            BOOST_PP_TUPLE_ELEM(4, 3, xy);                                      \
            return *this;                                                       \
        }                                                                       \
                                                                                \
        operator lvalue()                                                       \
        {                                                                       \
            return BOOST_PP_TUPLE_ELEM(4, 2, xy);                               \
        }                                                                       \
    };                                                                          \
                                                                                \
    template <>                                                                 \
    struct class_member<fullname, i>                                            \
    {                                                                           \
        typedef class_member_proxy<fullname, i> proxy;                          \
        typedef proxy::type type;                                               \
        typedef proxy::rvalue get_type;                                         \
                                                                                \
        static get_type call(fullname const& obj)                               \
        {                                                                       \
            return BOOST_PP_TUPLE_ELEM(4, 2, xy);                               \
        }                                                                       \
                                                                                \
        static proxy call(fullname& obj)                                        \
        {                                                                       \
            return proxy(obj);                                                  \
        }                                                                       \
    };                                                                          \
    /***/


#endif