inverted-factory.cpp

struct FooInterface; // full definition irrelevant here
struct FooFactoryInterface {
  virtual FooInterface* create(int p1, float p2) = 0;
};

class Foo : public FooInterface {
public:
  Foo(FooFactoryInterface& f):f_(f) {}
  bool init(int p1, float p2) {
    foo_.reset(f_.create(p1, p2));
    return foo_;
  }
private:
  FooFactoryInterface& f_;
  std::unique_ptr<FooInterface> foo_;
};