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Now, it is also possible to define a base unit as being a multiple of another
base unit. For example, the way that kilogram_base_unit
is actually defined by the library is along the following lines
struct gram_base_unit : boost::units::base_unit<gram_base_unit, mass_dimension, 1> {}; typedef scaled_base_unit<gram_base_unit, scale<10, static_rational<3> > > kilogram_base_unit;
This basically defines a kilogram as being 10^3 times a gram.
There are several advantages to this approach.