std::shared_ptr - Man Page

using element_type
The type pointed to by the stored pointer, remove_extent_t<_Tp>
using weak_type
The corresponding weak_ptr type for this shared_ptr.

constexpr shared_ptr () noexcept
Construct an empty shared_ptr.
template<typename _Yp , typename  = _Constructible<_Yp*>> shared_ptr (_Yp *__p)
Construct a shared_ptr that owns the pointer __p.
template<typename _Yp , typename _Deleter , typename  = _Constructible<_Yp*, _Deleter>> shared_ptr (_Yp *__p, _Deleter __d)
Construct a shared_ptr that owns the pointer __p and the deleter __d.
template<typename _Yp , typename _Deleter , typename _Alloc , typename  = _Constructible<_Yp*, _Deleter, _Alloc>> shared_ptr (_Yp *__p, _Deleter __d, _Alloc __a)
Construct a shared_ptr that owns the pointer __p and the deleter __d.
template<typename _Yp , typename  = _Constructible<auto_ptr<_Yp>>> shared_ptr (auto_ptr< _Yp > &&__r)
shared_ptr (const shared_ptr &) noexcept=default
Copy constructor.
template<typename _Yp , typename  = _Constructible<const shared_ptr<_Yp>&>> shared_ptr (const shared_ptr< _Yp > &__r) noexcept
If __r is empty, constructs an empty shared_ptr; otherwise construct a shared_ptr that shares ownership with __r.
template<typename _Yp > shared_ptr (const shared_ptr< _Yp > &__r, element_type *__p) noexcept
Constructs a shared_ptr instance that stores __p and shares ownership with __r.
template<typename _Yp , typename  = _Constructible<const weak_ptr<_Yp>&>> shared_ptr (const weak_ptr< _Yp > &__r)
Constructs a shared_ptr that shares ownership with __r and stores a copy of the pointer stored in __r.
template<typename _Deleter > shared_ptr (nullptr_t __p, _Deleter __d)
Construct a shared_ptr that owns a null pointer and the deleter __d.
template<typename _Deleter , typename _Alloc > shared_ptr (nullptr_t __p, _Deleter __d, _Alloc __a)
Construct a shared_ptr that owns a null pointer and the deleter __d.
constexpr shared_ptr (nullptr_t) noexcept
Construct an empty shared_ptr.
shared_ptr (shared_ptr &&__r) noexcept
Move-constructs a shared_ptr instance from __r.
template<typename _Yp , typename  = _Constructible<shared_ptr<_Yp>>> shared_ptr (shared_ptr< _Yp > &&__r) noexcept
Move-constructs a shared_ptr instance from __r.
template<typename _Yp > shared_ptr (shared_ptr< _Yp > &&__r, element_type *__p) noexcept
Constructs a shared_ptr instance that stores __p and shares ownership with __r.
template<typename _Tp1 , typename > shared_ptr (std::auto_ptr< _Tp1 > &&__r)
template<typename _Yp , typename _Del , typename  = _Constructible<unique_ptr<_Yp, _Del>>> shared_ptr (unique_ptr< _Yp, _Del > &&__r)
element_type * get () const noexcept
Return the stored pointer.
operator bool () const noexcept
Return true if the stored pointer is not null.
element_type & operator* () const noexcept
element_type * operator-> () const noexcept
template<typename _Yp > _Assignable< auto_ptr< _Yp > > operator= (auto_ptr< _Yp > &&__r)
shared_ptr & operator= (const shared_ptr &) noexcept=default
template<typename _Yp > _Assignable< const shared_ptr< _Yp > & > operator= (const shared_ptr< _Yp > &__r) noexcept
shared_ptr & operator= (shared_ptr &&__r) noexcept
template<class _Yp > _Assignable< shared_ptr< _Yp > > operator= (shared_ptr< _Yp > &&__r) noexcept
template<typename _Yp , typename _Del > _Assignable< unique_ptr< _Yp, _Del > > operator= (unique_ptr< _Yp, _Del > &&__r)
void reset () noexcept
template<typename _Yp > _SafeConv< _Yp > reset (_Yp *__p)
template<typename _Yp , typename _Deleter > _SafeConv< _Yp > reset (_Yp *__p, _Deleter __d)
template<typename _Yp , typename _Deleter , typename _Alloc > _SafeConv< _Yp > reset (_Yp *__p, _Deleter __d, _Alloc __a)
void swap (__shared_ptr< _Tp, _Lp > &__other) noexcept
Exchange both the owned pointer and the stored pointer.
bool unique () const noexcept
Return true if use_count() == 1.
long use_count () const noexcept
If *this owns a pointer, return the number of owners, otherwise zero.

template<typename _Tp1 > bool owner_before (__shared_ptr< _Tp1, _Lp > const &__rhs) const noexcept
Define an ordering based on ownership.
template<typename _Tp1 > bool owner_before (__weak_ptr< _Tp1, _Lp > const &__rhs) const noexcept
Define an ordering based on ownership.

template<typename _Yp , typename _Alloc > shared_ptr< _BoundedArray< _Yp > > allocate_shared (const _Alloc &)
template<typename _Yp , typename _Alloc , typename... _Args> shared_ptr< _NonArray< _Yp > > allocate_shared (const _Alloc &, _Args &&...)
template<typename _Yp , typename _Alloc > shared_ptr< _BoundedArray< _Yp > > allocate_shared (const _Alloc &, const remove_extent_t< _Yp > &)
template<typename _Yp , typename _Alloc > shared_ptr< _UnboundedArray< _Yp > > allocate_shared (const _Alloc &, size_t)
template<typename _Yp , typename _Alloc > shared_ptr< _UnboundedArray< _Yp > > allocate_shared (const _Alloc &, size_t, const remove_extent_t< _Yp > &)
template<typename _Yp , typename _Alloc > shared_ptr< _NotUnboundedArray< _Yp > > allocate_shared_for_overwrite (const _Alloc &)
template<typename _Yp , typename _Alloc > shared_ptr< _UnboundedArray< _Yp > > allocate_shared_for_overwrite (const _Alloc &, size_t)
template<typename _Yp > shared_ptr< _BoundedArray< _Yp > > make_shared ()
template<typename _Yp , typename... _Args> shared_ptr< _NonArray< _Yp > > make_shared (_Args &&...)
template<typename _Yp > shared_ptr< _BoundedArray< _Yp > > make_shared (const remove_extent_t< _Yp > &)
template<typename _Yp > shared_ptr< _UnboundedArray< _Yp > > make_shared (size_t)
template<typename _Yp > shared_ptr< _UnboundedArray< _Yp > > make_shared (size_t, const remove_extent_t< _Yp > &)
template<typename _Yp > shared_ptr< _NotUnboundedArray< _Yp > > make_shared_for_overwrite ()
template<typename _Yp > shared_ptr< _UnboundedArray< _Yp > > make_shared_for_overwrite (size_t)
class weak_ptr< _Tp >

(Note that these are not member symbols.)

template<typename _Del , typename _Tp > _Del * get_deleter (const shared_ptr< _Tp > &__p) noexcept
20.7.2.2.10 shared_ptr get_deleter
template<typename _Ch , typename _Tr , typename _Tp , _Lock_policy _Lp> std::basic_ostream< _Ch, _Tr > & operator<< (std::basic_ostream< _Ch, _Tr > &__os, const __shared_ptr< _Tp, _Lp > &__p)
Write the stored pointer to an ostream.

template<typename _Tp , typename _Up > bool operator== (const shared_ptr< _Tp > &__a, const shared_ptr< _Up > &__b) noexcept
template<typename _Tp > bool operator== (const shared_ptr< _Tp > &__a, nullptr_t) noexcept
shared_ptr comparison with nullptr
template<typename _Tp > void swap (shared_ptr< _Tp > &__a, shared_ptr< _Tp > &__b) noexcept
Swap overload for shared_ptr.
template<typename _Tp , typename _Up > shared_ptr< _Tp > static_pointer_cast (const shared_ptr< _Up > &__r) noexcept
Convert type of shared_ptr, via static_cast
template<typename _Tp , typename _Up > shared_ptr< _Tp > const_pointer_cast (const shared_ptr< _Up > &__r) noexcept
Convert type of shared_ptr, via const_cast
template<typename _Tp , typename _Up > shared_ptr< _Tp > dynamic_pointer_cast (const shared_ptr< _Up > &__r) noexcept
Convert type of shared_ptr, via dynamic_cast
template<typename _Tp , typename _Up > shared_ptr< _Tp > reinterpret_pointer_cast (const shared_ptr< _Up > &__r) noexcept
Convert type of shared_ptr, via reinterpret_cast
template<typename _Tp , typename _Up > shared_ptr< _Tp > static_pointer_cast (shared_ptr< _Up > &&__r) noexcept
Convert type of shared_ptr rvalue, via static_cast
template<typename _Tp , typename _Up > shared_ptr< _Tp > const_pointer_cast (shared_ptr< _Up > &&__r) noexcept
Convert type of shared_ptr rvalue, via const_cast
template<typename _Tp , typename _Up > shared_ptr< _Tp > dynamic_pointer_cast (shared_ptr< _Up > &&__r) noexcept
Convert type of shared_ptr rvalue, via dynamic_cast
template<typename _Tp , typename _Up > shared_ptr< _Tp > reinterpret_pointer_cast (shared_ptr< _Up > &&__r) noexcept
Convert type of shared_ptr rvalue, via reinterpret_cast

template<typename _Tp , typename _Alloc , typename... _Args> shared_ptr< _NonArray< _Tp > > allocate_shared (const _Alloc &__a, _Args &&... __args)
Create an object that is owned by a shared_ptr.
template<typename _Tp , typename... _Args> shared_ptr< _NonArray< _Tp > > make_shared (_Args &&... __args)
Create an object that is owned by a shared_ptr.
template<typename _Tp , typename _Alloc > shared_ptr< _UnboundedArray< _Tp > > allocate_shared (const _Alloc &__a, size_t __n)
Create an object that is owned by a shared_ptr.
template<typename _Tp , typename _Alloc > shared_ptr< _BoundedArray< _Tp > > allocate_shared (const _Alloc &__a)
Create an object that is owned by a shared_ptr.

class std::shared_ptr< _Tp >"A smart pointer with reference-counted copy semantics.

Since

C++11

A shared_ptr object is either empty or owns a pointer passed to the constructor. Copies of a shared_ptr share ownership of the same pointer. When the last shared_ptr that owns the pointer is destroyed or reset, the owned pointer is freed (either by delete or by invoking a custom deleter that was passed to the constructor).

A shared_ptr also stores another pointer, which is usually (but not always) the same pointer as it owns. The stored pointer can be retrieved by calling the get() member function.

The equality and relational operators for shared_ptr only compare the stored pointer returned by get(), not the owned pointer. To test whether two shared_ptr objects share ownership of the same pointer see std::shared_ptr::owner_before and std::owner_less.

The type pointed to by the stored pointer, remove_extent_t<_Tp>

The corresponding weak_ptr type for this shared_ptr.

Since

C++17

Construct an empty shared_ptr.

Postcondition

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

Copy constructor.

Construct a shared_ptr that owns the pointer __p.

Parameters

Postcondition

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

Exceptions

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

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

Parameters

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)

Construct a shared_ptr that owns a null pointer and the deleter __d.

Parameters

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

The last owner will call __d(__p)

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

Parameters

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)

Construct a shared_ptr that owns a null pointer and the deleter __d.

Parameters

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.

The last owner will call __d(__p)

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

Parameters

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. The complete object will remain valid while any shared_ptr owns it, even if they don't store a pointer to the complete object.

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

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

Parameters

Postcondition

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

Since

C++17

This can be used to construct a shared_ptr to a sub-object of an object managed by an existing shared_ptr. The complete object will remain valid while any shared_ptr owns it, even if they don't store a pointer to the complete object.

shared_ptr<pair<int,int>> pii(new pair<int,int>());
shared_ptr<int> pi1(pii, &pii->first);
assert(pii.use_count() == 2);
shared_ptr<int> pi2(std::move(pii), &pii->second);
assert(pii.use_count() == 0);

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

Parameters

Postcondition

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

Move-constructs a shared_ptr instance from __r.

Parameters

Postcondition

Move-constructs a shared_ptr instance from __r.

Parameters

Postcondition

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

Parameters

Postcondition

use_count() == __r.use_count()

Exceptions

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

Construct an empty shared_ptr.

Postcondition

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

Return the stored pointer.

Return true if the stored pointer is not null.

Define an ordering based on ownership. This function defines a strict weak ordering between two shared_ptr or weak_ptr objects, such that one object is less than the other unless they share ownership of the same pointer, or are both empty.

Define an ordering based on ownership. This function defines a strict weak ordering between two shared_ptr or weak_ptr objects, such that one object is less than the other unless they share ownership of the same pointer, or are both empty.

Exchange both the owned pointer and the stored pointer.

Return true if use_count() == 1.

If *this owns a pointer, return the number of owners, otherwise zero.