base/Singleton.cpp

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/****************************************************************************
  Copyright (C)2001 by Andrei Alexandrescu

  This file is a derivative of a file from the Loki Library written by
  Andrei Alexandrescu.  It was distributed by him under the terms
  listed below (titled Loki Original Distribution Terms).
  In accordance with the terms, this distribution contains the copyright
  notice here and the copyright notice and permission notice
  in supporting documentation.  The terms do *not* require
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  below.  The GPL does not require you to maintain the terms of
  the Loki Original Distribution Terms, but you are encouraged to do so.

  This program/file is free software; you can redistribute it and/or modify
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 ****************************************************************************
  Loki Original Distribution Terms:

  The Loki Library
  Copyright (c) 2001 by Andrei Alexandrescu
  This code accompanies the book:
  Alexandrescu, Andrei. "Modern C++ Design: Generic Programming and Design 
      Patterns Applied". Copyright (c) 2001. Addison-Wesley.
  Permission to use, copy, modify, distribute and sell this software for any 
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 ****************************************************************************

  $Id: Singleton.cpp 1029 2004-02-11 20:45:54Z jungd $
  $Revision: 1.1 $
  $Date: 2004-02-11 15:45:54 -0500 (Wed, 11 Feb 2004) $
  $Author: jungd $
 
****************************************************************************/

// Last update: June 20, 2001

#include <base/Singleton>

using namespace base::Private;

base::Private::TrackerArray base::Private::pTrackerArray = 0;
unsigned int base::Private::elements = 0;

////////////////////////////////////////////////////////////////////////////////
// function AtExitFn
// Ensures proper destruction of objects with longevity
////////////////////////////////////////////////////////////////////////////////

void base::Private::AtExitFn()
{
    assert(elements > 0 && pTrackerArray != 0);
    // Pick the element at the top of the stack
    LifetimeTracker* pTop = pTrackerArray[elements - 1];
    // Remove that object off the stack
    // Don't check errors - realloc with less memory 
    //     can't fail
    pTrackerArray = static_cast<TrackerArray>(std::realloc(
        pTrackerArray, --elements));
    // Destroy the element
    delete pTop;
}

////////////////////////////////////////////////////////////////////////////////
// Change log:
// June 20, 2001: ported by Nick Thurn to gcc 2.95.3. Kudos, Nick!!!
// Feb 25, 2002: David Jung: integrated into larger project - changed to 
//                namespace base and changed header comments to reflect GPL
//                distribution
////////////////////////////////////////////////////////////////////////////////

---