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std::shared_ptr<T>::operator=

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

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

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

3-4) May throw implementation-defined exceptions.