Order of composite units in the output

Hi, I think I am beginning to get the boost:units library, but I still have one problem. Consider: #include <iostream> #include <boost/units/io.hpp> #include <boost/units/systems/si/length.hpp> #include <boost/units/make_system.hpp> #include <boost/units/quantity.hpp> #include <boost/units/base_dimension.hpp> #include <boost/units/base_unit.hpp> #include <boost/units/derived_dimension.hpp> // Introduce slot (measured in e.g. ffe or tfe) as a basic dimension, unit and in a system struct slot_base_dimension : boost::units::base_dimension<slot_base_dimension, 1> { }; typedef slot_base_dimension::dimension_type slot_dimension; struct ffe_base_unit : public boost::units::base_unit<ffe_base_unit, slot_dimension, 1> { static std::string name() { return("40ft equivalent"); } static std::string symbol() { return("ffe"); } }; typedef ffe_base_unit::unit_type slot_t; BOOST_UNITS_STATIC_CONSTANT(ffe, slot_t); /// derived dimension (slot) flow typedef boost::units::derived_dimension<slot_base_dimension,1,boost::units::time_base_dimension,-1>::type flow_dimension; /// placeholder class defining si unit system typedef boost::units::make_system<boost::units::si::meter_base_unit, boost::units::si::second_base_unit, ffe_base_unit>::type unit_system; typedef boost::units::unit<flow_dimension,unit_system> flow_t; BOOST_UNITS_STATIC_CONSTANT(ffe_per_second, flow_t); int main() { boost::units::quantity<flow_t> flow(4*ffe_per_second); std::cout << "flow= " << flow << std::endl; } This program outputs flow= 4 s^-1 ffe which is correct, but a bit unusual... 4 ffe/s or even 4 ffe s^-1 would have been better. Is this possible? Thanks! -- kind regards, Esben

You can, of course, create a custom output for any particular unit if you desire. The default output formatting simply traverses the list of base units in the (arbitrary) order that they appear... Matthias
AMDG
Esben Mose Hansen wrote:
This program outputs flow= 4 s^-1 ffe
which is correct, but a bit unusual... 4 ffe/s or even 4 ffe s^-1 would have been better. Is this possible?
Not really. The output formatting is fairly primitive.
In Christ, Steven Watanabe
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participants (3)
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Esben Mose Hansen
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Matthias Schabel
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Steven Watanabe