LogSingleton.cc

   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 #include "LogSingleton.h"
  17 #include <stdexcept>
  18
  19 /* Helper functions */
  20
  21 /* End of a Log comment */
  22 ostream& endLog(ostream& outs)
  23 {
  24   /* Doesn't seem to be any way around this */
  25   dynamic_cast<LogSingleton &>(outs).endEntry();
  26   return outs;
  27 }
  28
  29 /* The LogSingleton class */
  30
  31 LogSingleton * LogSingleton::theInstance(0);
  32
  33 LogSingleton::LogSingleton(){}
  34 LogSingleton::~LogSingleton(){}
  35
  36 LogSingleton &
  37 LogSingleton::GetInstance()
  38 {
  39   if (!theInstance)
  40     throw new invalid_argument ("No instance has been set!");
  41   return *theInstance;
  42 }
  43
  44 void
  45 LogSingleton::SetInstance(LogSingleton &newInstance)
  46 {
  47   theInstance = &newInstance;
  48 }
  49
  50 #if 0
  51 // Logging class. Default logging level is PLAIN.
  52 class LogSingleton : public ostream
  53 {
  54 public:
  55   // Singleton support
  56   /* Some platforms don't call destructors. So this call exists
  57    * which guarantees to flush any log data...
  58    * but doesn't call generic C++ destructors
  59    */
  60   virtual void exit (int const exit_code) __attribute__ ((noreturn));
  61   // get a specific verbosity stream.
  62   virtual ostream &operator() (enum log_level level);
  63
  64   friend ostream& endLog(ostream& outs);
  65
  66 protected:
  67   LogSingleton (LogSingleton const &); // no copy constructor
  68   LogSingleton &operator = (LogSingleton const&); // no assignment operator
  69   void endEntry(); // the current in-progress entry is complete.
  70 private:
  71   static LogSingleton *theInstance;
  72 };
  73 #endif