Hi protobuf experts,
Let's say I have a message defined like this:
message Foo {
// ...
extensions 100 to 199;
}
Given an instance foo of Foo (or any message really), I was wondering if there
was a straightforward elegant way to test if any extensions had been set rather
than do this (WARNING: i'm not sure this code compiles...):
bool HasExtensions(const proto2::Message& msg) {
const proto2::Reflection* reflection = msg.GetReflection(); vector<const
proto2::FieldDescriptor*> fields; reflection->ListFields(msg, &fields); for
(auto field : fields) { if (field->is_extension()) {
return true;
}
}
return false;
}
if (!HasExtensions(foo)) {
...
}
Thanks much,
Julien.
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