20 Memory management library [mem]

20.3 Smart pointers [smartptr]

20.3.1 Unique-ownership pointers [unique.ptr] unique_ptr for single objects [unique.ptr.single] Modifiers [unique.ptr.single.modifiers]

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.