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1 | /*============================================================================= |
2 | Copyright (c) 2001-2014 Joel de Guzman | |
3 | ||
4 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
6 | ==============================================================================*/ | |
7 | #if !defined(BOOST_SPIRIT_X3_VARIANT_AUGUST_6_2011_0859AM) | |
8 | #define BOOST_SPIRIT_X3_VARIANT_AUGUST_6_2011_0859AM | |
9 | ||
10 | #include <boost/variant.hpp> | |
11 | #include <boost/mpl/list.hpp> | |
12 | #include <boost/type_traits/is_base_of.hpp> | |
13 | #include <type_traits> | |
14 | ||
15 | /////////////////////////////////////////////////////////////////////////////// | |
16 | namespace boost { namespace spirit { namespace x3 | |
17 | { | |
18 | template <typename T> | |
19 | class forward_ast | |
20 | { | |
21 | public: | |
22 | ||
23 | typedef T type; | |
24 | ||
25 | public: | |
26 | ||
27 | forward_ast() : p_(new T) {} | |
28 | ||
29 | forward_ast(forward_ast const& operand) | |
30 | : p_(new T(operand.get())) {} | |
31 | ||
32 | forward_ast(forward_ast&& operand) | |
33 | : p_(operand.p_) | |
34 | { | |
35 | operand.p_ = 0; | |
36 | } | |
37 | ||
38 | forward_ast(T const& operand) | |
39 | : p_(new T(operand)) {} | |
40 | ||
41 | forward_ast(T&& operand) | |
42 | : p_(new T(std::move(operand))) {} | |
43 | ||
44 | ~forward_ast() | |
45 | { | |
46 | boost::checked_delete(p_); | |
47 | } | |
48 | ||
49 | forward_ast& operator=(forward_ast const& rhs) | |
50 | { | |
51 | assign(rhs.get()); | |
52 | return *this; | |
53 | } | |
54 | ||
55 | void swap(forward_ast& operand) BOOST_NOEXCEPT | |
56 | { | |
57 | T* temp = operand.p_; | |
58 | operand.p_ = p_; | |
59 | p_ = temp; | |
60 | } | |
61 | ||
62 | forward_ast& operator=(T const& rhs) | |
63 | { | |
64 | assign(rhs); | |
65 | return *this; | |
66 | } | |
67 | ||
68 | forward_ast& operator=(forward_ast&& rhs) BOOST_NOEXCEPT | |
69 | { | |
70 | swap(rhs); | |
71 | return *this; | |
72 | } | |
73 | ||
74 | forward_ast& operator=(T&& rhs) | |
75 | { | |
76 | get() = std::move(rhs); | |
77 | return *this; | |
78 | } | |
79 | ||
80 | T& get() { return *get_pointer(); } | |
81 | const T& get() const { return *get_pointer(); } | |
82 | ||
83 | T* get_pointer() { return p_; } | |
84 | const T* get_pointer() const { return p_; } | |
85 | ||
86 | operator T const&() const { return this->get(); } | |
87 | operator T&() { return this->get(); } | |
88 | ||
89 | private: | |
90 | ||
91 | void assign(const T& rhs) | |
92 | { | |
93 | this->get() = rhs; | |
94 | } | |
95 | ||
96 | T* p_; | |
97 | }; | |
98 | ||
99 | // function template swap | |
100 | // | |
101 | // Swaps two forward_ast<T> objects of the same type T. | |
102 | // | |
103 | template <typename T> | |
104 | inline void swap(forward_ast<T>& lhs, forward_ast<T>& rhs) BOOST_NOEXCEPT | |
105 | { | |
106 | lhs.swap(rhs); | |
107 | } | |
108 | ||
109 | namespace detail | |
110 | { | |
111 | template <typename T> | |
112 | struct remove_forward : mpl::identity<T> | |
113 | {}; | |
114 | ||
115 | template <typename T> | |
116 | struct remove_forward<forward_ast<T>> : mpl::identity<T> | |
117 | {}; | |
118 | } | |
119 | ||
120 | template <typename ...Types> | |
121 | struct variant | |
122 | { | |
123 | // tell spirit that this is an adapted variant | |
124 | struct adapted_variant_tag; | |
125 | ||
126 | using variant_type = boost::variant<Types...>; | |
127 | using types = mpl::list<typename detail::remove_forward<Types>::type...>; | |
128 | using base_type = variant; // The current instantiation | |
129 | ||
130 | template<typename T> | |
131 | using non_self_t // used only for SFINAE checks below | |
132 | = std::enable_if_t<!(std::is_base_of<base_type | |
133 | ,std::remove_reference_t<T> | |
134 | > | |
135 | ::value) | |
136 | >; | |
137 | ||
138 | variant() : var() {} | |
139 | ||
140 | template <typename T, class = non_self_t<T>> | |
141 | explicit variant(T const& rhs) | |
142 | : var(rhs) {} | |
143 | ||
144 | template <typename T, class = non_self_t<T>> | |
145 | explicit variant(T&& rhs) | |
146 | : var(std::forward<T>(rhs)) {} | |
147 | ||
148 | variant(variant const& rhs) | |
149 | : var(rhs.var) {} | |
150 | ||
151 | variant(variant& rhs) | |
152 | : var(rhs.var) {} | |
153 | ||
154 | variant(variant&& rhs) | |
155 | : var(std::forward<variant_type>(rhs.var)) {} | |
156 | ||
157 | variant& operator=(variant const& rhs) | |
158 | { | |
159 | var = rhs.get(); | |
160 | return *this; | |
161 | } | |
162 | ||
163 | variant& operator=(variant&& rhs) | |
164 | { | |
165 | var = std::forward<variant_type>(rhs.get()); | |
166 | return *this; | |
167 | } | |
168 | ||
169 | template <typename T, class = non_self_t<T>> | |
170 | variant& operator=(T const& rhs) | |
171 | { | |
172 | var = rhs; | |
173 | return *this; | |
174 | } | |
175 | ||
176 | template <typename T, class = non_self_t<T>> | |
177 | variant& operator=(T&& rhs) | |
178 | { | |
179 | var = std::forward<T>(rhs); | |
180 | return *this; | |
181 | } | |
182 | ||
183 | template <typename F> | |
184 | typename F::result_type apply_visitor(F const& v) | |
185 | { | |
186 | return var.apply_visitor(v); | |
187 | } | |
188 | ||
189 | template <typename F> | |
190 | typename F::result_type apply_visitor(F const& v) const | |
191 | { | |
192 | return var.apply_visitor(v); | |
193 | } | |
194 | ||
195 | template <typename F> | |
196 | typename F::result_type apply_visitor(F& v) | |
197 | { | |
198 | return var.apply_visitor(v); | |
199 | } | |
200 | ||
201 | template <typename F> | |
202 | typename F::result_type apply_visitor(F& v) const | |
203 | { | |
204 | return var.apply_visitor(v); | |
205 | } | |
206 | ||
207 | variant_type const& get() const | |
208 | { | |
209 | return var; | |
210 | } | |
211 | ||
212 | variant_type& get() | |
213 | { | |
214 | return var; | |
215 | } | |
216 | ||
217 | void swap(variant& rhs) BOOST_NOEXCEPT | |
218 | { | |
219 | var.swap(rhs.var); | |
220 | } | |
221 | ||
222 | variant_type var; | |
223 | }; | |
224 | }}} | |
225 | ||
226 | namespace boost | |
227 | { | |
228 | template <typename T, typename ...Types> | |
229 | inline T const& | |
230 | get(boost::spirit::x3::variant<Types...> const& x) | |
231 | { | |
232 | return boost::get<T>(x.get()); | |
233 | } | |
234 | ||
235 | template <typename T, typename ...Types> | |
236 | inline T& | |
237 | get(boost::spirit::x3::variant<Types...>& x) | |
238 | { | |
239 | return boost::get<T>(x.get()); | |
240 | } | |
241 | ||
242 | template <typename T, typename ...Types> | |
243 | inline T const* | |
244 | get(boost::spirit::x3::variant<Types...> const* x) | |
245 | { | |
246 | return boost::get<T>(&x->get()); | |
247 | } | |
248 | ||
249 | template <typename T, typename ...Types> | |
250 | inline T* | |
251 | get(boost::spirit::x3::variant<Types...>* x) | |
252 | { | |
253 | return boost::get<T>(&x->get()); | |
254 | } | |
255 | } | |
256 | ||
257 | #endif |