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of_remove
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Full name
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pfc_n_cst_tree.of_remove
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Access
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public
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Extend of
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integer
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Return value
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integer
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Prototype
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public function integer of_remove(ref n_cst_treenode)
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Name
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Datatype
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lb_height
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boolean
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li_rc
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integer
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lnv_keynode
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n_cst_treenode
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public function integer of_remove (ref n_cst_treenode anv_currentnode);//////////////////////////////////////////////////////////////////////////////
//
// Function: of_remove
//
// Access: public
//
// Arguments :
// anv_currentnode (by ref) : pointer to the node that contains
// the key/data that is to be removed
//
// Returns: integer
// 1 : Success, the node was removed
// -1 : Failure, the node was not found
// -2 : Failure, the node passed in is invalid
//
// Description:
// Removes the node that anv_currentnode identifies. However due to
// the rotations that may have occurred while rebalancing the tree after
// the deletion occurs, the data in the original node may have been
// moved. This function does return the node that was actually
// removed but it may not be the same node that was requested to be
// removed. So be careful and if you need the contents of the node
// after removing it make a copy before removal or use a dummy node
// to identify the node to be deleted. We suggest that you not call this
// function yourself, but use the destroy function to remove and
// destroy the node.
//
//////////////////////////////////////////////////////////////////////////////
//
// Revision History
//
// Version
// 6.0 Initial version
//
//////////////////////////////////////////////////////////////////////////////
//
// Copyright © 1996-1997 Sybase, Inc. and its subsidiaries. All rights reserved.
// Any distribution of the PowerBuilder Foundation Classes (PFC)
// source code by other than Sybase, Inc. and its subsidiaries is prohibited.
//
//////////////////////////////////////////////////////////////////////////////
boolean lb_height = false
n_cst_treenode lnv_keynode
integer li_rc
// Validate arguments.
if isnull(anv_currentnode) or not isvalid(anv_currentnode) then
return -2
end if
setpointer(hourglass!)
// make a copy of the node so that it contains the key and data information
of_create(lnv_keynode)
anv_currentnode.of_copyto(lnv_keynode)
// use the copy to specify the search for the node
li_rc = of_delnode(lnv_keynode,inv_root,lb_height)
anv_currentnode = inv_removednode
destroy lnv_keynode
return li_rc
end function
pfcapsrv.pbl
> 
pfc_n_cst_tree
>