[container.node.cons]

Effects: Constructs a node-handle object initializing ptr_ with nh.ptr_.

Move constructs alloc_ with nh.alloc_.

Assigns nullptr to nh.ptr_ and assigns nullopt to nh.alloc_.

constexpr node-handle& operator=(node-handle&& nh);

Preconditions: Either !alloc_ is true, or ator-traits::propagate_on_container_move_assignment::value is true, or alloc_ == nh.alloc_ is true.

Effects:

(3.1)
If ptr_ != nullptr is true, destroys the value_type subobject in the container-node-type object pointed to by ptr_ by calling ator-traits::destroy, then deallocates ptr_ by calling ator-traits::template rebind_traits<container-node-type>::deallocate.
(3.2)
Assigns nh.ptr_ to ptr_.
(3.3)
If !alloc_ is true or ator-traits::propagate_on_container_move_assignment::value is true, move assigns nh.alloc_ to alloc_.
(3.4)
Assigns nullptr to nh.ptr_ and assigns nullopt to nh.alloc_.

Throws: Nothing.

23 Containers library [containers]