Wrapper for const correct access via Smart pointer types. More...

#include <PtrTypes.h>

Public Types
typedef _Traits::_Ptr	_Ptr
typedef _Traits::_constPtr	_constPtr
typedef _Ptr::unspecified_bool_type	unspecified_bool_type

Public Member Functions
	RW_pointer (typename _Ptr::element_type *dptr=0)
	RW_pointer (_Ptr dptr)
void	reset ()
void	reset (typename _Ptr::element_type *dptr)
void	swap (RW_pointer &rhs)
void	swap (_Ptr &rhs)
	operator unspecified_bool_type () const
const _D &	operator* () const
const _D *	operator-> () const
const _D *	get () const
_D &	operator* ()
_D *	operator-> ()
_D *	get ()
bool	unique () const
long	use_count () const
_constPtr	getPtr () const
_Ptr	getPtr ()
_constPtr	cgetPtr ()

Private Attributes
_Ptr	_dptr

Related Functions
(Note that these are not member functions.)
template<class _D , class _Ptr >
std::ostream &	operator<< (std::ostream &str, const RW_pointer< _D, _Ptr > &obj)
template<class _D , class _Ptr >
bool	operator== (const RW_pointer< _D, _Ptr > &lhs, const RW_pointer< _D, _Ptr > &rhs)
template<class _D , class _Ptr >
bool	operator== (const RW_pointer< _D, _Ptr > &lhs, const typename _Ptr::_Ptr &rhs)
template<class _D , class _Ptr >
bool	operator== (const typename _Ptr::_Ptr &lhs, const RW_pointer< _D, _Ptr > &rhs)
template<class _D , class _Ptr >
bool	operator== (const RW_pointer< _D, _Ptr > &lhs, const typename _Ptr::_constPtr &rhs)
template<class _D , class _Ptr >
bool	operator== (const typename _Ptr::_constPtr &lhs, const RW_pointer< _D, _Ptr > &rhs)
template<class _D , class _Ptr >
bool	operator!= (const RW_pointer< _D, _Ptr > &lhs, const RW_pointer< _D, _Ptr > &rhs)
template<class _D , class _Ptr >
bool	operator!= (const RW_pointer< _D, _Ptr > &lhs, const typename _Ptr::_Ptr &rhs)
template<class _D , class _Ptr >
bool	operator!= (const typename _Ptr::_Ptr &lhs, const RW_pointer< _D, _Ptr > &rhs)
template<class _D , class _Ptr >
bool	operator!= (const RW_pointer< _D, _Ptr > &lhs, const typename _Ptr::_constPtr &rhs)
template<class _D , class _Ptr >
bool	operator!= (const typename _Ptr::_constPtr &lhs, const RW_pointer< _D, _Ptr > &rhs)

Detailed Description

template<class _D, class _Traits = rw_pointer::Shared<_D>>
struct zypp::RW_pointer< _D, _Traits >

Wrapper for const correct access via Smart pointer types.

zypp::RW_pointer<tt><D,_Traits> stores a Smart pointer types of type _Traits::_Ptr, which must be convertible into a _D *. Pointer style access (via -> and *) offers a const _D * in const a context, otherwise a _D *. Thus RW means read/write, as you get a different type, dependent on whether you're allowed to read or write.

Forwarding access from an interface to an implemantation class, an RW_pointer prevents const interface methods from accidentally calling nonconst implementation methods.

The second template argument defaults to _Traits = rw_pointer::Shared<_D> thus wraping a shared_ptr<_D>. To wrap an intrusive_ptr<_D> use rw_pointer::Intrusive<_D>.

See also:: zypp::RWCOW_pointer for 'copy on write' functionality.

 #include "zypp/base/PtrTypes.h"
 class Foo
 {
   ...
   private:
     // Implementation class
     struct Impl;
     // Pointer to implementation; actually a shared_ptr<Impl>
     RW_pointer<Impl> _pimpl;
     void baa()       { _pimpl->... } // is Impl *
     void baa() const { _pimpl->... } // is Impl const *
 };

Definition at line 265 of file PtrTypes.h.