Loki/Reference/Singleton.cpp
magmaikh 82ee09b978 The Golden Code
git-svn-id: svn://svn.code.sf.net/p/loki-lib/code/trunk@31 7ec92016-0320-0410-acc4-a06ded1c099a
2002-08-11 05:49:45 +00:00

50 lines
2.1 KiB
C++

////////////////////////////////////////////////////////////////////////////////
// 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
// purpose is hereby granted without fee, provided that the above copyright
// notice appear in all copies and that both that copyright notice and this
// permission notice appear in supporting documentation.
// The author or Addison-Wesley Longman make no representations about the
// suitability of this software for any purpose. It is provided "as is"
// without express or implied warranty.
////////////////////////////////////////////////////////////////////////////////
// Last update: June 20, 2001
#include "Singleton.h"
using namespace Loki::Private;
Loki::Private::TrackerArray Loki::Private::pTrackerArray = 0;
unsigned int Loki::Private::elements = 0;
////////////////////////////////////////////////////////////////////////////////
// function AtExitFn
// Ensures proper destruction of objects with longevity
////////////////////////////////////////////////////////////////////////////////
void Loki::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, sizeof(*pTrackerArray) * --elements));
// Destroy the element
delete pTop;
}
////////////////////////////////////////////////////////////////////////////////
// Change log:
// June 20, 2001: ported by Nick Thurn to gcc 2.95.3. Kudos, Nick!!!
// January 10, 2002: Fixed bug in call to realloc - credit due to Nigel Gent and
// Eike Petersen
// May 08, 2002: Refixed bug in call to realloc
////////////////////////////////////////////////////////////////////////////////