function as arguments to functions(constructors)

I was wondering if you could tell me if it is possible to pass a global function as an argument to a class constructor, and if so, how? I have made a building block/class that is a 'SafeTypedSTR'. (SafeAndTypedString(tm)). I want to supply the typing function upon instantiation. In essence, it has the following "public" functions: PutSafe(), GetSafe(), Validate(). And it has the following "private" function identifier, which I wish to assign the external, public typing function to: TypingFunc(). {I would use a funcptr in C++/Java} Some examples of it's use would be: URL-strings.( instantiate with URLConforms($str) ) DB-strings.( instantiate with StrDBSafe($str) ) PGP-strings.( instantiate with PGPConforms($str) ) EMAIL-strings.( instantiate with EMAILConforms($str) ) PhyADDR-strings ( instantiate with PHYADDRConforms($str) ) FILENAME-strings ( instantiate with FILENAMEConforms($str) ) PHONUM-strings( instantiate with PHONUMConforms($str) ) I also want the 'typing function' to be in the public namespace in order to be able to use it in other places. -- ----------------------------------------------------------------- Time Spent With Your Dog(Kid) is Time Well Spent ----------------------------------------------------------------- Sincerely, Dennis Gearon