Le 09/01/13 22:32, geocentrix a écrit :

I am attempting to replace my own Quantity class with boost::units.

One thing that is easy in my existing code is to convert a quantity from any unit of pressure into a specific unit, e.g. GPa (gigapascals), using a function ConvertedTo(). For example:

Pressure converted_value = existing_value.ConvertedTo(GPa);

How do you do this with boost:units.?

I have the following things defined:

typedef boost::units::quantityboost::units::si::pressure Pressure; static const Pressure Pa = 1.0 * boost::units::si::pascals; static const Pressure GPa = 1e9 * Pa; I guess the implicit conversion should do the trick if you type your variables

static const boost::units::quantityboost::units::si::pressure Pa = 1.0 * boost::units::si::pascals; static const boost::units::quantity GPa = Pa; as the following is part of the quantity interface template<typename YY> quantity(const quantity cid:part1.09060809.06050200@wanadoo.fr< unit cid:part2.07050401.07090106@wanadoo.fr< dimension_type, system_type >, YY > & source,

Pressure value(1.0^9 * Pa);

How do I display value in GPa? I am missing something very simple and wondered if someone could advise, please?

#include std::cout << GPa; HTH, Vicente