Hi Bo,

Thanks for your response. Would using 'Any' in this fashion change the 
format on the wire? How can I edit the proto file to maintain the format on 
the wire (maintaining backward compatibility with older message decoders)?

Thanks,
rc

On Monday, June 5, 2017 at 1:21:03 PM UTC-7, Bo Yang wrote:
>
> message Vehicles {
>   Any extending = 1;
> }
>
> // cpp code ==================
> Car car = new Car();
> UnpackAny(vehicles.extending, &car);
>
> On Mon, Jun 5, 2017 at 11:48 AM R.C. <karsh...@gmail.com <javascript:>> 
> wrote:
>
>> Hi,
>>
>> I am looking to move an application written with proto2 to use proto3. I 
>> understand 'extensions' is disabled in proto3 and am looking for some 
>> guidance to change the below to proto3:
>>
>>
>> ========================
>> common.proto:
>>
>> message Vehicles {
>>     extensions 1 to max
>> }
>>
>> ========================
>> car.proto:
>>
>> import "common.proto";
>>
>> message Car {
>>     string type = 1;
>>     string color = 2;
>> }
>>
>> extend Vehicles {
>>     optional Car CarExt  = 100;
>> }
>>
>> ========================
>>
>> bike.proto:
>>
>> import "common.proto";
>>
>> message Bike {
>>     string type = 1;
>>     string color = 2;
>> }
>>
>> extend Vehicles {
>>     optional Bike BikeExt = 200;
>> }
>> ========================
>>
>> Since 'optional' is default i can remove the 'optional' keyword but I am 
>> not sure how 'Any' can be used in such scenario in the place of 
>> 'extensions'.
>>
>> Thanks,
>> rc
>>
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