istreamwrapper.h
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1 // Tencent is pleased to support the open source community by making RapidJSON available.
2 //
3 // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
4 //
5 // Licensed under the MIT License (the "License"); you may not use this file except
6 // in compliance with the License. You may obtain a copy of the License at
7 //
8 // http://opensource.org/licenses/MIT
9 //
10 // Unless required by applicable law or agreed to in writing, software distributed
11 // under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
12 // CONDITIONS OF ANY KIND, either express or implied. See the License for the
13 // specific language governing permissions and limitations under the License.
14 
15 #ifndef RAPIDJSON_ISTREAMWRAPPER_H_
16 #define RAPIDJSON_ISTREAMWRAPPER_H_
17 
18 #include "stream.h"
19 #include <iosfwd>
20 
21 #ifdef __clang__
22 RAPIDJSON_DIAG_PUSH
23 RAPIDJSON_DIAG_OFF(padded)
24 #endif
25 
26 #ifdef _MSC_VER
27 RAPIDJSON_DIAG_PUSH
28 RAPIDJSON_DIAG_OFF(4351) // new behavior: elements of array 'array' will be default initialized
29 #endif
30 
32 
34 
49 template <typename StreamType>
51 public:
52  typedef typename StreamType::char_type Ch;
54 
55  Ch Peek() const {
56  typename StreamType::int_type c = stream_.peek();
57  return RAPIDJSON_LIKELY(c != StreamType::traits_type::eof()) ? static_cast<Ch>(c) : static_cast<Ch>('\0');
58  }
59 
60  Ch Take() {
61  typename StreamType::int_type c = stream_.get();
62  if (RAPIDJSON_LIKELY(c != StreamType::traits_type::eof())) {
63  count_++;
64  return static_cast<Ch>(c);
65  }
66  else
67  return '\0';
68  }
69 
70  // tellg() may return -1 when failed. So we count by ourself.
71  size_t Tell() const { return count_; }
72 
73  Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
74  void Put(Ch) { RAPIDJSON_ASSERT(false); }
75  void Flush() { RAPIDJSON_ASSERT(false); }
76  size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }
77 
78  // For encoding detection only.
79  const Ch* Peek4() const {
80  RAPIDJSON_ASSERT(sizeof(Ch) == 1); // Only usable for byte stream.
81  int i;
82  bool hasError = false;
83  for (i = 0; i < 4; ++i) {
84  typename StreamType::int_type c = stream_.get();
85  if (c == StreamType::traits_type::eof()) {
86  hasError = true;
87  stream_.clear();
88  break;
89  }
90  peekBuffer_[i] = static_cast<Ch>(c);
91  }
92  for (--i; i >= 0; --i)
93  stream_.putback(peekBuffer_[i]);
94  return !hasError ? peekBuffer_ : 0;
95  }
96 
97 private:
100 
102  size_t count_;
103  mutable Ch peekBuffer_[4];
104 };
105 
108 
109 #if defined(__clang__) || defined(_MSC_VER)
110 RAPIDJSON_DIAG_POP
111 #endif
112 
114 
115 #endif // RAPIDJSON_ISTREAMWRAPPER_H_
BasicIStreamWrapper< std::istream > IStreamWrapper
size_t count_
Number of characters read. Note:
#define RAPIDJSON_ASSERT(x)
Assertion.
Definition: rapidjson.h:411
#define RAPIDJSON_NAMESPACE_END
provide custom rapidjson namespace (closing expression)
Definition: rapidjson.h:124
size_t PutEnd(Ch *)
StreamType & stream_
#define RAPIDJSON_NAMESPACE_BEGIN
provide custom rapidjson namespace (opening expression)
Definition: rapidjson.h:121
BasicIStreamWrapper(StreamType &stream)
size_t Tell() const
BasicIStreamWrapper< std::wistream > WIStreamWrapper
StreamType
#define RAPIDJSON_LIKELY(x)
Compiler branching hint for expression with high probability to be true.
Definition: rapidjson.h:468
Wrapper of std::basic_istream into RapidJSON&#39;s Stream concept.
const Ch * Peek4() const
BasicIStreamWrapper & operator=(const BasicIStreamWrapper &)
StreamType::char_type Ch


choreo_rapidjson
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autogenerated on Thu Jul 18 2019 03:59:09