////////////////////////////////////////////////////////////////////////////////
// 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.
// Code covered by the MIT License
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
////////////////////////////////////////////////////////////////////////////////

// $Id$


#include <loki/Singleton.h>


#ifdef LOKI_ENABLE_NEW_SETLONGLIVITY_HELPER_DATA_IMPL
Loki::Private::TrackerArray* Loki::Private::pTrackerArray = 0;
#else
Loki::Private::TrackerArray Loki::Private::pTrackerArray = 0;
unsigned int Loki::Private::elements = 0;
#endif

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

#ifdef LOKI_ENABLE_NEW_SETLONGLIVITY_HELPER_DATA_IMPL

void LOKI_C_CALLING_CONVENTION_QUALIFIER Loki::Private::AtExitFn()
{
    assert(pTrackerArray!=0 && !pTrackerArray->empty());

    // Pick the element at the top of the stack
    LifetimeTracker* pTop = pTrackerArray->back();

    // Remove that object off the stack _before_ deleting pTop
    pTrackerArray->pop_back();

    // Destroy the element
    delete pTop;

    // Destroy stack when it's empty _after_ deleting pTop
    if(pTrackerArray->empty())
    {
        delete pTrackerArray;
        pTrackerArray = 0;
    }
}

#else

void LOKI_C_CALLING_CONVENTION_QUALIFIER 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;
}

#endif