Class LogMessageData

base/src/main/cpp/logging.cpp:188–221

This indirection greatly reduces the stack impact of having lots of checks/logging in a function.

// This indirection greatly reduces the stack impact of having lots of
// checks/logging in a function.
class LogMessageData {
 public:
  LogMessageData(const char* file, unsigned int line, LogSeverity severity,
                 const char* tag, int error)
      : file_(GetFileBasename(file)),
        line_number_(line),
        severity_(severity),
        tag_(tag),
        error_(error) {}

  DISALLOW_COPY_AND_ASSIGN(LogMessageData);

  const char* GetFile() const { return file_; }

  unsigned int GetLineNumber() const { return line_number_; }

  LogSeverity GetSeverity() const { return severity_; }

  const char* GetTag() const { return tag_; }

  int GetError() const { return error_; }

  std::ostream& GetBuffer() { return buffer_; }

  std::string ToString() const { return buffer_.str(); }

 private:
  std::ostringstream buffer_;
  const char* const file_;
  const unsigned int line_number_;
  const LogSeverity severity_;
  const char* const tag_;
  const int error_;
};

LogMessage::LogMessage(const char* file, unsigned int line, LogId,
                       LogSeverity severity, const char* tag, int error)