| #ifndef BOOST_PP_IS_ITERATING | |
| /////////////////////////////////////////////////////////////////////////////// | |
| /// \file default.hpp | |
| /// Definintion of default_context, a default evaluation context for | |
| /// proto::eval() that uses Boost.Typeof to deduce return types | |
| /// of the built-in operators. | |
| // | |
| // 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_CONTEXT_DEFAULT_HPP_EAN_01_08_2007 | |
| #define BOOST_PROTO_CONTEXT_DEFAULT_HPP_EAN_01_08_2007 | |
| #include <boost/config.hpp> | |
| #include <boost/preprocessor/arithmetic/add.hpp> | |
| #include <boost/preprocessor/arithmetic/sub.hpp> | |
| #include <boost/preprocessor/iteration/iterate.hpp> | |
| #include <boost/preprocessor/repetition/enum.hpp> | |
| #include <boost/preprocessor/repetition/enum_shifted.hpp> | |
| #include <boost/utility/result_of.hpp> | |
| #include <boost/type_traits/is_const.hpp> | |
| #include <boost/type_traits/is_function.hpp> | |
| #include <boost/type_traits/remove_reference.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/tags.hpp> | |
| #include <boost/proto/eval.hpp> | |
| #include <boost/proto/traits.hpp> // for proto::child_c() | |
| #include <boost/proto/detail/decltype.hpp> | |
| namespace boost { namespace proto | |
| { | |
| /// INTERNAL ONLY | |
| /// | |
| #define UNREF(x) typename boost::remove_reference<x>::type | |
| namespace context | |
| { | |
| template< | |
| typename Expr | |
| , typename Context | |
| , typename Tag // = typename Expr::proto_tag | |
| , long Arity // = Expr::proto_arity_c | |
| > | |
| struct default_eval | |
| {}; | |
| template<typename Expr, typename Context> | |
| struct default_eval<Expr, Context, tag::terminal, 0> | |
| { | |
| typedef | |
| typename proto::result_of::value<Expr &>::type | |
| result_type; | |
| result_type operator ()(Expr &expr, Context &) const | |
| { | |
| return proto::value(expr); | |
| } | |
| }; | |
| /// INTERNAL ONLY | |
| /// | |
| #define BOOST_PROTO_UNARY_DEFAULT_EVAL(OP, TAG, MAKE) \ | |
| template<typename Expr, typename Context> \ | |
| struct default_eval<Expr, Context, TAG, 1> \ | |
| { \ | |
| private: \ | |
| typedef typename proto::result_of::child_c<Expr, 0>::type e0; \ | |
| typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; \ | |
| public: \ | |
| BOOST_PROTO_DECLTYPE_(OP proto::detail::MAKE<r0>(), result_type) \ | |
| result_type operator ()(Expr &expr, Context &ctx) const \ | |
| { \ | |
| return OP proto::eval(proto::child_c<0>(expr), ctx); \ | |
| } \ | |
| }; \ | |
| /**/ | |
| /// INTERNAL ONLY | |
| /// | |
| #define BOOST_PROTO_BINARY_DEFAULT_EVAL(OP, TAG, LMAKE, RMAKE) \ | |
| template<typename Expr, typename Context> \ | |
| struct default_eval<Expr, Context, TAG, 2> \ | |
| { \ | |
| private: \ | |
| typedef typename proto::result_of::child_c<Expr, 0>::type e0; \ | |
| typedef typename proto::result_of::child_c<Expr, 1>::type e1; \ | |
| typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; \ | |
| typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1; \ | |
| public: \ | |
| BOOST_PROTO_DECLTYPE_( \ | |
| proto::detail::LMAKE<r0>() OP proto::detail::RMAKE<r1>() \ | |
| , result_type \ | |
| ) \ | |
| result_type operator ()(Expr &expr, Context &ctx) const \ | |
| { \ | |
| return proto::eval( \ | |
| proto::child_c<0>(expr), ctx) OP proto::eval(proto::child_c<1>(expr) \ | |
| , ctx \ | |
| ); \ | |
| } \ | |
| }; \ | |
| /**/ | |
| BOOST_PROTO_UNARY_DEFAULT_EVAL(+, proto::tag::unary_plus, make) | |
| BOOST_PROTO_UNARY_DEFAULT_EVAL(-, proto::tag::negate, make) | |
| BOOST_PROTO_UNARY_DEFAULT_EVAL(*, proto::tag::dereference, make) | |
| BOOST_PROTO_UNARY_DEFAULT_EVAL(~, proto::tag::complement, make) | |
| BOOST_PROTO_UNARY_DEFAULT_EVAL(&, proto::tag::address_of, make) | |
| BOOST_PROTO_UNARY_DEFAULT_EVAL(!, proto::tag::logical_not, make) | |
| BOOST_PROTO_UNARY_DEFAULT_EVAL(++, proto::tag::pre_inc, make_mutable) | |
| BOOST_PROTO_UNARY_DEFAULT_EVAL(--, proto::tag::pre_dec, make_mutable) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(<<, proto::tag::shift_left, make_mutable, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(>>, proto::tag::shift_right, make_mutable, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(*, proto::tag::multiplies, make, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(/, proto::tag::divides, make, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(%, proto::tag::modulus, make, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(+, proto::tag::plus, make, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(-, proto::tag::minus, make, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(<, proto::tag::less, make, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(>, proto::tag::greater, make, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(<=, proto::tag::less_equal, make, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(>=, proto::tag::greater_equal, make, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(==, proto::tag::equal_to, make, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(!=, proto::tag::not_equal_to, make, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(||, proto::tag::logical_or, make, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(&&, proto::tag::logical_and, make, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(&, proto::tag::bitwise_and, make, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(|, proto::tag::bitwise_or, make, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(^, proto::tag::bitwise_xor, make, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(=, proto::tag::assign, make_mutable, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(<<=, proto::tag::shift_left_assign, make_mutable, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(>>=, proto::tag::shift_right_assign, make_mutable, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(*=, proto::tag::multiplies_assign, make_mutable, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(/=, proto::tag::divides_assign, make_mutable, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(%=, proto::tag::modulus_assign, make_mutable, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(+=, proto::tag::plus_assign, make_mutable, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(-=, proto::tag::minus_assign, make_mutable, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(&=, proto::tag::bitwise_and_assign, make_mutable, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(|=, proto::tag::bitwise_or_assign, make_mutable, make) | |
| BOOST_PROTO_BINARY_DEFAULT_EVAL(^=, proto::tag::bitwise_xor_assign, make_mutable, make) | |
| #undef BOOST_PROTO_UNARY_DEFAULT_EVAL | |
| #undef BOOST_PROTO_BINARY_DEFAULT_EVAL | |
| /// INTERNAL ONLY | |
| template<typename Expr, typename Context> | |
| struct is_member_function_eval | |
| : is_member_function_pointer< | |
| typename detail::uncvref< | |
| typename proto::result_of::eval< | |
| typename remove_reference< | |
| typename proto::result_of::child_c<Expr, 1>::type | |
| >::type | |
| , Context | |
| >::type | |
| >::type | |
| > | |
| {}; | |
| /// INTERNAL ONLY | |
| template<typename Expr, typename Context, bool IsMemFunCall> | |
| struct memfun_eval | |
| { | |
| private: | |
| typedef typename result_of::child_c<Expr, 0>::type e0; | |
| typedef typename result_of::child_c<Expr, 1>::type e1; | |
| typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; | |
| typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1; | |
| public: | |
| typedef typename detail::mem_ptr_fun<r0, r1>::result_type result_type; | |
| result_type operator ()(Expr &expr, Context &ctx) const | |
| { | |
| return detail::mem_ptr_fun<r0, r1>()( | |
| proto::eval(proto::child_c<0>(expr), ctx) | |
| , proto::eval(proto::child_c<1>(expr), ctx) | |
| ); | |
| } | |
| }; | |
| /// INTERNAL ONLY | |
| template<typename Expr, typename Context> | |
| struct memfun_eval<Expr, Context, true> | |
| { | |
| private: | |
| typedef typename result_of::child_c<Expr, 0>::type e0; | |
| typedef typename result_of::child_c<Expr, 1>::type e1; | |
| typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; | |
| typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1; | |
| public: | |
| typedef detail::memfun<r0, r1> result_type; | |
| result_type const operator ()(Expr &expr, Context &ctx) const | |
| { | |
| return detail::memfun<r0, r1>( | |
| proto::eval(proto::child_c<0>(expr), ctx) | |
| , proto::eval(proto::child_c<1>(expr), ctx) | |
| ); | |
| } | |
| }; | |
| template<typename Expr, typename Context> | |
| struct default_eval<Expr, Context, tag::mem_ptr, 2> | |
| : memfun_eval<Expr, Context, is_member_function_eval<Expr, Context>::value> | |
| {}; | |
| // Handle post-increment specially. | |
| template<typename Expr, typename Context> | |
| struct default_eval<Expr, Context, proto::tag::post_inc, 1> | |
| { | |
| private: | |
| typedef typename proto::result_of::child_c<Expr, 0>::type e0; | |
| typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; | |
| public: | |
| BOOST_PROTO_DECLTYPE_(proto::detail::make_mutable<r0>() ++, result_type) | |
| result_type operator ()(Expr &expr, Context &ctx) const | |
| { | |
| return proto::eval(proto::child_c<0>(expr), ctx) ++; | |
| } | |
| }; | |
| // Handle post-decrement specially. | |
| template<typename Expr, typename Context> | |
| struct default_eval<Expr, Context, proto::tag::post_dec, 1> | |
| { | |
| private: | |
| typedef typename proto::result_of::child_c<Expr, 0>::type e0; | |
| typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; | |
| public: | |
| BOOST_PROTO_DECLTYPE_(proto::detail::make_mutable<r0>() --, result_type) | |
| result_type operator ()(Expr &expr, Context &ctx) const | |
| { | |
| return proto::eval(proto::child_c<0>(expr), ctx) --; | |
| } | |
| }; | |
| // Handle subscript specially. | |
| template<typename Expr, typename Context> | |
| struct default_eval<Expr, Context, proto::tag::subscript, 2> | |
| { | |
| private: | |
| typedef typename proto::result_of::child_c<Expr, 0>::type e0; | |
| typedef typename proto::result_of::child_c<Expr, 1>::type e1; | |
| typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; | |
| typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1; | |
| public: | |
| BOOST_PROTO_DECLTYPE_(proto::detail::make_subscriptable<r0>()[proto::detail::make<r1>()], result_type) | |
| result_type operator ()(Expr &expr, Context &ctx) const | |
| { | |
| return proto::eval(proto::child_c<0>(expr), ctx)[proto::eval(proto::child_c<1>(expr), ctx)]; | |
| } | |
| }; | |
| // Handle if_else_ specially. | |
| template<typename Expr, typename Context> | |
| struct default_eval<Expr, Context, proto::tag::if_else_, 3> | |
| { | |
| private: | |
| typedef typename proto::result_of::child_c<Expr, 0>::type e0; | |
| typedef typename proto::result_of::child_c<Expr, 1>::type e1; | |
| typedef typename proto::result_of::child_c<Expr, 2>::type e2; | |
| typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; | |
| typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1; | |
| typedef typename proto::result_of::eval<UNREF(e2), Context>::type r2; | |
| public: | |
| BOOST_PROTO_DECLTYPE_( | |
| proto::detail::make<r0>() | |
| ? proto::detail::make<r1>() | |
| : proto::detail::make<r2>() | |
| , result_type | |
| ) | |
| result_type operator ()(Expr &expr, Context &ctx) const | |
| { | |
| return proto::eval(proto::child_c<0>(expr), ctx) | |
| ? proto::eval(proto::child_c<1>(expr), ctx) | |
| : proto::eval(proto::child_c<2>(expr), ctx); | |
| } | |
| }; | |
| // Handle comma specially. | |
| template<typename Expr, typename Context> | |
| struct default_eval<Expr, Context, proto::tag::comma, 2> | |
| { | |
| private: | |
| typedef typename proto::result_of::child_c<Expr, 0>::type e0; | |
| typedef typename proto::result_of::child_c<Expr, 1>::type e1; | |
| typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; | |
| typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1; | |
| public: | |
| typedef typename proto::detail::comma_result<r0, r1>::type result_type; | |
| result_type operator ()(Expr &expr, Context &ctx) const | |
| { | |
| return proto::eval(proto::child_c<0>(expr), ctx), proto::eval(proto::child_c<1>(expr), ctx); | |
| } | |
| }; | |
| // Handle function specially | |
| #define BOOST_PROTO_DEFAULT_EVAL_TYPE(Z, N, DATA) \ | |
| typename proto::result_of::eval< \ | |
| typename remove_reference< \ | |
| typename proto::result_of::child_c<DATA, N>::type \ | |
| >::type \ | |
| , Context \ | |
| >::type \ | |
| /**/ | |
| #define BOOST_PROTO_DEFAULT_EVAL(Z, N, DATA) \ | |
| proto::eval(proto::child_c<N>(DATA), context) \ | |
| /**/ | |
| template<typename Expr, typename Context> | |
| struct default_eval<Expr, Context, proto::tag::function, 1> | |
| { | |
| typedef | |
| typename proto::detail::result_of_fixup< | |
| BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr) | |
| >::type | |
| function_type; | |
| typedef | |
| typename BOOST_PROTO_RESULT_OF<function_type()>::type | |
| result_type; | |
| result_type operator ()(Expr &expr, Context &context) const | |
| { | |
| return BOOST_PROTO_DEFAULT_EVAL(~, 0, expr)(); | |
| } | |
| }; | |
| template<typename Expr, typename Context> | |
| struct default_eval<Expr, Context, proto::tag::function, 2> | |
| { | |
| typedef | |
| typename proto::detail::result_of_fixup< | |
| BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr) | |
| >::type | |
| function_type; | |
| typedef | |
| typename detail::result_of_< | |
| function_type(BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 1, Expr)) | |
| >::type | |
| result_type; | |
| result_type operator ()(Expr &expr, Context &context) const | |
| { | |
| return this->invoke( | |
| expr | |
| , context | |
| , is_member_function_pointer<function_type>() | |
| , is_member_object_pointer<function_type>() | |
| ); | |
| } | |
| private: | |
| result_type invoke(Expr &expr, Context &context, mpl::false_, mpl::false_) const | |
| { | |
| return BOOST_PROTO_DEFAULT_EVAL(~, 0, expr)(BOOST_PROTO_DEFAULT_EVAL(~, 1, expr)); | |
| } | |
| result_type invoke(Expr &expr, Context &context, mpl::true_, mpl::false_) const | |
| { | |
| BOOST_PROTO_USE_GET_POINTER(); | |
| typedef typename detail::classtypeof<function_type>::type class_type; | |
| return ( | |
| BOOST_PROTO_GET_POINTER(class_type, BOOST_PROTO_DEFAULT_EVAL(~, 1, expr)) ->* | |
| BOOST_PROTO_DEFAULT_EVAL(~, 0, expr) | |
| )(); | |
| } | |
| result_type invoke(Expr &expr, Context &context, mpl::false_, mpl::true_) const | |
| { | |
| BOOST_PROTO_USE_GET_POINTER(); | |
| typedef typename detail::classtypeof<function_type>::type class_type; | |
| return ( | |
| BOOST_PROTO_GET_POINTER(class_type, BOOST_PROTO_DEFAULT_EVAL(~, 1, expr)) ->* | |
| BOOST_PROTO_DEFAULT_EVAL(~, 0, expr) | |
| ); | |
| } | |
| }; | |
| #define BOOST_PP_ITERATION_PARAMS_1 (3, (3, BOOST_PROTO_MAX_ARITY, <boost/proto/context/default.hpp>)) | |
| #include BOOST_PP_ITERATE() | |
| #undef BOOST_PROTO_DEFAULT_EVAL_TYPE | |
| #undef BOOST_PROTO_DEFAULT_EVAL | |
| /// default_context | |
| /// | |
| struct default_context | |
| { | |
| /// default_context::eval | |
| /// | |
| template<typename Expr, typename ThisContext = default_context const> | |
| struct eval | |
| : default_eval<Expr, ThisContext> | |
| {}; | |
| }; | |
| } // namespace context | |
| }} // namespace boost::proto | |
| #undef UNREF | |
| #endif | |
| #else | |
| #define N BOOST_PP_ITERATION() | |
| template<typename Expr, typename Context> | |
| struct default_eval<Expr, Context, proto::tag::function, N> | |
| { | |
| typedef | |
| typename proto::detail::result_of_fixup< | |
| BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr) | |
| >::type | |
| function_type; | |
| typedef | |
| typename BOOST_PROTO_RESULT_OF< | |
| function_type(BOOST_PP_ENUM_SHIFTED(N, BOOST_PROTO_DEFAULT_EVAL_TYPE, Expr)) | |
| >::type | |
| result_type; | |
| result_type operator ()(Expr &expr, Context &context) const | |
| { | |
| return this->invoke(expr, context, is_member_function_pointer<function_type>()); | |
| } | |
| private: | |
| result_type invoke(Expr &expr, Context &context, mpl::false_) const | |
| { | |
| return BOOST_PROTO_DEFAULT_EVAL(~, 0, expr)( | |
| BOOST_PP_ENUM_SHIFTED(N, BOOST_PROTO_DEFAULT_EVAL, expr) | |
| ); | |
| } | |
| result_type invoke(Expr &expr, Context &context, mpl::true_) const | |
| { | |
| #define M0(Z, M, DATA) \ | |
| BOOST_PROTO_DEFAULT_EVAL(Z, BOOST_PP_ADD(M, 2), DATA) \ | |
| /**/ | |
| BOOST_PROTO_USE_GET_POINTER(); | |
| typedef typename detail::classtypeof<function_type>::type class_type; | |
| return ( | |
| BOOST_PROTO_GET_POINTER(class_type, BOOST_PROTO_DEFAULT_EVAL(~, 1, expr)) ->* | |
| BOOST_PROTO_DEFAULT_EVAL(~, 0, expr) | |
| )(BOOST_PP_ENUM(BOOST_PP_SUB(N, 2), M0, expr)); | |
| #undef M0 | |
| } | |
| }; | |
| #undef N | |
| #endif |