mojo/public/bindings/generators/cpp_templates/struct_builder_definition

$CLASS::Builder::Builder(mojo::Buffer* buf)
    : data_(Data::New(buf, $DTOR)) {
}

$CLASS $CLASS::Builder::Finish() {
  Data* data = NULL;
  std::swap(data, data_);
  return mojo::internal::Wrap(data);
}