[Boost-bugs] [Boost C++ Libraries] #6957: Boost.units: static pow<>() fails for quantities with non-double type

Subject: [Boost-bugs] [Boost C++ Libraries] #6957: Boost.units: static pow<>() fails for quantities with non-double type
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-05-31 19:07:45

#6957: Boost.units: static pow<>() fails for quantities with non-double type
--------------------------------------------------+-------------------------
 Reporter:  Anna Jaruga <ajaruga@…>               |       Owner:  matthiasschabel
     Type:  Bugs                                  |      Status:  new            
Milestone:  To Be Determined                      |   Component:  units          
  Version:  Boost 1.48.0                          |    Severity:  Problem        
 Keywords:  units pow                             |  
--------------------------------------------------+-------------------------
 Below is a short example depicting that pow<>() works only in the quantity
 in the argument has double precision representation. Hope that helps.



 ajaruga_at_granda:~/icicle$ cat test.cpp
 #include <boost/units/pow.hpp>
 #include <boost/units/systems/si.hpp>
 using namespace boost::units;

 int main() {
   quantity<si::length, real_t> a = 1 * si::metres;
   quantity<si::volume, real_t> b = pow<3>(a);
 }
 ajaruga_at_granda:~/icicle$ g++ -Dreal_t=double test.cpp && echo OK
 OK
 ajaruga_at_granda:~/icicle$ g++ -Dreal_t=float test.cpp && echo OK
 test.cpp: In function ‘int main()’:
 test.cpp:7:44: error: conversion from
 ‘boost::units::power_typeof_helper<boost::units::quantity<boost::units::unit<boost::units::list<boost::units::dim<boost::units::length_base_dimension,
 boost::units::static_rational<1l> >, boost::units::dimensionless_type>,
 boost::units::homogeneous_system<boost::units::list<boost::units::si::meter_base_unit,
 boost::units::list<boost::units::scaled_base_unit<boost::units::cgs::gram_base_unit,
 boost::units::scale<10l, boost::units::static_rational<3l> > >,
 boost::units::list<boost::units::si::second_base_unit,
 boost::units::list<boost::units::si::ampere_base_unit,
 boost::units::list<boost::units::si::kelvin_base_unit,
 boost::units::list<boost::units::si::mole_base_unit,
 boost::units::list<boost::units::si::candela_base_unit,
 boost::units::list<boost::units::angle::radian_base_unit,
 boost::units::list<boost::units::angle::steradian_base_unit,
 boost::units::dimensionless_type> > > > > > > > > > >, float>,
 boost::units::static_rational<3l> >::type {aka
 boost::units::quantity<boost::units::unit<boost::units::list<boost::units::dim<boost::units::length_base_dimension,
 boost::units::static_rational<3l> >, boost::units::dimensionless_type>,
 boost::units::homogeneous_system<boost::units::list<boost::units::si::meter_base_unit,
 boost::units::list<boost::units::scaled_base_unit<boost::units::cgs::gram_base_unit,
 boost::units::scale<10l, boost::units::static_rational<3l> > >,
 boost::units::list<boost::units::si::second_base_unit,
 boost::units::list<boost::units::si::ampere_base_unit,
 boost::units::list<boost::units::si::kelvin_base_unit,
 boost::units::list<boost::units::si::mole_base_unit,
 boost::units::list<boost::units::si::candela_base_unit,
 boost::units::list<boost::units::angle::radian_base_unit,
 boost::units::list<boost::units::angle::steradian_base_unit,
 boost::units::dimensionless_type> > > > > > > > > > >, double>}’ to non-
 scalar type
 ‘boost::units::quantity<boost::units::unit<boost::units::list<boost::units::dim<boost::units::length_base_dimension,
 boost::units::static_rational<3l> >, boost::units::dimensionless_type>,
 boost::units::homogeneous_system<boost::units::list<boost::units::si::meter_base_unit,
 boost::units::list<boost::units::scaled_base_unit<boost::units::cgs::gram_base_unit,
 boost::units::scale<10l, boost::units::static_rational<3l> > >,
 boost::units::list<boost::units::si::second_base_unit,
 boost::units::list<boost::units::si::ampere_base_unit,
 boost::units::list<boost::units::si::kelvin_base_unit,
 boost::units::list<boost::units::si::mole_base_unit,
 boost::units::list<boost::units::si::candela_base_unit,
 boost::units::list<boost::units::angle::radian_base_unit,
 boost::units::list<boost::units::angle::steradian_base_unit,
 boost::units::dimensionless_type> > > > > > > > > > >, float>’ requested

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/6957>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.