[protobuf] "reflection" typedef on Extension value

[Mans Tergarden]

Hi,

i'm currently required to use in some reflection style visitor pattern to 
extract the C++ type from the generated Proto Type.

For example a Proto file like this implementing some sort of general 
[Name,Value] structure:

message Int32 {
    extend Value {
        optional int32 value = 103;
    }
    required Int32 _v = 1;
}
message Float {
    extend Value {
        optional float value = 105;
    }
    required Float _v = 1;
}
message Double {
    extend Value {
        optional double value = 106;
    }
    required Double _v = 1;
}
message Bool {
    extend Value {
        optional bool value = 107;
    }
    required Bool _v = 1;
}

message KeyValue {
    required string key = 1;
    required Value  value = 2;
}

I futher need to access the corsiponding type ... currently this would look 
like this:

::google::protobuf::internal::ExtensionIdentifier< 
::Value,::google::protobuf::internal::PrimitiveTypeTraits< 
::google::protobuf::int32 >, 5, false >    getTypeExt(int32 i) {
    return Int32::value;
};

This is very error-prone and quirky... I would be so much simple if 
Protocol Buffers would generate the type like this:
  // nested types ----------------------------------------------------

  // accessors -------------------------------------------------------

  // required .Int32 _v = 1;
  inline bool has__v() const;
  inline void clear__v();
  static const int kVFieldNumber = 1;
  inline const ::Int32& _v() const;
  inline ::Int32* mutable__v();
  inline ::Int32* release__v();
  inline void set_allocated__v(::Int32* _v);

  static const int kValueFieldNumber = 103;
  typedef ::google::protobuf::internal::ExtensionIdentifier< ::Value,
      ::google::protobuf::internal::PrimitiveTypeTraits< 
::google::protobuf::int32 >, 5, false > value_t;
  static value_t value;

Is this somehow possible?

Thank you very much!

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