OCCT

// Created on: 2002-04-23
// Created by: Alexander KARTOMIN (akm)
// Copyright (c) 2002-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#ifndef NCollection_TListNode_HeaderFile
#define NCollection_TListNode_HeaderFile

#include <NCollection_ListNode.hxx>
#include <utility>

/**
 * Purpose:     Abstract list node class. Used by BaseList
 * Remark:      Internal class
 */
template <class TheItemType>
class NCollection_TListNode : public NCollection_ListNode
{
public:
  //! Constructor
  NCollection_TListNode(const TheItemType& theItem, NCollection_ListNode* theNext = nullptr)
      : NCollection_ListNode(theNext),
        myValue(theItem)
  {
  }

  NCollection_TListNode(TheItemType&& theItem, NCollection_ListNode* theNext = nullptr)
      : NCollection_ListNode(theNext),
        myValue(std::forward<TheItemType>(theItem))
  {
  }

  //! Constructor with in-place value construction
  template <typename... Args>
  NCollection_TListNode(std::in_place_t, NCollection_ListNode* theNext, Args&&... theArgs)
      : NCollection_ListNode(theNext),
        myValue(std::forward<Args>(theArgs)...)
  {
  }

  //! Constant value access
  const TheItemType& Value() const noexcept { return myValue; }

  //! Variable value access
  TheItemType& ChangeValue() noexcept { return myValue; }

  //! Static deleter to be passed to BaseList
  static void delNode(NCollection_ListNode* theNode, occ::handle<NCollection_BaseAllocator>& theAl)
  {
    ((NCollection_TListNode*)theNode)->myValue.~TheItemType();
    theAl->Free(theNode);
  }

protected:
  TheItemType myValue; //!< The item stored in the node
};

#endif