C++ Backtrace::ToString方法代码示例

void Log::Assert(bool condition, const std::string& message)
{
  if (!condition)
  {
#ifdef HAS_BFD_DL
    Backtrace bt;

    Log::Debug << bt.ToString();
#endif
    Log::Debug << message << std::endl;

    throw std::runtime_error("Log::Assert() failed: " + message);
  }
}

typename std::enable_if<!arma::is_arma_type<T>::value>::type
PrefixedOutStream::BaseLogic(const T& val)
{
  // We will use this to track whether or not we need to terminate at the end of
  // this call (only for streams which terminate after a newline).
  bool newlined = false;
  std::string line;

  // If we need to, output the prefix.
  PrefixIfNeeded();

  std::ostringstream convert;
  // Sync flags and precision with destination stream
  convert.setf(destination.flags());
  convert.precision(destination.precision());
  convert << val;

  if (convert.fail())
  {
    PrefixIfNeeded();
    if (!ignoreInput)
    {
      destination << "Failed type conversion to string for output; output not "
          "shown." << std::endl;
      newlined = true;
    }
  }
  else
  {
    line = convert.str();

    // If the length of the casted thing was 0, it may have been a stream
    // manipulator, so send it directly to the stream and don't ask questions.
    if (line.length() == 0)
    {
      // The prefix cannot be necessary at this point.
      if (!ignoreInput) // Only if the user wants it.
        destination << val;

      return;
    }

    // Now, we need to check for newlines in the output and print it.
    size_t nl;
    size_t pos = 0;
    while ((nl = line.find('\n', pos)) != std::string::npos)
    {
      PrefixIfNeeded();

      // Only output if the user wants it.
      if (!ignoreInput)
      {
        destination << line.substr(pos, nl - pos);
        destination << std::endl;
      }

      newlined = true; // Ensure this is set for the fatal exception if needed.
      carriageReturned = true; // Regardless of whether or not we display it.

      pos = nl + 1;
    }

    if (pos != line.length()) // We need to display the rest.
    {
      PrefixIfNeeded();
      if (!ignoreInput)
        destination << line.substr(pos);
    }
  }

  // If we displayed a newline and we need to throw afterwards, do that.
  if (fatal && newlined)
  {
    if (!ignoreInput)
      destination << std::endl;

    // Print a backtrace, if we can.
#ifdef HAS_BFD_DL
    if (fatal && !ignoreInput && backtrace)
    {
      size_t nl;
      size_t pos = 0;

      Backtrace bt;
      std::string btLine = bt.ToString();
      while ((nl = btLine.find('\n', pos)) != std::string::npos)
      {
        PrefixIfNeeded();

        if (!ignoreInput)
        {
          destination << btLine.substr(pos, nl - pos);
          destination << std::endl;
        }

        carriageReturned = true; // Regardless of whether or not we display it.

        pos = nl + 1;
      }
    }
//.........这里部分代码省略.........

void PrefixedOutStream::BaseLogic(const T& val)
{
  // We will use this to track whether or not we need to terminate at the end of
  // this call (only for streams which terminate after a newline).
  bool newlined = false;
  std::string line;

  // If we need to, output the prefix.
  PrefixIfNeeded();

  std::ostringstream convert;
  convert << val;

  if (convert.fail())
  {
    PrefixIfNeeded();
    if (!ignoreInput)
    {
      destination << "Failed lexical_cast<std::string>(T) for output; output"
          " not shown." << std::endl;
      newlined = true;
    }
  }
  else
  {
    line = convert.str();

    // If the length of the casted thing was 0, it may have been a stream
    // manipulator, so send it directly to the stream and don't ask questions.
    if (line.length() == 0)
    {
      // The prefix cannot be necessary at this point.
      if (!ignoreInput) // Only if the user wants it.
        destination << val;

      return;
    }

    // Now, we need to check for newlines in retrieved backtrace.
    //If we find one, output up until the newline, then output the newline
    //and the prefix and continue looking.
    size_t nl;
    size_t pos = 0;
#ifdef HAS_BFD_DL
      if(fatal)
      {
	Backtrace bt;
	std::string btLine = bt.ToString();
	while ((nl = btLine.find('\n', pos)) != std::string::npos)
	{
	  PrefixIfNeeded();
	  
	  destination << btLine.substr(pos, nl - pos);
	  destination << std::endl;
	  newlined = true;
	    
	  carriageReturned = true; // Regardless of whether or not we display it.
      
	  pos = nl + 1;
	}
	pos = 0;
      }
#endif
    //The same logic like above, but this time for 'line'.
    while ((nl = line.find('\n', pos)) != std::string::npos)
    {
      PrefixIfNeeded();

      // Only output if the user wants it.
      if (!ignoreInput)
      {
        destination << line.substr(pos, nl - pos);
        destination << std::endl;
        newlined = true;
      }

      carriageReturned = true; // Regardless of whether or not we display it.

      pos = nl + 1;
    }

    if (pos != line.length()) // We need to display the rest.
    {
      PrefixIfNeeded();
      if (!ignoreInput)
        destination << line.substr(pos);
    }
  }

  // If we displayed a newline and we need to throw afterwards, do that.
  if (fatal && newlined)
  {
    std::cout << std::endl;
    throw std::runtime_error("fatal error; see Log::Fatal output");
  }
}