ElementRef(iterator_type *pitr=NULL)
Constructor.
If the pitr parameter is NULL or the default value is used, the object created is a simple wrapper and not connected to a container. If a valid iterator parameter is passed in, the wrapped element will be associated with the matching key/data pair in the underlying container.
ElementRef(const ddt &dt)
Constructor.
Initializes an ElementRef wrapper without an iterator. It can only be used to wrap a data element in memory, it can't access an unerlying database.
ElementRef(const self &other)
Copy constructor.
The constructor takes a "deep" copy. The created object will be identical to, but independent from the original object.