\begingroup\parskip 0pt\baselineskip 0pt\tt {\tt\obeyspaces\gdef {\hskip.5em}} \def\par{\leavevmode\endgraf} \catcode`\`=\active\obeylines \ttverbatimtypedef ... prio_impl_item;class prio_impl {  virtual int  cmp(GenPtr, GenPtr) const = 0; virtual int  int_type()          const = 0; virtual void clear_key(GenPtr&)  const = 0; virtual void clear_inf(GenPtr&)  const = 0; virtual void copy_key(GenPtr&)   const = 0; virtual void copy_inf(GenPtr&)   const = 0;public: prio_impl(); prio_impl(int); prio_impl(int,int); prio_impl(const prio_impl&);~prio_impl(); prio_impl& operator=(const prio_impl&); prio_impl_item insert(GenPtr,GenPtr); prio_impl_item find_min() const; prio_impl_item first_item() const; prio_impl_item next_item(prio_impl_item) const; prio_impl_item item(void* p) const { return prio_impl_item(p); }  GenPtr key(prio_impl_item) const; GenPtr inf(prio_impl_item) const; void del_min(); void del_item(prio_impl_item); void decrease_key(prio_impl_item,GenPtr); void change_inf(prio_impl_item,GenPtr); void clear();   int  size()  const;};\endgroup