Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: /// \file default.hpp
Chris@16: /// Contains definition of the _default transform, which gives operators their
Chris@16: /// usual C++ meanings and uses Boost.Typeof to deduce return types.
Chris@16: //
Chris@16: //  Copyright 2008 Eric Niebler. Distributed under the Boost
Chris@16: //  Software License, Version 1.0. (See accompanying file
Chris@16: //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_PROTO_TRANSFORM_DEFAULT_HPP_EAN_04_04_2008
Chris@16: #define BOOST_PROTO_TRANSFORM_DEFAULT_HPP_EAN_04_04_2008
Chris@16: 
Chris@16: #include <boost/preprocessor/iteration/iterate.hpp>
Chris@16: #include <boost/preprocessor/repetition/repeat.hpp>
Chris@16: #include <boost/preprocessor/arithmetic/add.hpp>
Chris@16: #include <boost/preprocessor/arithmetic/sub.hpp>
Chris@16: #include <boost/preprocessor/repetition/enum.hpp>
Chris@16: #include <boost/preprocessor/repetition/enum_shifted.hpp>
Chris@16: #include <boost/preprocessor/repetition/enum_shifted_params.hpp>
Chris@16: #include <boost/ref.hpp>
Chris@16: #include <boost/get_pointer.hpp>
Chris@16: #include <boost/utility/enable_if.hpp>
Chris@16: #include <boost/type_traits/is_member_pointer.hpp>
Chris@16: #include <boost/type_traits/is_member_object_pointer.hpp>
Chris@16: #include <boost/type_traits/is_member_function_pointer.hpp>
Chris@16: #include <boost/proto/proto_fwd.hpp>
Chris@16: #include <boost/proto/traits.hpp>
Chris@16: #include <boost/proto/transform/impl.hpp>
Chris@16: #include <boost/proto/transform/arg.hpp>
Chris@16: #include <boost/proto/detail/decltype.hpp>
Chris@16: 
Chris@16: namespace boost { namespace proto
Chris@16: {
Chris@16:     namespace detail
Chris@16:     {
Chris@16:         template<typename Grammar, typename Tag>
Chris@16:         struct default_case
Chris@16:           : not_<_>
Chris@16:         {};
Chris@16: 
Chris@16:         template<typename Grammar>
Chris@16:         struct default_case<Grammar, tag::terminal>
Chris@16:           : when<terminal<_>, _value>
Chris@16:         {};
Chris@16: 
Chris@16:         template<typename Grammar>
Chris@16:         struct default_cases
Chris@16:         {
Chris@16:             template<typename Tag>
Chris@16:             struct case_
Chris@16:               : default_case<Grammar, Tag>
Chris@16:             {};
Chris@16:         };
Chris@16: 
Chris@16:         #define BOOST_PROTO_UNARY_DEFAULT_EVAL(OP, TAG, MAKE)                                       \
Chris@16:         template<typename Grammar>                                                                  \
Chris@16:         struct BOOST_PP_CAT(default_, TAG)                                                          \
Chris@16:           : transform<BOOST_PP_CAT(default_, TAG)<Grammar> >                                        \
Chris@16:         {                                                                                           \
Chris@16:             template<typename Expr, typename State, typename Data>                                  \
Chris@16:             struct impl                                                                             \
Chris@16:               : transform_impl<Expr, State, Data>                                                   \
Chris@16:             {                                                                                       \
Chris@16:             private:                                                                                \
Chris@16:                 typedef typename result_of::child_c<Expr, 0>::type e0;                              \
Chris@16:                 typedef typename Grammar::template impl<e0, State, Data>::result_type r0;           \
Chris@16:             public:                                                                                 \
Chris@16:                 BOOST_PROTO_DECLTYPE_(OP proto::detail::MAKE<r0>(), result_type)                    \
Chris@16:                 result_type operator ()(                                                            \
Chris@16:                     typename impl::expr_param e                                                     \
Chris@16:                   , typename impl::state_param s                                                    \
Chris@16:                   , typename impl::data_param d                                                     \
Chris@16:                 ) const                                                                             \
Chris@16:                 {                                                                                   \
Chris@16:                     typename Grammar::template impl<e0, State, Data> t0;                            \
Chris@16:                     return OP t0(proto::child_c<0>(e), s, d);                                       \
Chris@16:                 }                                                                                   \
Chris@16:             };                                                                                      \
Chris@16:         };                                                                                          \
Chris@16:                                                                                                     \
Chris@16:         template<typename Grammar>                                                                  \
Chris@16:         struct default_case<Grammar, tag::TAG>                                                      \
Chris@16:           : when<unary_expr<tag::TAG, Grammar>, BOOST_PP_CAT(default_, TAG)<Grammar> >              \
Chris@16:         {};                                                                                         \
Chris@16:         /**/
Chris@16: 
Chris@16:         #define BOOST_PROTO_BINARY_DEFAULT_EVAL(OP, TAG, LMAKE, RMAKE)                              \
Chris@16:         template<typename Grammar>                                                                  \
Chris@16:         struct BOOST_PP_CAT(default_, TAG)                                                          \
Chris@16:           : transform<BOOST_PP_CAT(default_, TAG)<Grammar> >                                        \
Chris@16:         {                                                                                           \
Chris@16:             template<typename Expr, typename State, typename Data>                                  \
Chris@16:             struct impl                                                                             \
Chris@16:               : transform_impl<Expr, State, Data>                                                   \
Chris@16:             {                                                                                       \
Chris@16:             private:                                                                                \
Chris@16:                 typedef typename result_of::child_c<Expr, 0>::type e0;                              \
Chris@16:                 typedef typename result_of::child_c<Expr, 1>::type e1;                              \
Chris@16:                 typedef typename Grammar::template impl<e0, State, Data>::result_type r0;           \
Chris@16:                 typedef typename Grammar::template impl<e1, State, Data>::result_type r1;           \
Chris@16:             public:                                                                                 \
Chris@16:                 BOOST_PROTO_DECLTYPE_(                                                              \
Chris@16:                     proto::detail::LMAKE<r0>() OP proto::detail::RMAKE<r1>()                        \
Chris@16:                   , result_type                                                                     \
Chris@16:                 )                                                                                   \
Chris@16:                 result_type operator ()(                                                            \
Chris@16:                     typename impl::expr_param e                                                     \
Chris@16:                   , typename impl::state_param s                                                    \
Chris@16:                   , typename impl::data_param d                                                     \
Chris@16:                 ) const                                                                             \
Chris@16:                 {                                                                                   \
Chris@16:                     typename Grammar::template impl<e0, State, Data> t0;                            \
Chris@16:                     typename Grammar::template impl<e1, State, Data> t1;                            \
Chris@16:                     return t0(proto::child_c<0>(e), s, d)                                           \
Chris@16:                         OP t1(proto::child_c<1>(e), s, d);                                          \
Chris@16:                 }                                                                                   \
Chris@16:             };                                                                                      \
Chris@16:         };                                                                                          \
Chris@16:                                                                                                     \
Chris@16:         template<typename Grammar>                                                                  \
Chris@16:         struct default_case<Grammar, tag::TAG>                                                      \
Chris@16:           : when<binary_expr<tag::TAG, Grammar, Grammar>, BOOST_PP_CAT(default_, TAG)<Grammar> >    \
Chris@16:         {};                                                                                         \
Chris@16:         /**/
Chris@16: 
Chris@16:         BOOST_PROTO_UNARY_DEFAULT_EVAL(+, unary_plus, make)
Chris@16:         BOOST_PROTO_UNARY_DEFAULT_EVAL(-, negate, make)
Chris@16:         BOOST_PROTO_UNARY_DEFAULT_EVAL(*, dereference, make)
Chris@16:         BOOST_PROTO_UNARY_DEFAULT_EVAL(~, complement, make)
Chris@16:         BOOST_PROTO_UNARY_DEFAULT_EVAL(&, address_of, make)
Chris@16:         BOOST_PROTO_UNARY_DEFAULT_EVAL(!, logical_not, make)
Chris@16:         BOOST_PROTO_UNARY_DEFAULT_EVAL(++, pre_inc, make_mutable)
Chris@16:         BOOST_PROTO_UNARY_DEFAULT_EVAL(--, pre_dec, make_mutable)
Chris@16: 
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(<<, shift_left, make_mutable, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(>>, shift_right, make_mutable, make_mutable)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(*, multiplies, make, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(/, divides, make, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(%, modulus, make, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(+, plus, make, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(-, minus, make, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(<, less, make, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(>, greater, make, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(<=, less_equal, make, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(>=, greater_equal, make, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(==, equal_to, make, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(!=, not_equal_to, make, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(||, logical_or, make, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(&&, logical_and, make, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(&, bitwise_and, make, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(|, bitwise_or, make, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(^, bitwise_xor, make, make)
Chris@16: 
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(=, assign, make_mutable, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(<<=, shift_left_assign, make_mutable, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(>>=, shift_right_assign, make_mutable, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(*=, multiplies_assign, make_mutable, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(/=, divides_assign, make_mutable, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(%=, modulus_assign, make_mutable, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(+=, plus_assign, make_mutable, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(-=, minus_assign, make_mutable, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(&=, bitwise_and_assign, make_mutable, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(|=, bitwise_or_assign, make_mutable, make)
Chris@16:         BOOST_PROTO_BINARY_DEFAULT_EVAL(^=, bitwise_xor_assign, make_mutable, make)
Chris@16: 
Chris@16:         #undef BOOST_PROTO_UNARY_DEFAULT_EVAL
Chris@16:         #undef BOOST_PROTO_BINARY_DEFAULT_EVAL
Chris@16: 
Chris@16:         /// INTERNAL ONLY
Chris@16:         template<typename Grammar, typename Expr, typename State, typename Data>
Chris@16:         struct is_member_function_invocation
Chris@16:           : is_member_function_pointer<
Chris@16:                 typename uncvref<
Chris@16:                     typename Grammar::template impl<
Chris@16:                         typename result_of::child_c<Expr, 1>::type
Chris@16:                       , State
Chris@16:                       , Data
Chris@16:                     >::result_type
Chris@16:                 >::type
Chris@16:             >
Chris@16:         {};
Chris@16: 
Chris@16:         /// INTERNAL ONLY
Chris@16:         template<typename Grammar, typename Expr, typename State, typename Data, bool IsMemFunCall>
Chris@16:         struct default_mem_ptr_impl
Chris@16:           : transform_impl<Expr, State, Data>
Chris@16:         {
Chris@16:         private:
Chris@16:             typedef typename result_of::child_c<Expr, 0>::type e0;
Chris@16:             typedef typename result_of::child_c<Expr, 1>::type e1;
Chris@16:             typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
Chris@16:             typedef typename Grammar::template impl<e1, State, Data>::result_type r1;
Chris@16:         public:
Chris@16:             typedef typename detail::mem_ptr_fun<r0, r1>::result_type result_type;
Chris@16:             result_type operator ()(
Chris@16:                 typename default_mem_ptr_impl::expr_param e
Chris@16:               , typename default_mem_ptr_impl::state_param s
Chris@16:               , typename default_mem_ptr_impl::data_param d
Chris@16:             ) const
Chris@16:             {
Chris@16:                 typename Grammar::template impl<e0, State, Data> t0;
Chris@16:                 typename Grammar::template impl<e1, State, Data> t1;
Chris@16:                 return detail::mem_ptr_fun<r0, r1>()(
Chris@16:                     t0(proto::child_c<0>(e), s, d)
Chris@16:                   , t1(proto::child_c<1>(e), s, d)
Chris@16:                 );
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:         /// INTERNAL ONLY
Chris@16:         template<typename Grammar, typename Expr, typename State, typename Data>
Chris@16:         struct default_mem_ptr_impl<Grammar, Expr, State, Data, true>
Chris@16:           : transform_impl<Expr, State, Data>
Chris@16:         {
Chris@16:         private:
Chris@16:             typedef typename result_of::child_c<Expr, 0>::type e0;
Chris@16:             typedef typename result_of::child_c<Expr, 1>::type e1;
Chris@16:             typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
Chris@16:             typedef typename Grammar::template impl<e1, State, Data>::result_type r1;
Chris@16:         public:
Chris@16:             typedef detail::memfun<r0, r1> result_type;
Chris@16:             result_type const operator ()(
Chris@16:                 typename default_mem_ptr_impl::expr_param e
Chris@16:               , typename default_mem_ptr_impl::state_param s
Chris@16:               , typename default_mem_ptr_impl::data_param d
Chris@16:             ) const
Chris@16:             {
Chris@16:                 typename Grammar::template impl<e0, State, Data> t0;
Chris@16:                 typename Grammar::template impl<e1, State, Data> t1;
Chris@16:                 return detail::memfun<r0, r1>(
Chris@16:                     t0(proto::child_c<0>(e), s, d)
Chris@16:                   , t1(proto::child_c<1>(e), s, d)
Chris@16:                 );
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:         template<typename Grammar>
Chris@16:         struct default_mem_ptr
Chris@16:           : transform<default_mem_ptr<Grammar> >
Chris@16:         {
Chris@16:             template<typename Expr, typename State, typename Data>
Chris@16:             struct impl
Chris@16:               : default_mem_ptr_impl<
Chris@16:                     Grammar
Chris@16:                   , Expr
Chris@16:                   , State
Chris@16:                   , Data
Chris@16:                   , is_member_function_invocation<Grammar, Expr, State, Data>::value
Chris@16:                 >
Chris@16:             {};
Chris@16:         };
Chris@16: 
Chris@16:         template<typename Grammar>
Chris@16:         struct default_case<Grammar, tag::mem_ptr>
Chris@16:           : when<mem_ptr<Grammar, Grammar>, default_mem_ptr<Grammar> >
Chris@16:         {};
Chris@16: 
Chris@16:         template<typename Grammar>
Chris@16:         struct default_post_inc
Chris@16:           : transform<default_post_inc<Grammar> >
Chris@16:         {
Chris@16:             template<typename Expr, typename State, typename Data>
Chris@16:             struct impl
Chris@16:               : transform_impl<Expr, State, Data>
Chris@16:             {
Chris@16:             private:
Chris@16:                 typedef typename result_of::child_c<Expr, 0>::type e0;
Chris@16:                 typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
Chris@16:             public:
Chris@16:                 BOOST_PROTO_DECLTYPE_(proto::detail::make_mutable<r0>() ++, result_type)
Chris@16:                 result_type operator ()(
Chris@16:                     typename impl::expr_param e
Chris@16:                   , typename impl::state_param s
Chris@16:                   , typename impl::data_param d
Chris@16:                 ) const
Chris@16:                 {
Chris@16:                     typename Grammar::template impl<e0, State, Data> t0;
Chris@16:                     return t0(proto::child_c<0>(e), s, d) ++;
Chris@16:                 }
Chris@16:             };
Chris@16:         };
Chris@16: 
Chris@16:         template<typename Grammar>
Chris@16:         struct default_case<Grammar, tag::post_inc>
Chris@16:           : when<post_inc<Grammar>, default_post_inc<Grammar> >
Chris@16:         {};
Chris@16: 
Chris@16:         template<typename Grammar>
Chris@16:         struct default_post_dec
Chris@16:           : transform<default_post_dec<Grammar> >
Chris@16:         {
Chris@16:             template<typename Expr, typename State, typename Data>
Chris@16:             struct impl
Chris@16:               : transform_impl<Expr, State, Data>
Chris@16:             {
Chris@16:             private:
Chris@16:                 typedef typename result_of::child_c<Expr, 0>::type e0;
Chris@16:                 typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
Chris@16:             public:
Chris@16:                 BOOST_PROTO_DECLTYPE_(proto::detail::make_mutable<r0>() --, result_type)
Chris@16:                 result_type operator ()(
Chris@16:                     typename impl::expr_param e
Chris@16:                   , typename impl::state_param s
Chris@16:                   , typename impl::data_param d
Chris@16:                 ) const
Chris@16:                 {
Chris@16:                     typename Grammar::template impl<e0, State, Data> t0;
Chris@16:                     return t0(proto::child_c<0>(e), s, d) --;
Chris@16:                 }
Chris@16:             };
Chris@16:         };
Chris@16: 
Chris@16:         template<typename Grammar>
Chris@16:         struct default_case<Grammar, tag::post_dec>
Chris@16:           : when<post_dec<Grammar>, default_post_dec<Grammar> >
Chris@16:         {};
Chris@16: 
Chris@16:         template<typename Grammar>
Chris@16:         struct default_subscript
Chris@16:           : transform<default_subscript<Grammar> >
Chris@16:         {
Chris@16:             template<typename Expr, typename State, typename Data>
Chris@16:             struct impl
Chris@16:               : transform_impl<Expr, State, Data>
Chris@16:             {
Chris@16:             private:
Chris@16:                 typedef typename result_of::child_c<Expr, 0>::type e0;
Chris@16:                 typedef typename result_of::child_c<Expr, 1>::type e1;
Chris@16:                 typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
Chris@16:                 typedef typename Grammar::template impl<e1, State, Data>::result_type r1;
Chris@16:             public:
Chris@16:                 BOOST_PROTO_DECLTYPE_(
Chris@16:                     proto::detail::make_subscriptable<r0>() [ proto::detail::make<r1>() ]
Chris@16:                   , result_type
Chris@16:                 )
Chris@16:                 result_type operator ()(
Chris@16:                     typename impl::expr_param e
Chris@16:                   , typename impl::state_param s
Chris@16:                   , typename impl::data_param d
Chris@16:                 ) const
Chris@16:                 {
Chris@16:                     typename Grammar::template impl<e0, State, Data> t0;
Chris@16:                     typename Grammar::template impl<e1, State, Data> t1;
Chris@16:                     return t0(proto::child_c<0>(e), s, d) [
Chris@16:                             t1(proto::child_c<1>(e), s, d) ];
Chris@16:                 }
Chris@16:             };
Chris@16:         };
Chris@16: 
Chris@16:         template<typename Grammar>
Chris@16:         struct default_case<Grammar, tag::subscript>
Chris@16:           : when<subscript<Grammar, Grammar>, default_subscript<Grammar> >
Chris@16:         {};
Chris@16: 
Chris@16:         template<typename Grammar>
Chris@16:         struct default_if_else_
Chris@16:         {
Chris@16:             template<typename Expr, typename State, typename Data>
Chris@16:             struct impl
Chris@16:               : transform_impl<Expr, State, Data>
Chris@16:             {
Chris@16:             private:
Chris@16:                 typedef typename result_of::child_c<Expr, 0>::type e0;
Chris@16:                 typedef typename result_of::child_c<Expr, 1>::type e1;
Chris@16:                 typedef typename result_of::child_c<Expr, 2>::type e2;
Chris@16:                 typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
Chris@16:                 typedef typename Grammar::template impl<e1, State, Data>::result_type r1;
Chris@16:                 typedef typename Grammar::template impl<e2, State, Data>::result_type r2;
Chris@16:             public:
Chris@16:                 BOOST_PROTO_DECLTYPE_(
Chris@16:                     proto::detail::make<r0>()
Chris@16:                   ? proto::detail::make<r1>()
Chris@16:                   : proto::detail::make<r2>()
Chris@16:                   , result_type
Chris@16:                 )
Chris@16:                 result_type operator ()(
Chris@16:                     typename impl::expr_param e
Chris@16:                   , typename impl::state_param s
Chris@16:                   , typename impl::data_param d
Chris@16:                 ) const
Chris@16:                 {
Chris@16:                     typename Grammar::template impl<e0, State, Data> t0;
Chris@16:                     typename Grammar::template impl<e1, State, Data> t1;
Chris@16:                     typename Grammar::template impl<e2, State, Data> t2;
Chris@16:                     return t0(proto::child_c<0>(e), s, d)
Chris@16:                           ? t1(proto::child_c<1>(e), s, d)
Chris@16:                           : t2(proto::child_c<2>(e), s, d);
Chris@16:                 }
Chris@16:             };
Chris@16:         };
Chris@16: 
Chris@16:         template<typename Grammar>
Chris@16:         struct default_case<Grammar, tag::if_else_>
Chris@16:           : when<if_else_<Grammar, Grammar, Grammar>, default_if_else_<Grammar> >
Chris@16:         {};
Chris@16: 
Chris@16:         template<typename Grammar>
Chris@16:         struct default_comma
Chris@16:           : transform<default_comma<Grammar> >
Chris@16:         {
Chris@16:             template<typename Expr, typename State, typename Data>
Chris@16:             struct impl
Chris@16:               : transform_impl<Expr, State, Data>
Chris@16:             {
Chris@16:             private:
Chris@16:                 typedef typename result_of::child_c<Expr, 0>::type e0;
Chris@16:                 typedef typename result_of::child_c<Expr, 1>::type e1;
Chris@16:                 typedef typename Grammar::template impl<e0, State, Data>::result_type r0;
Chris@16:                 typedef typename Grammar::template impl<e1, State, Data>::result_type r1;
Chris@16:             public:
Chris@16:                 typedef typename proto::detail::comma_result<r0, r1>::type result_type;
Chris@16:                 result_type operator ()(
Chris@16:                     typename impl::expr_param e
Chris@16:                   , typename impl::state_param s
Chris@16:                   , typename impl::data_param d
Chris@16:                 ) const
Chris@16:                 {
Chris@16:                     typename Grammar::template impl<e0, State, Data> t0;
Chris@16:                     typename Grammar::template impl<e1, State, Data> t1;
Chris@16:                     return t0(proto::child_c<0>(e), s, d)
Chris@16:                           , t1(proto::child_c<1>(e), s, d);
Chris@16:                 }
Chris@16:             };
Chris@16:         };
Chris@16: 
Chris@16:         template<typename Grammar>
Chris@16:         struct default_case<Grammar, tag::comma>
Chris@16:           : when<comma<Grammar, Grammar>, default_comma<Grammar> >
Chris@16:         {};
Chris@16: 
Chris@16:         template<typename Grammar, typename Expr, typename State, typename Data, long Arity>
Chris@16:         struct default_function_impl;
Chris@16: 
Chris@16:         template<typename Grammar>
Chris@16:         struct default_function
Chris@16:           : transform<default_function<Grammar> >
Chris@16:         {
Chris@16:             template<typename Expr, typename State, typename Data>
Chris@16:             struct impl
Chris@16:               : default_function_impl<
Chris@16:                     Grammar
Chris@16:                   , Expr
Chris@16:                   , State
Chris@16:                   , Data
Chris@16:                   , transform_impl<Expr, State, Data>::expr::proto_arity_c
Chris@16:                 >
Chris@16:             {};
Chris@16:         };
Chris@16: 
Chris@16:         template<typename Grammar>
Chris@16:         struct default_case<Grammar, tag::function>
Chris@16:           : when<function<Grammar, vararg<Grammar> >, default_function<Grammar> >
Chris@16:         {};
Chris@16: 
Chris@16:         #define BOOST_PROTO_DEFAULT_EVAL_TYPE(Z, N, DATA)                                       \
Chris@16:             typedef                                                                             \
Chris@16:                 typename result_of::child_c<DATA, N>::type                                      \
Chris@16:             BOOST_PP_CAT(e, N);                                                                 \
Chris@16:                                                                                                 \
Chris@16:             typedef                                                                             \
Chris@16:                 typename Grammar::template impl<BOOST_PP_CAT(e, N), State, Data>::result_type   \
Chris@16:             BOOST_PP_CAT(r, N);                                                                 \
Chris@16:             /**/
Chris@16: 
Chris@16:         #define BOOST_PROTO_DEFAULT_EVAL(Z, N, DATA)                                            \
Chris@16:             typename Grammar::template impl<BOOST_PP_CAT(e, N), State, Data>()(                 \
Chris@16:                 proto::child_c<N>(DATA), s, d                                                   \
Chris@16:             )                                                                                   \
Chris@16:             /**/
Chris@16: 
Chris@16:         template<typename Grammar, typename Expr, typename State, typename Data>
Chris@16:         struct default_function_impl<Grammar, Expr, State, Data, 1>
Chris@16:           : transform_impl<Expr, State, Data>
Chris@16:         {
Chris@16:             BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr)
Chris@16: 
Chris@16:             typedef
Chris@16:                 typename proto::detail::result_of_fixup<r0>::type
Chris@16:             function_type;
Chris@16: 
Chris@16:             typedef
Chris@16:                 typename BOOST_PROTO_RESULT_OF<function_type()>::type
Chris@16:             result_type;
Chris@16: 
Chris@16:             result_type operator ()(
Chris@16:                 typename default_function_impl::expr_param e
Chris@16:               , typename default_function_impl::state_param s
Chris@16:               , typename default_function_impl::data_param d
Chris@16:             ) const
Chris@16:             {
Chris@16:                 return BOOST_PROTO_DEFAULT_EVAL(~, 0, e)();
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:         template<typename Grammar, typename Expr, typename State, typename Data>
Chris@16:         struct default_function_impl<Grammar, Expr, State, Data, 2>
Chris@16:           : transform_impl<Expr, State, Data>
Chris@16:         {
Chris@16:             BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr)
Chris@16:             BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 1, Expr)
Chris@16: 
Chris@16:             typedef
Chris@16:                 typename proto::detail::result_of_fixup<r0>::type
Chris@16:             function_type;
Chris@16: 
Chris@16:             typedef
Chris@16:                 typename detail::result_of_<function_type(r1)>::type
Chris@16:             result_type;
Chris@16: 
Chris@16:             result_type operator ()(
Chris@16:                 typename default_function_impl::expr_param e
Chris@16:               , typename default_function_impl::state_param s
Chris@16:               , typename default_function_impl::data_param d
Chris@16:             ) const
Chris@16:             {
Chris@16:                 return this->invoke(
Chris@16:                     e
Chris@16:                   , s
Chris@16:                   , d
Chris@16:                   , is_member_function_pointer<function_type>()
Chris@16:                   , is_member_object_pointer<function_type>()
Chris@16:                 );
Chris@16:             }
Chris@16: 
Chris@16:         private:
Chris@16:             result_type invoke(
Chris@16:                 typename default_function_impl::expr_param e
Chris@16:               , typename default_function_impl::state_param s
Chris@16:               , typename default_function_impl::data_param d
Chris@16:               , mpl::false_
Chris@16:               , mpl::false_
Chris@16:             ) const
Chris@16:             {
Chris@16:                 return BOOST_PROTO_DEFAULT_EVAL(~, 0, e)(BOOST_PROTO_DEFAULT_EVAL(~, 1, e));
Chris@16:             }
Chris@16: 
Chris@16:             result_type invoke(
Chris@16:                 typename default_function_impl::expr_param e
Chris@16:               , typename default_function_impl::state_param s
Chris@16:               , typename default_function_impl::data_param d
Chris@16:               , mpl::true_
Chris@16:               , mpl::false_
Chris@16:             ) const
Chris@16:             {
Chris@16:                 BOOST_PROTO_USE_GET_POINTER();
Chris@16:                 typedef typename detail::class_member_traits<function_type>::class_type class_type;
Chris@16:                 return (
Chris@16:                     BOOST_PROTO_GET_POINTER(class_type, (BOOST_PROTO_DEFAULT_EVAL(~, 1, e))) ->* 
Chris@16:                     BOOST_PROTO_DEFAULT_EVAL(~, 0, e)
Chris@16:                 )();
Chris@16:             }
Chris@16: 
Chris@16:             result_type invoke(
Chris@16:                 typename default_function_impl::expr_param e
Chris@16:               , typename default_function_impl::state_param s
Chris@16:               , typename default_function_impl::data_param d
Chris@16:               , mpl::false_
Chris@16:               , mpl::true_
Chris@16:             ) const
Chris@16:             {
Chris@16:                 BOOST_PROTO_USE_GET_POINTER();
Chris@16:                 typedef typename detail::class_member_traits<function_type>::class_type class_type;
Chris@16:                 return (
Chris@16:                     BOOST_PROTO_GET_POINTER(class_type, (BOOST_PROTO_DEFAULT_EVAL(~, 1, e))) ->*
Chris@16:                     BOOST_PROTO_DEFAULT_EVAL(~, 0, e)
Chris@16:                 );
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:         #include <boost/proto/transform/detail/default_function_impl.hpp>
Chris@16: 
Chris@16:         #undef BOOST_PROTO_DEFAULT_EVAL_TYPE
Chris@16:         #undef BOOST_PROTO_DEFAULT_EVAL
Chris@16:     }
Chris@16: 
Chris@16:     template<typename Grammar /*= detail::_default*/>
Chris@16:     struct _default
Chris@16:       : switch_<detail::default_cases<Grammar> >
Chris@16:     {};
Chris@16: 
Chris@16:     template<typename Grammar>
Chris@16:     struct is_callable<_default<Grammar> >
Chris@16:       : mpl::true_
Chris@16:     {};
Chris@16: 
Chris@16:     namespace detail
Chris@16:     {
Chris@16:         // Loopy indirection that allows proto::_default<> to be
Chris@16:         // used without specifying a Grammar argument.
Chris@16:         struct _default
Chris@16:           : proto::_default<>
Chris@16:         {};
Chris@16:     }
Chris@16: 
Chris@16: }}
Chris@16: 
Chris@16: #endif
Chris@16: