stringbuffer.h

#ifndef RAPIDJSON_STRINGBUFFER_H_
#define RAPIDJSON_STRINGBUFFER_H_

#include "rapidjson.h"
#include "internal/stack.h"

namespace rapidjson {

//! Represents an in-memory output stream.
/*!
        \tparam Encoding Encoding of the stream.
        \tparam Allocator type for allocating memory buffer.
        \implements Stream
*/
template <typename Encoding, typename Allocator = CrtAllocator>
struct GenericStringBuffer {
        typedef typename Encoding::Ch Ch;

        GenericStringBuffer(Allocator* allocator = 0, size_t capacity = kDefaultCapacity) : stack_(allocator, capacity) {}

        void Put(Ch c) { *stack_.template Push<Ch>() = c; }

        void Clear() { stack_.Clear(); }

        const char* GetString() const {
                // Push and pop a null terminator. This is safe.
                *stack_.template Push<Ch>() = '\0';
                stack_.template Pop<Ch>(1);

                return stack_.template Bottom<Ch>();
        }

        size_t Size() const { return stack_.GetSize(); }

        static const size_t kDefaultCapacity = 256;
        mutable internal::Stack<Allocator> stack_;
};

typedef GenericStringBuffer<UTF8<> > StringBuffer;

//! Implement specialized version of PutN() with memset() for better performance.
template<>
inline void PutN(GenericStringBuffer<UTF8<> >& stream, char c, size_t n) {
        memset(stream.stack_.Push<char>(n), c, n * sizeof(c));
}

} // namespace rapidjson

#endif // RAPIDJSON_STRINGBUFFER_H_