src/google/protobuf/reflection_internal.h - third_party/protobuf - Git at Google

 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
 // https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
 // distribution.
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 #ifndef GOOGLE_PROTOBUF_REFLECTION_INTERNAL_H__
 #define GOOGLE_PROTOBUF_REFLECTION_INTERNAL_H__

 #include <google/protobuf/map_field.h>
 #include <google/protobuf/reflection.h>
 #include <google/protobuf/repeated_field.h>

 namespace google {
 namespace protobuf {
 namespace internal {
 // A base class for RepeatedFieldAccessor implementations that can support
 // random-access efficiently. All iterator methods delegates the work to
 // corresponding random-access methods.
 class RandomAccessRepeatedFieldAccessor : public RepeatedFieldAccessor {
  public:
   Iterator* BeginIterator(const Field* data) const override {
     return PositionToIterator(0);
   }
   Iterator* EndIterator(const Field* data) const override {
     return PositionToIterator(this->Size(data));
   }
   Iterator* CopyIterator(const Field* data,
                          const Iterator* iterator) const override {
     return const_cast<Iterator*>(iterator);
   }
   Iterator* AdvanceIterator(const Field* data,
                             Iterator* iterator) const override {
     return PositionToIterator(IteratorToPosition(iterator) + 1);
   }
   bool EqualsIterator(const Field* data, const Iterator* a,
                       const Iterator* b) const override {
     return a == b;
   }
   void DeleteIterator(const Field* data, Iterator* iterator) const override {}
   const Value* GetIteratorValue(const Field* data, const Iterator* iterator,
                                 Value* scratch_space) const override {
     return Get(data, static_cast<int>(IteratorToPosition(iterator)),
                scratch_space);
   }

  protected:
   ~RandomAccessRepeatedFieldAccessor() = default;

  private:
   static intptr_t IteratorToPosition(const Iterator* iterator) {
     return reinterpret_cast<intptr_t>(iterator);
   }
   static Iterator* PositionToIterator(intptr_t position) {
     return reinterpret_cast<Iterator*>(position);
   }
 };

 // Base class for RepeatedFieldAccessor implementations that manipulates
 // RepeatedField<T>.
 template <typename T>
 class RepeatedFieldWrapper : public RandomAccessRepeatedFieldAccessor {
  public:
   RepeatedFieldWrapper() {}
   bool IsEmpty(const Field* data) const override {
     return GetRepeatedField(data)->empty();
   }
   int Size(const Field* data) const override {
     return GetRepeatedField(data)->size();
   }
   const Value* Get(const Field* data, int index,
                    Value* scratch_space) const override {
     return ConvertFromT(GetRepeatedField(data)->Get(index), scratch_space);
   }
   void Clear(Field* data) const override {
     MutableRepeatedField(data)->Clear();
   }
   void Set(Field* data, int index, const Value* value) const override {
     MutableRepeatedField(data)->Set(index, ConvertToT(value));
   }
   void Add(Field* data, const Value* value) const override {
     MutableRepeatedField(data)->Add(ConvertToT(value));
   }
   void RemoveLast(Field* data) const override {
     MutableRepeatedField(data)->RemoveLast();
   }
   void SwapElements(Field* data, int index1, int index2) const override {
     MutableRepeatedField(data)->SwapElements(index1, index2);
   }

  protected:
   ~RepeatedFieldWrapper() = default;
   typedef RepeatedField<T> RepeatedFieldType;
   static const RepeatedFieldType* GetRepeatedField(const Field* data) {
     return reinterpret_cast<const RepeatedFieldType*>(data);
   }
   static RepeatedFieldType* MutableRepeatedField(Field* data) {
     return reinterpret_cast<RepeatedFieldType*>(data);
   }

   // Convert an object received by this accessor to an object to be stored in
   // the underlying RepeatedField.
   virtual T ConvertToT(const Value* value) const = 0;

   // Convert an object stored in RepeatedPtrField to an object that will be
   // returned by this accessor. If the two objects have the same type (true for
   // string fields with ctype=STRING), a pointer to the source object can be
   // returned directly. Otherwise, data should be copied from value to
   // scratch_space and scratch_space should be returned.
   virtual const Value* ConvertFromT(const T& value,
                                     Value* scratch_space) const = 0;
 };

 // Base class for RepeatedFieldAccessor implementations that manipulates
 // RepeatedPtrField<T>.
 template <typename T>
 class RepeatedPtrFieldWrapper : public RandomAccessRepeatedFieldAccessor {
  public:
   bool IsEmpty(const Field* data) const override {
     return GetRepeatedField(data)->empty();
   }
   int Size(const Field* data) const override {
     return GetRepeatedField(data)->size();
   }
   const Value* Get(const Field* data, int index,
                    Value* scratch_space) const override {
     return ConvertFromT(GetRepeatedField(data)->Get(index), scratch_space);
   }
   void Clear(Field* data) const override {
     MutableRepeatedField(data)->Clear();
   }
   void Set(Field* data, int index, const Value* value) const override {
     ConvertToT(value, MutableRepeatedField(data)->Mutable(index));
   }
   void Add(Field* data, const Value* value) const override {
     T* allocated = New(value);
     ConvertToT(value, allocated);
     MutableRepeatedField(data)->AddAllocated(allocated);
   }
   void RemoveLast(Field* data) const override {
     MutableRepeatedField(data)->RemoveLast();
   }
   void SwapElements(Field* data, int index1, int index2) const override {
     MutableRepeatedField(data)->SwapElements(index1, index2);
   }

  protected:
   ~RepeatedPtrFieldWrapper() = default;
   typedef RepeatedPtrField<T> RepeatedFieldType;
   static const RepeatedFieldType* GetRepeatedField(const Field* data) {
     return reinterpret_cast<const RepeatedFieldType*>(data);
   }
   static RepeatedFieldType* MutableRepeatedField(Field* data) {
     return reinterpret_cast<RepeatedFieldType*>(data);
   }

   // Create a new T instance. For repeated message fields, T can be specified
   // as google::protobuf::Message so we can't use "new T()" directly. In that case, value
   // should be a message of the same type (it's ensured by the caller) and a
   // new message object will be created using it.
   virtual T* New(const Value* value) const = 0;

   // Convert an object received by this accessor to an object that will be
   // stored in the underlying RepeatedPtrField.
   virtual void ConvertToT(const Value* value, T* result) const = 0;

   // Convert an object stored in RepeatedPtrField to an object that will be
   // returned by this accessor. If the two objects have the same type (true for
   // string fields with ctype=STRING), a pointer to the source object can be
   // returned directly. Otherwise, data should be copied from value to
   // scratch_space and scratch_space should be returned.
   virtual const Value* ConvertFromT(const T& value,
                                     Value* scratch_space) const = 0;
 };

 // An implementation of RandomAccessRepeatedFieldAccessor that manipulates
 // MapFieldBase.
 class MapFieldAccessor final : public RandomAccessRepeatedFieldAccessor {
  public:
   MapFieldAccessor() {}
   virtual ~MapFieldAccessor() {}
   bool IsEmpty(const Field* data) const override {
     return GetRepeatedField(data)->empty();
   }
   int Size(const Field* data) const override {
     return GetRepeatedField(data)->size();
   }
   const Value* Get(const Field* data, int index,
                    Value* scratch_space) const override {
     return ConvertFromEntry(GetRepeatedField(data)->Get(index), scratch_space);
   }
   void Clear(Field* data) const override {
     MutableRepeatedField(data)->Clear();
   }
   void Set(Field* data, int index, const Value* value) const override {
     ConvertToEntry(value, MutableRepeatedField(data)->Mutable(index));
   }
   void Add(Field* data, const Value* value) const override {
     Message* allocated = New(value);
     ConvertToEntry(value, allocated);
     MutableRepeatedField(data)->AddAllocated(allocated);
   }
   void RemoveLast(Field* data) const override {
     MutableRepeatedField(data)->RemoveLast();
   }
   void SwapElements(Field* data, int index1, int index2) const override {
     MutableRepeatedField(data)->SwapElements(index1, index2);
   }
   void Swap(Field* data, const internal::RepeatedFieldAccessor* other_mutator,
             Field* other_data) const override {
     GOOGLE_CHECK(this == other_mutator);
     MutableRepeatedField(data)->Swap(MutableRepeatedField(other_data));
   }

  protected:
   typedef RepeatedPtrField<Message> RepeatedFieldType;
   static const RepeatedFieldType* GetRepeatedField(const Field* data) {
     return reinterpret_cast<const RepeatedFieldType*>(
         (&reinterpret_cast<const MapFieldBase*>(data)->GetRepeatedField()));
   }
   static RepeatedFieldType* MutableRepeatedField(Field* data) {
     return reinterpret_cast<RepeatedFieldType*>(
         reinterpret_cast<MapFieldBase*>(data)->MutableRepeatedField());
   }
   virtual Message* New(const Value* value) const {
     return static_cast<const Message*>(value)->New();
   }
   // Convert an object received by this accessor to an MapEntry message to be
   // stored in the underlying MapFieldBase.
   virtual void ConvertToEntry(const Value* value, Message* result) const {
     result->CopyFrom(*static_cast<const Message*>(value));
   }
   // Convert a MapEntry message stored in the underlying MapFieldBase to an
   // object that will be returned by this accessor.
   virtual const Value* ConvertFromEntry(const Message& value,
                                         Value* scratch_space) const {
     return static_cast<const Value*>(&value);
   }
 };

 // Default implementations of RepeatedFieldAccessor for primitive types.
 template <typename T>
 class RepeatedFieldPrimitiveAccessor final : public RepeatedFieldWrapper<T> {
   typedef void Field;
   typedef void Value;
   using RepeatedFieldWrapper<T>::MutableRepeatedField;

  public:
   RepeatedFieldPrimitiveAccessor() {}
   void Swap(Field* data, const internal::RepeatedFieldAccessor* other_mutator,
             Field* other_data) const override {
     // Currently RepeatedFieldPrimitiveAccessor is the only implementation of
     // RepeatedFieldAccessor for primitive types. As we are using singletons
     // for these accessors, here "other_mutator" must be "this".
     GOOGLE_CHECK(this == other_mutator);
     MutableRepeatedField(data)->Swap(MutableRepeatedField(other_data));
   }

  protected:
   T ConvertToT(const Value* value) const override {
     return *static_cast<const T*>(value);
   }
   const Value* ConvertFromT(const T& value,
                             Value* scratch_space) const override {
     return static_cast<const Value*>(&value);
   }
 };

 // Default implementation of RepeatedFieldAccessor for string fields with
 // ctype=STRING.
 class RepeatedPtrFieldStringAccessor final
     : public RepeatedPtrFieldWrapper<std::string> {
   typedef void Field;
   typedef void Value;
   using RepeatedFieldAccessor::Add;

  public:
   RepeatedPtrFieldStringAccessor() {}
   void Swap(Field* data, const internal::RepeatedFieldAccessor* other_mutator,
             Field* other_data) const override {
     if (this == other_mutator) {
       MutableRepeatedField(data)->Swap(MutableRepeatedField(other_data));
     } else {
       RepeatedPtrField<std::string> tmp;
       tmp.Swap(MutableRepeatedField(data));
       int other_size = other_mutator->Size(other_data);
       for (int i = 0; i < other_size; ++i) {
         Add<std::string>(data, other_mutator->Get<std::string>(other_data, i));
       }
       int size = Size(data);
       other_mutator->Clear(other_data);
       for (int i = 0; i < size; ++i) {
         other_mutator->Add<std::string>(other_data, tmp.Get(i));
       }
     }
   }

  protected:
   std::string* New(const Value*) const override { return new std::string(); }
   void ConvertToT(const Value* value, std::string* result) const override {
     *result = *static_cast<const std::string*>(value);
   }
   const Value* ConvertFromT(const std::string& value,
                             Value* scratch_space) const override {
     return static_cast<const Value*>(&value);
   }
 };


 class RepeatedPtrFieldMessageAccessor final
     : public RepeatedPtrFieldWrapper<Message> {
   typedef void Field;
   typedef void Value;

  public:
   RepeatedPtrFieldMessageAccessor() {}
   void Swap(Field* data, const internal::RepeatedFieldAccessor* other_mutator,
             Field* other_data) const override {
     GOOGLE_CHECK(this == other_mutator);
     MutableRepeatedField(data)->Swap(MutableRepeatedField(other_data));
   }

  protected:
   Message* New(const Value* value) const override {
     return static_cast<const Message*>(value)->New();
   }
   void ConvertToT(const Value* value, Message* result) const override {
     result->CopyFrom(*static_cast<const Message*>(value));
   }
   const Value* ConvertFromT(const Message& value,
                             Value* scratch_space) const override {
     return static_cast<const Value*>(&value);
   }
 };
 }  // namespace internal
 }  // namespace protobuf
 }  // namespace google

 #endif  // GOOGLE_PROTOBUF_REFLECTION_INTERNAL_H__
	// Protocol Buffers - Google's data interchange format
	// Copyright 2008 Google Inc. All rights reserved.
	// https://developers.google.com/protocol-buffers/
	//
	// Redistribution and use in source and binary forms, with or without
	// modification, are permitted provided that the following conditions are
	// met:
	//
	// * Redistributions of source code must retain the above copyright
	// notice, this list of conditions and the following disclaimer.
	// * Redistributions in binary form must reproduce the above
	// copyright notice, this list of conditions and the following disclaimer
	// in the documentation and/or other materials provided with the
	// distribution.
	// * Neither the name of Google Inc. nor the names of its
	// contributors may be used to endorse or promote products derived from
	// this software without specific prior written permission.
	//
	// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	#ifndef GOOGLE_PROTOBUF_REFLECTION_INTERNAL_H__
	#define GOOGLE_PROTOBUF_REFLECTION_INTERNAL_H__

	#include <google/protobuf/map_field.h>
	#include <google/protobuf/reflection.h>
	#include <google/protobuf/repeated_field.h>

	namespace google {
	namespace protobuf {
	namespace internal {
	// A base class for RepeatedFieldAccessor implementations that can support
	// random-access efficiently. All iterator methods delegates the work to
	// corresponding random-access methods.
	class RandomAccessRepeatedFieldAccessor : public RepeatedFieldAccessor {
	public:
	Iterator* BeginIterator(const Field* data) const override {
	return PositionToIterator(0);
	}
	Iterator* EndIterator(const Field* data) const override {
	return PositionToIterator(this->Size(data));
	}
	Iterator* CopyIterator(const Field* data,
	const Iterator* iterator) const override {
	return const_cast<Iterator*>(iterator);
	}
	Iterator* AdvanceIterator(const Field* data,
	Iterator* iterator) const override {
	return PositionToIterator(IteratorToPosition(iterator) + 1);
	}
	bool EqualsIterator(const Field* data, const Iterator* a,
	const Iterator* b) const override {
	return a == b;
	}
	void DeleteIterator(const Field* data, Iterator* iterator) const override {}
	const Value* GetIteratorValue(const Field* data, const Iterator* iterator,
	Value* scratch_space) const override {
	return Get(data, static_cast<int>(IteratorToPosition(iterator)),
	scratch_space);
	}

	protected:
	~RandomAccessRepeatedFieldAccessor() = default;

	private:
	static intptr_t IteratorToPosition(const Iterator* iterator) {
	return reinterpret_cast<intptr_t>(iterator);
	}
	static Iterator* PositionToIterator(intptr_t position) {
	return reinterpret_cast<Iterator*>(position);
	}
	};

	// Base class for RepeatedFieldAccessor implementations that manipulates
	// RepeatedField<T>.
	template <typename T>
	class RepeatedFieldWrapper : public RandomAccessRepeatedFieldAccessor {
	public:
	RepeatedFieldWrapper() {}
	bool IsEmpty(const Field* data) const override {
	return GetRepeatedField(data)->empty();
	}
	int Size(const Field* data) const override {
	return GetRepeatedField(data)->size();
	}
	const Value* Get(const Field* data, int index,
	Value* scratch_space) const override {
	return ConvertFromT(GetRepeatedField(data)->Get(index), scratch_space);
	}
	void Clear(Field* data) const override {
	MutableRepeatedField(data)->Clear();
	}
	void Set(Field* data, int index, const Value* value) const override {
	MutableRepeatedField(data)->Set(index, ConvertToT(value));
	}
	void Add(Field* data, const Value* value) const override {
	MutableRepeatedField(data)->Add(ConvertToT(value));
	}
	void RemoveLast(Field* data) const override {
	MutableRepeatedField(data)->RemoveLast();
	}
	void SwapElements(Field* data, int index1, int index2) const override {
	MutableRepeatedField(data)->SwapElements(index1, index2);
	}

	protected:
	~RepeatedFieldWrapper() = default;
	typedef RepeatedField<T> RepeatedFieldType;
	static const RepeatedFieldType* GetRepeatedField(const Field* data) {
	return reinterpret_cast<const RepeatedFieldType*>(data);
	}
	static RepeatedFieldType* MutableRepeatedField(Field* data) {
	return reinterpret_cast<RepeatedFieldType*>(data);
	}

	// Convert an object received by this accessor to an object to be stored in
	// the underlying RepeatedField.
	virtual T ConvertToT(const Value* value) const = 0;

	// Convert an object stored in RepeatedPtrField to an object that will be
	// returned by this accessor. If the two objects have the same type (true for
	// string fields with ctype=STRING), a pointer to the source object can be
	// returned directly. Otherwise, data should be copied from value to
	// scratch_space and scratch_space should be returned.
	virtual const Value* ConvertFromT(const T& value,
	Value* scratch_space) const = 0;
	};

	// Base class for RepeatedFieldAccessor implementations that manipulates
	// RepeatedPtrField<T>.
	template <typename T>
	class RepeatedPtrFieldWrapper : public RandomAccessRepeatedFieldAccessor {
	public:
	bool IsEmpty(const Field* data) const override {
	return GetRepeatedField(data)->empty();
	}
	int Size(const Field* data) const override {
	return GetRepeatedField(data)->size();
	}
	const Value* Get(const Field* data, int index,
	Value* scratch_space) const override {
	return ConvertFromT(GetRepeatedField(data)->Get(index), scratch_space);
	}
	void Clear(Field* data) const override {
	MutableRepeatedField(data)->Clear();
	}
	void Set(Field* data, int index, const Value* value) const override {
	ConvertToT(value, MutableRepeatedField(data)->Mutable(index));
	}
	void Add(Field* data, const Value* value) const override {
	T* allocated = New(value);
	ConvertToT(value, allocated);
	MutableRepeatedField(data)->AddAllocated(allocated);
	}
	void RemoveLast(Field* data) const override {
	MutableRepeatedField(data)->RemoveLast();
	}
	void SwapElements(Field* data, int index1, int index2) const override {
	MutableRepeatedField(data)->SwapElements(index1, index2);
	}

	protected:
	~RepeatedPtrFieldWrapper() = default;
	typedef RepeatedPtrField<T> RepeatedFieldType;
	static const RepeatedFieldType* GetRepeatedField(const Field* data) {
	return reinterpret_cast<const RepeatedFieldType*>(data);
	}
	static RepeatedFieldType* MutableRepeatedField(Field* data) {
	return reinterpret_cast<RepeatedFieldType*>(data);
	}

	// Create a new T instance. For repeated message fields, T can be specified
	// as google::protobuf::Message so we can't use "new T()" directly. In that case, value
	// should be a message of the same type (it's ensured by the caller) and a
	// new message object will be created using it.
	virtual T* New(const Value* value) const = 0;

	// Convert an object received by this accessor to an object that will be
	// stored in the underlying RepeatedPtrField.
	virtual void ConvertToT(const Value* value, T* result) const = 0;

	// Convert an object stored in RepeatedPtrField to an object that will be
	// returned by this accessor. If the two objects have the same type (true for
	// string fields with ctype=STRING), a pointer to the source object can be
	// returned directly. Otherwise, data should be copied from value to
	// scratch_space and scratch_space should be returned.
	virtual const Value* ConvertFromT(const T& value,
	Value* scratch_space) const = 0;
	};

	// An implementation of RandomAccessRepeatedFieldAccessor that manipulates
	// MapFieldBase.
	class MapFieldAccessor final : public RandomAccessRepeatedFieldAccessor {
	public:
	MapFieldAccessor() {}
	virtual ~MapFieldAccessor() {}
	bool IsEmpty(const Field* data) const override {
	return GetRepeatedField(data)->empty();
	}
	int Size(const Field* data) const override {
	return GetRepeatedField(data)->size();
	}
	const Value* Get(const Field* data, int index,
	Value* scratch_space) const override {
	return ConvertFromEntry(GetRepeatedField(data)->Get(index), scratch_space);
	}
	void Clear(Field* data) const override {
	MutableRepeatedField(data)->Clear();
	}
	void Set(Field* data, int index, const Value* value) const override {
	ConvertToEntry(value, MutableRepeatedField(data)->Mutable(index));
	}
	void Add(Field* data, const Value* value) const override {
	Message* allocated = New(value);
	ConvertToEntry(value, allocated);
	MutableRepeatedField(data)->AddAllocated(allocated);
	}
	void RemoveLast(Field* data) const override {
	MutableRepeatedField(data)->RemoveLast();
	}
	void SwapElements(Field* data, int index1, int index2) const override {
	MutableRepeatedField(data)->SwapElements(index1, index2);
	}
	void Swap(Field* data, const internal::RepeatedFieldAccessor* other_mutator,
	Field* other_data) const override {
	GOOGLE_CHECK(this == other_mutator);
	MutableRepeatedField(data)->Swap(MutableRepeatedField(other_data));
	}

	protected:
	typedef RepeatedPtrField<Message> RepeatedFieldType;
	static const RepeatedFieldType* GetRepeatedField(const Field* data) {
	return reinterpret_cast<const RepeatedFieldType*>(
	(&reinterpret_cast<const MapFieldBase*>(data)->GetRepeatedField()));
	}
	static RepeatedFieldType* MutableRepeatedField(Field* data) {
	return reinterpret_cast<RepeatedFieldType*>(
	reinterpret_cast<MapFieldBase*>(data)->MutableRepeatedField());
	}
	virtual Message* New(const Value* value) const {
	return static_cast<const Message*>(value)->New();
	}
	// Convert an object received by this accessor to an MapEntry message to be
	// stored in the underlying MapFieldBase.
	virtual void ConvertToEntry(const Value* value, Message* result) const {
	result->CopyFrom(static_cast<const Message>(value));
	}
	// Convert a MapEntry message stored in the underlying MapFieldBase to an
	// object that will be returned by this accessor.
	virtual const Value* ConvertFromEntry(const Message& value,
	Value* scratch_space) const {
	return static_cast<const Value*>(&value);
	}
	};

	// Default implementations of RepeatedFieldAccessor for primitive types.
	template <typename T>
	class RepeatedFieldPrimitiveAccessor final : public RepeatedFieldWrapper<T> {
	typedef void Field;
	typedef void Value;
	using RepeatedFieldWrapper<T>::MutableRepeatedField;

	public:
	RepeatedFieldPrimitiveAccessor() {}
	void Swap(Field* data, const internal::RepeatedFieldAccessor* other_mutator,
	Field* other_data) const override {
	// Currently RepeatedFieldPrimitiveAccessor is the only implementation of
	// RepeatedFieldAccessor for primitive types. As we are using singletons
	// for these accessors, here "other_mutator" must be "this".
	GOOGLE_CHECK(this == other_mutator);
	MutableRepeatedField(data)->Swap(MutableRepeatedField(other_data));
	}

	protected:
	T ConvertToT(const Value* value) const override {
	return static_cast<const T>(value);
	}
	const Value* ConvertFromT(const T& value,
	Value* scratch_space) const override {
	return static_cast<const Value*>(&value);
	}
	};

	// Default implementation of RepeatedFieldAccessor for string fields with
	// ctype=STRING.
	class RepeatedPtrFieldStringAccessor final
	: public RepeatedPtrFieldWrapper<std::string> {
	typedef void Field;
	typedef void Value;
	using RepeatedFieldAccessor::Add;

	public:
	RepeatedPtrFieldStringAccessor() {}
	void Swap(Field* data, const internal::RepeatedFieldAccessor* other_mutator,
	Field* other_data) const override {
	if (this == other_mutator) {
	MutableRepeatedField(data)->Swap(MutableRepeatedField(other_data));
	} else {
	RepeatedPtrField<std::string> tmp;
	tmp.Swap(MutableRepeatedField(data));
	int other_size = other_mutator->Size(other_data);
	for (int i = 0; i < other_size; ++i) {
	Add<std::string>(data, other_mutator->Get<std::string>(other_data, i));
	}
	int size = Size(data);
	other_mutator->Clear(other_data);
	for (int i = 0; i < size; ++i) {
	other_mutator->Add<std::string>(other_data, tmp.Get(i));
	}
	}
	}

	protected:
	std::string* New(const Value*) const override { return new std::string(); }
	void ConvertToT(const Value* value, std::string* result) const override {
	result = static_cast<const std::string*>(value);
	}
	const Value* ConvertFromT(const std::string& value,
	Value* scratch_space) const override {
	return static_cast<const Value*>(&value);
	}
	};


	class RepeatedPtrFieldMessageAccessor final
	: public RepeatedPtrFieldWrapper<Message> {
	typedef void Field;
	typedef void Value;

	public:
	RepeatedPtrFieldMessageAccessor() {}
	void Swap(Field* data, const internal::RepeatedFieldAccessor* other_mutator,
	Field* other_data) const override {
	GOOGLE_CHECK(this == other_mutator);
	MutableRepeatedField(data)->Swap(MutableRepeatedField(other_data));
	}

	protected:
	Message* New(const Value* value) const override {
	return static_cast<const Message*>(value)->New();
	}
	void ConvertToT(const Value* value, Message* result) const override {
	result->CopyFrom(static_cast<const Message>(value));
	}
	const Value* ConvertFromT(const Message& value,
	Value* scratch_space) const override {
	return static_cast<const Value*>(&value);
	}
	};
	} // namespace internal
	} // namespace protobuf
	} // namespace google

	#endif // GOOGLE_PROTOBUF_REFLECTION_INTERNAL_H__