1 #if !defined(BOOST_PROTO_DONT_USE_PREPROCESSED_FILES) 2 3 #include <boost/proto/detail/preprocessed/basic_expr.hpp> 4 5 #elif !defined(BOOST_PP_IS_ITERATING) 6 7 /// INTERNAL ONLY 8 /// 9 #define BOOST_PROTO_CHILD(Z, N, DATA) \ 10 typedef BOOST_PP_CAT(Arg, N) BOOST_PP_CAT(proto_child, N); \ 11 BOOST_PP_CAT(proto_child, N) BOOST_PP_CAT(child, N); \ 12 /**< INTERNAL ONLY */ 13 14 /// INTERNAL ONLY 15 /// 16 #define BOOST_PROTO_VOID(Z, N, DATA) \ 17 typedef void BOOST_PP_CAT(proto_child, N); \ 18 /**< INTERNAL ONLY */ 19 20 #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES) 21 #pragma wave option(preserve: 2, line: 0, output: "preprocessed/basic_expr.hpp") 22 #endif 23 24 /////////////////////////////////////////////////////////////////////////////// 25 /// \file basic_expr.hpp 26 /// Contains definition of basic_expr\<\> class template. 27 // 28 // Copyright 2008 Eric Niebler. Distributed under the Boost 29 // Software License, Version 1.0. (See accompanying file 30 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 31 32 #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES) 33 #pragma wave option(preserve: 1) 34 #endif 35 36 // The expr<> specializations are actually defined here. 37 #define BOOST_PROTO_DEFINE_TERMINAL 38 #define BOOST_PP_ITERATION_PARAMS_1 (3, (0, 0, <boost/proto/detail/basic_expr.hpp>)) 39 #include BOOST_PP_ITERATE() 40 41 #undef BOOST_PROTO_DEFINE_TERMINAL 42 #define BOOST_PP_ITERATION_PARAMS_1 (3, (1, BOOST_PROTO_MAX_ARITY, <boost/proto/detail/basic_expr.hpp>)) 43 #include BOOST_PP_ITERATE() 44 45 #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES) 46 #pragma wave option(output: null) 47 #endif 48 49 #undef BOOST_PROTO_CHILD 50 #undef BOOST_PROTO_VOID 51 52 #else 53 54 #define ARG_COUNT BOOST_PP_MAX(1, BOOST_PP_ITERATION()) 55 56 /// \brief Simplified representation of a node in an expression tree. 57 /// 58 /// \c proto::basic_expr\<\> is a node in an expression template tree. It 59 /// is a container for its child sub-trees. It also serves as 60 /// the terminal nodes of the tree. 61 /// 62 /// \c Tag is type that represents the operation encoded by 63 /// this expression. It is typically one of the structs 64 /// in the \c boost::proto::tag namespace, but it doesn't 65 /// have to be. 66 /// 67 /// \c Args is a type list representing the type of the children 68 /// of this expression. It is an instantiation of one 69 /// of \c proto::list1\<\>, \c proto::list2\<\>, etc. The 70 /// child types must all themselves be either \c expr\<\> 71 /// or <tt>proto::expr\<\>&</tt>. If \c Args is an 72 /// instantiation of \c proto::term\<\> then this 73 /// \c expr\<\> type represents a terminal expression; 74 /// the parameter to the \c proto::term\<\> template 75 /// represents the terminal's value type. 76 /// 77 /// \c Arity is an integral constant representing the number of child 78 /// nodes this node contains. If \c Arity is 0, then this 79 /// node is a terminal. 80 /// 81 /// \c proto::basic_expr\<\> is a valid Fusion random-access sequence, where 82 /// the elements of the sequence are the child expressions. 83 #ifdef BOOST_PROTO_DEFINE_TERMINAL 84 template<typename Tag, typename Arg0> 85 struct basic_expr<Tag, term<Arg0>, 0> 86 #else 87 template<typename Tag BOOST_PP_ENUM_TRAILING_PARAMS(ARG_COUNT, typename Arg)> 88 struct basic_expr<Tag, BOOST_PP_CAT(list, BOOST_PP_ITERATION())<BOOST_PP_ENUM_PARAMS(ARG_COUNT, Arg)>, BOOST_PP_ITERATION() > 89 #endif 90 { 91 typedef Tag proto_tag; 92 static const long proto_arity_c = BOOST_PP_ITERATION(); 93 typedef mpl::long_<BOOST_PP_ITERATION() > proto_arity; 94 typedef basic_expr proto_base_expr; 95 #ifdef BOOST_PROTO_DEFINE_TERMINAL 96 typedef term<Arg0> proto_args; 97 #else 98 typedef BOOST_PP_CAT(list, BOOST_PP_ITERATION())<BOOST_PP_ENUM_PARAMS(ARG_COUNT, Arg)> proto_args; 99 #endif 100 typedef basic_expr proto_grammar; 101 typedef basic_default_domain proto_domain; 102 typedef default_generator proto_generator; 103 typedef proto::tag::proto_expr<Tag, proto_domain> fusion_tag; 104 typedef basic_expr proto_derived_expr; 105 typedef void proto_is_expr_; /**< INTERNAL ONLY */ 106 107 BOOST_PP_REPEAT(ARG_COUNT, BOOST_PROTO_CHILD, ~) 108 BOOST_PP_REPEAT_FROM_TO(ARG_COUNT, BOOST_PROTO_MAX_ARITY, BOOST_PROTO_VOID, ~) 109 110 /// \return *this 111 /// 112 BOOST_FORCEINLINE proto_basebasic_expr113 basic_expr const &proto_base() const 114 { 115 return *this; 116 } 117 118 /// \overload 119 /// 120 BOOST_FORCEINLINE proto_basebasic_expr121 basic_expr &proto_base() 122 { 123 return *this; 124 } 125 126 #ifdef BOOST_PROTO_DEFINE_TERMINAL 127 /// \return A new \c expr\<\> object initialized with the specified 128 /// arguments. 129 /// 130 template<typename A0> 131 BOOST_FORCEINLINE makebasic_expr132 static basic_expr const make(A0 &a0) 133 { 134 return detail::make_terminal(a0, static_cast<basic_expr *>(0), static_cast<proto_args *>(0)); 135 } 136 137 /// \overload 138 /// 139 template<typename A0> 140 BOOST_FORCEINLINE makebasic_expr141 static basic_expr const make(A0 const &a0) 142 { 143 return detail::make_terminal(a0, static_cast<basic_expr *>(0), static_cast<proto_args *>(0)); 144 } 145 #else 146 /// \return A new \c expr\<\> object initialized with the specified 147 /// arguments. 148 /// 149 template<BOOST_PP_ENUM_PARAMS(ARG_COUNT, typename A)> 150 BOOST_FORCEINLINE makebasic_expr151 static basic_expr const make(BOOST_PP_ENUM_BINARY_PARAMS(ARG_COUNT, A, const &a)) 152 { 153 basic_expr that = {BOOST_PP_ENUM_PARAMS(ARG_COUNT, a)}; 154 return that; 155 } 156 #endif 157 158 #if 1 == BOOST_PP_ITERATION() 159 /// If \c Tag is \c boost::proto::tag::address_of and \c proto_child0 is 160 /// <tt>T&</tt>, then \c address_of_hack_type_ is <tt>T*</tt>. 161 /// Otherwise, it is some undefined type. 162 typedef typename detail::address_of_hack<Tag, proto_child0>::type address_of_hack_type_; 163 164 /// \return The address of <tt>this->child0</tt> if \c Tag is 165 /// \c boost::proto::tag::address_of. Otherwise, this function will 166 /// fail to compile. 167 /// 168 /// \attention Proto overloads <tt>operator&</tt>, which means that 169 /// proto-ified objects cannot have their addresses taken, unless we use 170 /// the following hack to make \c &x implicitly convertible to \c X*. 171 BOOST_FORCEINLINE operator address_of_hack_type_basic_expr172 operator address_of_hack_type_() const 173 { 174 return boost::addressof(this->child0); 175 } 176 #else 177 /// INTERNAL ONLY 178 /// 179 typedef detail::not_a_valid_type address_of_hack_type_; 180 #endif 181 }; 182 183 #undef ARG_COUNT 184 185 #endif 186