std::shared_ptr<T>::operator= (3) - Linux Man Pages

std::shared_ptr<T>::operator=: std::shared_ptr<T>::operator=

NAME

std::shared_ptr<T>::operator= - std::shared_ptr<T>::operator=

Synopsis


shared_ptr& operator=( const shared_ptr& r ) noexcept; (1)
template< class Y > (1)
shared_ptr& operator=( const shared_ptr<Y>& r ) noexcept;
shared_ptr& operator=( shared_ptr&& r ) noexcept; (2)
template< class Y > (2)
shared_ptr& operator=( shared_ptr<Y>&& r ) noexcept;
template< class Y > (3) (deprecated in C++11)
shared_ptr& operator=( std::auto_ptr<Y>&& r ); (removed in C++17)
template< class Y, class Deleter > (4)
shared_ptr& operator=( std::unique_ptr<Y,Deleter>&& r );


Replaces the managed object with the one managed by r.
If *this already owns an object and it is the last shared_ptr owning it, and r is not the same as *this, the object is destroyed through the owned deleter.
1) Shares ownership of the object managed by r. If r manages no object, *this manages no object too. Equivalent to shared_ptr<T>(r).swap(*this).
2) Move-assigns a shared_ptr from r. After the assignment, *this contains a copy of the previous state of r, and r is empty. Equivalent to shared_ptr<T>(std::move(r)).swap(*this).
3) Transfers the ownership of the object managed by r to *this. If r manages no object, *this manages no object too. After the assignment, *this contains the pointer previously held by r, and use_count()==1; also r is empty. Equivalent to shared_ptr<T>(r).swap(*this).
4) Transfers the ownership of the object managed by r to *this. The deleter associated to r is stored for future deletion of the managed object. r manages no object after the call. Equivalent to shared_ptr<T>(std::move(r)).swap(*this).

Parameters


r - another smart pointer to share the ownership to or acquire the ownership from

Return value


*this

Notes


The implementation may meet the requirements without creating a temporary shared_ptr object.

Exceptions


3) (none)
4) may throw exception

Example


 This section is incomplete
 Reason: no example

See also


      replaces the managed object
reset (public member function)