Question

我尝试在goggle协议缓冲区源中打印函数地址。（因为有太多的函数来自protocc生成的C ++代码中的MergePartialFromCodedStream，我想找到这个函数。）但是遇到了一个错误。来源如下。

bool InlineMergeFromCodedStream(io::CodedInputStream* input,
                                MessageLite* message) {
  GOOGLE_LOG(INFO) << "func addr = " << message->MergePartialFromCodedStream;    
              // <-- error line
  if (!message->MergePartialFromCodedStream(input)) return false;
  if (!message->IsInitialized()) {
    GOOGLE_LOG(ERROR) << InitializationErrorMessage("parse", *message);
    return false;
  }
  return true;
}

错误信息如下：

make  all-recursive
make[1]: Entering directory `/home/ckim/Neuro/py-faster-rcnn/protobuf-2.6.1'
Making all in .
make[2]: Entering directory `/home/ckim/Neuro/py-faster-rcnn/protobuf-2.6.1'
make[2]: Leaving directory `/home/ckim/Neuro/py-faster-rcnn/protobuf-2.6.1'
Making all in src
make[2]: Entering directory `/home/ckim/Neuro/py-faster-rcnn/protobuf-2.6.1/src'
depbase=`echo google/protobuf/message_lite.lo | sed 's|[^/]*$|.deps/&|;s|\.lo$||'`;\
    /bin/sh ../libtool  --tag=CXX   --mode=compile g++ -DHAVE_CONFIG_H -I. -I..    -pthread -Wall -Wwrite-strings -Woverloaded-virtual -Wno-sign-compare -O2 -g -DNDEBUG -MT google/protobuf/message_lite.lo -MD -MP -MF $depbase.Tpo -c -o google/protobuf/message_lite.lo google/protobuf/message_lite.cc &&\
    mv -f $depbase.Tpo $depbase.Plo
libtool: compile:  g++ -DHAVE_CONFIG_H -I. -I.. -pthread -Wall -Wwrite-strings -Woverloaded-virtual -Wno-sign-compare -O2 -g -DNDEBUG -MT google/protobuf/message_lite.lo -MD -MP -MF google/protobuf/.deps/message_lite.Tpo -c google/protobuf/message_lite.cc  -fPIC -DPIC -o google/protobuf/.libs/message_lite.o
google/protobuf/message_lite.cc: In function 'bool google::protobuf::<unnamed>::InlineMergeFromCodedStream(google::protobuf::io::CodedInputStream*, google::protobuf::MessageLite*)':
google/protobuf/message_lite.cc:121: error: no match for 'operator<<' in 'google::protobuf::internal::LogMessage((google::protobuf::LogLevel)0u, ((const char*)"google/protobuf/message_lite.cc"), 121).google::protobuf::internal::LogMessage::operator<<(((const char*)"test")) << message->google::protobuf::MessageLite::MergePartialFromCodedStream'
./google/protobuf/stubs/common.h:652: note: candidates are: google::protobuf::internal::LogMessage& google::protobuf::internal::LogMessage::operator<<(const std::string&)
./google/protobuf/stubs/common.h:653: note:                 google::protobuf::internal::LogMessage& google::protobuf::internal::LogMessage::operator<<(const char*)
./google/protobuf/stubs/common.h:654: note:                 google::protobuf::internal::LogMessage& google::protobuf::internal::LogMessage::operator<<(char)
./google/protobuf/stubs/common.h:655: note:                 google::protobuf::internal::LogMessage& google::protobuf::internal::LogMessage::operator<<(int)
./google/protobuf/stubs/common.h:656: note:                 google::protobuf::internal::LogMessage& google::protobuf::internal::LogMessage::operator<<(google::protobuf::uint)
./google/protobuf/stubs/common.h:657: note:                 google::protobuf::internal::LogMessage& google::protobuf::internal::LogMessage::operator<<(long int)
./google/protobuf/stubs/common.h:658: note:                 google::protobuf::internal::LogMessage& google::protobuf::internal::LogMessage::operator<<(long unsigned int)
./google/protobuf/stubs/common.h:659: note:                 google::protobuf::internal::LogMessage& google::protobuf::internal::LogMessage::operator<<(double)
make[2]: *** [google/protobuf/message_lite.lo] Error 1
make[2]: Leaving directory `/home/ckim/Neuro/py-faster-rcnn/protobuf-2.6.1/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/ckim/Neuro/py-faster-rcnn/protobuf-2.6.1'
make: *** [all] Error 2

它抱怨error: no match for 'operator<<' in ..，因为我将函数地址设置为<<。我尝试在函数地址之前添加(unsigned int)强制转换。然后我得到了

google/protobuf/message_lite.cc: In function 'bool google::protobuf::<unnamed>::InlineMergeFromCodedStream(google::protobuf::io::CodedInputStream*, google::protobuf::MessageLite*)':
google/protobuf/message_lite.cc:121: error: invalid use of member (did you forget the '&' ?)

如果我只输入一个数字而不是函数地址，则编译好。

GOOGLE_LOG在protobuf-2.6.1 / src / google / protobuf / stubs / common.h中定义，如下所示。

#define GOOGLE_LOG(LEVEL)                                                 \
  ::google::protobuf::internal::LogFinisher() =                           \
    ::google::protobuf::internal::LogMessage(                             \
      ::google::protobuf::LOGLEVEL_##LEVEL, __FILE__, __LINE__)

使用GOOGLE_LOG打印功能地址

0 个答案: