20 Memory management library [mem]

20.3 Smart pointers [smartptr]

constexpr pointer release() noexcept;

Postconditions: get() == nullptr.

Returns: The value get() had at the start of the call to release.

constexpr void reset(pointer p = pointer()) noexcept;

Effects: Assigns p to the stored pointer, and then, with the old value of the stored pointer, old_p, evaluates if (old_p) get_deleter()(old_p);

[Note 1:

The order of these operations is significant because the call to get_deleter() might destroy *this.

— end note]

Postconditions: get() == p.

[Note 2:

The postcondition does not hold if the call to get_deleter() destroys *this since this->get() is no longer a valid expression.

— end note]

Remarks: The behavior is undefined if the evaluation of get_deleter()(old_p) throws an exception.

constexpr void swap(unique_ptr& u) noexcept;

Preconditions: get_deleter() is swappable ([swappable.requirements]) and does not throw an exception under swap.

Effects: Invokes swap on the stored pointers and on the stored deleters of *this and u.