rapidjson A fast JSON parser/generator for C++ with both SAX/DOM style API

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stringbuffer.h
1 #ifndef RAPIDJSON_STRINGBUFFER_H_
2 #define RAPIDJSON_STRINGBUFFER_H_
3
4 #include "rapidjson.h"
5 #include "internal/stack.h"
6
7 namespace rapidjson {
8
9 //! Represents an in-memory output stream.
10 /*!
11 \tparam Encoding Encoding of the stream.
12 \tparam Allocator type for allocating memory buffer.
13 \implements Stream
14 */
15 template <typename Encoding, typename Allocator = CrtAllocator>
16 struct GenericStringBuffer {
17 typedef typename Encoding::Ch Ch;
18
19 GenericStringBuffer(Allocator* allocator = 0, size_t capacity = kDefaultCapacity) : stack_(allocator, capacity) {}
20
21 void Put(Ch c) { *stack_.template Push<Ch>() = c; }
22
23 void Clear() { stack_.Clear(); }
24
25 const char* GetString() const {
26 // Push and pop a null terminator. This is safe.
27 *stack_.template Push<Ch>() = '\0';
28 stack_.template Pop<Ch>(1);
29
30 return stack_.template Bottom<Ch>();
31 }
32
33 size_t Size() const { return stack_.GetSize(); }
34
35 static const size_t kDefaultCapacity = 256;
36 mutable internal::Stack<Allocator> stack_;
37 };
38
39 typedef GenericStringBuffer<UTF8<> > StringBuffer;
40
41 //! Implement specialized version of PutN() with memset() for better performance.
42 template<>
43 inline void PutN(GenericStringBuffer<UTF8<> >& stream, char c, size_t n) {
44 memset(stream.stack_.Push<char>(n), c, n * sizeof(c));
45 }
46
47 } // namespace rapidjson
48
49 #endif // RAPIDJSON_STRINGBUFFER_H_