Re: [Boost-users] [units] Creating specific unit quantities

Subject: Re: [Boost-users] [units] Creating specific unit quantities
From: Matthias Schabel (boost_at_[hidden])
Date: 2011-03-16 18:13:16

> void setY(quantity<unit<???, System> > const& y) {
>   m_Y = quantity<si::dimensionless>(y);
> }
>  
> I would like to be able to accept any systems dimensionless quantity.  Since dimensionless isn't a physical system I obviously didn't find a tag I could use like length_dimension.  What should I do here?

I'm getting the feeling that you're not trying very hard here... Look in the <boost/units> directory and you will find three headers : dimensionless_type.hpp, dimensionless_unit.hpp, and dimensionless_quantity.hpp, giving you a variety of options :

template<class System,class Y> void setA(quantity<unit<dimensionless_type,System>,Y>&) { }
template<class System,class Y> void setB(quantity<typename dimensionless_unit<System>::type,Y>&) { }
template<class System,class Y> void setC(typename dimensionless_quantity<System,Y>::type&) { }

Matthias