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105 lines
3.3 KiB
C++
105 lines
3.3 KiB
C++
// Created on: 2009-01-30
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// Created by: Andrey BETENEV (abv)
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// Copyright (c) 2009-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef NCollection_Handle_HeaderFile
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#define NCollection_Handle_HeaderFile
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#include <Standard_Transient.hxx>
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#include <Standard_Handle.hxx>
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//! Purpose: This template class is used to define Handle adaptor
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//! for allocated dynamically objects of arbitrary type.
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//!
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//! The advantage is that this handle will automatically destroy
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//! the object when last referred Handle is destroyed (i.e. it is a
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//! typical smart pointer), and that it can be handled as
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//! Handle(Standard_Transient) in OCCT components.
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template <class T>
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class NCollection_Handle : public opencascade::handle<Standard_Transient>
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{
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private:
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//! Internal adaptor class wrapping actual type
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//! and enhancing it by reference counter inherited from
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//! Standard_Transient
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class Ptr : public Standard_Transient
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{
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public:
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//! Constructor: stores pointer to the object
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Ptr (T* theObj) : myPtr (theObj) {}
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//! Destructor deletes the object
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~Ptr () { if ( myPtr ) delete myPtr; myPtr = 0; }
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protected:
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//! Copy constructor
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Ptr(const Ptr&);
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//! Assignment operator
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Ptr& operator=(const Ptr&);
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public:
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T* myPtr; //!< Pointer to the object
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};
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//! Constructor of handle from pointer on newly allocated object.
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//! Note that additional argument is used to avoid ambiguity with
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//! public constructor from pointer when Handle is intilialized by 0.
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NCollection_Handle (Ptr* thePtr, int)
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: opencascade::handle<Standard_Transient> (thePtr) {}
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public:
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typedef T element_type;
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//! Default constructor; creates null handle
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NCollection_Handle () {}
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//! Constructor of handle from pointer on newly allocated object
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NCollection_Handle (T* theObject)
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: opencascade::handle<Standard_Transient> (theObject ? new Ptr (theObject) : 0) {}
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//! Cast handle to contained type
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T* get () { return ((Ptr*)opencascade::handle<Standard_Transient>::get())->myPtr; }
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//! Cast handle to contained type
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const T* get () const { return ((Ptr*)opencascade::handle<Standard_Transient>::get())->myPtr; }
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//! Cast handle to contained type
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T* operator -> () { return get(); }
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//! Cast handle to contained type
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const T* operator -> () const { return get(); }
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//! Cast handle to contained type
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T& operator * () { return *get(); }
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//! Cast handle to contained type
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const T& operator * () const { return *get(); }
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//! Downcast arbitrary Handle to the argument type if contained
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//! object is Handle for this type; returns null otherwise
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static NCollection_Handle<T> DownCast (const opencascade::handle<Standard_Transient>& theOther)
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{
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return NCollection_Handle<T>(dynamic_cast<Ptr*>(theOther.get()), 0);
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}
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};
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#endif
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