Re: [Boost-users] [Units] Temperature conversion problem

On Wed, 30 Nov 2011 15:00:28 -0800 Matthias Schabel wrote: ...snip...

This will have the added benefit of allowing conversions but disallowing operations that don't make sense... Some code:

#include <iostream>

#include #include #include #include

#include

using namespace boost::units;

int main() { quantitycelsius::temperature dTC(10.*celsius::temperature()); quantityfahrenheit::temperature dTF(10.*fahrenheit::temperature()); quantitysi::temperature dTK(10.*si::kelvin);

std::cout << dTC << std::endl; std::cout << dTF << std::endl; std::cout << dTK << std::endl;

quantitycelsius::temperature > TC(0*absolutecelsius::temperature()); quantityfahrenheit::temperature > TF(32.*absolutefahrenheit::temperature()); quantitysi::temperature > TK(0.*absolutesi::temperature());

std::cout << TC << std::endl; std::cout << TF << std::endl; std::cout << TK << std::endl;

std::cout << quantitycelsius::temperature >(TF) << std::endl; std::cout << quantitycelsius::temperature >(TK) << std::endl;

std::cout << quantityfahrenheit::temperature >(TC) << std::endl; std::cout << quantityfahrenheit::temperature >(TK) << std::endl;

// std::cout << TC+quantitycelsius::temperature >(TF) << std::endl; // fails because you cannot add two absolute temperatures std::cout << TC+quantitycelsius::temperature(dTF) << std::endl; std::cout << TF+quantityfahrenheit::temperature(dTC) << std::endl;

return 0; }

Not being a current user of boost units I was curious about above code and just thought I'd try it (it looked totally straightforward and I was thinking hmm maybe I should be using boost units at times) - However it didn't compile (msvc 2010 and boost 1.48) - It wasn't exactly hard to change it so it would compile - just played around a little and ended up adding :- #include #include However given your email had outputs pasted in so obviously code was running at some point I wondered : Was this just a cut & paste typo? Or do you need to be careful with headers in code using boost unit to make sure that it compiles x-platform or some such? Alex