A simple smart pointer providing strict ownership semantics. More...
A simple smart pointer providing strict ownership semantics.
The Standard says:
Anauto_ptrowns the object it holds a pointer to. Copying anauto_ptrcopies the pointer and transfers ownership to the destination. If more than oneauto_ptrowns the same object at the same time the behavior of the program is undefined.
The uses ofauto_ptrinclude providing temporary exception-safety for dynamically allocated memory, passing ownership of dynamically allocated memory to a function, and returning dynamically allocated memory from a function.auto_ptrdoes not meet the CopyConstructible and Assignable requirements for Standard Library container elements and thus instantiating a Standard Library container with anauto_ptrresults in undefined behavior.
Quoted from [20.4.5]/3.
Good examples of what can and cannot be done with auto_ptr can be found in the libstdc++ testsuite.
_GLIBCXX_RESOLVE_LIB_DEFECTS 127. auto_ptr<> conversion issues These resolutions have all been incorporated.
Definition at line 87 of file auto_ptr.h.
| typedef _Tp std::auto_ptr< _Tp >::element_type |
The pointed-to type.
Definition at line 94 of file auto_ptr.h.
| std::auto_ptr< _Tp >::auto_ptr | ( | element_type * | __p = 0 |
) | throw () [inline, explicit] |
An auto_ptr is usually constructed from a raw pointer.
| p | A pointer (defaults to NULL). |
This object now owns the object pointed to by p.
Definition at line 103 of file auto_ptr.h.
| std::auto_ptr< _Tp >::auto_ptr | ( | auto_ptr< _Tp > & | __a | ) | throw () [inline] |
An auto_ptr can be constructed from another auto_ptr.
| a | Another auto_ptr of the same type. |
This object now owns the object previously owned by a, which has given up ownership.
Definition at line 112 of file auto_ptr.h.
| std::auto_ptr< _Tp >::auto_ptr | ( | auto_ptr< _Tp1 > & | __a | ) | throw () [inline] |
An auto_ptr can be constructed from another auto_ptr.
| a | Another auto_ptr of a different but related type. |
A pointer-to-Tp1 must be convertible to a pointer-to-Tp/element_type.
This object now owns the object previously owned by a, which has given up ownership.
Definition at line 125 of file auto_ptr.h.
| std::auto_ptr< _Tp >::~auto_ptr | ( | ) | [inline] |
When the auto_ptr goes out of scope, the object it owns is deleted. If it no longer owns anything (i.e., get() is NULL), then this has no effect.
The C++ standard says there is supposed to be an empty throw specification here, but omitting it is standard conforming. Its presence can be detected only if _Tp::~_Tp() throws, but this is prohibited. [17.4.3.6]/2
Definition at line 170 of file auto_ptr.h.
| std::auto_ptr< _Tp >::auto_ptr | ( | auto_ptr_ref< element_type > | __ref | ) | throw () [inline] |
Automatic conversions.
These operations convert an auto_ptr into and from an auto_ptr_ref automatically as needed. This allows constructs such as
auto_ptr<Derived> func_returning_auto_ptr(.....);
...
auto_ptr<Base> ptr = func_returning_auto_ptr(.....);
Definition at line 260 of file auto_ptr.h.
| element_type* std::auto_ptr< _Tp >::get | ( | void | ) | const throw () [inline] |
Bypassing the smart pointer.
You can get a copy of the pointer that this object owns, for situations such as passing to a function which only accepts a raw pointer.
Definition at line 211 of file auto_ptr.h.
| element_type& std::auto_ptr< _Tp >::operator* | ( | ) | const throw () [inline] |
Smart pointer dereferencing.
If this auto_ptr no longer owns anything, then this operation will crash. (For a smart pointer, no longer owns anything is the same as being a null pointer, and you know what happens when you dereference one of those...)
Definition at line 181 of file auto_ptr.h.
| element_type* std::auto_ptr< _Tp >::operator-> | ( | ) | const throw () [inline] |
Smart pointer dereferencing.
This returns the pointer itself, which the language then will automatically cause to be dereferenced.
Definition at line 194 of file auto_ptr.h.
| auto_ptr& std::auto_ptr< _Tp >::operator= | ( | auto_ptr< _Tp1 > & | __a | ) | throw () [inline] |
auto_ptr assignment operator.
| a | Another auto_ptr of a different but related type. |
A pointer-to-Tp1 must be convertible to a pointer-to-Tp/element_type.
This object now owns the object previously owned by a, which has given up ownership. The object that this one used to own and track has been deleted.
Definition at line 154 of file auto_ptr.h.
References std::auto_ptr< _Tp >::reset().
| auto_ptr& std::auto_ptr< _Tp >::operator= | ( | auto_ptr< _Tp > & | __a | ) | throw () [inline] |
auto_ptr assignment operator.
| a | Another auto_ptr of the same type. |
This object now owns the object previously owned by a, which has given up ownership. The object that this one used to own and track has been deleted.
Definition at line 136 of file auto_ptr.h.
References std::auto_ptr< _Tp >::reset().
| element_type* std::auto_ptr< _Tp >::release | ( | ) | throw () [inline] |
Bypassing the smart pointer.
You can get a copy of the pointer that this object owns, for situations such as passing to a function which only accepts a raw pointer.
Definition at line 225 of file auto_ptr.h.
| void std::auto_ptr< _Tp >::reset | ( | element_type * | __p = 0 |
) | throw () [inline] |
Forcibly deletes the managed object.
| p | A pointer (defaults to NULL). |
This object now owns the object pointed to by p. The previous object has been deleted.
Definition at line 240 of file auto_ptr.h.
Referenced by std::auto_ptr< _Tp >::operator=().
1.7.1