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Showing content from https://en.cppreference.com/w/cpp/algorithm/../language/../memory/auto_ptr/operator=.html below:

std::auto_ptr<T>::operator= - cppreference.com

auto_ptr& operator=( auto_ptr& r ) throw();

template< class Y >
auto_ptr& operator=( auto_ptr<Y>& r ) throw();

auto_ptr& operator=( auto_ptr_ref<T> m ) throw();

Replaces the managed object with the one managed by r or m.

1) Effectively calls reset(r.release()).

2) Effectively calls reset(r.release()). Y* must be implicitly convertible to T*.

Effectively calls

.

is an implementation-defined type that holds a reference to

.

is implicitly

and

this type. The implementation is allowed to provide the template with a different name or implement equivalent functionality in other ways.

*this.

The constructor and the copy assignment operator from auto_ptr_ref is provided to allow copy-constructing and assigning std::auto_ptr from nameless temporaries. Since its copy constructor and copy assignment operator take the argument as non-const reference, they cannot bind rvalue arguments directly. However, a user-defined conversion can be executed (which releases the original auto_ptr), followed by a call to the constructor or copy-assignment operator that take auto_ptr_ref by value. This is an early implementation of move semantics.

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

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