| #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/proto/detail/prefix.hpp> // must be first include |
| #include <boost/config.hpp> |
| #include <boost/preprocessor/iteration/iterate.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> |
| #include <boost/proto/detail/suffix.hpp> // must be last include |
| |
| namespace boost { namespace proto |
| { |
| /// INTERNAL ONLY |
| /// |
| #define UNREF(x) typename boost::remove_reference<x>::type |
| |
| namespace context |
| { |
| template< |
| typename Expr |
| , typename Context |
| , typename Tag BOOST_PROTO_WHEN_BUILDING_DOCS(= typename Expr::proto_tag) |
| , long Arity BOOST_PROTO_WHEN_BUILDING_DOCS(= Expr::proto_arity_c) |
| > |
| struct default_eval |
| {}; |
| |
| /// INTERNAL ONLY |
| /// |
| #define BOOST_PROTO_UNARY_OP_RESULT(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_OP_RESULT(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_OP_RESULT(+, proto::tag::unary_plus, make) |
| BOOST_PROTO_UNARY_OP_RESULT(-, proto::tag::negate, make) |
| BOOST_PROTO_UNARY_OP_RESULT(*, proto::tag::dereference, make) |
| BOOST_PROTO_UNARY_OP_RESULT(~, proto::tag::complement, make) |
| BOOST_PROTO_UNARY_OP_RESULT(&, proto::tag::address_of, make) |
| BOOST_PROTO_UNARY_OP_RESULT(!, proto::tag::logical_not, make) |
| BOOST_PROTO_UNARY_OP_RESULT(++, proto::tag::pre_inc, make_mutable) |
| BOOST_PROTO_UNARY_OP_RESULT(--, proto::tag::pre_dec, make_mutable) |
| |
| BOOST_PROTO_BINARY_OP_RESULT(<<, proto::tag::shift_left, make_mutable, make) |
| BOOST_PROTO_BINARY_OP_RESULT(>>, proto::tag::shift_right, make_mutable, make) |
| BOOST_PROTO_BINARY_OP_RESULT(*, proto::tag::multiplies, make, make) |
| BOOST_PROTO_BINARY_OP_RESULT(/, proto::tag::divides, make, make) |
| BOOST_PROTO_BINARY_OP_RESULT(%, proto::tag::modulus, make, make) |
| BOOST_PROTO_BINARY_OP_RESULT(+, proto::tag::plus, make, make) |
| BOOST_PROTO_BINARY_OP_RESULT(-, proto::tag::minus, make, make) |
| BOOST_PROTO_BINARY_OP_RESULT(<, proto::tag::less, make, make) |
| BOOST_PROTO_BINARY_OP_RESULT(>, proto::tag::greater, make, make) |
| BOOST_PROTO_BINARY_OP_RESULT(<=, proto::tag::less_equal, make, make) |
| BOOST_PROTO_BINARY_OP_RESULT(>=, proto::tag::greater_equal, make, make) |
| BOOST_PROTO_BINARY_OP_RESULT(==, proto::tag::equal_to, make, make) |
| BOOST_PROTO_BINARY_OP_RESULT(!=, proto::tag::not_equal_to, make, make) |
| BOOST_PROTO_BINARY_OP_RESULT(||, proto::tag::logical_or, make, make) |
| BOOST_PROTO_BINARY_OP_RESULT(&&, proto::tag::logical_and, make, make) |
| BOOST_PROTO_BINARY_OP_RESULT(&, proto::tag::bitwise_and, make, make) |
| BOOST_PROTO_BINARY_OP_RESULT(|, proto::tag::bitwise_or, make, make) |
| BOOST_PROTO_BINARY_OP_RESULT(^, proto::tag::bitwise_xor, make, make) |
| |
| BOOST_PROTO_BINARY_OP_RESULT(=, proto::tag::assign, make_mutable, make) |
| BOOST_PROTO_BINARY_OP_RESULT(<<=, proto::tag::shift_left_assign, make_mutable, make) |
| BOOST_PROTO_BINARY_OP_RESULT(>>=, proto::tag::shift_right_assign, make_mutable, make) |
| BOOST_PROTO_BINARY_OP_RESULT(*=, proto::tag::multiplies_assign, make_mutable, make) |
| BOOST_PROTO_BINARY_OP_RESULT(/=, proto::tag::divides_assign, make_mutable, make) |
| BOOST_PROTO_BINARY_OP_RESULT(%=, proto::tag::modulus_assign, make_mutable, make) |
| BOOST_PROTO_BINARY_OP_RESULT(+=, proto::tag::plus_assign, make_mutable, make) |
| BOOST_PROTO_BINARY_OP_RESULT(-=, proto::tag::minus_assign, make_mutable, make) |
| BOOST_PROTO_BINARY_OP_RESULT(&=, proto::tag::bitwise_and_assign, make_mutable, make) |
| BOOST_PROTO_BINARY_OP_RESULT(|=, proto::tag::bitwise_or_assign, make_mutable, make) |
| BOOST_PROTO_BINARY_OP_RESULT(^=, proto::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 Context> |
| struct is_member_function_eval |
| : is_member_function_pointer< |
| typename remove_const< |
| typename remove_reference< |
| typename proto::result_of::eval< |
| typename remove_reference< |
| typename proto::result_of::child_c<Expr, 1>::type |
| >::type |
| , Context |
| >::type |
| >::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> |
| {}; |
| |
| template<typename Expr, typename Context, typename Tag> |
| struct default_eval<Expr, Context, Tag, 0> |
| { |
| typedef |
| typename proto::result_of::value<Expr &>::type |
| result_type; |
| |
| result_type operator ()(Expr &expr, Context &) const |
| { |
| return proto::value(expr); |
| } |
| }; |
| |
| // 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 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 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<EVAL_TYPE(~, 0, Expr)>::type |
| function_type; |
| |
| typedef |
| typename boost::result_of<function_type()>::type |
| result_type; |
| |
| result_type operator ()(Expr &expr, Context &context) const |
| { |
| return EVAL(~, 0, expr)(); |
| } |
| }; |
| |
| template<typename Expr, typename Context> |
| struct default_eval<Expr, Context, proto::tag::function, 2> |
| { |
| typedef |
| typename proto::detail::result_of_fixup<EVAL_TYPE(~, 0, Expr)>::type |
| function_type; |
| |
| typedef |
| typename detail::result_of_<function_type(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 EVAL(~, 0, expr)(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, EVAL(~, 1, expr)) ->* 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, EVAL(~, 1, expr)) ->* 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 EVAL_TYPE |
| #undef 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<EVAL_TYPE(~, 0, Expr)>::type |
| function_type; |
| |
| typedef |
| typename boost::result_of< |
| function_type(BOOST_PP_ENUM_SHIFTED(N, 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 EVAL(~, 0, expr)(BOOST_PP_ENUM_SHIFTED(N, EVAL, expr)); |
| } |
| |
| result_type invoke(Expr &expr, Context &context, mpl::true_) const |
| { |
| #define M0(Z, M, expr) BOOST_PP_COMMA_IF(BOOST_PP_SUB(M, 2)) EVAL(Z, M, expr) |
| BOOST_PROTO_USE_GET_POINTER(); |
| typedef typename detail::classtypeof<function_type>::type class_type; |
| return (BOOST_PROTO_GET_POINTER(class_type, EVAL(~, 1, expr)) ->* EVAL(~, 0, expr))( |
| BOOST_PP_REPEAT_FROM_TO(2, N, M0, expr) |
| ); |
| #undef M0 |
| } |
| }; |
| |
| #undef N |
| |
| #endif |
