On Thu, May 19, 2016 at 10:31 AM, Alex Shaver <alexsha...@gmail.com> wrote:

> Suppose I have a message:
> message Foo{
>   oneof b_message {
>     Bar = 16;
>     Baz = 17;
>   }
> }
>
> and I have some C++ handler that is a templated function:
> template<class T>
> void b_handler(const T&);
> template void b_handler(const Bar& bar){...}
> template void b_handler(const Baz& baz){...}
>
> What I'd like to be able to do is:
> void foo_handler(const Foo& foo){
>   ...
>   b_handler(foo.b_message());
> }
>
> Essentially, if protoc generated some kind of function like
> template<class T>
> const T& Foo::b_message() const;
> const Bar& Foo::b_message() const;
> const Baz& Foo::b_message() const;
>
> that would make for automatic handling of whatever kind of b_message Foo
> had carried, rather than doing a switch(foo.b_message_case()) type decision
> tree.
>
It's pretty easy to write a protoc plugin to generate additional code. What
I don't understand though is how can you have two methods with the same
signature return different types? Is that supported by C++?


>
> I'm sure there are a lot of edge cases that I'm not thinking of, or
> cross-language considerations, but is anything like this possible?
>
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