20 Memory management library [mem]

20.3 Smart pointers [smartptr]

20.3.1 Unique-ownership pointers [unique.ptr] unique_ptr for array objects with a runtime length [unique.ptr.runtime] Assignment [unique.ptr.runtime.asgn]

template<class U, class E> constexpr unique_ptr& operator=(unique_ptr<U, E>&& u) noexcept;
This operator behaves the same as in the primary template.
Constraints: Where UP is unique_ptr<U, E>:
  • U is an array type, and
  • pointer is the same type as element_type*, and
  • UP​::​pointer is the same type as UP​::​element_type*, and
  • UP​::​element_type(*)[] is convertible to element_type(*)[], and
  • is_assignable_v<D&, E&&> is true.
[Note 1: 
This replaces the Constraints: specification of the primary template.
— end note]