From: Martin <adrianm@touchdown.se>
Your decimal64 is both an interface *and* an implementation. I just suggest to separate it. Let basic_decimal take care of the interface, while decimal64 takes care of the implementation.
I can agree that the interface could be formally specified as a basic_decimal but still don't understand the benefits of a decimal_traits vs a class that implements the basic_decimal interface.
basic_decimal can utilize fundamental operations from the traits class to provide the full interface. Put another way, the traits class needn't provide the entire interface that basic_decimal provides, so adapting a new type to fulfill the basic_decimal interface is easier. (That's theoretical, of course. I haven't any idea how much logic Daniel's basic_decimal implements beyond that provided by his traits class.) -- Rob Stewart stewart@sig.com Software Engineer http://www.sig.com Susquehanna International Group, LLP using std::disclaimer;