Qpid Proton C++  0.17.0
encoder.hpp
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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10  * to you under the Apache License, Version 2.0 (the
11  * "License"); you may not use this file except in compliance
12  * with the License. You may obtain a copy of the License at
13  *
14  * http://www.apache.org/licenses/LICENSE-2.0
15  *
16  * Unless required by applicable law or agreed to in writing,
17  * software distributed under the License is distributed on an
18  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
19  * KIND, either express or implied. See the License for the
20  * specific language governing permissions and limitations
21  * under the License.
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23  */
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 
32 namespace proton {
33 class scalar_base;
34 
35 namespace internal{
36 class value_base;
37 }
38 
39 namespace codec {
40 
47 class encoder : public internal::data {
48  public:
50  explicit encoder(const data& d) : data(d) {}
51 
53  PN_CPP_EXTERN explicit encoder(internal::value_base& v);
54 
63  PN_CPP_EXTERN bool encode(char* buffer, size_t& size);
64 
67  PN_CPP_EXTERN void encode(std::string&);
68 
71  PN_CPP_EXTERN std::string encode();
72 
75  PN_CPP_EXTERN encoder& operator<<(bool);
76  PN_CPP_EXTERN encoder& operator<<(uint8_t);
77  PN_CPP_EXTERN encoder& operator<<(int8_t);
78  PN_CPP_EXTERN encoder& operator<<(uint16_t);
79  PN_CPP_EXTERN encoder& operator<<(int16_t);
80  PN_CPP_EXTERN encoder& operator<<(uint32_t);
81  PN_CPP_EXTERN encoder& operator<<(int32_t);
82  PN_CPP_EXTERN encoder& operator<<(wchar_t);
83  PN_CPP_EXTERN encoder& operator<<(uint64_t);
84  PN_CPP_EXTERN encoder& operator<<(int64_t);
85  PN_CPP_EXTERN encoder& operator<<(timestamp);
86  PN_CPP_EXTERN encoder& operator<<(float);
87  PN_CPP_EXTERN encoder& operator<<(double);
88  PN_CPP_EXTERN encoder& operator<<(decimal32);
89  PN_CPP_EXTERN encoder& operator<<(decimal64);
90  PN_CPP_EXTERN encoder& operator<<(decimal128);
91  PN_CPP_EXTERN encoder& operator<<(const uuid&);
92  PN_CPP_EXTERN encoder& operator<<(const std::string&);
93  PN_CPP_EXTERN encoder& operator<<(const symbol&);
94  PN_CPP_EXTERN encoder& operator<<(const binary&);
95  PN_CPP_EXTERN encoder& operator<<(const scalar_base&);
96  PN_CPP_EXTERN encoder& operator<<(const null&);
98 
103  PN_CPP_EXTERN encoder& operator<<(const internal::value_base&);
104 
106  PN_CPP_EXTERN encoder& operator<<(const start&);
107 
109  PN_CPP_EXTERN encoder& operator<<(const finish&);
110 
112 
113  // Undefined template to prevent pointers being implicitly converted to bool.
114  template <class T> void* operator<<(const T*);
115 
116  template <class T> struct list_cref { T& ref; list_cref(T& r) : ref(r) {} };
117  template <class T> struct map_cref { T& ref; map_cref(T& r) : ref(r) {} };
118 
119  template <class T> struct array_cref {
120  start array_start;
121  T& ref;
122  array_cref(T& r, type_id el, bool described) : array_start(ARRAY, el, described), ref(r) {}
123  };
124 
125  template <class T> static list_cref<T> list(T& x) { return list_cref<T>(x); }
126  template <class T> static map_cref<T> map(T& x) { return map_cref<T>(x); }
127  template <class T> static array_cref<T> array(T& x, type_id element, bool described=false) {
128  return array_cref<T>(x, element, described);
129  }
130 
131  template <class T> encoder& operator<<(const map_cref<T>& x) {
132  internal::state_guard sg(*this);
133  *this << start::map();
134  for (typename T::const_iterator i = x.ref.begin(); i != x.ref.end(); ++i)
135  *this << i->first << i->second;
136  *this << finish();
137  return *this;
138  }
139 
140  template <class T> encoder& operator<<(const list_cref<T>& x) {
141  internal::state_guard sg(*this);
142  *this << start::list();
143  for (typename T::const_iterator i = x.ref.begin(); i != x.ref.end(); ++i)
144  *this << *i;
145  *this << finish();
146  return *this;
147  }
148 
149  template <class T> encoder& operator<<(const array_cref<T>& x) {
150  internal::state_guard sg(*this);
151  *this << x.array_start;
152  for (typename T::const_iterator i = x.ref.begin(); i != x.ref.end(); ++i)
153  *this << *i;
154  *this << finish();
155  return *this;
156  }
158 
159  private:
160  template<class T, class U> encoder& insert(const T& x, int (*put)(pn_data_t*, U));
161  void check(long result);
162 };
163 
165 inline encoder& operator<<(encoder& e, const char* s) { return e << std::string(s); }
166 
168 template <class T> typename internal::enable_if<internal::is_unknown_integer<T>::value, encoder&>::type
169 operator<<(encoder& e, T i) {
170  using namespace internal;
171  return e << static_cast<typename integer_type<sizeof(T), is_signed<T>::value>::type>(i);
172 }
173 
175 
176 namespace is_encodable_impl { // Protect the world from fallback operator<<
177 
178 using namespace internal;
179 
180 sfinae::no operator<<(encoder const&, const sfinae::any_t &); // Fallback
181 
182 template<typename T> struct is_encodable : public sfinae {
183  static yes test(encoder&);
184  static no test(...); // Failed test, no match.
185  static encoder* e;
186  static const T* t;
187  static bool const value = sizeof(test(*e << *t)) == sizeof(yes);
188 };
189 
190 // Avoid recursion
191 template <> struct is_encodable<value> : public true_type {};
192 
193 } // is_encodable_impl
194 
195 using is_encodable_impl::is_encodable;
196 
198 
199 } // codec
200 } // proton
201 
202 #endif
std::ostream & operator<<(std::ostream &, const binary &)
Print a binary value.
Experimental - Start encoding a complex type.
Definition: common.hpp:31
Experimental - Stream-like encoder from C++ values to AMQP bytes.
Definition: encoder.hpp:47
A sequence of values of the same type.
Definition: type_id.hpp:61
A 16-byte universally unique identifier.
Definition: uuid.hpp:34
64-bit decimal floating point.
Definition: decimal.hpp:49
encoder(const data &d)
Wrap Proton-C data object.
Definition: encoder.hpp:50
Base class for scalar types.
Definition: scalar_base.hpp:57
A std::string that represents the AMQP symbol type.
Definition: symbol.hpp:32
Arbitrary binary data.
Definition: binary.hpp:37
128-bit decimal floating point.
Definition: decimal.hpp:52
type_id
An identifier for AMQP types.
Definition: type_id.hpp:38
32-bit decimal floating point.
Definition: decimal.hpp:46
A 64-bit timestamp in milliseconds since the Unix epoch.
Definition: timestamp.hpp:32
A holder for any AMQP value, simple or complex.
Definition: value.hpp:55
Experimental - Finish inserting or extracting a complex type.
Definition: common.hpp:54
The main Proton namespace.
Definition: annotation_key.hpp:30