|
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
explicit auto_ptr( X* p=0)throw(); | (1) | (deprecated in C++11) (removed in C++17) |
auto_ptr( auto_ptr& r)throw(); | (2) | (deprecated in C++11) (removed in C++17) |
template<class Y> auto_ptr( auto_ptr<Y>& r)throw(); | (3) | (deprecated in C++11) (removed in C++17) |
auto_ptr( auto_ptr_ref<X> m)throw(); | (4) | (deprecated in C++11) (removed in C++17) |
Constructs theauto_ptr from a pointer that refers to the object to manage.
auto_ptr with pointerp.auto_ptr with the pointer held inr.r.release() is called to acquire the ownership of the object.auto_ptr with the pointer held in theauto_ptr instance referred to bym.p.release() is called for theauto_ptr p thatm holds to acquire the ownership of the object.auto_ptr_ref is an implementation-defined type that holds a reference toauto_ptr.std::auto_ptr is implicitlyconvertible to andassignable 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 | - | anotherauto_ptr to transfer the ownership of the object from |
| m | - | an implementation-defined type that holds a reference toauto_ptr |
The constructor and the copy assignment operator fromauto_ptr_ref is provided to allow copy-constructing and assigningstd::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, auser-defined conversion can be executed (which releases the originalauto_ptr), followed by a call to the constructor or copy-assignment operator that takeauto_ptr_ref by value. This is an early implementation ofmove semantics.
