id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
6119	output streams not working with units	Noel Belcourt	Matthias Schabel	"Compiling the temperature.cpp example problems fails with this error message 

S896822:example kbelco$ icpc -g -I ../../.. temperature.cpp 
../../../boost/units/io.hpp(967): error: more than one instance of overloaded function ""boost::units::detail::do_print_prefixed"" matches the argument list:
            function template ""void boost::units::detail::do_print_prefixed<Prefixes,CharT,Traits,Dimension,L,Scale,T>(std::basic_ostream<_CharT, _Traits> &, const boost::units::quantity<boost::units::unit<Dimension, boost::units::heterogeneous_system<boost::units::heterogeneous_system_impl<L, Dimension, Scale>>, void>, T> &)""
            function template ""void boost::units::detail::do_print_prefixed<Prefixes,CharT,Traits,Dimension,System,T>(std::basic_ostream<_CharT, _Traits> &, const boost::units::quantity<boost::units::unit<Dimension, System, void>, T> &)""
            function template ""void boost::units::detail::do_print_prefixed<Prefixes,CharT,Traits,Unit,T>(std::basic_ostream<_CharT, _Traits> &, const boost::units::quantity<Unit, T> &)""
            argument types are: (std::basic_ostream<char, std::char_traits<char>>, const boost::units::quantity<boost::units::fahrenheit::temperature, double>)
      detail::do_print_prefixed<Prefixes>(os, q);
      ^
          detected during:
            instantiation of ""void boost::units::detail::maybe_print_prefixed<Prefixes,CharT,Traits,Unit,T>(std::basic_ostream<_CharT, _Traits> &, const boost::units::quantity<Unit, T> &, boost::mpl::true_) [with Prefixes=boost::units::detail::engineering_prefixes, CharT=char, Traits=std::char_traits<char>, Unit=boost::units::fahrenheit::temperature, T=double]"" at line 1050
            instantiation of ""std::basic_ostream<_CharT, _Traits> &boost::units::operator<<(std::basic_ostream<_CharT, _Traits> &, const boost::units::quantity<Unit2, T2> &) [with Char=char, Traits=std::char_traits<char>, Unit=boost::units::fahrenheit::temperature, T=double]"" at line 92 of ""temperature.cpp""

The same message occurs with a small reproducer.

#include <iostream>
#include <boost/units/io.hpp>
#include <boost/units/quantity.hpp>
#include <boost/units/systems/temperature/fahrenheit.hpp>

int main(int, char **) {
  using namespace boost::units;
  quantity<fahrenheit::temperature> t;
  cout << t << endl;
  return 0;
}
"	Bugs	closed	To Be Determined	units	Boost Development Trunk	Problem	wontfix