explicit auto_ptr( X* p = 0 );
auto_ptr( auto_ptr& r );
template< class Y >
auto_ptr( auto_ptr<Y>& r );
auto_ptr( auto_ptr_ref<X> m );
auto_ptr from a pointer that refers to the object to manage.
auto_ptrwith the pointer held in
r. r.release() is called to acquire the ownership of the object.
auto_ptrwith the pointer held in the
auto_ptrinstance referred to by
m. p.release() is called for the
mholds to acquire the ownership of the object.
auto_ptr_refis an implementation-defined type that holds a reference to
auto_ptr. std::auto_ptr is implicitly convertible to and assignable from this type. The implementation is allowed to provide the template with a different name or implement equivalent functionality in other ways.
|p||-||a pointer to an object to manage|
|r||-|| another |
|m||-|| an implementation-defined type that holds a reference to |
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.