On 2005-10-20, Matthias Troyer <troyer@itp.phys.ethz.ch> wrote: [...]
A general purpose system, that could be used to implement SI or totally alien unit systems --- even more alien than the US one :-) --- would be the best way to go. An SI unit system could then be easily built on top of it.
Well, SI wasn't a fundamental part of what I did - SI was an instantiation of a set of dimensions and units like so: struct SI : physical7_system<u::meter, ...> {}; You can define any system you like, and instantiate with any set of units you like. The point is, however, that SI (being derived from physical7_system<>) is only unit convertible to other instantiations of physical7_system. For example, it can convert to things from struct Imperial : physical7_system<u::foot, ...> {}; but not struct USDollar : currency_system<u::dollar> or struct UKPound : currency_system<u::sterling> (which USDollar and UKPound are inter-convertible) I'm obviously missing something. I can't see what more flexibility is needed :-( phil -- change name before "@" to "phil" for email