boost/proto/transform/default.hpp
/////////////////////////////////////////////////////////////////////////////// /// \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/preprocessor/iteration/iterate.hpp> #include <boost/preprocessor/repetition/repeat.hpp> #include <boost/preprocessor/arithmetic/add.hpp> #include <boost/preprocessor/arithmetic/sub.hpp> #include <boost/preprocessor/repetition/enum.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> namespace boost { namespace proto { namespace detail { template<typename Grammar, typename Tag> struct default_case : not_<_> {}; template<typename Grammar> struct default_case<Grammar, tag::terminal> : when<terminal<_>, _value> {}; template<typename Grammar> struct default_cases { template<typename Tag> struct case_ : default_case<Grammar, Tag> {}; }; #define BOOST_PROTO_UNARY_DEFAULT_EVAL(OP, TAG, MAKE) \ template<typename Grammar> \ struct BOOST_PP_CAT(default_, TAG) \ : transform<BOOST_PP_CAT(default_, TAG)<Grammar> > \ { \ template<typename Expr, typename State, typename Data> \ struct impl \ : 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 impl::expr_param e \ , typename impl::state_param s \ , typename impl::data_param d \ ) const \ { \ typename Grammar::template impl<e0, State, Data> t0; \ return OP t0(proto::child_c<0>(e), s, d); \ } \ }; \ }; \ \ template<typename Grammar> \ struct default_case<Grammar, tag::TAG> \ : when<unary_expr<tag::TAG, Grammar>, BOOST_PP_CAT(default_, TAG)<Grammar> > \ {}; \ /**/ #define BOOST_PROTO_BINARY_DEFAULT_EVAL(OP, TAG, LMAKE, RMAKE) \ template<typename Grammar> \ struct BOOST_PP_CAT(default_, TAG) \ : transform<BOOST_PP_CAT(default_, TAG)<Grammar> > \ { \ template<typename Expr, typename State, typename Data> \ struct 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: \ BOOST_PROTO_DECLTYPE_( \ proto::detail::LMAKE<r0>() OP proto::detail::RMAKE<r1>() \ , result_type \ ) \ result_type operator ()( \ typename impl::expr_param e \ , typename impl::state_param s \ , typename impl::data_param d \ ) const \ { \ typename Grammar::template impl<e0, State, Data> t0; \ typename Grammar::template impl<e1, State, Data> t1; \ return t0(proto::child_c<0>(e), s, d) \ OP t1(proto::child_c<1>(e), s, d); \ } \ }; \ }; \ \ template<typename Grammar> \ struct default_case<Grammar, tag::TAG> \ : when<binary_expr<tag::TAG, Grammar, Grammar>, BOOST_PP_CAT(default_, TAG)<Grammar> > \ {}; \ /**/ BOOST_PROTO_UNARY_DEFAULT_EVAL(+, unary_plus, make) BOOST_PROTO_UNARY_DEFAULT_EVAL(-, negate, make) BOOST_PROTO_UNARY_DEFAULT_EVAL(*, dereference, make) BOOST_PROTO_UNARY_DEFAULT_EVAL(~, complement, make) BOOST_PROTO_UNARY_DEFAULT_EVAL(&, address_of, make) BOOST_PROTO_UNARY_DEFAULT_EVAL(!, logical_not, make) BOOST_PROTO_UNARY_DEFAULT_EVAL(++, pre_inc, make_mutable) BOOST_PROTO_UNARY_DEFAULT_EVAL(--, pre_dec, make_mutable) BOOST_PROTO_BINARY_DEFAULT_EVAL(<<, shift_left, make_mutable, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(>>, shift_right, make_mutable, make_mutable) BOOST_PROTO_BINARY_DEFAULT_EVAL(*, multiplies, make, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(/, divides, make, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(%, modulus, make, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(+, plus, make, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(-, minus, make, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(<, less, make, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(>, greater, make, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(<=, less_equal, make, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(>=, greater_equal, make, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(==, equal_to, make, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(!=, not_equal_to, make, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(||, logical_or, make, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(&&, logical_and, make, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(&, bitwise_and, make, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(|, bitwise_or, make, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(^, bitwise_xor, make, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(=, assign, make_mutable, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(<<=, shift_left_assign, make_mutable, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(>>=, shift_right_assign, make_mutable, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(*=, multiplies_assign, make_mutable, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(/=, divides_assign, make_mutable, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(%=, modulus_assign, make_mutable, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(+=, plus_assign, make_mutable, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(-=, minus_assign, make_mutable, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(&=, bitwise_and_assign, make_mutable, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(|=, bitwise_or_assign, make_mutable, make) BOOST_PROTO_BINARY_DEFAULT_EVAL(^=, bitwise_xor_assign, make_mutable, make) #undef BOOST_PROTO_UNARY_DEFAULT_EVAL #undef BOOST_PROTO_BINARY_DEFAULT_EVAL /// INTERNAL ONLY template<typename Grammar, typename Expr, typename State, typename Data> struct is_member_function_invocation : is_member_function_pointer< typename uncvref< typename Grammar::template impl< typename result_of::child_c<Expr, 1>::type , State , Data >::result_type >::type > {}; /// INTERNAL ONLY template<typename Grammar, typename Expr, typename State, typename Data, bool IsMemFunCall> struct default_mem_ptr_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 default_mem_ptr_impl::expr_param e , typename default_mem_ptr_impl::state_param s , typename default_mem_ptr_impl::data_param d ) 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>(e), s, d) , t1(proto::child_c<1>(e), s, d) ); } }; /// INTERNAL ONLY template<typename Grammar, typename Expr, typename State, typename Data> struct default_mem_ptr_impl<Grammar, 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 default_mem_ptr_impl::expr_param e , typename default_mem_ptr_impl::state_param s , typename default_mem_ptr_impl::data_param d ) 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>(e), s, d) , t1(proto::child_c<1>(e), s, d) ); } }; template<typename Grammar> struct default_mem_ptr : transform<default_mem_ptr<Grammar> > { template<typename Expr, typename State, typename Data> struct impl : default_mem_ptr_impl< Grammar , Expr , State , Data , is_member_function_invocation<Grammar, Expr, State, Data>::value > {}; }; template<typename Grammar> struct default_case<Grammar, tag::mem_ptr> : when<mem_ptr<Grammar, Grammar>, default_mem_ptr<Grammar> > {}; template<typename Grammar> struct default_post_inc : transform<default_post_inc<Grammar> > { template<typename Expr, typename State, typename Data> struct impl : 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 impl::expr_param e , typename impl::state_param s , typename impl::data_param d ) const { typename Grammar::template impl<e0, State, Data> t0; return t0(proto::child_c<0>(e), s, d) ++; } }; }; template<typename Grammar> struct default_case<Grammar, tag::post_inc> : when<post_inc<Grammar>, default_post_inc<Grammar> > {}; template<typename Grammar> struct default_post_dec : transform<default_post_dec<Grammar> > { template<typename Expr, typename State, typename Data> struct impl : 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 impl::expr_param e , typename impl::state_param s , typename impl::data_param d ) const { typename Grammar::template impl<e0, State, Data> t0; return t0(proto::child_c<0>(e), s, d) --; } }; }; template<typename Grammar> struct default_case<Grammar, tag::post_dec> : when<post_dec<Grammar>, default_post_dec<Grammar> > {}; template<typename Grammar> struct default_subscript : transform<default_subscript<Grammar> > { template<typename Expr, typename State, typename Data> struct 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: BOOST_PROTO_DECLTYPE_( proto::detail::make_subscriptable<r0>() [ proto::detail::make<r1>() ] , result_type ) result_type operator ()( typename impl::expr_param e , typename impl::state_param s , typename impl::data_param d ) const { typename Grammar::template impl<e0, State, Data> t0; typename Grammar::template impl<e1, State, Data> t1; return t0(proto::child_c<0>(e), s, d) [ t1(proto::child_c<1>(e), s, d) ]; } }; }; template<typename Grammar> struct default_case<Grammar, tag::subscript> : when<subscript<Grammar, Grammar>, default_subscript<Grammar> > {}; template<typename Grammar> struct default_if_else_ { template<typename Expr, typename State, typename Data> struct 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 result_of::child_c<Expr, 2>::type e2; typedef typename Grammar::template impl<e0, State, Data>::result_type r0; typedef typename Grammar::template impl<e1, State, Data>::result_type r1; typedef typename Grammar::template impl<e2, State, Data>::result_type r2; public: BOOST_PROTO_DECLTYPE_( proto::detail::make<r0>() ? proto::detail::make<r1>() : proto::detail::make<r2>() , result_type ) result_type operator ()( typename impl::expr_param e , typename impl::state_param s , typename impl::data_param d ) const { typename Grammar::template impl<e0, State, Data> t0; typename Grammar::template impl<e1, State, Data> t1; typename Grammar::template impl<e2, State, Data> t2; return t0(proto::child_c<0>(e), s, d) ? t1(proto::child_c<1>(e), s, d) : t2(proto::child_c<2>(e), s, d); } }; }; template<typename Grammar> struct default_case<Grammar, tag::if_else_> : when<if_else_<Grammar, Grammar, Grammar>, default_if_else_<Grammar> > {}; template<typename Grammar> struct default_comma : transform<default_comma<Grammar> > { template<typename Expr, typename State, typename Data> struct 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 proto::detail::comma_result<r0, r1>::type result_type; result_type operator ()( typename impl::expr_param e , typename impl::state_param s , typename impl::data_param d ) const { typename Grammar::template impl<e0, State, Data> t0; typename Grammar::template impl<e1, State, Data> t1; return t0(proto::child_c<0>(e), s, d) , t1(proto::child_c<1>(e), s, d); } }; }; template<typename Grammar> struct default_case<Grammar, tag::comma> : when<comma<Grammar, Grammar>, default_comma<Grammar> > {}; template<typename Grammar, typename Expr, typename State, typename Data, long Arity> struct default_function_impl; template<typename Grammar> struct default_function : transform<default_function<Grammar> > { template<typename Expr, typename State, typename Data> struct impl : default_function_impl< Grammar , Expr , State , Data , transform_impl<Expr, State, Data>::expr::proto_arity_c > {}; }; template<typename Grammar> struct default_case<Grammar, tag::function> : when<function<Grammar, vararg<Grammar> >, default_function<Grammar> > {}; #define BOOST_PROTO_DEFAULT_EVAL_TYPE(Z, N, DATA) \ typedef \ typename result_of::child_c<DATA, N>::type \ BOOST_PP_CAT(e, N); \ \ typedef \ typename Grammar::template impl<BOOST_PP_CAT(e, N), State, Data>::result_type \ BOOST_PP_CAT(r, N); \ /**/ #define BOOST_PROTO_DEFAULT_EVAL(Z, N, DATA) \ typename Grammar::template impl<BOOST_PP_CAT(e, N), State, Data>()( \ proto::child_c<N>(DATA), s, d \ ) \ /**/ template<typename Grammar, typename Expr, typename State, typename Data> struct default_function_impl<Grammar, Expr, State, Data, 1> : transform_impl<Expr, State, Data> { BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr) typedef typename proto::detail::result_of_fixup<r0>::type function_type; typedef typename BOOST_PROTO_RESULT_OF<function_type()>::type result_type; result_type operator ()( typename default_function_impl::expr_param e , typename default_function_impl::state_param s , typename default_function_impl::data_param d ) const { return BOOST_PROTO_DEFAULT_EVAL(~, 0, e)(); } }; template<typename Grammar, typename Expr, typename State, typename Data> struct default_function_impl<Grammar, Expr, State, Data, 2> : transform_impl<Expr, State, Data> { BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr) BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 1, Expr) typedef typename proto::detail::result_of_fixup<r0>::type function_type; typedef typename detail::result_of_<function_type(r1)>::type result_type; result_type operator ()( typename default_function_impl::expr_param e , typename default_function_impl::state_param s , typename default_function_impl::data_param d ) const { return this->invoke( e , s , d , is_member_function_pointer<function_type>() , is_member_object_pointer<function_type>() ); } private: result_type invoke( typename default_function_impl::expr_param e , typename default_function_impl::state_param s , typename default_function_impl::data_param d , mpl::false_ , mpl::false_ ) const { return BOOST_PROTO_DEFAULT_EVAL(~, 0, e)(BOOST_PROTO_DEFAULT_EVAL(~, 1, e)); } result_type invoke( typename default_function_impl::expr_param e , typename default_function_impl::state_param s , typename default_function_impl::data_param d , mpl::true_ , mpl::false_ ) const { BOOST_PROTO_USE_GET_POINTER(); typedef typename detail::class_member_traits<function_type>::class_type class_type; return ( BOOST_PROTO_GET_POINTER(class_type, (BOOST_PROTO_DEFAULT_EVAL(~, 1, e))) ->* BOOST_PROTO_DEFAULT_EVAL(~, 0, e) )(); } result_type invoke( typename default_function_impl::expr_param e , typename default_function_impl::state_param s , typename default_function_impl::data_param d , mpl::false_ , mpl::true_ ) const { BOOST_PROTO_USE_GET_POINTER(); typedef typename detail::class_member_traits<function_type>::class_type class_type; return ( BOOST_PROTO_GET_POINTER(class_type, (BOOST_PROTO_DEFAULT_EVAL(~, 1, e))) ->* BOOST_PROTO_DEFAULT_EVAL(~, 0, e) ); } }; #include <boost/proto/transform/detail/default_function_impl.hpp> #undef BOOST_PROTO_DEFAULT_EVAL_TYPE #undef BOOST_PROTO_DEFAULT_EVAL } template<typename Grammar /*= detail::_default*/> struct _default : switch_<detail::default_cases<Grammar> > {}; template<typename Grammar> struct is_callable<_default<Grammar> > : mpl::true_ {}; namespace detail { // Loopy indirection that allows proto::_default<> to be // used without specifying a Grammar argument. struct _default : proto::_default<> {}; } }} #endif