sdbus-c++ 1.1.0
High-level C++ D-Bus library based on systemd D-Bus implementation
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Types.h
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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& operator = (const ObjectPath&) = default; // Fixes gcc 8.3 error (deleted copy assignment)
159 ObjectPath(std::string path)
160 : std::string(std::move(path))
161 {}
162 using std::string::operator=;
163 };
164
165 /********************************************/
171 class Signature : public std::string
172 {
173 public:
174 using std::string::string;
175 Signature() = default; // Fixes gcc 6.3 error (default c-tor is not imported in above using declaration)
176 Signature(const Signature&) = default; // Fixes gcc 8.3 error (deleted copy constructor)
177 Signature& operator = (const Signature&) = default; // Fixes gcc 8.3 error (deleted copy assignment)
178 Signature(std::string path)
179 : std::string(std::move(path))
180 {}
181 using std::string::operator=;
182 };
183
184 struct adopt_fd_t { explicit adopt_fd_t() = default; };
185 inline constexpr adopt_fd_t adopt_fd{};
186
187 /********************************************/
198 class UnixFd
199 {
200 public:
201 UnixFd() = default;
202
203 explicit UnixFd(int fd)
204 : fd_(::dup(fd))
205 {
206 }
207
208 UnixFd(int fd, adopt_fd_t)
209 : fd_(fd)
210 {
211 }
212
213 UnixFd(const UnixFd& other)
214 {
215 *this = other;
216 }
217
218 UnixFd& operator=(const UnixFd& other)
219 {
220 close();
221 fd_ = ::dup(other.fd_);
222 return *this;
223 }
224
225 UnixFd(UnixFd&& other)
226 {
227 *this = std::move(other);
228 }
229
230 UnixFd& operator=(UnixFd&& other)
231 {
232 close();
233 fd_ = other.fd_;
234 other.fd_ = -1;
235 return *this;
236 }
237
238 ~UnixFd()
239 {
240 close();
241 }
242
243 int get() const
244 {
245 return fd_;
246 }
247
248 void reset(int fd = -1)
249 {
250 *this = UnixFd{fd};
251 }
252
253 void reset(int fd, adopt_fd_t)
254 {
255 *this = UnixFd{fd, adopt_fd};
256 }
257
258 int release()
259 {
260 auto fd = fd_;
261 fd_ = -1;
262 return fd;
263 }
264
265 bool isValid() const
266 {
267 return fd_ >= 0;
268 }
269
270 private:
271 void close()
272 {
273 if (fd_ >= 0)
274 ::close(fd_);
275 }
276
277 int fd_ = -1;
278 };
279
280}
281
282#endif /* SDBUS_CXX_TYPES_H_ */
Definition: Message.h:77
Definition: Types.h:153
Definition: Message.h:248
Definition: Types.h:172
Definition: Types.h:111
Definition: Types.h:199
Definition: Types.h:54
Definition: Types.h:184
Definition: TypeTraits.h:64