std::auto_ptr<T>::auto_ptr
Defined in header <memory>
.
explicit auto_ptr( X* p = 0 ) throw(); (1)
auto_ptr( auto_ptr& r ) throw(); (2)
template< class Y >
auto_ptr( auto_ptr<Y>& r ) throw(); (3)
auto_ptr( auto_ptr_ref<X> m ) throw(); (4)
Constructs the auto_ptr from a pointer that refers to the object to manage.
-
Constructs the auto_ptr with pointer
p
. -
Constructs the auto_ptr with the pointer held in
r
.r.release()
is called to acquire the ownership of the object. -
Same as (2).
Y*
must be implicitly convertible toT*
. -
Constructs the auto_ptr with the pointer held in the auto_ptr instance referred to by
m
.p.release()
is called for the auto_ptrp
thatm
holds to acquire the ownership of the object. auto_ptr_ref is 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.
Parameters
p
- a pointer to an object to manage
r
- another auto_ptr to transfer the ownership of the object from
m
- an implementation-defined type that holds a reference to auto_ptr
Notes
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 std::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.