The basic_path constructor that takes two InputIterators: what kind of iterator is that? It doesn't seem to want characters, but an iterator of parts like produced by the begin/end functions. But the iterator's underlying type is not defined, so you can't make your own collection of "parts". So why doesn't the constructor just take its own iterator type, but is a template? What else could you give it? The documentation is not clear. --John TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. (Member NYSE, FINRA, SIPC and NFA), TradeStation Technologies, Inc., a trading software and subscription company, and TradeStation Europe Limited, a United Kingdom, FSA-authorized introducing brokerage firm. None of these companies provides trading or investment advice, recommendations or endorsements of any kind. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.