Purpose: Delete an element at position. Method: This calls _findDnodeByPos to eastablish the target data node and slot for the requested position within the ISAM. It then calls _expelData() to delete the slot from the target node.

Declared in file: hzIsamT.h
Defined in file : hzIsamT.cpp

Function Logic:

Function body:

hzEcode _hz_tmpl_ISAM::DeletePosn (uint32_t nPosn)
{
   //  Purpose: Delete an element at position.
   //  
   //  Method:  This calls _findDnodeByPos to eastablish the target data node and slot for the requested position within the ISAM. It then calls _expelData() to delete
   //     the slot from the target node.
   //  
   //  Arguments: 1) nPosn Position of object to delete
   //  
   //  Returns: E_OK  If operation successful
   //     E_RANGE  If position was invalid
   //     E_NODATA If element was a null
   //     E_MEMORY If there was insufficient memory
   _hzfunc("_hz_tmpl_ISAM::DeletePosn") ;
   _hz_vn_Dat* pTgt = 0;   //  Target data node (from which delete will occur)
   int32_t     nSlot ;     //  Position within node
   //  Check args
   if (!Root())
       return E_NOTFOUND ;
   if (nPosn < 0|| nPosn >&eq; Cumulative())
       return E_RANGE ;
   //  Locate the 'target' top level node
   pTgt = (_hz_vn_Dat*) _findDnodeByPos(nSlot, nPosn, false) ;
   if (!pTgt)
       Fatal("Isam=%d: No data node found in spite of position %d being within range %d\n", IsamId(), nPosn, Cumulative()) ;
   if (nSlot >&eq; HZ_T_ISAMNODE_FULL)
       Fatal("Isam=%d: Illegal slot no %d for node %d\n", IsamId(), nSlot, pTgt->m_Id) ;
   //  Expel the entity from the node
   //  mx->m_nElements-- ;
   _expelDataSlot(pTgt, nSlot) ;
   if (Count() != Population())
       Fatal("Isam=%d: Expected population %d, actual %d\n", IsamId(), Population(), Count()) ;
   return E_OK ;
}