systems.cpp

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                  << std::endl;

        std::cout << ml1 << " = " << quantity<fermi_length>(ml1) << std::endl
                  << ml2 << " = " << quantity<fermi_length>(ml2) << std::endl
                  << ml3 << " = " << quantity<fermi_length>(ml3) << std::endl
                  << ml4 << " = " << quantity<fermi_length>(ml4) << std::endl
                  << std::endl;

        std::cout << ml1 << " = " << quantity<angstrom_length>(ml1) << std::endl
                  << ml2 << " = " << quantity<angstrom_length>(ml2) << std::endl
                  << ml3 << " = " << quantity<angstrom_length>(ml3) << std::endl
                  << ml4 << " = " << quantity<angstrom_length>(ml4) << std::endl
                  << std::endl;

        std::cout << ml1 << " = " << quantity<micron_length>(ml1) << std::endl
                  << ml2 << " = " << quantity<micron_length>(ml2) << std::endl
                  << ml3 << " = " << quantity<micron_length>(ml3) << std::endl
                  << ml4 << " = " << quantity<micron_length>(ml4) << std::endl
                  << std::endl;

        std::cout << ml1 << " = " << quantity<nautical_mile_length>(ml1) << std::endl
                  << ml2 << " = " << quantity<nautical_mile_length>(ml2) << std::endl
                  << ml3 << " = " << quantity<nautical_mile_length>(ml3) << std::endl
                  << ml4 << " = " << quantity<nautical_mile_length>(ml4) << std::endl
                  << std::endl;

        quantity<ton_mass>    mm1(1.0*tons);
        
        std::cout << mm1 << " = " << quantity<cgs::mass>(mm1) << std::endl
                  //<< quantity<si::mass>(mm1) << std::endl    // this should work... 
                  << std::endl;
                  
        quantity<minute_time>    mt1(1.0*minutes);
        quantity<hour_time>        mt2(1.0*hours);
        quantity<day_time>        mt3(1.0*days);
        quantity<year_time>        mt4(1.0*years);
        
        std::cout << mt1 << " = " << quantity<si::time>(mt1) << std::endl
                  << mt2 << " = " << quantity<si::time>(mt2) << std::endl
                  << mt3 << " = " << quantity<si::time>(mt3) << std::endl
                  << mt4 << " = " << quantity<si::time>(mt4) << std::endl
                  << std::endl;

        std::cout << mt4 << "/" << mt1 << " = " << quantity<si::dimensionless>(mt4/mt1) << std::endl
                  << mt4 << "/" << mt2 << " = " << quantity<si::dimensionless>(mt4/mt2) << std::endl
                  << mt4 << "/" << mt3 << " = " << quantity<si::dimensionless>(mt4/mt3) << std::endl
                  << std::endl;

        std::cout << mt1 << " = " << quantity<minute_time>(mt1) << std::endl
                  << mt2 << " = " << quantity<minute_time>(mt2) << std::endl
                  << mt3 << " = " << quantity<minute_time>(mt3) << std::endl
                  << mt4 << " = " << quantity<minute_time>(mt4) << std::endl
                  << std::endl;

        std::cout << mt1 << " = " << quantity<hour_time>(mt1) << std::endl
                  << mt2 << " = " << quantity<hour_time>(mt2) << std::endl
                  << mt3 << " = " << quantity<hour_time>(mt3) << std::endl
                  << mt4 << " = " << quantity<hour_time>(mt4) << std::endl
                  << std::endl;

        std::cout << mt1 << " = " << quantity<day_time>(mt1) << std::endl
                  << mt2 << " = " << quantity<day_time>(mt2) << std::endl
                  << mt3 << " = " << quantity<day_time>(mt3) << std::endl
                  << mt4 << " = " << quantity<day_time>(mt4) << std::endl
                  << std::endl;

        std::cout << mt1 << " = " << quantity<year_time>(mt1) << std::endl
                  << mt2 << " = " << quantity<year_time>(mt2) << std::endl
                  << mt3 << " = " << quantity<year_time>(mt3) << std::endl
                  << mt4 << " = " << quantity<year_time>(mt4) << std::endl
                  << std::endl;
                          
        quantity<knot_velocity>    ms1(1.0*knots);
        
        std::cout << ms1 << " = " << quantity<si::velocity>(ms1) << std::endl
                  << std::endl;
                  
        quantity<barn_area>        ma1(1.0*barns);
        quantity<are_area>        ma2(1.0*ares);
        quantity<hectare_area>    ma3(1.0*hectares);
        
        std::cout << ma1 << " = " << quantity<si::area>(ma1) << std::endl
                  << ma2 << " = " << quantity<si::area>(ma2) << std::endl
                  << ma3 << " = " << quantity<si::area>(ma3) << std::endl
                  << std::endl;

        std::cout << ma3 << "/" << ma1 << " = " << quantity<si::dimensionless>(ma3/ma1) << std::endl
                  << ma3 << "/" << ma2 << " = " << quantity<si::dimensionless>(ma3/ma2) << std::endl
                  << std::endl;

        std::cout << ma1 << " = " << quantity<barn_area>(ma1) << std::endl
                  << ma2 << " = " << quantity<barn_area>(ma2) << std::endl
                  << ma3 << " = " << quantity<barn_area>(ma3) << std::endl
                  << std::endl;

        std::cout << ma1 << " = " << quantity<are_area>(ma1) << std::endl
                  << ma2 << " = " << quantity<are_area>(ma2) << std::endl
                  << ma3 << " = " << quantity<are_area>(ma3) << std::endl
                  << std::endl;

        std::cout << ma1 << " = " << quantity<hectare_area>(ma1) << std::endl
                  << ma2 << " = " << quantity<hectare_area>(ma2) << std::endl
                  << ma3 << " = " << quantity<hectare_area>(ma3) << std::endl
                  << std::endl;
        
        quantity<liter_volume>    mv1(1.0*liters);
        
        std::cout << mv1 << " = " << quantity<si::volume>(mv1) << std::endl
                  << std::endl;
        
        quantity<mmHg_pressure>            mp1(1.0*mmHgs);
        quantity<torr_pressure>            mp2(1.0*torrs);
        quantity<bar_pressure>            mp3(1.0*bars);
        quantity<atmosphere_pressure>    mp4(1.0*atmospheres);
        
        std::cout << mp1 << " = " << quantity<si::pressure>(mp1) << std::endl
                  << mp2 << " = " << quantity<si::pressure>(mp2) << std::endl
                  << mp3 << " = " << quantity<si::pressure>(mp3) << std::endl
                  << mp4 << " = " << quantity<si::pressure>(mp4) << std::endl
                  << std::endl;

        std::cout << mp4 << "/" << mp1 << " = " << quantity<si::dimensionless>(mp4/mp1) << std::endl
                  << mp4 << "/" << mp2  << " = " << quantity<si::dimensionless>(mp4/mp2) << std::endl
                  << mp4 << "/" << mp3  << " = " << quantity<si::dimensionless>(mp4/mp3) << std::endl
                  << std::endl;

        std::cout << mp1 << " = " << quantity<mmHg_pressure>(mp1) << std::endl
                  << mp2 << " = " << quantity<mmHg_pressure>(mp2) << std::endl
                  << mp3 << " = " << quantity<mmHg_pressure>(mp3) << std::endl
                  << mp4 << " = " << quantity<mmHg_pressure>(mp4) << std::endl
                  << std::endl;

        std::cout << mp1 << " = " << quantity<torr_pressure>(mp1) << std::endl
                  << mp2 << " = " << quantity<torr_pressure>(mp2) << std::endl
                  << mp3 << " = " << quantity<torr_pressure>(mp3) << std::endl
                  << mp4 << " = " << quantity<torr_pressure>(mp4) << std::endl
                  << std::endl;

        std::cout << mp1 << " = " << quantity<bar_pressure>(mp1) << std::endl
                  << mp2 << " = " << quantity<bar_pressure>(mp2) << std::endl
                  << mp3 << " = " << quantity<bar_pressure>(mp3) << std::endl
                  << mp4 << " = " << quantity<bar_pressure>(mp4) << std::endl
                  << std::endl;

        std::cout << mp1 << " = " << quantity<atmosphere_pressure>(mp1) << std::endl
                  << mp2 << " = " << quantity<atmosphere_pressure>(mp2) << std::endl
                  << mp3 << " = " << quantity<atmosphere_pressure>(mp3) << std::endl
                  << mp4 << " = " << quantity<atmosphere_pressure>(mp4) << std::endl
                  << std::endl;
    }
    
    {
        using namespace boost::units::us;
        
        std::cout << "Testing U.S. customary base units..." << std::endl;
        
        quantity<mil_length>            iml1(1.0*mils);
        quantity<inch_length>            iml2(1.0*inchs);
        quantity<foot_length>            iml3(1.0*foots);
        quantity<yard_length>            iml4(1.0*yards);
        quantity<mile_length>            iml5(1.0*miles);
        
        std::cout << iml1 << " = " << quantity<si::length>(iml1) << std::endl
                  << iml2 << " = " << quantity<si::length>(iml2) << std::endl
                  << iml3 << " = " << quantity<si::length>(iml3) << std::endl
                  << iml4 << " = " << quantity<si::length>(iml4) << std::endl
                  << iml5 << " = " << quantity<si::length>(iml5) << std::endl
                  << std::endl;

        std::cout << iml5 << "/" << iml1 << " = " << quantity<si::dimensionless>(iml5/iml1) << std::endl
                  << iml5 << "/" << iml2 << " = " << quantity<si::dimensionless>(iml5/iml2) << std::endl
                  << iml5 << "/" << iml3 << " = " << quantity<si::dimensionless>(iml5/iml3) << std::endl
                  << iml5 << "/" << iml4 << " = " << quantity<si::dimensionless>(iml5/iml4) << std::endl
                  << std::endl;

        std::cout << iml1 << " = " << quantity<mil_length>(iml1) << std::endl
                  << iml2 << " = " << quantity<mil_length>(iml2) << std::endl
                  << iml3 << " = " << quantity<mil_length>(iml3) << std::endl
                  << iml4 << " = " << quantity<mil_length>(iml4) << std::endl
                  << iml5 << " = " << quantity<mil_length>(iml5) << std::endl
                  << std::endl;

        std::cout << iml1 << " = " << quantity<inch_length>(iml1) << std::endl
                  << iml2 << " = " << quantity<inch_length>(iml2) << std::endl
                  << iml3 << " = " << quantity<inch_length>(iml3) << std::endl
                  << iml4 << " = " << quantity<inch_length>(iml4) << std::endl
                  << iml5 << " = " << quantity<inch_length>(iml5) << std::endl
                  << std::endl;

        std::cout << iml1 << " = " << quantity<foot_length>(iml1) << std::endl
                  << iml2 << " = " << quantity<foot_length>(iml2) << std::endl
                  << iml3 << " = " << quantity<foot_length>(iml3) << std::endl
                  << iml4 << " = " << quantity<foot_length>(iml4) << std::endl
                  << iml5 << " = " << quantity<foot_length>(iml5) << std::endl
                  << std::endl;

        std::cout << iml1 << " = " << quantity<yard_length>(iml1) << std::endl
                  << iml2 << " = " << quantity<yard_length>(iml2) << std::endl
                  << iml3 << " = " << quantity<yard_length>(iml3) << std::endl
                  << iml4 << " = " << quantity<yard_length>(iml4) << std::endl
                  << iml5 << " = " << quantity<yard_length>(iml5) << std::endl
                  << std::endl;

        std::cout << iml1 << " = " << quantity<mile_length>(iml1) << std::endl
                  << iml2 << " = " << quantity<mile_length>(iml2) << std::endl
                  << iml3 << " = " << quantity<mile_length>(iml3) << std::endl
                  << iml4 << " = " << quantity<mile_length>(iml4) << std::endl
                  << iml5 << " = " << quantity<mile_length>(iml5) << std::endl
                  << std::endl;

        quantity<grain_mass>            imm1(1.0*grains);
        quantity<dram_mass>                imm2(1.0*drams);
        quantity<ounce_mass>            imm3(1.0*ounces);
        quantity<pound_mass>            imm4(1.0*pounds);
        quantity<hundredweight_mass>    imm5(1.0*hundredweights);
        quantity<ton_mass>                imm6(1.0*tons);

        std::cout << imm1 << " = " << quantity<si::mass>(imm1) << std::endl
                  << imm2 << " = " << quantity<si::mass>(imm2) << std::endl
                  << imm3 << " = " << quantity<si::mass>(imm3) << std::endl
                  << imm4 << " = " << quantity<si::mass>(imm4) << std::endl