boost::iterator_adaptor

Hi,

I am trying to write my own iterator - class and using for that the
boost::iterator_adaptor. I could find on the webpage several examples of how
to connect an existing iterator like std::string::iterator or a simple array
as "base-class" for my new iterator, but what can I do if I dont have any
base-iterator? In the documentation I found the following sentence:
"The Iterator Adaptor library allows you transform an arbitrary ``base''
type into a standard-conforming iterator with the behaviors you choose.
Doing so is especially easy if the ``base'' type is itself an iterator."
In my situation I dont have any base type which is an iterator, so how
should I now create such a base-type? Which are the specifications of such a
base-type? Where can I get information on how to create a new base-type?

I am trying to write an iterator which reads records from a file or a
database and always when I do the it++ the next record is read from the file
or database.

Thanks a lot in advance
Julia







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