Set all fields of nested message in protobuf c++

[Gaurav Bhosale]

I have proto file ( target for C++ )
message Test1
{
message Test2
{
required double x = 1;
}
required double y = 1;

}

I want initialize Test1 message without using mutable_****
Or
Without using set fields function in C++

Means, is it possible that,

Test1 test_message;
test_message = new Test1();

and all fields initialized to zero or default value?
Is there any single function, which will do initialize all fields of nested message in C++?

[Adam Cozzette]

With some work you can implement this functionality using protobuf reflection. However I would strongly recommend against using required fields at all, if you can avoid them. Changing an existing field from required to optional is dangerous, but it's a good idea to avoid required fields from the start when creating new message types.

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[Gaurav Bhosale]

Yes. I an able to do that with reflection but I want to initialize all fields to zero without reflection.
Is that possible?
So idea is to access all fields if Test1 message.
Currently, when I do

Test1 test_message;
test_message = new Test1();

I am not able to access its fields x and so on.
I wanted to ask all fields after memory allocation.

[Adam Cozzette]

There is no way to do this without using reflection or the generated accessors (i.e. set_* and mutable_*).

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[Gaurav Bhosale]

Okay. Thanks for your feedback.