MyGUI_Singleton.h

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/*
 * This source file is part of MyGUI. For the latest info, see http://mygui.info/
 * Distributed under the MIT License
 * (See accompanying file COPYING.MIT or copy at http://opensource.org/licenses/MIT)
 */

#ifndef __MYGUI_SINGLETON_H__
#define __MYGUI_SINGLETON_H__

#include "MyGUI_Diagnostic.h"

namespace MyGUI
{

#if MYGUI_COMPILER == MYGUI_COMPILER_MSVC || MYGUI_PLATFORM == MYGUI_PLATFORM_APPLE
    template <class T>
    class Singleton
#else
    template <class T>
    class MYGUI_EXPORT Singleton
#endif
    {
    public:
        typedef Singleton<T> Base;

        Singleton()
        {
            MYGUI_ASSERT(nullptr == msInstance, "Singleton instance " << getClassTypeName() << " already exsist");
            msInstance = static_cast<T*>(this);
        }

        virtual ~Singleton()
        {
            MYGUI_ASSERT(nullptr != msInstance, "Destroying Singleton instance " << getClassTypeName() << " before constructing it.");
            msInstance = nullptr;
        }

        static T& getInstance()
        {
            MYGUI_ASSERT(nullptr != getInstancePtr(), "Singleton instance " << getClassTypeName() << " was not created");
            return (*getInstancePtr());
        }

        static T* getInstancePtr()
        {
            return msInstance;
        }

        static const char* getClassTypeName()
        {
            return mClassTypeName;
        }

    private:
        static T* msInstance;
        static const char* mClassTypeName;
    };

} // namespace MyGUI

#endif // __MYGUI_SINGLETON_H__