scaled units are a great feature of boost.units, however it seems complicated to (explicitly) create variables in such units. This is the way I found to create a variable that stores a quantity like GigaPascals: using boost::units; typedef make_scaled_unit<si::pressure, scale<10, static_rational< 9>
::type gpa_unit; gpa_unit GPa; quantity<gpa_unit> p(1.*GPa); //or p(1.*si::giga*si::pascal);
the question is, is there a simpler way of doing this? for example, just quantity<giga<si::pressure> > p = ...; //values are converted/stored in giga pascals. I could add some "metafunction": template<class Unit> giga{ typedef make_scaled_unit<Unit, scale<10, static_rational< 9> >
::type unit; };
and use it like quantity<giga<si::pressure>::unit> p; and even specialize for femto, atto, mega, kile, etc. I this already implemented in some other way? In this way if I had implemented an electronvolt unit I could have megaelectronvolt for free quantity<mega<electronvolt_unit>::unit> energy = ...; Thank you, Alfredo