# std::inout_ptr_t<Smart,Pointer,Args...>::~inout_ptr_t

From cppreference.com
< cpp‎ | memory‎ | inout ptr t

~inout_ptr_t(); |  | (since C++23)

Resets the adapted `Smart` object by the value of modified `Pointer` object (or the void* object if operator void**() has been called) and the captured arguments. release() may be called on the adapted `Smart` object if it is not called by the constructor.

Let

- `s` denotes the adapted `Smart` object,
- `args...` denotes the captured arguments,
- `p` denotes the value of stored `Pointer`, or static_cast<Pointer>(*operator void**()) if operator void** has been called,
- `SP` be
  - Smart::pointer, if it is valid and denotes a type, otherwise,
  - Smart::element_type*, if Smart::element_type is valid and denotes a type, otherwise,
  - std::pointer_traits <Smart>::element_type*, if std::pointer_traits <Smart>::element_type is valid and denotes a type, otherwise,
  - `Pointer`,
- /*do-release*/ denotes s.release() if the constructor does not call release(), empty otherwise.

If `Smart` is a pointer type, the destructor performs

  s = static_cast<Smart>(p);, and the program is ill-formed if sizeof...(Args) > 0;

otherwise, if s.reset(static_cast<SP>(p), std::forward <Args>(args)...) is well-formed, the destructor performs

  /*do-release*/; if (p) { s.reset(static_cast<SP>(p), std::forward <Args>(args)...); };

otherwise, if std::is_constructible_v <Smart, SP, Args...> is true, the destructor performs

  /*do-release*/; if (p) { s = Smart(static_cast<SP>(p), std::forward <Args>(args)...); };

otherwise, the program is ill-formed.

### Notes

The implementation may allocate the storage for the data structure needed for `Smart` (e.g. a control block) on construction, in order to leave non-throwing works to the destructor.

Arguments captured by value are destroyed after resetting.

### Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
LWG 3897 | C++23 | the destructor did not update a raw pointer to the null value | it does

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/memory/inout_ptr_t/%7Einout_ptr_t&oldid=162838"