From: Steven Watanabe (steven_at_[hidden])
Date: 2007-03-31 18:04:37
AMDG
Matthias Schabel <boost <at> schabel-family.org> writes:
> >
> > You're misusing dimensionless_quantity....
>
> Not sure what you mean - I need to preserve system information in
> dimensionless quantities to make the trig functions properly
> invertible : that is acos(cos(theta)) == theta should hold true...
/// cos of theta in radians
template<class Y>
typename dimensionless_quantity<*angle::radian*,Y>::type
cos(const quantity<angle::radian,Y>& theta)
{
return std::cos(theta.value());
}
/// utility class to simplify construction of dimensionless quantities
template<*class System*,class Y>
struct dimensionless_quantity
{
typedef quantity<typename dimensionless_unit<System>::type,Y> type;
};
In Christ,
Steven Watanabe