MongoDB C++ Driver  mongocxx-3.0.1
single_context.hpp
1 // Copyright 2014 MongoDB Inc.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 #pragma once
16 
17 #include <bsoncxx/builder/core.hpp>
18 #include <bsoncxx/builder/stream/array_context.hpp>
19 #include <bsoncxx/builder/stream/value_context.hpp>
20 #include <bsoncxx/builder/stream/key_context.hpp>
21 
22 #include <bsoncxx/config/prelude.hpp>
23 
24 namespace bsoncxx {
25 BSONCXX_INLINE_NAMESPACE_BEGIN
26 namespace builder {
27 namespace stream {
28 
37  public:
44  BSONCXX_INLINE single_context(core* core) : _core(core) {
45  }
46 
54  _core->open_document();
55 
56  return wrap_document();
57  }
58 
66  _core->open_array();
67 
68  return wrap_array();
69  }
70 
78  template <class T>
79  BSONCXX_INLINE void operator<<(T&& t) {
80  _core->append(std::forward<T>(t));
81  }
82 
83  private:
84  BSONCXX_INLINE array_context<single_context> wrap_array() {
85  return array_context<single_context>(_core);
86  }
87 
88  BSONCXX_INLINE key_context<single_context> wrap_document() {
89  return key_context<single_context>(_core);
90  }
91 
92  core* _core;
93 };
94 
98 template <class T>
100  return single_context(_core);
101 }
102 
106 template <class T>
108  return single_context(_core);
109 }
110 
111 } // namespace stream
112 } // namespace builder
113 BSONCXX_INLINE_NAMESPACE_END
114 } // namespace bsoncxx
115 
116 #include <bsoncxx/config/postlude.hpp>
A low-level interface for constructing BSON documents and arrays.
Definition: core.hpp:42
A stream context which expects any number of values.
Definition: array_context.hpp:52
A stream context which expects a key, which can later be followed by value, then more key/value pairs...
Definition: array_context.hpp:32
A stream context which appends a single value.
Definition: single_context.hpp:36
void open_array()
Opens a sub-array within this BSON datum.
void append(const types::b_double &value)
Append a BSON double.
void operator<<(T &&t)
<< operator for accepting a real value and appending it to the core builder.
Definition: single_context.hpp:79
key_context< single_context > operator<<(open_document_type)
<< operator for opening a new subdocument in the core builder.
Definition: single_context.hpp:53
A stream context which expects a value, which can later be followed by more key/value pairs...
Definition: value_context.hpp:48
single_context(core *core)
Create a single_context given a core builder.
Definition: single_context.hpp:44
Definition: element.hpp:24
void open_document()
Opens a sub-document within this BSON datum.