sdbus-c++ 0.8.3
High-level C++ D-Bus library based on systemd D-Bus implementation
Types.h
Go to the documentation of this file.
1
27#ifndef SDBUS_CXX_TYPES_H_
28#define SDBUS_CXX_TYPES_H_
29
30#include <sdbus-c++/Message.h>
32#include <string>
33#include <type_traits>
34#include <typeinfo>
35#include <memory>
36#include <tuple>
37#include <unistd.h>
38
39namespace sdbus {
40
41 /********************************************/
53 class Variant
54 {
55 public:
56 Variant();
57
58 template <typename _ValueType>
59 Variant(const _ValueType& value)
60 : Variant()
61 {
62 msg_.openVariant(signature_of<_ValueType>::str());
63 msg_ << value;
64 msg_.closeVariant();
65 msg_.seal();
66 }
67
68 template <typename _ValueType>
69 _ValueType get() const
70 {
71 _ValueType val;
72 msg_.rewind(false);
73 msg_.enterVariant(signature_of<_ValueType>::str());
74 msg_ >> val;
75 msg_.exitVariant();
76 return val;
77 }
78
79 // Only allow conversion operator for true D-Bus type representations in C++
80 template <typename _ValueType, typename = std::enable_if_t<signature_of<_ValueType>::is_valid>>
81 operator _ValueType() const
82 {
83 return get<_ValueType>();
84 }
85
86 template <typename _Type>
87 bool containsValueOfType() const
88 {
89 return signature_of<_Type>::str() == peekValueType();
90 }
91
92 bool isEmpty() const;
93
94 void serializeTo(Message& msg) const;
95 void deserializeFrom(Message& msg);
96 std::string peekValueType() const;
97
98 private:
99 mutable PlainMessage msg_{};
100 };
101
102 /********************************************/
108 template <typename... _ValueTypes>
109 class Struct
110 : public std::tuple<_ValueTypes...>
111 {
112 public:
113 using std::tuple<_ValueTypes...>::tuple;
114
115 // Disable constructor if an older then 7.1.0 version of GCC is used
116#if !((defined(__GNUC__) || defined(__GNUG__)) && !defined(__clang__) && !(__GNUC__ > 7 || (__GNUC__ == 7 && (__GNUC_MINOR__ > 1 || (__GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ > 0)))))
117 Struct() = default;
118
119 explicit Struct(const std::tuple<_ValueTypes...>& t)
120 : std::tuple<_ValueTypes...>(t)
121 {
122 }
123#endif
124
125 template <std::size_t _I>
126 auto& get()
127 {
128 return std::get<_I>(*this);
129 }
130
131 template <std::size_t _I>
132 const auto& get() const
133 {
134 return std::get<_I>(*this);
135 }
136 };
137
138 template<typename... _Elements>
140 make_struct(_Elements&&... args)
141 {
142 typedef Struct<std::decay_t<_Elements>...> result_type;
143 return result_type(std::forward<_Elements>(args)...);
144 }
145
146 /********************************************/
152 class ObjectPath : public std::string
153 {
154 public:
155 using std::string::string;
156 ObjectPath() = default; // Fixes gcc 6.3 error (default c-tor is not imported in above using declaration)
157 ObjectPath(const ObjectPath&) = default; // Fixes gcc 8.3 error (deleted copy constructor)
158 ObjectPath(std::string path)
159 : std::string(std::move(path))
160 {}
161 using std::string::operator=;
162 };
163
164 /********************************************/
170 class Signature : public std::string
171 {
172 public:
173 using std::string::string;
174 Signature() = default; // Fixes gcc 6.3 error (default c-tor is not imported in above using declaration)
175 Signature(const Signature&) = default; // Fixes gcc 8.3 error (deleted copy constructor)
176 Signature(std::string path)
177 : std::string(std::move(path))
178 {}
179 using std::string::operator=;
180 };
181
182 struct adopt_fd_t { explicit adopt_fd_t() = default; };
183 inline constexpr adopt_fd_t adopt_fd{};
184
185 /********************************************/
196 class UnixFd
197 {
198 public:
199 UnixFd() = default;
200
201 explicit UnixFd(int fd)
202 : fd_(::dup(fd))
203 {
204 }
205
206 UnixFd(int fd, adopt_fd_t)
207 : fd_(fd)
208 {
209 }
210
211 UnixFd(const UnixFd& other)
212 {
213 *this = other;
214 }
215
216 UnixFd& operator=(const UnixFd& other)
217 {
218 close();
219 fd_ = ::dup(other.fd_);
220 return *this;
221 }
222
223 UnixFd(UnixFd&& other)
224 {
225 *this = std::move(other);
226 }
227
228 UnixFd& operator=(UnixFd&& other)
229 {
230 close();
231 fd_ = other.fd_;
232 other.fd_ = -1;
233 return *this;
234 }
235
236 ~UnixFd()
237 {
238 close();
239 }
240
241 int get() const
242 {
243 return fd_;
244 }
245
246 void reset(int fd = -1)
247 {
248 *this = UnixFd{fd};
249 }
250
251 void reset(int fd, adopt_fd_t)
252 {
253 *this = UnixFd{fd, adopt_fd};
254 }
255
256 int release()
257 {
258 auto fd = fd_;
259 fd_ = -1;
260 return fd;
261 }
262
263 bool isValid() const
264 {
265 return fd_ >= 0;
266 }
267
268 private:
269 void close()
270 {
271 if (fd_ >= 0)
272 ::close(fd_);
273 }
274
275 int fd_ = -1;
276 };
277
278}
279
280#endif /* SDBUS_CXX_TYPES_H_ */
Definition: Message.h:75
Definition: Types.h:153
Definition: Message.h:231
Definition: Types.h:171
Definition: Types.h:111
Definition: Types.h:197
Definition: Types.h:54
Definition: Types.h:182
Definition: TypeTraits.h:64