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Assignment.
value& operator=( object&& obj);
            The contents of the value are replaced with the contents of obj using move semantics:
          
*obj.storage() == *this->storage(), ownership of the underlying memory
                is transferred in constant time, with no possibility of exceptions.
                After assignment, the moved-from object becomes empty with its current
                storage pointer.
              *obj.storage() != *this->storage(), an element-wise copy is performed,
                which may throw. In this case, the moved-from object is not changed.
              
            Constant, or linear in the size of *this plus obj.size().
          
            Strong guarantee. Calls to memory_resource::allocate
            may throw.
          
| Name | Description | 
|---|---|
| 
                       | The object to move-assign from. |