/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/
/*****************************************************************************
*
*   $/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtSpareList.h
*   
***/

#ifdef PLASMA20_SOURCES_PLASMA_NUCLEUSLIB_PNUTILS_PRIVATE_PNUTSPARELIST_H
#error "Header $/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtSpareList.h included more than once"
#endif
#define PLASMA20_SOURCES_PLASMA_NUCLEUSLIB_PNUTILS_PRIVATE_PNUTSPARELIST_H



#ifdef HS_DEBUGGING
#define SPARELIST_TRACK_MEMORY
#endif


/****************************************************************************
*
*   CBaseSpareList
*
***/

class CBaseSpareList {
public:
    CBaseSpareList ();

protected:
    struct SpareNode {
        SpareNode * spareNext;
    };
    SpareNode * m_spareHead;

    void * Alloc (unsigned objectSize, const char typeName[]);
    void CleanUp (const char typeName[]);
    void Free (void * object, unsigned objectSize);

private:
    union AllocNode {
        AllocNode * allocNext;
        qword       align;
    };
    AllocNode * m_allocHead;
    unsigned    m_chunkSize;

    #ifdef SPARELIST_TRACK_MEMORY
    unsigned m_unfreedObjects;
    #endif

    void GrowSpareList (unsigned objectSize, const char typeName[]);
};


/****************************************************************************
*
*   TSpareList
*
***/

template<class T>
class TSpareList : public CBaseSpareList {
private:
    enum { OBJECT_SIZE = MAX(sizeof(T), sizeof(SpareNode)) };

public:
    ~TSpareList () { CleanUp(); }

    void * Alloc ();
    void   CleanUp ();
    void   Delete (T * node);
    void   Free (T * node);
    T *    New ();
};


//===========================================================================
template<class T>
void * TSpareList<T>::Alloc () {
    return CBaseSpareList::Alloc(OBJECT_SIZE, typeid(T).name());
}

//===========================================================================
template<class T>
void TSpareList<T>::CleanUp () {
    CBaseSpareList::CleanUp(typeid(T).name());
}

//===========================================================================
template<class T>
void TSpareList<T>::Delete (T * node) {
    node->~T();
    CBaseSpareList::Free(node, OBJECT_SIZE);
}

//===========================================================================
template<class T>
void TSpareList<T>::Free (T * node) {
    CBaseSpareList::Free(node, OBJECT_SIZE);
}

//===========================================================================
template<class T>
T * TSpareList<T>::New () {
    return new(CBaseSpareList::Alloc(OBJECT_SIZE, typeid(T).name())) T;
}