]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
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 | |
113 | basic_expr const &proto_base() const | |
114 | { | |
115 | return *this; | |
116 | } | |
117 | ||
118 | /// \overload | |
119 | /// | |
120 | BOOST_FORCEINLINE | |
121 | 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 | |
132 | 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 | |
141 | 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 | |
151 | 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 | |
172 | 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 |