I have a protobuf like this:
```
syntax = "proto2";
message Foo {
required int foo1 = 1;
required int foo2 = 2;
...
required int foo20 = 20;
}
```
When I use the generated Foo class in c++. I want to create a instance
serialized it. Looks like this:
```
Foo foo;
foo.set_foo1(1);
// What I want is ommit the others with them default value.
string fb;
foo.SerializeToString(&pb);
```
But at runtime, this will throw exception says "The foo2...foo20" is not
setted.
What I want is default value 0. Setting them seems like boring
Can I do this. My english is poor, If you can't understand me, please let
me know. Thank you.
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