zypp::AutoDispose< _Tp > Class Template Reference

Reference counted access to a _Tp object calling a custom Dispose function when the last AutoDispose handle to it is destroyed or reset. More...

#include <AutoDispose.h>

List of all members.

Public Types

typedef boost::call_traits<
_Tp >::param_type param_type

typedef boost::call_traits<
_Tp >::reference reference

typedef boost::call_traits<
_Tp >::const_reference const_reference

typedef _Tp value_type

typedef boost::call_traits<
_Tp >::value_type result_type

typedef function< void(param_type)> Dispose

Dispose function signatue.

Public Member Functions

AutoDispose ()

Default Ctor using default constructed value and nodispose function.

AutoDispose (param_type value_r)

Ctor taking value and using nodispose function.

AutoDispose (param_type value_r, const Dispose &dispose_r)

Ctor taking value and dispose function.

operator reference () const

Provide implicit conversion to _Tp&.

reference value () const

Reference to the _Tp object.

reference operator * () const

Reference to the _Tp object.

value_type * operator-> () const

Pointer to the _Tp object (asserted to be != NULL<>).

void reset ()

Reset to default Ctor values.

void swap (AutoDispose &rhs)

Exchange the contents of two AutoDispose objects.

const Dispose & getDispose () const

Return the current dispose function.

void setDispose (const Dispose &dispose_r)

Set a new dispose function.

void resetDispose ()

Set nodispose function.

void swapDispose (Dispose &dispose_r)

Exchange the dispose function.

Static Public Member Functions

static void nodispose (param_type)

Noop dispose function.

Private Attributes

shared_ptr< Impl > _pimpl

Related Functions

(Note that these are not member functions.)

std::ostream & operator<< (std::ostream &str, const AutoDispose< _Tp > &obj)

Classes

struct Impl

Detailed Description

template<class _Tp>
class zypp::AutoDispose< _Tp >

Reference counted access to a _Tp object calling a custom Dispose function when the last AutoDispose handle to it is destroyed or reset.

Note:: As with pointers, constness of an AutoDispose object does not apply to the stored _Tp object. If the stored _Tp object should be immutable, you should use AutoDispose<const _Tp><>.

Pass a filename to the application and provide the appropriate code to be exectued when the file is no longer needed:

 struct FileCache
 {
   Pathname getFile();
   void     releaseFile( const Pathname & );
 };

 static FileCache cache;

 void unlink( const Pathname & file_r );

 AutoDispose<const Pathname> provideFile( ... )
 {
   if ( file_is_in_cache )
     {
       // will call 'cache.releaseFile( file )'
       return AutoDispose<const Pathname>( cache.getFile(),
                                           bind( &FileCache::releaseFile, ref(cache), _1 ) );
     }
   else if ( file_is_temporary )
     {
       // will call 'unlink( file )'
       return AutoDispose<const Pathname>( file, unlink );
     }
   else if ( file_is_permanent )
     {
       // will do nothing.
       return AutoDispose<const Pathname>( file );
     }
   else
     {
       // will do nothing.
       return AutoDispose<const Pathname>();
     }
 }

Exception safe handling of temporary files:

 void provideFileAt( const Pathname & destination )
 {
   AutoDispose<const Pathname> guard( destination, unlink );

   // Any exception here will lead to 'unlink( destination )'
   // ...

   // On success: reset the dispose function to NOOP.
   guard.resetDispose();
 }

Definition at line 92 of file AutoDispose.h.

Member Typedef Documentation

template<class _Tp>

typedef boost::call_traits<_Tp>::param_type zypp::AutoDispose< _Tp >::param_type

Definition at line 95 of file AutoDispose.h.

template<class _Tp>

typedef boost::call_traits<_Tp>::reference zypp::AutoDispose< _Tp >::reference

Definition at line 96 of file AutoDispose.h.

template<class _Tp>

typedef boost::call_traits<_Tp>::const_reference zypp::AutoDispose< _Tp >::const_reference

Definition at line 97 of file AutoDispose.h.

template<class _Tp>

typedef _Tp zypp::AutoDispose< _Tp >::value_type

Definition at line 98 of file AutoDispose.h.

template<class _Tp>

typedef boost::call_traits<_Tp>::value_type zypp::AutoDispose< _Tp >::result_type

Definition at line 99 of file AutoDispose.h.

template<class _Tp>

typedef function<void ( param_type )> zypp::AutoDispose< _Tp >::Dispose

Dispose function signatue.

Definition at line 103 of file AutoDispose.h.

Constructor & Destructor Documentation

template<class _Tp>

zypp::AutoDispose< _Tp >::AutoDispose ( ) [inline]

Default Ctor using default constructed value and nodispose function.

Definition at line 110 of file AutoDispose.h.
Referenced by zypp::AutoDispose< _Tp >::reset().

template<class _Tp>

zypp::AutoDispose< _Tp >::AutoDispose ( param_type value_r ) [inline]

Ctor taking value and using nodispose function.

Definition at line 115 of file AutoDispose.h.

template<class _Tp>

zypp::AutoDispose< _Tp >::AutoDispose ( param_type value_r,

const Dispose & dispose_r

) [inline]

Ctor taking value and dispose function.

Definition at line 120 of file AutoDispose.h.

Member Function Documentation

template<class _Tp>

static void zypp::AutoDispose< _Tp >::nodispose ( param_type ) [inline, static]

Noop dispose function.

Definition at line 106 of file AutoDispose.h.
Referenced by zypp::AutoDispose< _Tp >::resetDispose(), and zypp::AutoDispose< _Tp >::Impl::~Impl().

template<class _Tp>

zypp::AutoDispose< _Tp >::operator reference ( ) const [inline]

Provide implicit conversion to _Tp&.

Definition at line 127 of file AutoDispose.h.
References zypp::AutoDispose< _Tp >::_pimpl.

template<class _Tp>

reference zypp::AutoDispose< _Tp >::value ( ) const [inline]

Reference to the _Tp object.

Definition at line 131 of file AutoDispose.h.
References zypp::AutoDispose< _Tp >::_pimpl.

template<class _Tp>

reference zypp::AutoDispose< _Tp >::operator * ( ) const [inline]

Reference to the _Tp object.

Definition at line 135 of file AutoDispose.h.
References zypp::AutoDispose< _Tp >::_pimpl.

template<class _Tp>

value_type* zypp::AutoDispose< _Tp >::operator-> ( ) const [inline]

Pointer to the _Tp object (asserted to be != NULL<>).

Definition at line 139 of file AutoDispose.h.
References zypp::AutoDispose< _Tp >::_pimpl.

template<class _Tp>

void zypp::AutoDispose< _Tp >::reset ( ) [inline]

Reset to default Ctor values.

Definition at line 143 of file AutoDispose.h.
References zypp::AutoDispose< _Tp >::AutoDispose().

template<class _Tp>

void zypp::AutoDispose< _Tp >::swap ( AutoDispose< _Tp > & rhs ) [inline]

Exchange the contents of two AutoDispose objects.

Definition at line 147 of file AutoDispose.h.
References zypp::AutoDispose< _Tp >::_pimpl.

template<class _Tp>

const Dispose& zypp::AutoDispose< _Tp >::getDispose ( ) const [inline]

Return the current dispose function.

Definition at line 152 of file AutoDispose.h.
References zypp::AutoDispose< _Tp >::_pimpl.

template<class _Tp>

void zypp::AutoDispose< _Tp >::setDispose ( const Dispose & dispose_r ) [inline]

Set a new dispose function.

Definition at line 156 of file AutoDispose.h.
References zypp::AutoDispose< _Tp >::_pimpl.
Referenced by zypp::AutoDispose< _Tp >::resetDispose().

template<class _Tp>

void zypp::AutoDispose< _Tp >::resetDispose ( ) [inline]

Set nodispose function.

Definition at line 160 of file AutoDispose.h.
References zypp::AutoDispose< _Tp >::nodispose(), and zypp::AutoDispose< _Tp >::setDispose().
Referenced by zypp::applydeltarpm::provide().

template<class _Tp>

void zypp::AutoDispose< _Tp >::swapDispose ( Dispose & dispose_r ) [inline]

Exchange the dispose function.
+
Definition at line 164 of file AutoDispose.h.
References zypp::AutoDispose< _Tp >::_pimpl.

Friends And Related Function Documentation

template<class _Tp>

std::ostream & operator<< ( std::ostream & str,

const AutoDispose< _Tp > & obj

) [related]

<_Tp> Stream output of the _Tp object.
Definition at line 189 of file AutoDispose.h.

Member Data Documentation

template<class _Tp>

shared_ptr<Impl> zypp::AutoDispose< _Tp >::_pimpl [private]

Definition at line 183 of file AutoDispose.h.
Referenced by zypp::AutoDispose< _Tp >::getDispose(), zypp::AutoDispose< _Tp >::operator *(), zypp::AutoDispose< _Tp >::operator reference(), zypp::AutoDispose< _Tp >::operator->(), zypp::AutoDispose< _Tp >::setDispose(), zypp::AutoDispose< _Tp >::swap(), zypp::AutoDispose< _Tp >::swapDispose(), and zypp::AutoDispose< _Tp >::value().

The documentation for this class was generated from the following file:

zypp/AutoDispose.h

Generated on Thu Sep 14 15:39:05 2006 for zypp by

1.4.6


Public Types
typedef boost::call_traits< _Tp >::param_type	param_type
typedef boost::call_traits< _Tp >::reference	reference
typedef boost::call_traits< _Tp >::const_reference	const_reference
typedef _Tp	value_type
typedef boost::call_traits< _Tp >::value_type	result_type
typedef function< void(param_type)>	Dispose
	Dispose function signatue.
Public Member Functions
	AutoDispose ()
	Default Ctor using default constructed value and nodispose function.
	AutoDispose (param_type value_r)
	Ctor taking value and using nodispose function.
	AutoDispose (param_type value_r, const Dispose &dispose_r)
	Ctor taking value and dispose function.
	operator reference () const
	Provide implicit conversion to `_Tp&`.
reference	value () const
	Reference to the `_Tp` object.
reference	operator * () const
	Reference to the `_Tp` object.
value_type *	operator-> () const
	Pointer to the `_Tp` object (asserted to be `!= NULL<>).`
void	reset ()
	Reset to default Ctor values.
void	swap (AutoDispose &rhs)
	Exchange the contents of two AutoDispose objects.
const Dispose &	getDispose () const
	Return the current dispose function.
void	setDispose (const Dispose &dispose_r)
	Set a new dispose function.
void	resetDispose ()
	Set nodispose function.
void	swapDispose (Dispose &dispose_r)
	Exchange the dispose function.
Static Public Member Functions
static void	nodispose (param_type)
	Noop dispose function.
Private Attributes
shared_ptr< Impl >	_pimpl
Related Functions
(Note that these are not member functions.)
std::ostream &	operator<< (std::ostream &str, const AutoDispose< _Tp > &obj)
Classes
struct	Impl

zypp::AutoDispose< _Tp > Class Template Reference

Public Types

Public Member Functions

Static Public Member Functions

Private Attributes

Related Functions

Classes