[protobuf] How to get a field object using name in proto3 like MutableExtension

[Mihir Thakkar]

Hello everyone,

Intro: My company is in the process of migrating schemas from proto2 to 
proto3. I am eliminating extensions as they are not supported. 

Question: I am wondering if it is possible to get a field object using it's 
name.

Example: In proto2, my current code looks like this:

*> Foo.proto*
message Foo {
message Bar {
unint32 a = 1;
}
extend Foo {
Bar b = 1;
}
}

*> in C++*
*Foo::Bar b_val = foo.MutableExtension(Foo::b);*

Now in proto3, I could do this:

*> Foo.proto*
syntax="proto3";
message Foo {
message Bar {
unint32 a = 1;
}
Bar b = 1;
}

*> in C++*
*Foo::Bar b_val = foo.mutable_b();*

However, I want to use the name Foo::b to get a Foo::Bar object. Is there a 
way to do this? If there is, which one is recommended?

Thanks,
Mihir

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Re: [protobuf] can protobuf3 be used with protobuf2?

[Mihir Thakkar]

I am trying to use proto2 on client-side and proto3 on server-side. My 
schema files use extensions, and I am assuming this is still true so I 
cannot do it?
Can anybody confirm?

On Thursday, April 28, 2016 at 6:18:12 PM UTC-4, Feng Xiao wrote:
>
>
>
> On Tue, Apr 26, 2016 at 7:04 PM, Bo Gao > 
> wrote:
>
>> suppose server side is updating into protobuf3, but client side still use 
>> protobuf2, can then communicate will?
>>
> Yes, as long as you only use proto3 features, they are wire compatible.
>  
>
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