Singleton.h

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/*=============================================================================
TexGen: Geometric textile modeller.
Copyright (C) 2006 Martin Sherburn
 
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
=============================================================================*/
 
#pragma once
namespace TexGen
{ 
 
    template<typename T>
    class CLASS_DECLSPEC CSingleton
    {
    public:
        CSingleton()
        {
            // There should only be one instance created, only use static GetInstance() function
            // instead of instantiating manually
            assert(this == &CSingleton::GetInstance());
        }
        static T &GetInstance()
        {
            return m_SingleInstance;
        }
    protected:
        static T m_SingleInstance;
    };
 
};  // namespace TexGen