Can I create the c++ generate class instance with default value.

[童虎]

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.

[Adam Cozzette]

With some effort you can do this using the reflection API, but if possible it would be even better to avoid using required fields.

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