Method has_struct_value

libapp2sys/prebuilt/include/google/protobuf/struct.pb.h:720–722

optional .google.protobuf.Struct struct_value = 5;

// optional .google.protobuf.Struct struct_value = 5;
inline bool Value::has_struct_value() const {
  return kind_case() == kStructValue;
}
inline void Value::set_has_struct_value() {
  _oneof_case_[0] = kStructValue;
}