bsl::set::operator=

Assign to this object the value and comparator of the specified rhs object, propagate to this object the allocator of rhs if the ALLOCATOR type has trait propagate_on_container_move_assignment, and return a reference providing modifiable access to this object. The contents of rhs are moved (in constant time) to this set if get_allocator() == rhs.get_allocator() (after accounting for the aforementioned trait); otherwise, all elements in this set are either destroyed or move‐assigned to and each additional element in rhs is move‐inserted into this set. rhs is left in a valid but unspecified state, and if an exception is thrown, *this is left in a valid but unspecified state. This method requires that the (template parameter) type KEY be move‐assignable and move‐insertable into this set (see {Requirements on KEY}).