I'm parsing message by runtime proto-file. I constructed "prototye
message", and tried to get reflection infos of each fields. when it comes
to nested message, I need to `AddMessage` to get the inside fields.
// proto-file
```
message A {
int32 a1 = 1;
string a2 = 2;
};
message B {
repeated A b1 = 1;
int64 b2 = 2;
};
```
```
Class ProtoType {
Message* msg;
BizX* biz_x;
void Init(const std::string& proto_file_path) {
// parse from file to get msgDesc
auto* factory = new google::protobuf::DynamicMessageFactory();
factory->SetDelegateToGeneratedFactory(true);
msg= mFactory->GetPrototype(msgDesc);
}
void InitRefl() {
biz_x = new BizX();
biz_x->Init(*(msg->New()));
}
};
```
```
class BizX {
BizY* biz_y;
Reflection* refl;
Descriptor* desc;
void Init(const Message& msg) {
refl = msg.GetReflection();
desc = msg.GetDescriptor();
const auto* field_desc = desc->FindFieldByName("b1");
auto* p = msg.New();
auto* tmp = refl->AddMessage(p, field_desc);
biz_y = new BizY();
biz_y->Init(msg);
}
};
```
```
class BizY {
Reflection* refl;
Descriptor* desc;
void Init(const Message& msg) {
refl = msg.GetReflection();
desc = msg.GetDescriptor();
const auto* field_desc = desc->FindFieldByName("b1");
auto* p = msg.New();
auto* tmp = refl->AddMessage(p, field_desc); // crash!!!:pure virtual
method called
}
};
```
```
int main() {
ProtoType* p = new ProtoType();
p->Init("proto-file")
p->InitRefl();
return 0;
}
```
I thought `BizY::Init` should have the same result as `BizX::Init`, but it
crashed, why?
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