Creating Dynamic Singletons & the Loki Library

Listing 1

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class Keyboard {
public:
  Keyboard() { print("Keyboard c'tor"); };
  ~Keyboard() { print("Keyboard d'tor"); }
  void print(const char *s) { cout << s << endl; }
};
inline unsigned int GetLongevity(Keyboard *) { return 10; }
typedef SingletonHolder<
  Keyboard, CreateUsingNew, SingletonWithLongevity
> keyboard;
 ...
keyboard::Instance().echo("Keyboard singleton instantiated");