chromium/third_party/protobuf/src/google/protobuf/map_entry.h

// Protocol Buffers - Google's data interchange format
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#ifndef GOOGLE_PROTOBUF_MAP_ENTRY_H__
#define GOOGLE_PROTOBUF_MAP_ENTRY_H__

#include <google/protobuf/port.h>
#include <google/protobuf/generated_message_reflection.h>
#include <google/protobuf/map_entry_lite.h>
#include <google/protobuf/map_type_handler.h>
#include <google/protobuf/reflection_ops.h>
#include <google/protobuf/unknown_field_set.h>
#include <google/protobuf/wire_format_lite.h>

// Must be included last.
#include <google/protobuf/port_def.inc>

#ifdef SWIG
#error "You cannot SWIG proto headers"
#endif

namespace google {
namespace protobuf {
class Arena;
namespace internal {
template <typename Derived, typename Key, typename Value,
          WireFormatLite::FieldType kKeyFieldType,
          WireFormatLite::FieldType kValueFieldType>
class MapField;
}
}  // namespace protobuf
}  // namespace google

namespace google {
namespace protobuf {
namespace internal {

// MapEntry is the returned google::protobuf::Message when calling AddMessage of
// google::protobuf::Reflection. In order to let it work with generated message
// reflection, its in-memory type is the same as generated message with the same
// fields. However, in order to decide the in-memory type of key/value, we need
// to know both their cpp type in generated api and proto type. In
// implementation, all in-memory types have related wire format functions to
// support except ArenaStringPtr. Therefore, we need to define another type with
// supporting wire format functions. Since this type is only used as return type
// of MapEntry accessors, it's named MapEntry accessor type.
//
// cpp type:               the type visible to users in public API.
// proto type:             WireFormatLite::FieldType of the field.
// in-memory type:         type of the data member used to stored this field.
// MapEntry accessor type: type used in MapEntry getters/mutators to access the
//                         field.
//
// cpp type | proto type  | in-memory type | MapEntry accessor type
// int32_t    TYPE_INT32    int32_t          int32_t
// int32_t    TYPE_FIXED32  int32_t          int32_t
// string     TYPE_STRING   ArenaStringPtr   string
// FooEnum    TYPE_ENUM     int              int
// FooMessage TYPE_MESSAGE  FooMessage*      FooMessage
//
// The in-memory types of primitive types can be inferred from its proto type,
// while we need to explicitly specify the cpp type if proto type is
// TYPE_MESSAGE to infer the in-memory type.
template <typename Derived, typename Key, typename Value,
          WireFormatLite::FieldType kKeyFieldType,
          WireFormatLite::FieldType kValueFieldType>
class MapEntry : public MapEntryImpl<Derived, Message, Key, Value,
                                     kKeyFieldType, kValueFieldType> { … };

}  // namespace internal
}  // namespace protobuf
}  // namespace google

#include <google/protobuf/port_undef.inc>

#endif  // GOOGLE_PROTOBUF_MAP_ENTRY_H__