Some questions about qdebug, a custom debug and const approach

[tonnot]

Thanks high_flyer (but I dont understand you)
This is my function (for strings):

W_debug& W_debug::operator << (const char * data) {
    if (strcmp (data,"")==0)
    {     switch (log_file_mode)
          {
          case 0:
              qDebug()<<QString().fromStdString(os.str());
              break;
          case 1:
              log_file->write(os.str());
              break;
          case 2:
              my_window->add(os.str());  // another custom class
              break;
      }
      os.clear();  os.str("");
    }
    else
    { os<<data;  return *this;  }      // os is a std::stream
}

W_debug& W_debug::operator << (const char * data) {
    if (strcmp (data,"")==0)
    {     switch (log_file_mode)
          {
          case 0:
              qDebug()<<QString().fromStdString(os.str());
              break;
          case 1:
              log_file->write(os.str());
              break;
          case 2:
              my_window->add(os.str());  // another custom class
              break;
      }
      os.clear();  os.str("");
    }
    else
    { os<<data;  return *this;  }      // os is a std::stream
}

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As you can see I use "" detection to resolve that the user has ended the call.
If not, I cannot to have more than one message per line.
(because, regardless the 'log_mode' method I use, every << will emit the result )
So the question are unresolved, (or I dont understand your explanation) :
If I have w_debug()<<"a word"<< data1<<"a word"<< data2;
How can I know the end of << feeding .,

Thanks


Mcosta : thanks, but I need more control over the messages and QtGlobal::qInstallMsgHandler() perhaps is useful, but I want to develop my own 'w_debug'.