You can access the messages reflectively and static_cast them to the
concrete type. Just make sure you're casting to the correct type since
otherwise it will be undefined behavior. Something like this should work:
switch ((*msgItr)->number()) {
case IncomingMessage::kCmsgFieldNumber:
onMsg(static_cast<ControlMessage>(reflection->GetMessage(msg,
*msgItr)));
case IncomingMessage::kAmsgFieldNumber:
...
}
On Fri, Nov 29, 2019 at 12:32 AM Iranjeet Singh <[email protected]>
wrote:
> I am trying to get the type of a data member inside a protobuf message and
> call the appropriate message from it.
>
> message ControlMessage{}
> message AdminMessage{}
> message ExecMessage{}
>
> message IncomingMessage{
> optional ControlMessage cmsg = 1 ;
> optional AdminMessage amsg = 2 ;
> optional ExecMessage emsg = 3 ;}
>
> void onMsg(const ControlMessage&){}void onMsg(const AdminMessage&){}void
> onMsg(const ExecMessage&){}
> int main(){
> IncomingMessage msg ;
> msg.mutable_cmsg() ;
> msg.mutable_emsg() ;
>
> auto metadata = msg.GetMetaData() ;
> auto reflection = metadata.reflection ;
> auto descriptor = metadata.descriptor ;
>
> std::vector<const FieldDescriptor*> all_fields ;
>
> reflection->ListFields( msg, &all_fields ) ;
>
> for(auto msgItr : all_fields)
> {
> // Somehow call the onMsg() overloads
> // for all the fields set inside the msg
> // msgItr is the FieldDescriptor
> }
> }
>
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