| /////////////////////////////////////////////////////////////////////////////// |
| // expr.hpp |
| // Contains definition of expr\<\> class template. |
| // |
| // 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_PP_IS_ITERATING |
| #error Do not include this file directly |
| #endif |
| |
| #define ARG_COUNT BOOST_PP_MAX(1, BOOST_PP_ITERATION()) |
| |
| /// \brief Simplified representation of a node in an expression tree. |
| /// |
| /// \c proto::basic_expr\<\> is a node in an expression template tree. It |
| /// is a container for its child sub-trees. It also serves as |
| /// the terminal nodes of the tree. |
| /// |
| /// \c Tag is type that represents the operation encoded by |
| /// this expression. It is typically one of the structs |
| /// in the \c boost::proto::tag namespace, but it doesn't |
| /// have to be. |
| /// |
| /// \c Args is a type list representing the type of the children |
| /// of this expression. It is an instantiation of one |
| /// of \c proto::list1\<\>, \c proto::list2\<\>, etc. The |
| /// child types must all themselves be either \c expr\<\> |
| /// or <tt>proto::expr\<\>&</tt>. If \c Args is an |
| /// instantiation of \c proto::term\<\> then this |
| /// \c expr\<\> type represents a terminal expression; |
| /// the parameter to the \c proto::term\<\> template |
| /// represents the terminal's value type. |
| /// |
| /// \c Arity is an integral constant representing the number of child |
| /// nodes this node contains. If \c Arity is 0, then this |
| /// node is a terminal. |
| /// |
| /// \c proto::basic_expr\<\> is a valid Fusion random-access sequence, where |
| /// the elements of the sequence are the child expressions. |
| #ifdef BOOST_PROTO_DEFINE_TERMINAL |
| template<typename Tag, typename Arg0> |
| struct basic_expr<Tag, term<Arg0>, 0> |
| #else |
| template<typename Tag BOOST_PP_ENUM_TRAILING_PARAMS(ARG_COUNT, typename Arg)> |
| struct basic_expr<Tag, BOOST_PP_CAT(list, BOOST_PP_ITERATION())<BOOST_PP_ENUM_PARAMS(ARG_COUNT, Arg)>, BOOST_PP_ITERATION() > |
| #endif |
| { |
| typedef Tag proto_tag; |
| BOOST_STATIC_CONSTANT(long, proto_arity_c = BOOST_PP_ITERATION()); |
| typedef mpl::long_<BOOST_PP_ITERATION() > proto_arity; |
| typedef basic_expr proto_base_expr; |
| #ifdef BOOST_PROTO_DEFINE_TERMINAL |
| typedef term<Arg0> proto_args; |
| #else |
| typedef BOOST_PP_CAT(list, BOOST_PP_ITERATION())<BOOST_PP_ENUM_PARAMS(ARG_COUNT, Arg)> proto_args; |
| #endif |
| typedef basic_expr proto_grammar; |
| typedef default_domain proto_domain; |
| typedef default_generator proto_generator; |
| typedef proto::tag::proto_expr fusion_tag; |
| typedef basic_expr proto_derived_expr; |
| typedef void proto_is_expr_; /**< INTERNAL ONLY */ |
| |
| BOOST_PP_REPEAT(ARG_COUNT, BOOST_PROTO_CHILD, ~) |
| BOOST_PP_REPEAT_FROM_TO(ARG_COUNT, BOOST_PROTO_MAX_ARITY, BOOST_PROTO_VOID, ~) |
| |
| /// \return *this |
| /// |
| basic_expr const &proto_base() const |
| { |
| return *this; |
| } |
| |
| /// \overload |
| /// |
| basic_expr &proto_base() |
| { |
| return *this; |
| } |
| |
| #ifdef BOOST_PROTO_DEFINE_TERMINAL |
| /// \return A new \c expr\<\> object initialized with the specified |
| /// arguments. |
| /// |
| template<typename A0> |
| static basic_expr const make(A0 &a0) |
| { |
| return detail::make_terminal(a0, static_cast<basic_expr *>(0), static_cast<proto_args *>(0)); |
| } |
| |
| /// \overload |
| /// |
| template<typename A0> |
| static basic_expr const make(A0 const &a0) |
| { |
| return detail::make_terminal(a0, static_cast<basic_expr *>(0), static_cast<proto_args *>(0)); |
| } |
| #else |
| /// \return A new \c expr\<\> object initialized with the specified |
| /// arguments. |
| /// |
| template<BOOST_PP_ENUM_PARAMS(ARG_COUNT, typename A)> |
| static basic_expr const make(BOOST_PP_ENUM_BINARY_PARAMS(ARG_COUNT, A, const &a)) |
| { |
| basic_expr that = {BOOST_PP_ENUM_PARAMS(ARG_COUNT, a)}; |
| return that; |
| } |
| #endif |
| |
| #if 1 == BOOST_PP_ITERATION() |
| /// If \c Tag is \c boost::proto::tag::address_of and \c proto_child0 is |
| /// <tt>T&</tt>, then \c address_of_hack_type_ is <tt>T*</tt>. |
| /// Otherwise, it is some undefined type. |
| typedef typename detail::address_of_hack<Tag, proto_child0>::type address_of_hack_type_; |
| |
| /// \return The address of <tt>this->child0</tt> if \c Tag is |
| /// \c boost::proto::tag::address_of. Otherwise, this function will |
| /// fail to compile. |
| /// |
| /// \attention Proto overloads <tt>operator&</tt>, which means that |
| /// proto-ified objects cannot have their addresses taken, unless we use |
| /// the following hack to make \c &x implicitly convertible to \c X*. |
| operator address_of_hack_type_() const |
| { |
| return boost::addressof(this->child0); |
| } |
| #else |
| /// INTERNAL ONLY |
| /// |
| typedef detail::not_a_valid_type address_of_hack_type_; |
| #endif |
| }; |
| |
| /// \brief Representation of a node in an expression tree. |
| /// |
| /// \c proto::expr\<\> is a node in an expression template tree. It |
| /// is a container for its child sub-trees. It also serves as |
| /// the terminal nodes of the tree. |
| /// |
| /// \c Tag is type that represents the operation encoded by |
| /// this expression. It is typically one of the structs |
| /// in the \c boost::proto::tag namespace, but it doesn't |
| /// have to be. |
| /// |
| /// \c Args is a type list representing the type of the children |
| /// of this expression. It is an instantiation of one |
| /// of \c proto::list1\<\>, \c proto::list2\<\>, etc. The |
| /// child types must all themselves be either \c expr\<\> |
| /// or <tt>proto::expr\<\>&</tt>. If \c Args is an |
| /// instantiation of \c proto::term\<\> then this |
| /// \c expr\<\> type represents a terminal expression; |
| /// the parameter to the \c proto::term\<\> template |
| /// represents the terminal's value type. |
| /// |
| /// \c Arity is an integral constant representing the number of child |
| /// nodes this node contains. If \c Arity is 0, then this |
| /// node is a terminal. |
| /// |
| /// \c proto::expr\<\> is a valid Fusion random-access sequence, where |
| /// the elements of the sequence are the child expressions. |
| #ifdef BOOST_PROTO_DEFINE_TERMINAL |
| template<typename Tag, typename Arg0> |
| struct expr<Tag, term<Arg0>, 0> |
| #else |
| template<typename Tag BOOST_PP_ENUM_TRAILING_PARAMS(ARG_COUNT, typename Arg)> |
| struct expr<Tag, BOOST_PP_CAT(list, BOOST_PP_ITERATION())<BOOST_PP_ENUM_PARAMS(ARG_COUNT, Arg)>, BOOST_PP_ITERATION() > |
| #endif |
| { |
| typedef Tag proto_tag; |
| BOOST_STATIC_CONSTANT(long, proto_arity_c = BOOST_PP_ITERATION()); |
| typedef mpl::long_<BOOST_PP_ITERATION() > proto_arity; |
| typedef expr proto_base_expr; |
| #ifdef BOOST_PROTO_DEFINE_TERMINAL |
| typedef term<Arg0> proto_args; |
| #else |
| typedef BOOST_PP_CAT(list, BOOST_PP_ITERATION())<BOOST_PP_ENUM_PARAMS(ARG_COUNT, Arg)> proto_args; |
| #endif |
| typedef basic_expr<Tag, proto_args, BOOST_PP_ITERATION() > proto_grammar; |
| typedef default_domain proto_domain; |
| typedef default_generator proto_generator; |
| typedef proto::tag::proto_expr fusion_tag; |
| typedef expr proto_derived_expr; |
| typedef void proto_is_expr_; /**< INTERNAL ONLY */ |
| |
| BOOST_PP_REPEAT(ARG_COUNT, BOOST_PROTO_CHILD, ~) |
| BOOST_PP_REPEAT_FROM_TO(ARG_COUNT, BOOST_PROTO_MAX_ARITY, BOOST_PROTO_VOID, ~) |
| |
| /// \return *this |
| /// |
| expr const &proto_base() const |
| { |
| return *this; |
| } |
| |
| /// \overload |
| /// |
| expr &proto_base() |
| { |
| return *this; |
| } |
| |
| #ifdef BOOST_PROTO_DEFINE_TERMINAL |
| /// \return A new \c expr\<\> object initialized with the specified |
| /// arguments. |
| /// |
| template<typename A0> |
| static expr const make(A0 &a0) |
| { |
| return detail::make_terminal(a0, static_cast<expr *>(0), static_cast<proto_args *>(0)); |
| } |
| |
| /// \overload |
| /// |
| template<typename A0> |
| static expr const make(A0 const &a0) |
| { |
| return detail::make_terminal(a0, static_cast<expr *>(0), static_cast<proto_args *>(0)); |
| } |
| #else |
| /// \return A new \c expr\<\> object initialized with the specified |
| /// arguments. |
| /// |
| template<BOOST_PP_ENUM_PARAMS(ARG_COUNT, typename A)> |
| static expr const make(BOOST_PP_ENUM_BINARY_PARAMS(ARG_COUNT, A, const &a)) |
| { |
| expr that = {BOOST_PP_ENUM_PARAMS(ARG_COUNT, a)}; |
| return that; |
| } |
| #endif |
| |
| #if 1 == BOOST_PP_ITERATION() |
| /// If \c Tag is \c boost::proto::tag::address_of and \c proto_child0 is |
| /// <tt>T&</tt>, then \c address_of_hack_type_ is <tt>T*</tt>. |
| /// Otherwise, it is some undefined type. |
| typedef typename detail::address_of_hack<Tag, proto_child0>::type address_of_hack_type_; |
| |
| /// \return The address of <tt>this->child0</tt> if \c Tag is |
| /// \c boost::proto::tag::address_of. Otherwise, this function will |
| /// fail to compile. |
| /// |
| /// \attention Proto overloads <tt>operator&</tt>, which means that |
| /// proto-ified objects cannot have their addresses taken, unless we use |
| /// the following hack to make \c &x implicitly convertible to \c X*. |
| operator address_of_hack_type_() const |
| { |
| return boost::addressof(this->child0); |
| } |
| #else |
| /// INTERNAL ONLY |
| /// |
| typedef detail::not_a_valid_type address_of_hack_type_; |
| #endif |
| |
| /// Assignment |
| /// |
| /// \param a The rhs. |
| /// \return A new \c expr\<\> node representing an assignment of \c that to \c *this. |
| proto::expr< |
| proto::tag::assign |
| , list2<expr &, expr const &> |
| , 2 |
| > const |
| operator =(expr const &a) |
| { |
| proto::expr< |
| proto::tag::assign |
| , list2<expr &, expr const &> |
| , 2 |
| > that = {*this, a}; |
| return that; |
| } |
| |
| /// Assignment |
| /// |
| /// \param a The rhs. |
| /// \return A new \c expr\<\> node representing an assignment of \c a to \c *this. |
| template<typename A> |
| proto::expr< |
| proto::tag::assign |
| , list2<expr const &, typename result_of::as_child<A>::type> |
| , 2 |
| > const |
| operator =(A &a) const |
| { |
| proto::expr< |
| proto::tag::assign |
| , list2<expr const &, typename result_of::as_child<A>::type> |
| , 2 |
| > that = {*this, proto::as_child(a)}; |
| return that; |
| } |
| |
| /// \overload |
| /// |
| template<typename A> |
| proto::expr< |
| proto::tag::assign |
| , list2<expr const &, typename result_of::as_child<A const>::type> |
| , 2 |
| > const |
| operator =(A const &a) const |
| { |
| proto::expr< |
| proto::tag::assign |
| , list2<expr const &, typename result_of::as_child<A const>::type> |
| , 2 |
| > that = {*this, proto::as_child(a)}; |
| return that; |
| } |
| |
| #ifdef BOOST_PROTO_DEFINE_TERMINAL |
| /// \overload |
| /// |
| template<typename A> |
| proto::expr< |
| proto::tag::assign |
| , list2<expr &, typename result_of::as_child<A>::type> |
| , 2 |
| > const |
| operator =(A &a) |
| { |
| proto::expr< |
| proto::tag::assign |
| , list2<expr &, typename result_of::as_child<A>::type> |
| , 2 |
| > that = {*this, proto::as_child(a)}; |
| return that; |
| } |
| |
| /// \overload |
| /// |
| template<typename A> |
| proto::expr< |
| proto::tag::assign |
| , list2<expr &, typename result_of::as_child<A const>::type> |
| , 2 |
| > const |
| operator =(A const &a) |
| { |
| proto::expr< |
| proto::tag::assign |
| , list2<expr &, typename result_of::as_child<A const>::type> |
| , 2 |
| > that = {*this, proto::as_child(a)}; |
| return that; |
| } |
| #endif |
| |
| /// Subscript |
| /// |
| /// \param a The rhs. |
| /// \return A new \c expr\<\> node representing \c *this subscripted with \c a. |
| template<typename A> |
| proto::expr< |
| proto::tag::subscript |
| , list2<expr const &, typename result_of::as_child<A>::type> |
| , 2 |
| > const |
| operator [](A &a) const |
| { |
| proto::expr< |
| proto::tag::subscript |
| , list2<expr const &, typename result_of::as_child<A>::type> |
| , 2 |
| > that = {*this, proto::as_child(a)}; |
| return that; |
| } |
| |
| /// \overload |
| /// |
| template<typename A> |
| proto::expr< |
| proto::tag::subscript |
| , list2<expr const &, typename result_of::as_child<A const>::type> |
| , 2 |
| > const |
| operator [](A const &a) const |
| { |
| proto::expr< |
| proto::tag::subscript |
| , list2<expr const &, typename result_of::as_child<A const>::type> |
| , 2 |
| > that = {*this, proto::as_child(a)}; |
| return that; |
| } |
| |
| #ifdef BOOST_PROTO_DEFINE_TERMINAL |
| /// \overload |
| /// |
| template<typename A> |
| proto::expr< |
| proto::tag::subscript |
| , list2<expr &, typename result_of::as_child<A>::type> |
| , 2 |
| > const |
| operator [](A &a) |
| { |
| proto::expr< |
| proto::tag::subscript |
| , list2<expr &, typename result_of::as_child<A>::type> |
| , 2 |
| > that = {*this, proto::as_child(a)}; |
| return that; |
| } |
| |
| /// \overload |
| /// |
| template<typename A> |
| proto::expr< |
| proto::tag::subscript |
| , list2<expr &, typename result_of::as_child<A const>::type> |
| , 2 |
| > const |
| operator [](A const &a) |
| { |
| proto::expr< |
| proto::tag::subscript |
| , list2<expr &, typename result_of::as_child<A const>::type> |
| , 2 |
| > that = {*this, proto::as_child(a)}; |
| return that; |
| } |
| #endif |
| |
| /// Encodes the return type of \c expr\<\>::operator(), for use with \c boost::result_of\<\> |
| /// |
| template<typename Sig> |
| struct result |
| { |
| typedef typename result_of::funop<Sig, expr, default_domain>::type const type; |
| }; |
| |
| /// Function call |
| /// |
| /// \return A new \c expr\<\> node representing the function invocation of \c (*this)(). |
| proto::expr<proto::tag::function, list1<expr const &>, 1> const |
| operator ()() const |
| { |
| proto::expr<proto::tag::function, list1<expr const &>, 1> that = {*this}; |
| return that; |
| } |
| |
| #ifdef BOOST_PROTO_DEFINE_TERMINAL |
| /// \overload |
| /// |
| proto::expr<proto::tag::function, list1<expr &>, 1> const |
| operator ()() |
| { |
| proto::expr<proto::tag::function, list1<expr &>, 1> that = {*this}; |
| return that; |
| } |
| #endif |
| |
| #define BOOST_PP_ITERATION_PARAMS_2 (3, (1, BOOST_PP_DEC(BOOST_PROTO_MAX_FUNCTION_CALL_ARITY), <boost/proto/detail/expr1.hpp>)) |
| #include BOOST_PP_ITERATE() |
| }; |
| |
| #undef ARG_COUNT |