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Diffstat (limited to 'src/google/protobuf/generated_message_reflection.h')
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diff --git a/src/google/protobuf/generated_message_reflection.h b/src/google/protobuf/generated_message_reflection.h deleted file mode 100644 index 15fc802c..00000000 --- a/src/google/protobuf/generated_message_reflection.h +++ /dev/null @@ -1,683 +0,0 @@ -// 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. - -// Author: kenton@google.com (Kenton Varda) -// Based on original Protocol Buffers design by -// Sanjay Ghemawat, Jeff Dean, and others. -// -// This header is logically internal, but is made public because it is used -// from protocol-compiler-generated code, which may reside in other components. - -#ifndef GOOGLE_PROTOBUF_GENERATED_MESSAGE_REFLECTION_H__ -#define GOOGLE_PROTOBUF_GENERATED_MESSAGE_REFLECTION_H__ - -#include <string> -#include <vector> -#include <google/protobuf/stubs/casts.h> -#include <google/protobuf/stubs/common.h> -// TODO(jasonh): Remove this once the compiler change to directly include this -// is released to components. -#include <google/protobuf/generated_enum_reflection.h> -#include <google/protobuf/message.h> -#include <google/protobuf/metadata.h> -#include <google/protobuf/unknown_field_set.h> - - -namespace google { -namespace upb { -namespace google_opensource { -class GMR_Handlers; -} // namespace google_opensource -} // namespace upb - -namespace protobuf { -class DescriptorPool; -class MapKey; -class MapValueRef; -} - -namespace protobuf { -namespace internal { -class DefaultEmptyOneof; - -// Defined in this file. -class GeneratedMessageReflection; - -// Defined in other files. -class ExtensionSet; // extension_set.h - -// THIS CLASS IS NOT INTENDED FOR DIRECT USE. It is intended for use -// by generated code. This class is just a big hack that reduces code -// size. -// -// A GeneratedMessageReflection is an implementation of Reflection -// which expects all fields to be backed by simple variables located in -// memory. The locations are given using a base pointer and a set of -// offsets. -// -// It is required that the user represents fields of each type in a standard -// way, so that GeneratedMessageReflection can cast the void* pointer to -// the appropriate type. For primitive fields and string fields, each field -// should be represented using the obvious C++ primitive type. Enums and -// Messages are different: -// - Singular Message fields are stored as a pointer to a Message. These -// should start out NULL, except for in the default instance where they -// should start out pointing to other default instances. -// - Enum fields are stored as an int. This int must always contain -// a valid value, such that EnumDescriptor::FindValueByNumber() would -// not return NULL. -// - Repeated fields are stored as RepeatedFields or RepeatedPtrFields -// of whatever type the individual field would be. Strings and -// Messages use RepeatedPtrFields while everything else uses -// RepeatedFields. -class LIBPROTOBUF_EXPORT GeneratedMessageReflection : public Reflection { - public: - // Constructs a GeneratedMessageReflection. - // Parameters: - // descriptor: The descriptor for the message type being implemented. - // default_instance: The default instance of the message. This is only - // used to obtain pointers to default instances of embedded - // messages, which GetMessage() will return if the particular - // sub-message has not been initialized yet. (Thus, all - // embedded message fields *must* have non-NULL pointers - // in the default instance.) - // offsets: An array of ints giving the byte offsets, relative to - // the start of the message object, of each field. These can - // be computed at compile time using the - // GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET() macro, defined - // below. - // has_bits_offset: Offset in the message of an array of uint32s of size - // descriptor->field_count()/32, rounded up. This is a - // bitfield where each bit indicates whether or not the - // corresponding field of the message has been initialized. - // The bit for field index i is obtained by the expression: - // has_bits[i / 32] & (1 << (i % 32)) - // unknown_fields_offset: Offset in the message of the UnknownFieldSet for - // the message. - // extensions_offset: Offset in the message of the ExtensionSet for the - // message, or -1 if the message type has no extension - // ranges. - // pool: DescriptorPool to search for extension definitions. Only - // used by FindKnownExtensionByName() and - // FindKnownExtensionByNumber(). - // factory: MessageFactory to use to construct extension messages. - // object_size: The size of a message object of this type, as measured - // by sizeof(). - GeneratedMessageReflection(const Descriptor* descriptor, - const Message* default_instance, - const int offsets[], - int has_bits_offset, - int unknown_fields_offset, - int extensions_offset, - const DescriptorPool* pool, - MessageFactory* factory, - int object_size, - int arena_offset, - int is_default_instance_offset = -1); - - // Similar with the construction above. Call this construction if the - // message has oneof definition. - // Parameters: - // offsets: An array of ints giving the byte offsets. - // For each oneof field, the offset is relative to the - // default_oneof_instance. These can be computed at compile - // time using the - // PROTO2_GENERATED_DEFAULT_ONEOF_FIELD_OFFSET() macro. - // For each none oneof field, the offset is related to - // the start of the message object. These can be computed - // at compile time using the - // GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET() macro. - // Besides offsets for all fields, this array also contains - // offsets for oneof unions. The offset of the i-th oneof - // union is offsets[descriptor->field_count() + i]. - // default_oneof_instance: The default instance of the oneofs. It is a - // struct holding the default value of all oneof fields - // for this message. It is only used to obtain pointers - // to default instances of oneof fields, which Get - // methods will return if the field is not set. - // oneof_case_offset: Offset in the message of an array of uint32s of - // size descriptor->oneof_decl_count(). Each uint32 - // indicates what field is set for each oneof. - // other parameters are the same with the construction above. - GeneratedMessageReflection(const Descriptor* descriptor, - const Message* default_instance, - const int offsets[], - int has_bits_offset, - int unknown_fields_offset, - int extensions_offset, - const void* default_oneof_instance, - int oneof_case_offset, - const DescriptorPool* pool, - MessageFactory* factory, - int object_size, - int arena_offset, - int is_default_instance_offset = -1); - ~GeneratedMessageReflection(); - - // Shorter-to-call helpers for the above two constructions that work if the - // pool and factory are the usual, namely, DescriptorPool::generated_pool() - // and MessageFactory::generated_factory(). - - static GeneratedMessageReflection* NewGeneratedMessageReflection( - const Descriptor* descriptor, - const Message* default_instance, - const int offsets[], - int has_bits_offset, - int unknown_fields_offset, - int extensions_offset, - const void* default_oneof_instance, - int oneof_case_offset, - int object_size, - int arena_offset, - int is_default_instance_offset = -1); - - static GeneratedMessageReflection* NewGeneratedMessageReflection( - const Descriptor* descriptor, - const Message* default_instance, - const int offsets[], - int has_bits_offset, - int unknown_fields_offset, - int extensions_offset, - int object_size, - int arena_offset, - int is_default_instance_offset = -1); - - // implements Reflection ------------------------------------------- - - const UnknownFieldSet& GetUnknownFields(const Message& message) const; - UnknownFieldSet* MutableUnknownFields(Message* message) const; - - int SpaceUsed(const Message& message) const; - - bool HasField(const Message& message, const FieldDescriptor* field) const; - int FieldSize(const Message& message, const FieldDescriptor* field) const; - void ClearField(Message* message, const FieldDescriptor* field) const; - bool HasOneof(const Message& message, - const OneofDescriptor* oneof_descriptor) const; - void ClearOneof(Message* message, const OneofDescriptor* field) const; - void RemoveLast(Message* message, const FieldDescriptor* field) const; - Message* ReleaseLast(Message* message, const FieldDescriptor* field) const; - void Swap(Message* message1, Message* message2) const; - void SwapFields(Message* message1, Message* message2, - const vector<const FieldDescriptor*>& fields) const; - void SwapElements(Message* message, const FieldDescriptor* field, - int index1, int index2) const; - void ListFields(const Message& message, - vector<const FieldDescriptor*>* output) const; - - int32 GetInt32 (const Message& message, - const FieldDescriptor* field) const; - int64 GetInt64 (const Message& message, - const FieldDescriptor* field) const; - uint32 GetUInt32(const Message& message, - const FieldDescriptor* field) const; - uint64 GetUInt64(const Message& message, - const FieldDescriptor* field) const; - float GetFloat (const Message& message, - const FieldDescriptor* field) const; - double GetDouble(const Message& message, - const FieldDescriptor* field) const; - bool GetBool (const Message& message, - const FieldDescriptor* field) const; - string GetString(const Message& message, - const FieldDescriptor* field) const; - const string& GetStringReference(const Message& message, - const FieldDescriptor* field, - string* scratch) const; - const EnumValueDescriptor* GetEnum(const Message& message, - const FieldDescriptor* field) const; - int GetEnumValue(const Message& message, - const FieldDescriptor* field) const; - const Message& GetMessage(const Message& message, - const FieldDescriptor* field, - MessageFactory* factory = NULL) const; - - const FieldDescriptor* GetOneofFieldDescriptor( - const Message& message, - const OneofDescriptor* oneof_descriptor) const; - - private: - bool ContainsMapKey(const Message& message, - const FieldDescriptor* field, - const MapKey& key) const; - bool InsertOrLookupMapValue(Message* message, - const FieldDescriptor* field, - const MapKey& key, - MapValueRef* val) const; - bool DeleteMapValue(Message* message, - const FieldDescriptor* field, - const MapKey& key) const; - MapIterator MapBegin( - Message* message, - const FieldDescriptor* field) const; - MapIterator MapEnd( - Message* message, - const FieldDescriptor* field) const; - int MapSize(const Message& message, const FieldDescriptor* field) const; - - public: - void SetInt32 (Message* message, - const FieldDescriptor* field, int32 value) const; - void SetInt64 (Message* message, - const FieldDescriptor* field, int64 value) const; - void SetUInt32(Message* message, - const FieldDescriptor* field, uint32 value) const; - void SetUInt64(Message* message, - const FieldDescriptor* field, uint64 value) const; - void SetFloat (Message* message, - const FieldDescriptor* field, float value) const; - void SetDouble(Message* message, - const FieldDescriptor* field, double value) const; - void SetBool (Message* message, - const FieldDescriptor* field, bool value) const; - void SetString(Message* message, - const FieldDescriptor* field, - const string& value) const; - void SetEnum (Message* message, const FieldDescriptor* field, - const EnumValueDescriptor* value) const; - void SetEnumValue(Message* message, const FieldDescriptor* field, - int value) const; - Message* MutableMessage(Message* message, const FieldDescriptor* field, - MessageFactory* factory = NULL) const; - void SetAllocatedMessage(Message* message, - Message* sub_message, - const FieldDescriptor* field) const; - Message* ReleaseMessage(Message* message, const FieldDescriptor* field, - MessageFactory* factory = NULL) const; - - int32 GetRepeatedInt32 (const Message& message, - const FieldDescriptor* field, int index) const; - int64 GetRepeatedInt64 (const Message& message, - const FieldDescriptor* field, int index) const; - uint32 GetRepeatedUInt32(const Message& message, - const FieldDescriptor* field, int index) const; - uint64 GetRepeatedUInt64(const Message& message, - const FieldDescriptor* field, int index) const; - float GetRepeatedFloat (const Message& message, - const FieldDescriptor* field, int index) const; - double GetRepeatedDouble(const Message& message, - const FieldDescriptor* field, int index) const; - bool GetRepeatedBool (const Message& message, - const FieldDescriptor* field, int index) const; - string GetRepeatedString(const Message& message, - const FieldDescriptor* field, int index) const; - const string& GetRepeatedStringReference(const Message& message, - const FieldDescriptor* field, - int index, string* scratch) const; - const EnumValueDescriptor* GetRepeatedEnum(const Message& message, - const FieldDescriptor* field, - int index) const; - int GetRepeatedEnumValue(const Message& message, - const FieldDescriptor* field, - int index) const; - const Message& GetRepeatedMessage(const Message& message, - const FieldDescriptor* field, - int index) const; - - // Set the value of a field. - void SetRepeatedInt32 (Message* message, - const FieldDescriptor* field, int index, int32 value) const; - void SetRepeatedInt64 (Message* message, - const FieldDescriptor* field, int index, int64 value) const; - void SetRepeatedUInt32(Message* message, - const FieldDescriptor* field, int index, uint32 value) const; - void SetRepeatedUInt64(Message* message, - const FieldDescriptor* field, int index, uint64 value) const; - void SetRepeatedFloat (Message* message, - const FieldDescriptor* field, int index, float value) const; - void SetRepeatedDouble(Message* message, - const FieldDescriptor* field, int index, double value) const; - void SetRepeatedBool (Message* message, - const FieldDescriptor* field, int index, bool value) const; - void SetRepeatedString(Message* message, - const FieldDescriptor* field, int index, - const string& value) const; - void SetRepeatedEnum(Message* message, const FieldDescriptor* field, - int index, const EnumValueDescriptor* value) const; - void SetRepeatedEnumValue(Message* message, const FieldDescriptor* field, - int index, int value) const; - // Get a mutable pointer to a field with a message type. - Message* MutableRepeatedMessage(Message* message, - const FieldDescriptor* field, - int index) const; - - void AddInt32 (Message* message, - const FieldDescriptor* field, int32 value) const; - void AddInt64 (Message* message, - const FieldDescriptor* field, int64 value) const; - void AddUInt32(Message* message, - const FieldDescriptor* field, uint32 value) const; - void AddUInt64(Message* message, - const FieldDescriptor* field, uint64 value) const; - void AddFloat (Message* message, - const FieldDescriptor* field, float value) const; - void AddDouble(Message* message, - const FieldDescriptor* field, double value) const; - void AddBool (Message* message, - const FieldDescriptor* field, bool value) const; - void AddString(Message* message, - const FieldDescriptor* field, const string& value) const; - void AddEnum(Message* message, - const FieldDescriptor* field, - const EnumValueDescriptor* value) const; - void AddEnumValue(Message* message, - const FieldDescriptor* field, - int value) const; - Message* AddMessage(Message* message, const FieldDescriptor* field, - MessageFactory* factory = NULL) const; - void AddAllocatedMessage( - Message* message, const FieldDescriptor* field, - Message* new_entry) const; - - const FieldDescriptor* FindKnownExtensionByName(const string& name) const; - const FieldDescriptor* FindKnownExtensionByNumber(int number) const; - - bool SupportsUnknownEnumValues() const; - - // This value for arena_offset_ indicates that there is no arena pointer in - // this message (e.g., old generated code). - static const int kNoArenaPointer = -1; - - // This value for unknown_field_offset_ indicates that there is no - // UnknownFieldSet in this message, and that instead, we are using the - // Zero-Overhead Arena Pointer trick. When this is the case, arena_offset_ - // actually indexes to an InternalMetadataWithArena instance, which can return - // either an arena pointer or an UnknownFieldSet or both. It is never the case - // that unknown_field_offset_ == kUnknownFieldSetInMetadata && arena_offset_ - // == kNoArenaPointer. - static const int kUnknownFieldSetInMetadata = -1; - - protected: - void* MutableRawRepeatedField( - Message* message, const FieldDescriptor* field, FieldDescriptor::CppType, - int ctype, const Descriptor* desc) const; - - const void* GetRawRepeatedField( - const Message& message, const FieldDescriptor* field, - FieldDescriptor::CppType, int ctype, - const Descriptor* desc) const; - - virtual MessageFactory* GetMessageFactory() const; - - virtual void* RepeatedFieldData( - Message* message, const FieldDescriptor* field, - FieldDescriptor::CppType cpp_type, - const Descriptor* message_type) const; - - private: - friend class GeneratedMessage; - - // To parse directly into a proto2 generated class, the class GMR_Handlers - // needs access to member offsets and hasbits. - friend class upb::google_opensource::GMR_Handlers; - - const Descriptor* descriptor_; - const Message* default_instance_; - const void* default_oneof_instance_; - const int* offsets_; - - int has_bits_offset_; - int oneof_case_offset_; - int unknown_fields_offset_; - int extensions_offset_; - int arena_offset_; - int is_default_instance_offset_; - int object_size_; - - static const int kHasNoDefaultInstanceField = -1; - - const DescriptorPool* descriptor_pool_; - MessageFactory* message_factory_; - - template <typename Type> - inline const Type& GetRaw(const Message& message, - const FieldDescriptor* field) const; - template <typename Type> - inline Type* MutableRaw(Message* message, - const FieldDescriptor* field) const; - template <typename Type> - inline const Type& DefaultRaw(const FieldDescriptor* field) const; - template <typename Type> - inline const Type& DefaultOneofRaw(const FieldDescriptor* field) const; - - inline const uint32* GetHasBits(const Message& message) const; - inline uint32* MutableHasBits(Message* message) const; - inline uint32 GetOneofCase( - const Message& message, - const OneofDescriptor* oneof_descriptor) const; - inline uint32* MutableOneofCase( - Message* message, - const OneofDescriptor* oneof_descriptor) const; - inline const ExtensionSet& GetExtensionSet(const Message& message) const; - inline ExtensionSet* MutableExtensionSet(Message* message) const; - inline Arena* GetArena(Message* message) const; - inline const internal::InternalMetadataWithArena& - GetInternalMetadataWithArena(const Message& message) const; - inline internal::InternalMetadataWithArena* - MutableInternalMetadataWithArena(Message* message) const; - - inline bool GetIsDefaultInstance(const Message& message) const; - - inline bool HasBit(const Message& message, - const FieldDescriptor* field) const; - inline void SetBit(Message* message, - const FieldDescriptor* field) const; - inline void ClearBit(Message* message, - const FieldDescriptor* field) const; - inline void SwapBit(Message* message1, - Message* message2, - const FieldDescriptor* field) const; - - // This function only swaps the field. Should swap corresponding has_bit - // before or after using this function. - void SwapField(Message* message1, - Message* message2, - const FieldDescriptor* field) const; - - void SwapOneofField(Message* message1, - Message* message2, - const OneofDescriptor* oneof_descriptor) const; - - inline bool HasOneofField(const Message& message, - const FieldDescriptor* field) const; - inline void SetOneofCase(Message* message, - const FieldDescriptor* field) const; - inline void ClearOneofField(Message* message, - const FieldDescriptor* field) const; - - template <typename Type> - inline const Type& GetField(const Message& message, - const FieldDescriptor* field) const; - template <typename Type> - inline void SetField(Message* message, - const FieldDescriptor* field, const Type& value) const; - template <typename Type> - inline Type* MutableField(Message* message, - const FieldDescriptor* field) const; - template <typename Type> - inline const Type& GetRepeatedField(const Message& message, - const FieldDescriptor* field, - int index) const; - template <typename Type> - inline const Type& GetRepeatedPtrField(const Message& message, - const FieldDescriptor* field, - int index) const; - template <typename Type> - inline void SetRepeatedField(Message* message, - const FieldDescriptor* field, int index, - Type value) const; - template <typename Type> - inline Type* MutableRepeatedField(Message* message, - const FieldDescriptor* field, - int index) const; - template <typename Type> - inline void AddField(Message* message, - const FieldDescriptor* field, const Type& value) const; - template <typename Type> - inline Type* AddField(Message* message, - const FieldDescriptor* field) const; - - int GetExtensionNumberOrDie(const Descriptor* type) const; - - // Internal versions of EnumValue API perform no checking. Called after checks - // by public methods. - void SetEnumValueInternal(Message* message, - const FieldDescriptor* field, - int value) const; - void SetRepeatedEnumValueInternal(Message* message, - const FieldDescriptor* field, - int index, - int value) const; - void AddEnumValueInternal(Message* message, - const FieldDescriptor* field, - int value) const; - - - Message* UnsafeArenaReleaseMessage(Message* message, - const FieldDescriptor* field, - MessageFactory* factory = NULL) const; - - void UnsafeArenaSetAllocatedMessage(Message* message, - Message* sub_message, - const FieldDescriptor* field) const; - - internal::MapFieldBase* MapData( - Message* message, const FieldDescriptor* field) const; - - GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(GeneratedMessageReflection); -}; - -// Returns the offset of the given field within the given aggregate type. -// This is equivalent to the ANSI C offsetof() macro. However, according -// to the C++ standard, offsetof() only works on POD types, and GCC -// enforces this requirement with a warning. In practice, this rule is -// unnecessarily strict; there is probably no compiler or platform on -// which the offsets of the direct fields of a class are non-constant. -// Fields inherited from superclasses *can* have non-constant offsets, -// but that's not what this macro will be used for. -#if defined(__clang__) -// For Clang we use __builtin_offsetof() and suppress the warning, -// to avoid Control Flow Integrity and UBSan vptr sanitizers from -// crashing while trying to validate the invalid reinterpet_casts. -#define GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(TYPE, FIELD) \ - _Pragma("clang diagnostic push") \ - _Pragma("clang diagnostic ignored \"-Winvalid-offsetof\"") \ - __builtin_offsetof(TYPE, FIELD) \ - _Pragma("clang diagnostic pop") -#else -// Note that we calculate relative to the pointer value 16 here since if we -// just use zero, GCC complains about dereferencing a NULL pointer. We -// choose 16 rather than some other number just in case the compiler would -// be confused by an unaligned pointer. -#define GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(TYPE, FIELD) \ - static_cast<int>( \ - reinterpret_cast<const char*>( \ - &reinterpret_cast<const TYPE*>(16)->FIELD) - \ - reinterpret_cast<const char*>(16)) -#endif - -#define PROTO2_GENERATED_DEFAULT_ONEOF_FIELD_OFFSET(ONEOF, FIELD) \ - static_cast<int>( \ - reinterpret_cast<const char*>(&(ONEOF->FIELD)) \ - - reinterpret_cast<const char*>(ONEOF)) - -// There are some places in proto2 where dynamic_cast would be useful as an -// optimization. For example, take Message::MergeFrom(const Message& other). -// For a given generated message FooMessage, we generate these two methods: -// void MergeFrom(const FooMessage& other); -// void MergeFrom(const Message& other); -// The former method can be implemented directly in terms of FooMessage's -// inline accessors, but the latter method must work with the reflection -// interface. However, if the parameter to the latter method is actually of -// type FooMessage, then we'd like to be able to just call the other method -// as an optimization. So, we use dynamic_cast to check this. -// -// That said, dynamic_cast requires RTTI, which many people like to disable -// for performance and code size reasons. When RTTI is not available, we -// still need to produce correct results. So, in this case we have to fall -// back to using reflection, which is what we would have done anyway if the -// objects were not of the exact same class. -// -// dynamic_cast_if_available() implements this logic. If RTTI is -// enabled, it does a dynamic_cast. If RTTI is disabled, it just returns -// NULL. -// -// If you need to compile without RTTI, simply #define GOOGLE_PROTOBUF_NO_RTTI. -// On MSVC, this should be detected automatically. -template<typename To, typename From> -inline To dynamic_cast_if_available(From from) { -#if defined(GOOGLE_PROTOBUF_NO_RTTI) || (defined(_MSC_VER)&&!defined(_CPPRTTI)) - return NULL; -#else - return dynamic_cast<To>(from); -#endif -} - -// Tries to downcast this message to a generated message type. -// Returns NULL if this class is not an instance of T. -// -// This is like dynamic_cast_if_available, except it works even when -// dynamic_cast is not available by using Reflection. However it only works -// with Message objects. -// -// TODO(haberman): can we remove dynamic_cast_if_available in favor of this? -template <typename T> -T* DynamicCastToGenerated(const Message* from) { - // Compile-time assert that T is a generated type that has a - // default_instance() accessor, but avoid actually calling it. - const T&(*get_default_instance)() = &T::default_instance; - (void)get_default_instance; - - // Compile-time assert that T is a subclass of google::protobuf::Message. - const Message* unused = static_cast<T*>(NULL); - (void)unused; - -#if defined(GOOGLE_PROTOBUF_NO_RTTI) || \ - (defined(_MSC_VER) && !defined(_CPPRTTI)) - bool ok = &T::default_instance() == - from->GetReflection()->GetMessageFactory()->GetPrototype( - from->GetDescriptor()); - return ok ? down_cast<T*>(from) : NULL; -#else - return dynamic_cast<T*>(from); -#endif -} - -template <typename T> -T* DynamicCastToGenerated(Message* from) { - const Message* message_const = from; - return const_cast<T*>(DynamicCastToGenerated<const T>(message_const)); -} - -} // namespace internal -} // namespace protobuf - -} // namespace google -#endif // GOOGLE_PROTOBUF_GENERATED_MESSAGE_REFLECTION_H__ |