1 // Tencent is pleased to support the open source community by making RapidJSON available.
3 // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
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
8 // http://opensource.org/licenses/MIT
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.
15 #ifndef RAPIDJSON_STRINGBUFFER_H_
16 #define RAPIDJSON_STRINGBUFFER_H_
19 #include "internal/stack.h"
21 #if RAPIDJSON_HAS_CXX11_RVALUE_REFS
22 #include <utility> // std::move
25 #include "internal/stack.h"
27 #if defined(__clang__)
29 RAPIDJSON_DIAG_OFF(c++98-compat)
32 RAPIDJSON_NAMESPACE_BEGIN
34 //! Represents an in-memory output stream.
36 \tparam Encoding Encoding of the stream.
37 \tparam Allocator type for allocating memory buffer.
38 \note implements Stream concept
40 template <typename Encoding, typename Allocator = CrtAllocator>
41 class GenericStringBuffer {
43 typedef typename Encoding::Ch Ch;
45 GenericStringBuffer(Allocator* allocator = 0, size_t capacity = kDefaultCapacity) : stack_(allocator, capacity) {}
47 #if RAPIDJSON_HAS_CXX11_RVALUE_REFS
48 GenericStringBuffer(GenericStringBuffer&& rhs) : stack_(std::move(rhs.stack_)) {}
49 GenericStringBuffer& operator=(GenericStringBuffer&& rhs) {
51 stack_ = std::move(rhs.stack_);
56 void Put(Ch c) { *stack_.template Push<Ch>() = c; }
57 void PutUnsafe(Ch c) { *stack_.template PushUnsafe<Ch>() = c; }
60 void Clear() { stack_.Clear(); }
62 // Push and pop a null terminator. This is safe.
63 *stack_.template Push<Ch>() = '\0';
65 stack_.template Pop<Ch>(1);
68 void Reserve(size_t count) { stack_.template Reserve<Ch>(count); }
69 Ch* Push(size_t count) { return stack_.template Push<Ch>(count); }
70 Ch* PushUnsafe(size_t count) { return stack_.template PushUnsafe<Ch>(count); }
71 void Pop(size_t count) { stack_.template Pop<Ch>(count); }
73 const Ch* GetString() const {
74 // Push and pop a null terminator. This is safe.
75 *stack_.template Push<Ch>() = '\0';
76 stack_.template Pop<Ch>(1);
78 return stack_.template Bottom<Ch>();
81 size_t GetSize() const { return stack_.GetSize(); }
83 static const size_t kDefaultCapacity = 256;
84 mutable internal::Stack<Allocator> stack_;
87 // Prohibit copy constructor & assignment operator.
88 GenericStringBuffer(const GenericStringBuffer&);
89 GenericStringBuffer& operator=(const GenericStringBuffer&);
92 //! String buffer with UTF8 encoding
93 typedef GenericStringBuffer<UTF8<> > StringBuffer;
95 template<typename Encoding, typename Allocator>
96 inline void PutReserve(GenericStringBuffer<Encoding, Allocator>& stream, size_t count) {
97 stream.Reserve(count);
100 template<typename Encoding, typename Allocator>
101 inline void PutUnsafe(GenericStringBuffer<Encoding, Allocator>& stream, typename Encoding::Ch c) {
105 //! Implement specialized version of PutN() with memset() for better performance.
107 inline void PutN(GenericStringBuffer<UTF8<> >& stream, char c, size_t n) {
108 std::memset(stream.stack_.Push<char>(n), c, n * sizeof(c));
111 RAPIDJSON_NAMESPACE_END
113 #if defined(__clang__)
117 #endif // RAPIDJSON_STRINGBUFFER_H_