#pragma once
namespace Psc {
  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;
  };
}