150 lines
5.4 KiB
C++
150 lines
5.4 KiB
C++
/* ========================================================================= *
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* *
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* OpenMesh *
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* Copyright (c) 2001-2015, RWTH-Aachen University *
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* Department of Computer Graphics and Multimedia *
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* All rights reserved. *
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* www.openmesh.org *
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* *
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*---------------------------------------------------------------------------*
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* This file is part of OpenMesh. *
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*---------------------------------------------------------------------------*
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* *
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* Redistribution and use in source and binary forms, with or without *
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* modification, are permitted provided that the following conditions *
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* are met: *
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* *
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* 1. Redistributions of source code must retain the above copyright notice, *
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* this list of conditions and the following disclaimer. *
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* *
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* 2. Redistributions in binary form must reproduce the above copyright *
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* notice, this list of conditions and the following disclaimer in the *
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* documentation and/or other materials provided with the distribution. *
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* *
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* 3. Neither the name of the copyright holder nor the names of its *
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* contributors may be used to endorse or promote products derived from *
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* this software without specific prior written permission. *
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* *
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS *
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER *
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, *
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, *
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR *
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF *
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING *
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS *
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
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* *
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* ========================================================================= */
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//=============================================================================
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//
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// Implements a simple singleton template
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//
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//=============================================================================
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#ifndef __SINGLETON_HH__
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#define __SINGLETON_HH__
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//=== INCLUDES ================================================================
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// OpenMesh
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#include <OpenMesh/Core/System/config.h>
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// STL
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#include <stdexcept>
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//== NAMESPACES ===============================================================
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namespace OpenMesh {
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//=== IMPLEMENTATION ==========================================================
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/** A simple singleton template.
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Encapsulates an arbitrary class and enforces its uniqueness.
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*/
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template <typename T>
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class SingletonT
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{
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public:
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/** Singleton access function.
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Use this function to obtain a reference to the instance of the
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encapsulated class. Note that this instance is unique and created
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on the first call to Instance().
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*/
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static T& Instance()
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{
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if (!pInstance__)
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{
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// check if singleton alive
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if (destroyed__)
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{
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OnDeadReference();
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}
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// first time request -> initialize
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else
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{
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Create();
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}
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}
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return *pInstance__;
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}
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private:
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// Disable constructors/assignment to enforce uniqueness
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SingletonT();
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SingletonT(const SingletonT&);
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SingletonT& operator=(const SingletonT&);
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// Create a new singleton and store its pointer
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static void Create()
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{
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static T theInstance;
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pInstance__ = &theInstance;
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}
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// Will be called if instance is accessed after its lifetime has expired
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static void OnDeadReference()
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{
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throw std::runtime_error("[Singelton error] - Dead reference detected!\n");
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}
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virtual ~SingletonT()
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{
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pInstance__ = 0;
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destroyed__ = true;
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}
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static T* pInstance__;
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static bool destroyed__;
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};
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//=============================================================================
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} // namespace OpenMesh
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//=============================================================================
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#if defined(OM_INCLUDE_TEMPLATES) && !defined(OPENMESH_SINGLETON_C)
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# define OPENMESH_SINGLETON_TEMPLATES
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# include "SingletonT_impl.hh"
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#endif
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//=============================================================================
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#endif // __SINGLETON_HH__
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//=============================================================================
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