default.hpp

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#ifndef BOOST_PP_IS_ITERATING
    ///////////////////////////////////////////////////////////////////////////////
    /// \file default.hpp
    /// Contains definition of the _default transform, which gives operators their
    /// usual C++ meanings and uses Boost.Typeof to deduce return types.
    //
    //  Copyright 2008 Eric Niebler. 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)

    #ifndef BOOST_PROTO_TRANSFORM_DEFAULT_HPP_EAN_04_04_2008
    #define BOOST_PROTO_TRANSFORM_DEFAULT_HPP_EAN_04_04_2008

    #include <boost/proto/detail/prefix.hpp>
    #include <boost/preprocessor/iteration/iterate.hpp>
    #include <boost/preprocessor/repetition/repeat.hpp>
    #include <boost/preprocessor/repetition/enum_shifted.hpp>
    #include <boost/preprocessor/repetition/enum_shifted_params.hpp>
    #include <boost/ref.hpp>
    #include <boost/get_pointer.hpp>
    #include <boost/utility/enable_if.hpp>
    #include <boost/type_traits/is_member_pointer.hpp>
    #include <boost/type_traits/is_member_object_pointer.hpp>
    #include <boost/type_traits/is_member_function_pointer.hpp>
    #include <boost/proto/proto_fwd.hpp>
    #include <boost/proto/traits.hpp>
    #include <boost/proto/transform/impl.hpp>
    #include <boost/proto/transform/arg.hpp>
    #include <boost/proto/detail/decltype.hpp>
    #include <boost/proto/detail/suffix.hpp>

    namespace boost { namespace proto
    {
        template<typename Grammar>
        struct _default
          : transform<_default<Grammar> >
        {
            template<typename Expr, typename State, typename Data, typename Tag, long Arity>
            struct impl2;

            template<typename Expr, typename State, typename Data>
            struct impl2<Expr, State, Data, tag::terminal, 0>
              : _value::impl<Expr, State, Data>
            {};

            #define BOOST_PROTO_UNARY_OP_RESULT(OP, TAG, MAKE)                                      \
            template<typename Expr, typename State, typename Data>                                  \
            struct impl2<Expr, State, Data, TAG, 1>                                                 \
              : transform_impl<Expr, State, Data>                                                   \
            {                                                                                       \
            private:                                                                                \
                typedef typename result_of::child_c<Expr, 0>::type e0;                              \
                typedef typename Grammar::template impl<e0, State, Data>::result_type r0;           \
            public:                                                                                 \
                BOOST_PROTO_DECLTYPE_(OP proto::detail::MAKE<r0>(), result_type)                    \
                result_type operator ()(                                                            \
                    typename impl2::expr_param expr                                                 \
                  , typename impl2::state_param state                                               \
                  , typename impl2::data_param data                                                 \
                ) const                                                                             \
                {                                                                                   \
                    typename Grammar::template impl<e0, State, Data> t0;                            \
                    return OP t0(proto::child_c<0>(expr), state, data);                             \
                }                                                                                   \
            };                                                                                      \
            /**/

            #define BOOST_PROTO_BINARY_OP_RESULT(OP, TAG, LMAKE, RMAKE)                             \
            template<typename Expr, typename State, typename Data>                                  \
            struct impl2<Expr, State, Data, TAG, 2>                                                 \
              : transform_impl<Expr, State, Data>                                                   \
            {                                                                                       \
            private:                                                                                \
                typedef typename result_of::child_c<Expr, 0>::type e0;                              \
                typedef typename result_of::child_c<Expr, 1>::type e1;                              \
                typedef typename Grammar::template impl<e0, State, Data>::result_type r0;           \
                typedef typename Grammar::template impl<e1, State, Data>::result_type r1;           \
            public:                                                                                 \
                BOOST_PROTO_DECLTYPE_(                                                              \
                    proto::detail::LMAKE<r0>() OP proto::detail::RMAKE<r1>()                        \
                  , result_type                                                                     \
                )                                                                                   \
                result_type operator ()(                                                            \
                    typename impl2::expr_param expr                                                 \
                  , typename impl2::state_param state                                               \
                  , typename impl2::data_param data                                                 \
                ) const                                                                             \
                {                                                                                   \
                    typename Grammar::template impl<e0, State, Data> t0;                            \
                    typename Grammar::template impl<e1, State, Data> t1;                            \
                    return t0(proto::child_c<0>(expr), state, data)                                 \
                        OP t1(proto::child_c<1>(expr), state, data);                                \
                }                                                                                   \
            };                                                                                      \
            /**/

            BOOST_PROTO_UNARY_OP_RESULT(+, tag::unary_plus, make)
            BOOST_PROTO_UNARY_OP_RESULT(-, tag::negate, make)
            BOOST_PROTO_UNARY_OP_RESULT(*, tag::dereference, make)
            BOOST_PROTO_UNARY_OP_RESULT(~, tag::complement, make)
            BOOST_PROTO_UNARY_OP_RESULT(&, tag::address_of, make)
            BOOST_PROTO_UNARY_OP_RESULT(!, tag::logical_not, make)
            BOOST_PROTO_UNARY_OP_RESULT(++, tag::pre_inc, make_mutable)
            BOOST_PROTO_UNARY_OP_RESULT(--, tag::pre_dec, make_mutable)

            BOOST_PROTO_BINARY_OP_RESULT(<<, tag::shift_left, make_mutable, make)
            BOOST_PROTO_BINARY_OP_RESULT(>>, tag::shift_right, make_mutable, make_mutable)
            BOOST_PROTO_BINARY_OP_RESULT(*, tag::multiplies, make, make)
            BOOST_PROTO_BINARY_OP_RESULT(/, tag::divides, make, make)
            BOOST_PROTO_BINARY_OP_RESULT(%, tag::modulus, make, make)
            BOOST_PROTO_BINARY_OP_RESULT(+, tag::plus, make, make)
            BOOST_PROTO_BINARY_OP_RESULT(-, tag::minus, make, make)
            BOOST_PROTO_BINARY_OP_RESULT(<, tag::less, make, make)
            BOOST_PROTO_BINARY_OP_RESULT(>, tag::greater, make, make)
            BOOST_PROTO_BINARY_OP_RESULT(<=, tag::less_equal, make, make)
            BOOST_PROTO_BINARY_OP_RESULT(>=, tag::greater_equal, make, make)
            BOOST_PROTO_BINARY_OP_RESULT(==, tag::equal_to, make, make)
            BOOST_PROTO_BINARY_OP_RESULT(!=, tag::not_equal_to, make, make)
            BOOST_PROTO_BINARY_OP_RESULT(||, tag::logical_or, make, make)
            BOOST_PROTO_BINARY_OP_RESULT(&&, tag::logical_and, make, make)
            BOOST_PROTO_BINARY_OP_RESULT(&, tag::bitwise_and, make, make)
            BOOST_PROTO_BINARY_OP_RESULT(|, tag::bitwise_or, make, make)
            BOOST_PROTO_BINARY_OP_RESULT(^, tag::bitwise_xor, make, make)

            BOOST_PROTO_BINARY_OP_RESULT(=, tag::assign, make_mutable, make)
            BOOST_PROTO_BINARY_OP_RESULT(<<=, tag::shift_left_assign, make_mutable, make)
            BOOST_PROTO_BINARY_OP_RESULT(>>=, tag::shift_right_assign, make_mutable, make)
            BOOST_PROTO_BINARY_OP_RESULT(*=, tag::multiplies_assign, make_mutable, make)
            BOOST_PROTO_BINARY_OP_RESULT(/=, tag::divides_assign, make_mutable, make)
            BOOST_PROTO_BINARY_OP_RESULT(%=, tag::modulus_assign, make_mutable, make)
            BOOST_PROTO_BINARY_OP_RESULT(+=, tag::plus_assign, make_mutable, make)
            BOOST_PROTO_BINARY_OP_RESULT(-=, tag::minus_assign, make_mutable, make)
            BOOST_PROTO_BINARY_OP_RESULT(&=, tag::bitwise_and_assign, make_mutable, make)
            BOOST_PROTO_BINARY_OP_RESULT(|=, tag::bitwise_or_assign, make_mutable, make)
            BOOST_PROTO_BINARY_OP_RESULT(^=, tag::bitwise_xor_assign, make_mutable, make)

            #undef BOOST_PROTO_UNARY_OP_RESULT
            #undef BOOST_PROTO_BINARY_OP_RESULT

            /// INTERNAL ONLY
            template<typename Expr, typename State, typename Data>
            struct is_member_function_invocation
            {
                typedef typename result_of::child_c<Expr, 1>::type e1;
                typedef typename Grammar::template impl<e1, State, Data>::result_type r1;
                typedef typename remove_const<typename remove_reference<r1>::type>::type uncvref_r1;
                typedef typename is_member_function_pointer<uncvref_r1>::type type;
                BOOST_STATIC_CONSTANT(bool, value = type::value);
            };

            /// INTERNAL ONLY
            template<typename Expr, typename State, typename Data, bool IsMemFunCall>
            struct memfun_impl
              : transform_impl<Expr, State, Data>
            {
            private:
                typedef typename result_of::child_c<Expr, 0>::type e0;
                typedef typename result_of::child_c<Expr, 1>::type e1;
                typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
                typedef typename Grammar::template impl<e1, State, Data>::result_type r1;
            public:
                typedef typename detail::mem_ptr_fun<r0, r1>::result_type result_type;
                result_type operator ()(
                    typename memfun_impl::expr_param expr
                  , typename memfun_impl::state_param state
                  , typename memfun_impl::data_param data
                ) const
                {
                    typename Grammar::template impl<e0, State, Data> t0;
                    typename Grammar::template impl<e1, State, Data> t1;
                    return detail::mem_ptr_fun<r0, r1>()(
                        t0(proto::child_c<0>(expr), state, data)
                      , t1(proto::child_c<1>(expr), state, data)
                    );
                }
            };

            /// INTERNAL ONLY
            template<typename Expr, typename State, typename Data>
            struct memfun_impl<Expr, State, Data, true>
              : transform_impl<Expr, State, Data>
            {
            private:
                typedef typename result_of::child_c<Expr, 0>::type e0;
                typedef typename result_of::child_c<Expr, 1>::type e1;
                typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
                typedef typename Grammar::template impl<e1, State, Data>::result_type r1;
            public:
                typedef detail::memfun<r0, r1> result_type;
                result_type const operator ()(
                    typename memfun_impl::expr_param expr
                  , typename memfun_impl::state_param state
                  , typename memfun_impl::data_param data
                ) const
                {
                    typename Grammar::template impl<e0, State, Data> t0;
                    typename Grammar::template impl<e1, State, Data> t1;
                    return detail::memfun<r0, r1>(
                        t0(proto::child_c<0>(expr), state, data)
                      , t1(proto::child_c<1>(expr), state, data)
                    );
                }
            };

            template<typename Expr, typename State, typename Data>
            struct impl2<Expr, State, Data, tag::mem_ptr, 2>
              : memfun_impl<Expr, State, Data, is_member_function_invocation<Expr, State, Data>::value>
            {};

            template<typename Expr, typename State, typename Data>
            struct impl2<Expr, State, Data, tag::post_inc, 1>
              : transform_impl<Expr, State, Data>
            {
            private:
                typedef typename result_of::child_c<Expr, 0>::type e0;
                typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
            public:
                BOOST_PROTO_DECLTYPE_(proto::detail::make_mutable<r0>() ++, result_type)
                result_type operator ()(
                    typename impl2::expr_param expr
                  , typename impl2::state_param state
                  , typename impl2::data_param data
                ) const
                {
                    typename Grammar::template impl<e0, State, Data> t0;
                    return t0(proto::child_c<0>(expr), state, data) ++;
                }
            };

            template<typename Expr, typename State, typename Data>
            struct impl2<Expr, State, Data, tag::post_dec, 1>
              : transform_impl<Expr, State, Data>
            {
            private:
                typedef typename result_of::child_c<Expr, 0>::type e0;
                typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
            public:
                BOOST_PROTO_DECLTYPE_(proto::detail::make_mutable<r0>() --, result_type)
                result_type operator ()(
                    typename impl2::expr_param expr
                  , typename impl2::state_param state
                  , typename impl2::data_param data
                ) const
                {
                    typename Grammar::template impl<e0, State, Data> t0;
                    return t0(proto::child_c<0>(expr), state, data) --;
                }
            };

            template<typename Expr, typename State, typename Data>
            struct impl2<Expr, State, Data, tag::subscript, 2>
              : transform_impl<Expr, State, Data>
            {
            private:
                typedef typename result_of::child_c<Expr, 0>::type e0;
                typedef typename result_of::child_c<Expr, 1>::type e1;
                typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
                typedef typename Grammar::template impl<e1, State, Data>::result_type r1;
            public:
                BOOST_PROTO_DECLTYPE_(
                    proto::detail::make_subscriptable<r0>() [ proto::detail::make<r1>() ]
                  , result_type
                )