287     control_block *control;  member in reference_count::shared_ptr
290     shared_ptr() : p(0), control(0) {}  in shared_ptr()
291     explicit shared_ptr(T *p) : p(p), control(new control_block) {  in shared_ptr()
292       control->retain();  in shared_ptr()
294     shared_ptr(const shared_ptr &other) : p(other.p), control(other.control) {  in shared_ptr()
295       if (control)  in shared_ptr()
296           control->retain();  in shared_ptr()
299       if (control && control->release() == 0) {  in ~shared_ptr()
301         delete control;  in ~shared_ptr()
314       control_block *ctrlTmp = control;  in swap()
315       control = other.control;  in swap()
316       other.control = ctrlTmp;  in swap()