Singleton.h

#pragma once
 
namespace Nui
{
    template <typename T>
    class Singleton final
    {
    public:
        static T& Get() noexcept
        {
            return *GetPtr();
        }
 
        static void Destroy() noexcept
        {
            T* ptr = GetPtr();
            if (ptr)
            {
                delete ptr;
                ptr = nullptr;
            }
        }
 
        Singleton(Singleton&&) = delete;
        Singleton(const Singleton&) = delete;
        Singleton& operator=(Singleton&&) = delete;
        Singleton& operator=(Singleton&) = delete;
 
    private:
 
        static T* GetPtr() noexcept
        {
            static Singleton<T> s_instance;
            return s_instance.m_obj;
        }
 
    private:
        Singleton() = default;
 
        T* m_obj = new T();
    };
}