Re: Encapsulating related utility functions

Hi!

Erik Wikstr??m wrote:


There are meaningful semantics of classes with only static members.

For example something like that:

template<class T, class K>
class instance_repository
{public:
   // abstract factory interface used for object instantiation
   struct IFactory
   { virtual T* operator()(K& key) = 0;
   };

  public:
   // Get an existing instance of T or return NULL.
   static intrusive_ptr<T> FindByKey(const K&);
   // Get an existing instance of T or create a new one.
   static intrusive_ptr<T> GetByKey(K& key, IFactory& factory);
  private:
   static sorted_vector<T*, const K&> Index;
   static mutex Mtx; // protect the index above
};

Marcel