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 // Created on: 1993-02-26
 // Created by: Remi LEQUETTE
 // Copyright (c) 1993-1999 Matra Datavision
 // Copyright (c) 1999-2014 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 _TopLoc_SListOfItemLocation_HeaderFile
 #define _TopLoc_SListOfItemLocation_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <Standard_Macro.hxx>
 class TopLoc_SListNodeOfItemLocation;
 class TopLoc_ItemLocation;
 
 //! An SListOfItemLocation is a LISP like list of Items.
 //! An SListOfItemLocation is:
 //! . Empty.
 //! . Or it has a Value and a Tail which is an other SListOfItemLocation.
 //!
 //! The Tail of an empty list is an empty list.
 //! SListOfItemLocation are shared. It means that they can be
 //! modified through other lists.
 //! SListOfItemLocation may be used as Iterators. They have Next,
 //! More, and value methods. To iterate on the content
 //! of the list S just do.
 //!
 //! SListOfItemLocation Iterator;
 //! for (Iterator = S; Iterator.More(); Iterator.Next())
 //! X = Iterator.Value();
 class TopLoc_SListOfItemLocation
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Creates an empty List.
   TopLoc_SListOfItemLocation() = default;
 
   //! Creates a List with <anItem> as value and <aTail> as tail.
   Standard_EXPORT TopLoc_SListOfItemLocation(const TopLoc_ItemLocation&        anItem,
                                              const TopLoc_SListOfItemLocation& aTail);
 
   //! Creates a list from an other one. The lists are shared.
   TopLoc_SListOfItemLocation(const TopLoc_SListOfItemLocation& Other) = default;
 
   //! Sets a list from an other one. The lists are
   //! shared. The list itself is returned.
   Standard_EXPORT TopLoc_SListOfItemLocation& Assign(const TopLoc_SListOfItemLocation& Other);
 
   //! Assignment
   TopLoc_SListOfItemLocation& operator=(const TopLoc_SListOfItemLocation& Other)
   {
     return Assign(Other);
   }
 
   //! Move constructor
   TopLoc_SListOfItemLocation(TopLoc_SListOfItemLocation&& theOther) noexcept
       : myNode(std::move(theOther.myNode))
   {
   }
 
   //! Move operator
   TopLoc_SListOfItemLocation& operator=(TopLoc_SListOfItemLocation&& theOther) noexcept
   {
     myNode = std::move(theOther.myNode);
     return *this;
   }
 
   //! Return true if this list is empty
   bool IsEmpty() const noexcept { return myNode.IsNull(); }
 
   //! Sets the list to be empty.
   void Clear() noexcept { myNode.Nullify(); }
 
   //! Destructor
   ~TopLoc_SListOfItemLocation() noexcept { Clear(); }
 
   //! Returns the current value of the list. An error is
   //! raised if the list is empty.
   Standard_EXPORT const TopLoc_ItemLocation& Value() const;
 
   //! Returns the current tail of the list. On an empty
   //! list the tail is the list itself.
   Standard_EXPORT const TopLoc_SListOfItemLocation& Tail() const;
 
   //! Replaces the list by a list with <anItem> as Value
   //! and the list <me> as tail.
   void Construct(const TopLoc_ItemLocation& anItem)
   {
     Assign(TopLoc_SListOfItemLocation(anItem, *this));
   }
 
   //! Replaces the list <me> by its tail.
   void ToTail() { Assign(Tail()); }
 
   //! Returns True if the iterator has a current value.
   //! This is !IsEmpty()
   bool More() const noexcept { return !IsEmpty(); }
 
   //! Moves the iterator to the next object in the list.
   //! If the iterator is empty it will stay empty. This is ToTail()
   void Next() { ToTail(); }
 
 private:
   occ::handle<TopLoc_SListNodeOfItemLocation> myNode;
 };
 
 #endif // _TopLoc_SListOfItemLocation_HeaderFile

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