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

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

explicit auto_ptr( X* p = 0 ) throw();

auto_ptr( auto_ptr& r ) throw();

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

auto_ptr( auto_ptr_ref<X> m ) throw();

Constructs the auto_ptr from a pointer that refers to the object to manage.

1) Constructs the auto_ptr with pointer p.

2) Constructs the auto_ptr with the pointer held in r. r.release() is called to acquire the ownership of the object.

3) Same as (2). Y* must be implicitly convertible to T*.

4) Constructs the auto_ptr with the pointer held in the auto_ptr instance referred to by m. p.release() is called for the auto_ptr p that m holds to acquire the ownership of the object.

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.

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.

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