#ifndef Toolbox_Singleton_H
#define Toolbox_Singleton_H
namespace Toolbox {
    template<typename Derived>
    class Singleton {
    public:
        static Derived *instance() {
            static Derived instance;
            return &instance;
        }
        Singleton(const Singleton &) = delete;
        Singleton &operator=(const Singleton &) = delete;
    protected:
        Singleton() = default;
        ~Singleton() = default;
    };
}
#endif