MongoDB C++ Driver  mongocxx-3.4.0
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/key_context.hpp>
20 #include <bsoncxx/builder/stream/value_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 
53  _core->open_document();
54 
55  return wrap_document();
56  }
57 
65  _core->open_array();
66 
67  return wrap_array();
68  }
69 
77  template <class T>
78  BSONCXX_INLINE void operator<<(T&& t) {
79  _core->append(std::forward<T>(t));
80  }
81 
82  private:
83  BSONCXX_INLINE array_context<> wrap_array() {
84  return array_context<>(_core);
85  }
86 
87  BSONCXX_INLINE key_context<> wrap_document() {
88  return key_context<>(_core);
89  }
90 
91  core* _core;
92 };
93 
97 template <class T>
99  return single_context(_core);
100 }
101 
105 template <class T>
107  return single_context(_core);
108 }
109 
110 } // namespace stream
111 } // namespace builder
112 BSONCXX_INLINE_NAMESPACE_END
113 } // namespace bsoncxx
114 
115 #include <bsoncxx/config/postlude.hpp>
A low-level interface for constructing BSON documents and arrays.
Definition: core.hpp:42
key_context operator<<(open_document_type)
<< operator for opening a new subdocument in the core builder.
Definition: single_context.hpp:52
A stream context which appends a single value.
Definition: single_context.hpp:36
core & append(const types::b_double &value)
Appends a BSON double.
void operator<<(T &&t)
<< operator for accepting a real value and appending it to the core builder.
Definition: single_context.hpp:78
core & open_document()
Opens a sub-document within this BSON datum.
core & open_array()
Opens a sub-array within this BSON datum.
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
Top level namespace for MongoDB C++ BSON functionality.
Definition: element.hpp:24