On Jan 9, 1:32 am, chongyc <chongy...@gmail.com> wrote:
> I defined proto by following .
>
> message Ch {
> required int32 offset = 1;
>
> }
>
> message Foo {
> required string cmd = 1;
>
> extensions 1000 to max;
>
> }
>
> message Bar {
> extend Foo {
> required Ch ck = 1000;
> }
>
> }
>
> Then I generated c++ code from it.
> It's OK
>
> I am going to set value to extension ck()
> I compiled c++ source following below.
>
> term2relay::Foo f;
> term2relay::Bar b;
> term2relay::Ch c;
>
> c.set_offset (100);
>
> f.SetExtension(Bar::ck, c);
>
> But compiling failed in source code line
> f.SetExtension(Bar::ck, c);
>
> How to do it ?
>
> Please help me.
You don't need to create a Ch instance yourself - it's done for you
when you create a new Foo instance, which is analogous to the same
situation without extensions, but in this case, you need to get a
mutable pointer to your Ch instance. Try this:
term2relay::Foo f;
term2relay::Ch* c = f.MutableExtension(Bar::ck);
c->set_offset(100);
You also need to change ck's label to 'optional'; otherwise you get an
assertion error. Kenton, do all composite fields in extensions have
to be optional? If so, can we document this?
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