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std_shared_ptr.3cxx

NAME

std::shared_ptr -

A smart pointer with reference-counted copy semantics.

SYNOPSIS

Inherits __shared_ptr< _Tp >.

Public Member Functions

shared_ptr ()

template<typename _Tp1 > shared_ptr (_Tp1 *__p)

template<typename _Tp1 , typename _Deleter , typename _Alloc > shared_ptr (_Tp1 *__p, _Deleter __d, const _Alloc &__a)

template<typename _Tp1 > shared_ptr (shared_ptr< _Tp1 > &&__r)

template<typename _Tp1 > shared_ptr (const weak_ptr< _Tp1 > &__r)

template<typename _Tp1 > shared_ptr (const shared_ptr< _Tp1 > &__r, _Tp *__p)

template<typename _Tp1 > shared_ptr (std::auto_ptr< _Tp1 > &&__r)

template<typename _Tp1 , typename _Del > shared_ptr (std::unique_ptr< _Tp1, _Del > &&__r)

template<typename _Tp1 , typename _Deleter > shared_ptr (_Tp1 *__p, _Deleter __d)

template<typename _Tp1 > shared_ptr (const shared_ptr< _Tp1 > &__r)

shared_ptr (shared_ptr &&__r)

template<class _Tp1 > shared_ptr & operator= (shared_ptr< _Tp1 > &&__r)

template<typename _Tp1 > shared_ptr & operator= (const shared_ptr< _Tp1 > &__r)

shared_ptr & operator= (shared_ptr &&__r)

template<typename _Tp1 , typename _Del > shared_ptr & operator= (std::unique_ptr< _Tp1, _Del > &&__r)

template<typename _Tp1 > shared_ptr & operator= (std::auto_ptr< _Tp1 > &&__r)

Friends

template<typename _Tp1 , typename _Alloc , typename... _Args> shared_ptr< _Tp1 > allocate_shared (_Alloc __a, _Args &&...__args)

Detailed Description

template<typename _Tp> class std::shared_ptr< _Tp >

A smart pointer with reference-counted copy semantics.

The object pointed to is deleted when the last shared_ptr pointing to it is destroyed or reset.

Definition at line 91 of file shared_ptr.h.

Constructor & Destructor Documentation

template<typename _Tp> std::shared_ptr< _Tp >::shared_ptr () [inline]

Construct an empty shared_ptr. Postcondition:

use_count()==0 && get()==0

Definition at line 98 of file shared_ptr.h.

template<typename _Tp> template<typename _Tp1 > std::shared_ptr< _Tp >::shared_ptr (_Tp1 * __p) [inline, explicit]

Construct a shared_ptr that owns the pointer __p. Parameters:

__p A pointer that is convertible to element_type*.

Postcondition:

use_count() == 1 && get() == __p

Exceptions:

std::bad_alloc,in which case delete __p is called.

Definition at line 107 of file shared_ptr.h.

template<typename _Tp> template<typename _Tp1 , typename _Deleter > std::shared_ptr< _Tp >::shared_ptr (_Tp1 * __p, _Deleter __d) [inline]

Construct a shared_ptr that owns the pointer __p and the deleter __d. Parameters:

__p A pointer.
__d A deleter.

Postcondition:

use_count() == 1 && get() == __p

Exceptions:

std::bad_alloc,in which case __d(__p) is called.

Requirements: _Deleter's copy constructor and destructor must not throw

__shared_ptr will release __p by calling __d(__p)

Definition at line 123 of file shared_ptr.h.

template<typename _Tp> template<typename _Tp1 , typename _Deleter , typename _Alloc > std::shared_ptr< _Tp >::shared_ptr (_Tp1 * __p, _Deleter __d, const _Alloc & __a) [inline]

Construct a shared_ptr that owns the pointer __p and the deleter __d. Parameters:

__p A pointer.
__d A deleter.
__a An allocator.

Postcondition:

use_count() == 1 && get() == __p

Exceptions:

std::bad_alloc,in which case __d(__p) is called.

Requirements: _Deleter's copy constructor and destructor must not throw _Alloc's copy constructor and destructor must not throw.

__shared_ptr will release __p by calling __d(__p)

Definition at line 141 of file shared_ptr.h.

template<typename _Tp> template<typename _Tp1 > std::shared_ptr< _Tp >::shared_ptr (const shared_ptr< _Tp1 > & __r, _Tp * __p) [inline]

Constructs a shared_ptr instance that stores __p and shares ownership with __r. Parameters:

__r A shared_ptr.
__p A pointer that will remain valid while *__r is valid.

Postcondition:

get() == __p && use_count() == __r.use_count()

This can be used to construct a shared_ptr to a sub-object of an object managed by an existing shared_ptr.

  shared_ptr< pair<int,int> > pii(new pair<int,int>());
  shared_ptr<int> pi(pii, &pii->first);
  assert(pii.use_count() == 2);
 

 

Definition at line 163 of file shared_ptr.h.

template<typename _Tp> template<typename _Tp1 > std::shared_ptr< _Tp >::shared_ptr (const shared_ptr< _Tp1 > & __r) [inline]

If __r is empty, constructs an empty shared_ptr; otherwise construct a shared_ptr that shares ownership with __r. Parameters:

__r A shared_ptr.

Postcondition:

get() == __r.get() && use_count() == __r.use_count()

Definition at line 174 of file shared_ptr.h.

template<typename _Tp> std::shared_ptr< _Tp >::shared_ptr (shared_ptr< _Tp > && __r) [inline]

Move-constructs a shared_ptr instance from __r. Parameters:

__r A shared_ptr rvalue.

Postcondition:

*this contains the old value of __r, __r is empty.

Definition at line 181 of file shared_ptr.h.

template<typename _Tp> template<typename _Tp1 > std::shared_ptr< _Tp >::shared_ptr (shared_ptr< _Tp1 > && __r) [inline]

Move-constructs a shared_ptr instance from __r. Parameters:

__r A shared_ptr rvalue.

Postcondition:

*this contains the old value of __r, __r is empty.

Definition at line 190 of file shared_ptr.h.

template<typename _Tp> template<typename _Tp1 > std::shared_ptr< _Tp >::shared_ptr (const weak_ptr< _Tp1 > & __r) [inline, explicit]

Constructs a shared_ptr that shares ownership with __r and stores a copy of the pointer stored in __r. Parameters:

__r A weak_ptr.

Postcondition:

use_count() == __r.use_count()

Exceptions:

bad_weak_ptr when __r.expired(), in which case the constructor has no effect.

Definition at line 202 of file shared_ptr.h.

Friends And Related Function Documentation

template<typename _Tp> template<typename _Tp1 , typename _Alloc , typename... _Args> shared_ptr<_Tp1> allocate_shared (_Alloc __a, _Args &&... __args) [friend]

Create an object that is owned by a shared_ptr. Parameters:

__a An allocator.
__args Arguments for the _Tp object's constructor.

Returns:

A shared_ptr that owns the newly created object.

Exceptions:

An exception thrown from _Alloc::allocate or from the constructor of _Tp.

A copy of __a will be used to allocate memory for the shared_ptr and the new object.

Definition at line 452 of file shared_ptr.h.

Author

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