LogSingleton.h

   1 /*
   2  * Copyright (c) 2002, Robert Collins..
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     A copy of the GNU General Public License can be found at
  10  *     http://www.gnu.org/
  11  *
  12  * Written by Robert Collins <rbtcollins@hotmail.com>
  13  *
  14  */
  15
  16 #ifndef SETUP_LOGSINGLETON_H
  17 #define SETUP_LOGSINGLETON_H
  18
  19 #include <iostream>
  20
  21 enum log_level {
  22   LOG_PLAIN = 2,
  23   LOG_BABBLE = 1,
  24   LOG_TIMESTAMP = 2
  25 };
  26
  27 // Logging class. Default logging level is PLAIN.
  28 class LogSingleton : public std::ostream
  29 {
  30 public:
  31   // Singleton support
  32   static LogSingleton &GetInstance();
  33   static void SetInstance(LogSingleton &anInstance);
  34
  35   /* Some platforms don't call destructors. So this call exists
  36    * which guarantees to flush any log data...
  37    * but doesn't call generic C++ destructors
  38    */
  39   __attribute__ ((noreturn)) virtual void exit (int, bool = true) = 0;
  40   virtual ~LogSingleton();
  41   // get a specific verbosity stream.
  42   virtual std::ostream &operator() (enum log_level level) = 0;
  43
  44   friend std::ostream& endLog(std::ostream& outs);
  45
  46 protected:
  47   LogSingleton(std::streambuf* aStream); // Only child classs can be created.
  48   LogSingleton (LogSingleton const &); // no copy constructor
  49   LogSingleton &operator = (LogSingleton const&); // no assignment operator
  50   virtual void endEntry() = 0; // the current in-progress entry is complete.
  51 private:
  52   static LogSingleton *theInstance;
  53 };
  54
  55 /* End of a Log comment */
  56 extern std::ostream& endLog(std::ostream& outs);
  57
  58 #define Log(X) (LogSingleton::GetInstance ()(X))
  59
  60 // Log adapators for printf-style output
  61 void LogBabblePrintf(const char *fmt, ...);
  62 void LogPlainPrintf(const char *fmt, ...);
  63
  64 #endif /* SETUP_LOGSINGLETON_H */