54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
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// Copyright (c) 2011 Tel-Aviv University (Israel), INRIA Sophia-Antipolis (France).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org).
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Arrangement_on_surface_2/include/CGAL/Arr_rat_arc/Singleton.h $
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// $Id: Singleton.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
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//
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// Author(s) : Oren Salzman <orenzalz@post.tau.ac.il >
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// Michael Hemmer <Michael.Hemmer@sophia.inria.fr>
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#ifndef CGAL_SINGLETON_H_
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#define SINGLETON_H_
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#include <CGAL/license/Arrangement_on_surface_2.h>
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#include <CGAL/assertions.h>
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namespace CGAL {
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namespace Arr_rational_arc {
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template <class T>
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class Singleton
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{
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public:
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static T* instance()
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{
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if(!m_pInstance)
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m_pInstance = new T;
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CGAL_assertion(m_pInstance !=nullptr);
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return m_pInstance;
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}
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static void DestroyInstance()
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{
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delete m_pInstance;
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m_pInstance = nullptr;
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};
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private:
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Singleton(); // ctor hidden
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~Singleton(); // dtor hidden
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private:
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static T* m_pInstance;
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};
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template <class T> T* Singleton<T>::m_pInstance=nullptr;
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} // namespace Arr_rational_arc
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} //namespace CGAL {
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#endif // CGAL_SINGLETON_H_
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