NAME¶

std::inout_ptr_t::~inout_ptr_t - std::inout_ptr_t::~inout_ptr_t

Synopsis¶

~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 it does
the null value