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 // Tencent is pleased to support the open source community by making RapidJSON available.
 //
 // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip.
 //
 // Licensed under the MIT License (the "License"); you may not use this file except
 // in compliance with the License. You may obtain a copy of the License at
 //
 // http://opensource.org/licenses/MIT
 //
 // Unless required by applicable law or agreed to in writing, software distributed
 // under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 // CONDITIONS OF ANY KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations under the License.
  
 #ifndef RAPIDJSON_STRINGBUFFER_H_
 #define RAPIDJSON_STRINGBUFFER_H_
  
 #include "stream.h"
 #include "internal/stack.h"
  
 #if RAPIDJSON_HAS_CXX11_RVALUE_REFS
 #include <utility> // std::move
 #endif
  
 #include "internal/stack.h"
  
 #if defined(__clang__)
 RAPIDJSON_DIAG_PUSH
 RAPIDJSON_DIAG_OFF(c++ 98 - compat)
 #endif
  
 RAPIDJSON_NAMESPACE_BEGIN
  
  
 template <typename Encoding, typename Allocator = CrtAllocator>
 class GenericStringBuffer
 {
     public:
     typedef typename Encoding::Ch Ch;
  
     GenericStringBuffer(Allocator* allocator = 0, size_t capacity = kDefaultCapacity)
         : stack_(allocator, capacity)
     {
     }
  
 #if RAPIDJSON_HAS_CXX11_RVALUE_REFS
     GenericStringBuffer(GenericStringBuffer&& rhs) : stack_(std::move(rhs.stack_)) {}
     GenericStringBuffer& operator=(GenericStringBuffer&& rhs)
     {
         if(&rhs != this)
             stack_ = std::move(rhs.stack_);
         return *this;
     }
 #endif
  
     void Put(Ch c) { *stack_.template Push<Ch>() = c; }
     void PutUnsafe(Ch c) { *stack_.template PushUnsafe<Ch>() = c; }
     void Flush() {}
  
     void Clear() { stack_.Clear(); }
     void ShrinkToFit()
     {
         // Push and pop a null terminator. This is safe.
         *stack_.template Push<Ch>() = '\0';
         stack_.ShrinkToFit();
         stack_.template Pop<Ch>(1);
     }
  
     void Reserve(size_t count) { stack_.template Reserve<Ch>(count); }
     Ch* Push(size_t count) { return stack_.template Push<Ch>(count); }
     Ch* PushUnsafe(size_t count) { return stack_.template PushUnsafe<Ch>(count); }
     void Pop(size_t count) { stack_.template Pop<Ch>(count); }
  
     const Ch* 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 GetSize() const { return stack_.GetSize(); }
  
     size_t GetLength() const { return stack_.GetSize() / sizeof(Ch); }
  
     static const size_t kDefaultCapacity = 256;
     mutable internal::Stack<Allocator> stack_;
  
     private:
     // Prohibit copy constructor & assignment operator.
     GenericStringBuffer(const GenericStringBuffer&);
     GenericStringBuffer& operator=(const GenericStringBuffer&);
 };
  
 typedef GenericStringBuffer<UTF8<>> StringBuffer;
  
 template <typename Encoding, typename Allocator>
 inline void PutReserve(GenericStringBuffer<Encoding, Allocator>& stream, size_t count)
 {
     stream.Reserve(count);
 }
  
 template <typename Encoding, typename Allocator>
 inline void PutUnsafe(GenericStringBuffer<Encoding, Allocator>& stream, typename Encoding::Ch c)
 {
     stream.PutUnsafe(c);
 }
  
 template <>
 inline void PutN(GenericStringBuffer<UTF8<>>& stream, char c, size_t n)
 {
     std::memset(stream.stack_.Push<char>(n), c, n * sizeof(c));
 }
  
 RAPIDJSON_NAMESPACE_END
  
 #if defined(__clang__)
 RAPIDJSON_DIAG_POP
 #endif
  
 #endif // RAPIDJSON_STRINGBUFFER_H_