Qpid Proton C++ API  0.38.0
encoder.hpp
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1 #ifndef PROTON_CODEC_ENCODER_HPP
2 #define PROTON_CODEC_ENCODER_HPP
3 
4 /*
5  *
6  * Licensed to the Apache Software Foundation (ASF) under one
7  * or more contributor license agreements. See the NOTICE file
8  * distributed with this work for additional information
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14  * http://www.apache.org/licenses/LICENSE-2.0
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19  * KIND, either express or implied. See the License for the
20  * specific language governing permissions and limitations
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24 
25 #include "../internal/data.hpp"
26 #include "../internal/type_traits.hpp"
27 #include "../types_fwd.hpp"
28 #include "./common.hpp"
29 
30 #include <proton/type_compat.h>
31 
34 
35 namespace proton {
36 class scalar_base;
37 
38 namespace internal{
39 class value_base;
40 }
41 
42 namespace codec {
43 
50 class encoder : public internal::data {
51  public:
53  explicit encoder(const data& d) : data(d) {}
54 
56  PN_CPP_EXTERN explicit encoder(internal::value_base& v);
57 
66  PN_CPP_EXTERN bool encode(char* buffer, size_t& size);
67 
70  PN_CPP_EXTERN void encode(std::string&);
71 
74  PN_CPP_EXTERN std::string encode();
75 
78  PN_CPP_EXTERN encoder& operator<<(bool);
79  PN_CPP_EXTERN encoder& operator<<(uint8_t);
80  PN_CPP_EXTERN encoder& operator<<(int8_t);
81  PN_CPP_EXTERN encoder& operator<<(uint16_t);
82  PN_CPP_EXTERN encoder& operator<<(int16_t);
83  PN_CPP_EXTERN encoder& operator<<(uint32_t);
84  PN_CPP_EXTERN encoder& operator<<(int32_t);
85  PN_CPP_EXTERN encoder& operator<<(wchar_t);
86  PN_CPP_EXTERN encoder& operator<<(uint64_t);
87  PN_CPP_EXTERN encoder& operator<<(int64_t);
88  PN_CPP_EXTERN encoder& operator<<(timestamp);
89  PN_CPP_EXTERN encoder& operator<<(float);
90  PN_CPP_EXTERN encoder& operator<<(double);
91  PN_CPP_EXTERN encoder& operator<<(decimal32);
92  PN_CPP_EXTERN encoder& operator<<(decimal64);
93  PN_CPP_EXTERN encoder& operator<<(decimal128);
94  PN_CPP_EXTERN encoder& operator<<(const uuid&);
95  PN_CPP_EXTERN encoder& operator<<(const std::string&);
96  PN_CPP_EXTERN encoder& operator<<(const symbol&);
97  PN_CPP_EXTERN encoder& operator<<(const binary&);
98  PN_CPP_EXTERN encoder& operator<<(const scalar_base&);
99  PN_CPP_EXTERN encoder& operator<<(const null&);
100  PN_CPP_EXTERN encoder& operator<<(decltype(nullptr));
102 
107  PN_CPP_EXTERN encoder& operator<<(const internal::value_base&);
108 
110  PN_CPP_EXTERN encoder& operator<<(const start&);
111 
113  PN_CPP_EXTERN encoder& operator<<(const finish&);
114 
116 
117  // Undefined template to prevent pointers being implicitly converted to bool.
118  template <class T> void* operator<<(const T*);
119 
120  template <class T> struct list_cref { T& ref; list_cref(T& r) : ref(r) {} };
121  template <class T> struct map_cref { T& ref; map_cref(T& r) : ref(r) {} };
122 
123  template <class T> struct array_cref {
124  start array_start;
125  T& ref;
126  array_cref(T& r, type_id el, bool described) : array_start(ARRAY, el, described), ref(r) {}
127  };
128 
129  template <class T> static list_cref<T> list(T& x) { return list_cref<T>(x); }
130  template <class T> static map_cref<T> map(T& x) { return map_cref<T>(x); }
131  template <class T> static array_cref<T> array(T& x, type_id element, bool described=false) {
132  return array_cref<T>(x, element, described);
133  }
134 
135  template <class T> encoder& operator<<(const map_cref<T>& x) {
136  internal::state_guard sg(*this);
137  *this << start::map();
138  for (typename T::const_iterator i = x.ref.begin(); i != x.ref.end(); ++i)
139  *this << i->first << i->second;
140  *this << finish();
141  return *this;
142  }
143 
144  template <class T> encoder& operator<<(const list_cref<T>& x) {
145  internal::state_guard sg(*this);
146  *this << start::list();
147  for (typename T::const_iterator i = x.ref.begin(); i != x.ref.end(); ++i)
148  *this << *i;
149  *this << finish();
150  return *this;
151  }
152 
153  template <class T> encoder& operator<<(const array_cref<T>& x) {
154  internal::state_guard sg(*this);
155  *this << x.array_start;
156  for (typename T::const_iterator i = x.ref.begin(); i != x.ref.end(); ++i)
157  *this << *i;
158  *this << finish();
159  return *this;
160  }
162 
163  private:
164  template<class T, class U> encoder& insert(const T& x, int (*put)(pn_data_t*, U));
165  void check(long result);
166 };
167 
169 inline encoder& operator<<(encoder& e, const char* s) { return e << std::string(s); }
170 
172 template <class T> typename std::enable_if<internal::is_unknown_integer<T>::value, encoder&>::type
173 operator<<(encoder& e, T i) {
174  using namespace internal;
175  return e << static_cast<typename integer_type<sizeof(T), std::is_signed<T>::value>::type>(i);
176 }
177 
179 
180 namespace is_encodable_impl { // Protect the world from fallback operator<<
181 
182 using namespace internal;
183 
184 sfinae::no operator<<(encoder const&, const sfinae::any_t &); // Fallback
185 
186 template<typename T> struct is_encodable : public sfinae {
187  static yes test(encoder&);
188  static no test(...); // Failed test, no match.
189  static encoder* e;
190  static const T* t;
191  static bool const value = sizeof(test(*e << *t)) == sizeof(yes);
192 };
193 
194 // Avoid recursion
195 template <> struct is_encodable<value> : public std::true_type {};
196 
197 } // is_encodable_impl
198 
199 using is_encodable_impl::is_encodable;
200 
201 // Metafunction to test if a class looks like an encodable map from K to T.
202 template <class M, class K, class T, class Enable = void>
203 struct is_encodable_map : public std::false_type {};
204 
205 template <class M, class K, class T> struct is_encodable_map<
206  M, K, T, typename std::enable_if<
207  std::is_same<K, typename M::key_type>::value &&
208  std::is_same<T, typename M::mapped_type>::value &&
209  is_encodable<M>::value
210  >::type
211  > : public std::true_type {};
212 
213 
215 
216 } // codec
217 } // proton
218 
219 #endif
Arbitrary binary data.
Definition: binary.hpp:40
Unsettled API - A stream-like encoder from C++ values to AMQP bytes.
Definition: encoder.hpp:50
encoder & operator<<(const internal::value_base &)
Insert a proton::value.
bool encode(char *buffer, size_t &size)
Encode the current values into buffer and update size to reflect the number of bytes encoded.
encoder(const data &d)
Wrap Proton-C data object.
Definition: encoder.hpp:53
encoder & operator<<(const finish &)
Finish a complex type.
encoder(internal::value_base &v)
Encoder into v. Clears any current value in v.
void encode(std::string &)
Encode the current values into a std::string and resize the string if necessary.
std::string encode()
Encode the current values into a std::string.
encoder & operator<<(const start &)
Start a complex type.
A 128-bit decimal floating-point value.
Definition: decimal.hpp:52
A 32-bit decimal floating-point value.
Definition: decimal.hpp:46
A 64-bit decimal floating-point value.
Definition: decimal.hpp:49
The base class for scalar types.
Definition: scalar_base.hpp:60
A string that represents the AMQP symbol type.
Definition: symbol.hpp:35
A 64-bit timestamp in milliseconds since the Unix epoch.
Definition: timestamp.hpp:35
A 16-byte universally unique identifier.
Definition: uuid.hpp:37
A holder for any AMQP value, simple or complex.
Definition: value.hpp:57
Unsettled API - Shared codec functions.
encoder & operator<<(encoder &e, const std::deque< T, A > &x)
std::deque<T> for most T is encoded as an amqp::ARRAY (same type elements)
Definition: deque.hpp:37
Unsettled API - Finish inserting or extracting a complex type.
Definition: common.hpp:57
Unsettled API - Start encoding a complex type.
Definition: common.hpp:34
The main Proton namespace.
Definition: annotation_key.hpp:33
type_id
An identifier for AMQP types.
Definition: type_id.hpp:37
@ ARRAY
A sequence of values of the same type.
Definition: type_id.hpp:60