ACE::Value_Ptr< T > Class Template Reference

Smart pointer implementation designed for use as a class member. More...

#include <Value_Ptr.h>

Collaboration diagram for ACE::Value_Ptr< T >:

[legend]List of all members.

Public Member Functions
	Value_Ptr (T *p=0)
	Constructor.
	~Value_Ptr (void)
	Destructor.
T &	operator * (void) const
	Deference operator.
T *	operator-> (void) const
	Pointer operator.
void	swap (Value_Ptr &other)
	Value_Ptr (Value_Ptr const &other)
	Copy constructor.
Value_Ptr &	operator= (Value_Ptr const &other)
	Assignment operator.
template<typename U>	Value_Ptr (Value_Ptr< U > const &other)
	Converting copy constructor.
template<typename U> Value_Ptr &	operator= (Value_Ptr< U > const &other)
	Converting assignment operator.
Private Member Functions
template<typename U> T *	create_from (U const *p) const
	Copying method invoked when copy constructing.
Private Attributes
T *	p_
	Object owned by this Value_Ptr.
Friends
class	Value_Ptr

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Detailed Description

template<typename T>
class ACE::Value_Ptr< T >

Smart pointer implementation designed for use as a class member.

Using a std::auto_ptr<> as a class member is sometimes problematic since ownership of memory is transferred when copying such members. This Value_Ptr class is explicitly designed to avoid such problems by performing copies of the underlying object rather than transfer ownership. This, for example, allows it to be readily used as a member in classes placed inside STL containers.

See also:

Item 31 in "More Exceptional C++" by Herb Sutter.

Definition at line 67 of file Value_Ptr.h.

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Constructor & Destructor Documentation

template<typename T> ACE::Value_Ptr< T >::Value_Ptr (  T *  p = 0  )  [inline, explicit]

Constructor. Definition at line 72 of file Value_Ptr.h. : p_ (p) { }

template<typename T> ACE::Value_Ptr< T >::~Value_Ptr (  void   )  [inline]

Destructor. Definition at line 75 of file Value_Ptr.h. { delete this->p_; }

template<typename T> ACE::Value_Ptr< T >::Value_Ptr (  Value_Ptr< T > const &  other  )  [inline]

Copy constructor. Definition at line 94 of file Value_Ptr.h. References ACE::Value_Ptr< T >::create_from(). : p_ (create_from (other.p_)) { }

template<typename T> template<typename U> ACE::Value_Ptr< T >::Value_Ptr (  Value_Ptr< U > const &  other  )  [inline]

Converting copy constructor. Definition at line 113 of file Value_Ptr.h. References ACE::Value_Ptr< T >::create_from(). : p_ (create_from (other.p_)) { }

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Member Function Documentation

template<typename T> template<typename U> T* ACE::Value_Ptr< T >::create_from (  U const *  p  )  const [inline, private]

Copying method invoked when copy constructing. Definition at line 134 of file Value_Ptr.h. Referenced by ACE::Value_Ptr< T >::Value_Ptr(). { return p ? VP_traits<U>::clone (p) : 0; }

template<typename T> T& ACE::Value_Ptr< T >::operator * (  void   )  const [inline]

Deference operator. Definition at line 78 of file Value_Ptr.h. { return *this->p_; }

template<typename T> T* ACE::Value_Ptr< T >::operator-> (  void   )  const [inline]

Pointer operator. Definition at line 81 of file Value_Ptr.h. { return this->p_; }

template<typename T> template<typename U> Value_Ptr& ACE::Value_Ptr< T >::operator= (  Value_Ptr< U > const &  other  )  [inline]

Converting assignment operator. Definition at line 118 of file Value_Ptr.h. References ACE::Value_Ptr< T >::swap(). { // Strongly exception-safe. Value_Ptr temp (other); this->swap (temp); return *this; }

template<typename T> Value_Ptr& ACE::Value_Ptr< T >::operator= (  Value_Ptr< T > const &  other  )  [inline]

Assignment operator. Definition at line 98 of file Value_Ptr.h. References ACE::Value_Ptr< T >::swap(). { // Strongly exception-safe. Value_Ptr temp (other); this->swap (temp); return *this; }

template<typename T> void ACE::Value_Ptr< T >::swap (  Value_Ptr< T > &  other  )  [inline]

Note: As implemented, the swap operation may not work correctly for auto_ptr<>s, but why would one use an auto_ptr<> as the template argument for this particular template class!? Definition at line 91 of file Value_Ptr.h. References ACE::Value_Ptr< T >::p_. Referenced by ACE::Value_Ptr< T >::operator=(). { std::swap (this->p_, other.p_); }

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Friends And Related Function Documentation

template<typename T> friend class Value_Ptr [friend]

Definition at line 155 of file Value_Ptr.h.

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Member Data Documentation

template<typename T> T* ACE::Value_Ptr< T >::p_ [private]

Object owned by this Value_Ptr. Definition at line 159 of file Value_Ptr.h. Referenced by ACE::Value_Ptr< T >::swap().

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

• Value_Ptr.h

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