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copied!<p>I think Composite pattern (<a href="http://en.wikipedia.org/wiki/Composite_pattern" rel="nofollow">http://en.wikipedia.org/wiki/Composite_pattern</a>) is better for your needs.</p> <p>It would be some variation like this (naming is a bit screwed in terms of pattern, but they are more like your code this way):</p> <pre><code>class Activity { public: virtual ~Activity(); virtual void start(); virtual void add(Activity*); virtual void remove(Activity*); private: Activity(); } class ActivityManager : Activity { public: ConcreteActivity(); ~ConcreteActivity(); void start(); void add(Activity*); void remove(Activity*); private: list<Activity*> _activities; } void ActivityManager::start() { list<Activity*>::const_iterator concreteActivity; for(concreteActivity = _activities.begin(), concreteActivity != _activities.end(); ++concreteActivity) { *concreteActivity->start(); } } void ActivityManager::add(Activity* newActivity) { _activities.push_back(newActivity); } void ActivityManager::remove(Activity* activityToDelete) { _activities.remove(activityToDelete); } class SomeActivity : Activity { public: SomeActivity(); ~SomeActivity(); void start(); } class OtherActivity : Activity { public: OtherActivity(); ~OtherActivity(); void start(); } </code></pre> <p>And the example of usage:</p> <pre><code>ActivityManager* manager = new ActivityManager(); SomeActivity* activity_one = new SomeActivity(); OtherActivity* activity_two = new OtherActivity(); manager->add(activity_one); manager->add(activity_two); manager->start(); </code></pre> <p>And you still can make ActivityManager the Singleton, if you want. Without any additional info on your project, can't think of a better way.</p>

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