错误：当调用协议缓冲区方法时，2个重载对此指针没有合法转换

Question

在以下代码中调用C2663: MediaSetting::mutable_mediamessage: 2 overloads have no legal conversion for this pointer时，有人可以帮我解决此错误mutable_mediamessage()。

class MediaSetting : public ::google::protobuf::Message {
 public:
  inline ::MSG::MediaMessage* mutable_mediamessage(int index);
  inline ::google::protobuf::RepeatedPtrField< ::MSG::MediaMessage >* mutable_mediamessage();
}

inline ::MSG::MediaMessage* MediaSetting::mutable_mediamessage(int index) {
  return mediamessage_.Mutable(index);
}

inline ::google::protobuf::RepeatedPtrField< ::MSG::MediaMessage >*
MediaSetting::mutable_mediamessage() {
  return &mediamessage_;
}

// my test codes
// ...
const ::MSG::MediaSetting& media = config.mediasetting();
::google::protobuf::RepeatedPtrField<::MSG::MediaMessage>* pmedia = media.mutable_mediamessage(); // Error C2663 is here

环境：VS2008

Answer 1

您正尝试通过const引用访问非const成员函数。