Four Memory Errors found using Purify Version 7.0 ("Build 7076") on Windows XP
(machine: Wesel)in the course of the development of the Accounting Workspace Qt4 Port.

This was with a modified version of the Accounting Class "chapter 7" model, with 
all series data truncated (to one or two timesteps).  The test sequence was: 
   (1) Swap the positions of two Account Items in a SimObj Region,
   (2) Delete one of those  Accounts, and 
   (3) Reload the model.

The original model load takes a long time (overnight), but the memory errors and 
subsequent crash occurs very soon after starting the reload, during the clearing 
of Account and Supply Display Groups.

ERROR 1: IPR: Invalid pointer read in Account::getSimObj(void)const {1 occurrence} (Clearing Account Groups)
ERROR 2: IPR: Invalid pointer read in Account::getSimObj(void)const {1 occurrence} (Clearing Supply Groups)
ERROR 3: FMR: Free memory read in FindCompleteObject {1 occurrence} (Dynamic Casting of a LinkGfxItem)
ERROR 4: IPR: Invalid pointer read in FindCompleteObject {1 occurrence} (Dynamic Casting of a LinkGfxItem)

See "OVERVIEWS" and "DETAILS" for each of these four errors, below.

Purify Run Summary:
  Displayed Errors: 4 of 4

  Displayed Warnings: 20154398 of 20308693 
   (Virtually all UMR's in Qt, esp. QString and QEvent)

  Bytes Leaked: 789365+490240.
   (Note: much of this is probably for static data, not really needing to be freed).

[Phil Weinstein, 12-08-2010, RiverWare 6.1 Development].

=========================================================================

----------------
ERROR 1 OVERVIEW
----------------

[E] IPR: Invalid pointer read in Account::getSimObj(void)const {1 occurrence}
        Reading 4 bytes from 0x1661cd1c (4 bytes at 0x1661cd1c illegal)
        Address 0x1661cd1c points into a committed region of virtual memory 
        Thread ID: 0xd40
        Error location
            Account::getSimObj(void)const [c:\riverware\staff\philw\dev1\accounting\account.hpp:815]
            CallbackReceiver::_helpAccountCallbacks(CallbackType,bool,RootSelection const*) [c:\riverware\staff\philw\dev1\sim\callbackreceiver.cpp:438]
            CallbackReceiver::_removeAccountCallbacks(CallbackType,RootSelection const*) [c:\riverware\staff\philw\dev1\sim\callbackreceiver.cpp:457]
            AccountGroup::_removeCallbacks(void) [c:\riverware\staff\philw\dev1\sim\accountgroup.cpp:164]
            AccountGroup::~AccountGroup(void) [c:\riverware\staff\philw\dev1\sim\accountgroup.cpp:169]
            AccountGroup::`scalar deleting destructor'(UINT) [C:\RiverWare\staff\philw\dev1\EngrObjs\Debug\riverware.exe]
            RootGroupMgr::clearGroups(void) [c:\riverware\staff\philw\dev1\sim\rootgroupmgr.cpp:726]
            SimWorkspace::clear(bool) [c:\riverware\staff\philw\dev1\sim\simws.cpp:571]
            LoadSaveMgr::doLoadModelFile(int,QString const*) [c:\riverware\staff\philw\dev1\q3gui\loadsavemgr.cpp:1283]
            LoadSaveMgr::loadSaveCmd(int,QString const*) [c:\riverware\staff\philw\dev1\q3gui\loadsavemgr.cpp:2016]

--------------
ERROR 1 DETAIL
--------------

[E] IPR: Invalid pointer read in Account::getSimObj(void)const {1 occurrence}
    Reading 4 bytes from 0x1661cd1c (4 bytes at 0x1661cd1c illegal)
    Address 0x1661cd1c points into a committed region of virtual memory 
    Thread ID: 0xd40
    Error location
    Account::getSimObj(void)const [c:\riverware\staff\philw\dev1\accounting\account.hpp:815]
    
    inline SimObj *Account::getSimObj() const
    {
 =>     return _simobj;
    }
    
    // set and return the account name
    CallbackReceiver::_helpAccountCallbacks(CallbackType,bool,RootSelection const*) [c:\riverware\staff\philw\dev1\sim\callbackreceiver.cpp:438]
                Account *account = sel1.elem(iter);
                // Put the SIMOBJ_ACCOUNT_DELETED callback on the
                    // containing simobj. But don't do any duplicates.
     =>             SimObj *container = account->getSimObj();
                    rwAssert(container);
                    if(add) {
                        _addCxxCallback(container, t,
    CallbackReceiver::_removeAccountCallbacks(CallbackType,RootSelection const*) [c:\riverware\staff\philw\dev1\sim\callbackreceiver.cpp:457]
        void CallbackReceiver::_removeAccountCallbacks(CallbackType t,
            const RootSelection *slx)
        {
     =>     _helpAccountCallbacks(t, false, slx);
        }
        
        void CallbackReceiver::_helpSupplyCallbacks(CallbackType t,
    AccountGroup::_removeCallbacks(void) [c:\riverware\staff\philw\dev1\sim\accountgroup.cpp:164]
            recomputeSelections(false); // false-->don't update the callbacks as
                    // that would put us into an infinite loop
            CallbackReceiver::_removeSimObjCallbacks(WS_OBJECT_REMOVED, selection1());
     =>     CallbackReceiver::_removeAccountCallbacks(SIMOBJ_ACCOUNT_DELETED, selection1());
        }
        
        AccountGroup::~AccountGroup()
    AccountGroup::~AccountGroup(void) [c:\riverware\staff\philw\dev1\sim\accountgroup.cpp:169]
        
        AccountGroup::~AccountGroup()
        {
     =>     _removeCallbacks();
        }
        
        const cwSlist<const Account *> & AccountGroup::resolve(bool force)
    AccountGroup::`scalar deleting destructor'(UINT) [C:\RiverWare\staff\philw\dev1\EngrObjs\Debug\riverware.exe]
    RootGroupMgr::clearGroups(void) [c:\riverware\staff\philw\dev1\sim\rootgroupmgr.cpp:726]
                    list.replace(it,NULL);
                    g->unresolve();
                    // delete the group.
     =>             delete g;
                }
                list.clear();
             }
    SimWorkspace::clear(bool) [c:\riverware\staff\philw\dev1\sim\simws.cpp:571]
            POST(WSID_MGMT)(WSID_MGMT, MSG_WS_CLEAR );
        
            callbackReceiverMgr.setClearingWS(true);
     =>     RootGroupMgr::Instance()->clearGroups();
        
            rwSystem->callCallbacks(WS_CLEARING);
        
    LoadSaveMgr::doLoadModelFile(int,QString const*) [c:\riverware\staff\philw\dev1\q3gui\loadsavemgr.cpp:1283]
    LoadSaveMgr::loadSaveCmd(int,QString const*) [c:\riverware\staff\philw\dev1\q3gui\loadsavemgr.cpp:2016]

=========================================================================

----------------
ERROR 2 OVERVIEW
----------------


[E] IPR: Invalid pointer read in Account::getSimObj(void)const {1 occurrence}
        Reading 4 bytes from 0x1661cd1c (4 bytes at 0x1661cd1c illegal)
        Address 0x1661cd1c points into a committed region of virtual memory 
        Thread ID: 0xd40
        Error location
            Account::getSimObj(void)const [c:\riverware\staff\philw\dev1\accounting\account.hpp:815]
            CallbackReceiver::_helpAccountCallbacks(CallbackType,bool,RootSelection const*) [c:\riverware\staff\philw\dev1\sim\callbackreceiver.cpp:438]
            CallbackReceiver::_removeAccountCallbacks(CallbackType,RootSelection const*) [c:\riverware\staff\philw\dev1\sim\callbackreceiver.cpp:457]
            SupplyGroup::_removeCallbacks(void) [c:\riverware\staff\philw\dev1\sim\supplygroup.cpp:182]
            SupplyGroup::~SupplyGroup(void) [c:\riverware\staff\philw\dev1\sim\supplygroup.cpp:191]
            SupplyGroup::`scalar deleting destructor'(UINT) [C:\RiverWare\staff\philw\dev1\EngrObjs\Debug\riverware.exe]
            RootGroupMgr::clearGroups(void) [c:\riverware\staff\philw\dev1\sim\rootgroupmgr.cpp:750]
            SimWorkspace::clear(bool) [c:\riverware\staff\philw\dev1\sim\simws.cpp:571]
            LoadSaveMgr::doLoadModelFile(int,QString const*) [c:\riverware\staff\philw\dev1\q3gui\loadsavemgr.cpp:1283]
            LoadSaveMgr::loadSaveCmd(int,QString const*) [c:\riverware\staff\philw\dev1\q3gui\loadsavemgr.cpp:2016]

--------------
ERROR 2 DETAIL
--------------

[E] IPR: Invalid pointer read in Account::getSimObj(void)const {1 occurrence}
    Reading 4 bytes from 0x1661cd1c (4 bytes at 0x1661cd1c illegal)
    Address 0x1661cd1c points into a committed region of virtual memory 
    Thread ID: 0xd40
    Error location
    Account::getSimObj(void)const [c:\riverware\staff\philw\dev1\accounting\account.hpp:815]
    
    inline SimObj *Account::getSimObj() const
    {
 =>     return _simobj;
    }
    
    // set and return the account name
    CallbackReceiver::_helpAccountCallbacks(CallbackType,bool,RootSelection const*) [c:\riverware\staff\philw\dev1\sim\callbackreceiver.cpp:438]
                Account *account = sel1.elem(iter);
                // Put the SIMOBJ_ACCOUNT_DELETED callback on the
                // containing simobj. But don't do any duplicates.
 =>             SimObj *container = account->getSimObj();
                rwAssert(container);
                if(add) {
                    _addCxxCallback(container, t,
    CallbackReceiver::_removeAccountCallbacks(CallbackType,RootSelection const*) [c:\riverware\staff\philw\dev1\sim\callbackreceiver.cpp:457]
    void CallbackReceiver::_removeAccountCallbacks(CallbackType t,
        const RootSelection *slx)
    {
 =>     _helpAccountCallbacks(t, false, slx);
    }
    
    void CallbackReceiver::_helpSupplyCallbacks(CallbackType t,
    SupplyGroup::_removeCallbacks(void) [c:\riverware\staff\philw\dev1\sim\supplygroup.cpp:182]
        recomputeSelections(false); // don't update the callbacks as
                // that would put us into an infinite loop
        CallbackReceiver::_removeSimObjCallbacks(WS_OBJECT_REMOVED, selection1());
 =>     CallbackReceiver::_removeAccountCallbacks(SIMOBJ_ACCOUNT_DELETED, selection1());
            CallbackReceiver::_removeSupplyCallbacks(ACCOUNT_CHANGED, selection1());
            CallbackReceiver::_removeExchangePaybackCallbacks(ANY_CALLBACK_TYPE,
                selection1());
    SupplyGroup::~SupplyGroup(void) [c:\riverware\staff\philw\dev1\sim\supplygroup.cpp:191]
        // Not virtual because there are no virtual funcs here.
        SupplyGroup::~SupplyGroup()
        {
     =>     _removeCallbacks();
        }
        
        const cwSlist<const Supply *> & SupplyGroup::resolve(bool force)
    SupplyGroup::`scalar deleting destructor'(UINT) [C:\RiverWare\staff\philw\dev1\EngrObjs\Debug\riverware.exe]
    RootGroupMgr::clearGroups(void) [c:\riverware\staff\philw\dev1\sim\rootgroupmgr.cpp:750]
                    list.replace(it,NULL);
                    g->unresolve();
                    // delete the group.
     =>             delete g;
                }
                list.clear();
             }
    SimWorkspace::clear(bool) [c:\riverware\staff\philw\dev1\sim\simws.cpp:571]
            POST(WSID_MGMT)(WSID_MGMT, MSG_WS_CLEAR );
        
            callbackReceiverMgr.setClearingWS(true);
     =>     RootGroupMgr::Instance()->clearGroups();
        
            rwSystem->callCallbacks(WS_CLEARING);
        
    LoadSaveMgr::doLoadModelFile(int,QString const*) [c:\riverware\staff\philw\dev1\q3gui\loadsavemgr.cpp:1283]
           // workspace and load the new model.
           if (okStatus)
           {
     =>        rwWorkspace->clear();
               okStatus = loadModelFile(qPrintable(fname));
           }
        
    LoadSaveMgr::loadSaveCmd(int,QString const*) [c:\riverware\staff\philw\dev1\q3gui\loadsavemgr.cpp:2016]


=========================================================================

----------------
ERROR 3 OVERVIEW
----------------

[E] FMR: Free memory read in FindCompleteObject {1 occurrence}
        Reading 4 bytes from 0x167fd3b8 (4 bytes at 0x167fd3b8 illegal)
        Address 0x167fd3b8 is at the beginning of a 40 byte block
        Address 0x167fd3b8 points to a C++ new block in heap 0x0eb40000
        Thread ID: 0xd40
        Error location
            FindCompleteObject [f:\dd\vctools\crt_bld\self_x86\crt\prebuild\eh\rtti.cpp:358]
            _RTDynamicCast [f:\dd\vctools\crt_bld\self_x86\crt\prebuild\eh\rtti.cpp:256]
            WorkspaceGfxScene::clearLinkAndSupplyItems(void) [c:\riverware\staff\philw\dev1\qtutils\workspacegfxscene.cpp:1449]
            WorkspaceGfxScene::clearAllItems(void) [c:\riverware\staff\philw\dev1\qtutils\workspacegfxscene.cpp:301]
            CanvasRef::clear(void)const [c:\riverware\staff\philw\dev1\q3gui\canvasref.cpp:270]
            Workspace::clear(void) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:2359]
            Workspace::callbackHandler(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:5749]
            Workspace_allCallbacksCBNoteProc(Callback *,CallbackType,CallbackData *,void *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:5662]
            FunctionCb::invoke(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\sim\functioncb.cpp:13]
            Root::callCallbacks(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\sim\root.cpp:222]
        Allocation location
            new(UINT)      [C:\RiverWare\staff\philw\dev1\EngrObjs\Debug\riverware.exe]
            SupplyGfxItem::SupplyGfxItem(Supply *,AccountGfxItem *,AccountGfxItem *,WorkspaceGfxScene *) [c:\riverware\staff\philw\dev1\qtutils\supplygfxitem.cpp:112]
            WorkspaceGfxScene::addSupplyItem(Supply *) [c:\riverware\staff\philw\dev1\qtutils\workspacegfxscene.cpp:1744]
            CanvasRef::addSupply(Supply *)const [c:\riverware\staff\philw\dev1\q3gui\canvasref.cpp:355]
            Workspace::addSupply(Supply *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:2664]
            Workspace::callbackHandler(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:5884]
            Workspace_allCallbacksCBNoteProc(Callback *,CallbackType,CallbackData *,void *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:5662]
            FunctionCb::invoke(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\sim\functioncb.cpp:13]
            Root::callCallbacks(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\sim\root.cpp:222]
            AccountMgr::accountChanged(AccountCBData const*) [c:\riverware\staff\philw\dev1\accounting\accountmgr.cpp:4751]
        Free location
            delete(void *) [C:\RiverWare\staff\philw\dev1\EngrObjs\Debug\riverware.exe]
            ArrowHeadGfxItem::`scalar deleting destructor'(UINT) [C:\RiverWare\staff\philw\dev1\EngrObjs\Debug\riverware.exe]
            SupplyGfxItem::~SupplyGfxItem(void) [c:\riverware\staff\philw\dev1\qtutils\supplygfxitem.cpp:168]
            SupplyGfxItem::`scalar deleting destructor'(UINT) [C:\RiverWare\staff\philw\dev1\EngrObjs\Debug\riverware.exe]
            WorkspaceGfxScene::clearLinkAndSupplyItems(void) [c:\riverware\staff\philw\dev1\qtutils\workspacegfxscene.cpp:1462]
            WorkspaceGfxScene::clearAllItems(void) [c:\riverware\staff\philw\dev1\qtutils\workspacegfxscene.cpp:301]
            CanvasRef::clear(void)const [c:\riverware\staff\philw\dev1\q3gui\canvasref.cpp:270]
            Workspace::clear(void) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:2359]
            Workspace::callbackHandler(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:5749]
            Workspace_allCallbacksCBNoteProc(Callback *,CallbackType,CallbackData *,void *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:5662]

--------------
ERROR 3 DETAIL
--------------

[E] FMR: Free memory read in FindCompleteObject {1 occurrence}

  SEE THREE SECTIONS:
    (a) Error location
    (b) Allocation location
    (c) Free location

        Reading 4 bytes from 0x167fd3b8 (4 bytes at 0x167fd3b8 illegal)
        Address 0x167fd3b8 is at the beginning of a 40 byte block
        Address 0x167fd3b8 points to a C++ new block in heap 0x0eb40000
        Thread ID: 0xd40
        Error location
            FindCompleteObject [f:\dd\vctools\crt_bld\self_x86\crt\prebuild\eh\rtti.cpp:358]
            _RTDynamicCast [f:\dd\vctools\crt_bld\self_x86\crt\prebuild\eh\rtti.cpp:256]
            WorkspaceGfxScene::clearLinkAndSupplyItems(void) [c:\riverware\staff\philw\dev1\qtutils\workspacegfxscene.cpp:1449]
                   {
                      QGraphicsItem* item = itemList.at (itemInx);
                
             =>       LinkGfxItem* linkItem = dynamic_cast<LinkGfxItem*> (item);
                      if (linkItem)
                      {
                         removeItem (linkItem);
            WorkspaceGfxScene::clearAllItems(void) [c:\riverware\staff\philw\dev1\qtutils\workspacegfxscene.cpp:301]
                   stopSimLinkOp();
                   clearSelection();  // [QGraphicsScene]
                   clearFocus();      // [QGraphicsScene]
             =>    clearLinkAndSupplyItems();
                   clear();           // [QGraphicsScene]
                
                   // Set "Is Cleared" flag in RwGraphicsScene base class.
            CanvasRef::clear(void)const [c:\riverware\staff\philw\dev1\q3gui\canvasref.cpp:270]
                
                   else if (_wsGfxScene)
                   {
             =>       _wsGfxScene->clearAllItems();
                      _wsGfxScene->clearBgImage();
                   }
                }
            Workspace::clear(void) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:2359]
                   {
                      CanvasRef* canv = _definedCanvasRefs [inx];
                      // canv->hide(); -- EXPERIMENTAL
             =>       canv->clear();
                   }
                
                   _wsListView->clear();
            Workspace::callbackHandler(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:5749]
                
                       case WS_CLEARING:
                       {
             =>           clear();
                          break;
                       }
                
            Workspace_allCallbacksCBNoteProc(Callback *,CallbackType,CallbackData *,void *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:5662]
                
                   Workspace *workspace = (Workspace*) clientData;
                
             =>    workspace->callbackHandler(type, data);
                }
                
                //----------------------------------------------------------------------------
            FunctionCb::invoke(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\sim\functioncb.cpp:13]
                void FunctionCb::invoke(CallbackType type,
                                        CallbackData* cbData)
                {
             =>     (*_func)(this, type, cbData, clientData());
                }
            Root::callCallbacks(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\sim\root.cpp:222]
                            // validity of `iter'.
                            cb->incrActive();
                
             =>             cb->invoke(type, cbData);
                
                            tbd = iter++;           // to be deleted, maybe...
                
        Allocation location
            new(UINT)      [C:\RiverWare\staff\philw\dev1\EngrObjs\Debug\riverware.exe]
            SupplyGfxItem::SupplyGfxItem(Supply *,AccountGfxItem *,AccountGfxItem *,WorkspaceGfxScene *) [c:\riverware\staff\philw\dev1\qtutils\supplygfxitem.cpp:112]
                   pen.setWidth (newWidth);
                   setPen (pen);
                
             =>    _arrowHeadItem = new ArrowHeadGfxItem (this);
                   _arrowHeadItem->setVisible (false);
                
                   if ( rwAssert (_toAcctItem   != NULL) &&
            WorkspaceGfxScene::addSupplyItem(Supply *) [c:\riverware\staff\philw\dev1\qtutils\workspacegfxscene.cpp:1744]
                      else // (other type of supply)
                      {
                         SupplyGfxItem* supplyItem =
             =>             new SupplyGfxItem (refSupply, acctItem1, acctItem2, this);
                
                         addItem (supplyItem);
                         supplyItem->show();
            CanvasRef::addSupply(Supply *)const [c:\riverware\staff\philw\dev1\q3gui\canvasref.cpp:355]
                
                   else if (_wsGfxScene)
                   {
             =>       _wsGfxScene->addSupplyItem (sply);
                   }
                }
                
            Workspace::addSupply(Supply *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:2664]
                   for (int inx = 0; inx < canvCnt; inx++)
                   {
                      CanvasRef* canv = _definedCanvasRefs [inx];
             =>       canv->addSupply(supply);
                   }
                }
                
            Workspace::callbackHandler(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:5884]
                              {
                                 Supply *supply = (Supply*) callbackData->getData();
                
             =>                  addSupply(supply);
                
                                 break;
                              }
            Workspace_allCallbacksCBNoteProc(Callback *,CallbackType,CallbackData *,void *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:5662]
                
                   Workspace *workspace = (Workspace*) clientData;
                
             =>    workspace->callbackHandler(type, data);
                }
                
                //----------------------------------------------------------------------------
            FunctionCb::invoke(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\sim\functioncb.cpp:13]
                void FunctionCb::invoke(CallbackType type,
                                        CallbackData* cbData)
                {
             =>     (*_func)(this, type, cbData, clientData());
                }
            Root::callCallbacks(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\sim\root.cpp:222]
                            // validity of `iter'.
                            cb->incrActive();
                
             =>             cb->invoke(type, cbData);
                
                            tbd = iter++;           // to be deleted, maybe...
                
            AccountMgr::accountChanged(AccountCBData const*) [c:\riverware\staff\philw\dev1\accounting\accountmgr.cpp:4751]
                    if (numCallbacks() != 0)
                    {
                        // ok cast
             =>         callCallbacks(ACCOUNT_CHANGED, (CallbackData *) data);
                    }
                
                    // Inform root selections of changes to accounts (this includes
        Free location
            delete(void *) [C:\RiverWare\staff\philw\dev1\EngrObjs\Debug\riverware.exe]
            ArrowHeadGfxItem::`scalar deleting destructor'(UINT) [C:\RiverWare\staff\philw\dev1\EngrObjs\Debug\riverware.exe]
            SupplyGfxItem::~SupplyGfxItem(void) [c:\riverware\staff\philw\dev1\qtutils\supplygfxitem.cpp:168]
                      QGraphicsItem* delItem = _arrowHeadItem;
                      _arrowHeadItem = NULL;
                      delItem->hide();
             =>       delete delItem;
                   }
                }
                
            SupplyGfxItem::`scalar deleting destructor'(UINT) [C:\RiverWare\staff\philw\dev1\EngrObjs\Debug\riverware.exe]
            WorkspaceGfxScene::clearLinkAndSupplyItems(void) [c:\riverware\staff\philw\dev1\qtutils\workspacegfxscene.cpp:1462]
                      if (supplyItem)
                      {
                         removeItem (supplyItem);
             =>          delete supplyItem;
                         continue;
                         //-------
                      }
            WorkspaceGfxScene::clearAllItems(void) [c:\riverware\staff\philw\dev1\qtutils\workspacegfxscene.cpp:301]
                   stopSimLinkOp();
                   clearSelection();  // [QGraphicsScene]
                   clearFocus();      // [QGraphicsScene]
             =>    clearLinkAndSupplyItems();
                   clear();           // [QGraphicsScene]
                
                   // Set "Is Cleared" flag in RwGraphicsScene base class.
            CanvasRef::clear(void)const [c:\riverware\staff\philw\dev1\q3gui\canvasref.cpp:270]
                
                   else if (_wsGfxScene)
                   {
             =>       _wsGfxScene->clearAllItems();
                      _wsGfxScene->clearBgImage();
                   }
                }
            Workspace::clear(void) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:2359]
                   {
                      CanvasRef* canv = _definedCanvasRefs [inx];
                      // canv->hide(); -- EXPERIMENTAL
             =>       canv->clear();
                   }
                
                   _wsListView->clear();
            Workspace::callbackHandler(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:5749]
                
                       case WS_CLEARING:
                       {
             =>           clear();
                          break;
                       }
                
            Workspace_allCallbacksCBNoteProc(Callback *,CallbackType,CallbackData *,void *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:5662]
                
                   Workspace *workspace = (Workspace*) clientData;
                
             =>    workspace->callbackHandler(type, data);
                }
                
                //----------------------------------------------------------------------------


=========================================================================

----------------
ERROR 4 OVERVIEW
----------------

[E] IPR: Invalid pointer read in FindCompleteObject {1 occurrence}
        Reading 4 bytes from 0xaeaeaeaa (4 bytes at 0xaeaeaeaa illegal)
        Address 0xaeaeaeaa points into invalid memory 
        Thread ID: 0xd40
        Error location
            FindCompleteObject [f:\dd\vctools\crt_bld\self_x86\crt\prebuild\eh\rtti.cpp:358]
            _RTDynamicCast [f:\dd\vctools\crt_bld\self_x86\crt\prebuild\eh\rtti.cpp:256]
            WorkspaceGfxScene::clearLinkAndSupplyItems(void) [c:\riverware\staff\philw\dev1\qtutils\workspacegfxscene.cpp:1449]
            WorkspaceGfxScene::clearAllItems(void) [c:\riverware\staff\philw\dev1\qtutils\workspacegfxscene.cpp:301]
            CanvasRef::clear(void)const [c:\riverware\staff\philw\dev1\q3gui\canvasref.cpp:270]
            Workspace::clear(void) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:2359]
            Workspace::callbackHandler(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:5749]
            Workspace_allCallbacksCBNoteProc(Callback *,CallbackType,CallbackData *,void *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:5662]
            FunctionCb::invoke(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\sim\functioncb.cpp:13]
            Root::callCallbacks(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\sim\root.cpp:222]

--------------
ERROR 4 DETAIL
--------------

    [E] IPR: Invalid pointer read in FindCompleteObject {1 occurrence}
        Reading 4 bytes from 0xaeaeaeaa (4 bytes at 0xaeaeaeaa illegal)
        Address 0xaeaeaeaa points into invalid memory 
        Thread ID: 0xd40
        Error location
        FindCompleteObject [f:\dd\vctools\crt_bld\self_x86\crt\prebuild\eh\rtti.cpp:358]
        _RTDynamicCast [f:\dd\vctools\crt_bld\self_x86\crt\prebuild\eh\rtti.cpp:256]
        WorkspaceGfxScene::clearLinkAndSupplyItems(void) [c:\riverware\staff\philw\dev1\qtutils\workspacegfxscene.cpp:1449]
           {
              QGraphicsItem* item = itemList.at (itemInx);
        
     =>       LinkGfxItem* linkItem = dynamic_cast<LinkGfxItem*> (item);
              if (linkItem)
              {
                 removeItem (linkItem);
        WorkspaceGfxScene::clearAllItems(void) [c:\riverware\staff\philw\dev1\qtutils\workspacegfxscene.cpp:301]
           stopSimLinkOp();
           clearSelection();  // [QGraphicsScene]
           clearFocus();      // [QGraphicsScene]
     =>    clearLinkAndSupplyItems();
           clear();           // [QGraphicsScene]
        
           // Set "Is Cleared" flag in RwGraphicsScene base class.
        CanvasRef::clear(void)const [c:\riverware\staff\philw\dev1\q3gui\canvasref.cpp:270]
        
           else if (_wsGfxScene)
           {
     =>       _wsGfxScene->clearAllItems();
              _wsGfxScene->clearBgImage();
           }
        }
    Workspace::clear(void) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:2359]
           {
              CanvasRef* canv = _definedCanvasRefs [inx];
              // canv->hide(); -- EXPERIMENTAL
     =>       canv->clear();
           }
        
           _wsListView->clear();
    Workspace::callbackHandler(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:5749]
        
               case WS_CLEARING:
               {
     =>           clear();
                  break;
               }
        
    Workspace_allCallbacksCBNoteProc(Callback *,CallbackType,CallbackData *,void *) [c:\riverware\staff\philw\dev1\q3gui\workspace.cpp:5662]
        
           Workspace *workspace = (Workspace*) clientData;
        
     =>    workspace->callbackHandler(type, data);
        }
        
        //----------------------------------------------------------------------------
    FunctionCb::invoke(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\sim\functioncb.cpp:13]
        void FunctionCb::invoke(CallbackType type,
                                CallbackData* cbData)
        {
     =>     (*_func)(this, type, cbData, clientData());
        }
    Root::callCallbacks(CallbackType,CallbackData *) [c:\riverware\staff\philw\dev1\sim\root.cpp:222]
                    // validity of `iter'.
                    cb->incrActive();
        
     =>             cb->invoke(type, cbData);
        
                    tbd = iter++;           // to be deleted, maybe...

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