singleton_bugfix.h

/*
**  UICore
**  Copyright (c) 1997-2015 The UICore Team
**
**  This software is provided 'as-is', without any express or implied
**  warranty.  In no event will the authors be held liable for any damages
**  arising from the use of this software.
**
**  Permission is granted to anyone to use this software for any purpose,
**  including commercial applications, and to alter it and redistribute it
**  freely, subject to the following restrictions:
**
**  1. The origin of this software must not be misrepresented; you must not
**     claim that you wrote the original software. If you use this software
**     in a product, an acknowledgment in the product documentation would be
**     appreciated but is not required.
**  2. Altered source versions must be plainly marked as such, and must not be
**     misrepresented as being the original software.
**  3. This notice may not be removed or altered from any source distribution.
**
**  Note: Some of the libraries UICore may link to may have additional
**  requirements or restrictions.
**
**  File Author(s):
**
**    Magnus Norddahl
*/

#pragma once

#include <memory>
#include <functional>

namespace uicore
{
    class SingletonBugfix
    {
    public:
        static void deinitialize();
        static void add_destructor(std::function<void()> destructor);
    };
    
    template<typename T>
    class Singleton
    {
    public:
        Singleton() : value(new T)
        {
            SingletonBugfix::add_destructor([this]() { value.reset(); });
        }

        T *get() { return value.get(); }
        T *operator->() { return value.get(); }

    private:
        Singleton(const Singleton &) = delete;
        Singleton &operator=(const Singleton &) = delete;

        std::unique_ptr<T> value;
    };
}