Hi Stephen, I don't have much experience with creating new units and new systems in Boost Units, but I find that the predefined units and systems and prefixes already have most needs covered. For example, see: http://www.boost.org/doc/libs/1_48_0/doc/html/boost_units/Examples.html#boos... for the use of "kilo*meters". Of course you can typedef your own kilometer, if you absolutely must, as in: http://www.boost.org/doc/libs/1_48_0/doc/html/boost_units/Units.html#boost_u... Furthermore, you can static_cast between quantities (as long as the conversion is defined somewhere [it already is for degrees and radians]). See: http://www.boost.org/doc/libs/1_48_0/doc/html/boost_units/Quantities.html#bo... Lastly, creating a dimensionless angle type is possible but I would advise against it, as it then puts you in the territory of not being able to distinguish between solid angular quantities and pseudovectors, and breaks your interoperability with all the provided angular units. See the first 2 points in this FAQ for some rationale behind angles: http://www.boost.org/doc/libs/1_48_0/doc/html/boost_units/FAQ.html#boost_uni... The situation does sometimes lead to code that doesn't look as elegant as the maths did on paper, but it does maintain correctness which leads to less uncertainty about its operation. Best of luck with using Boost.Units, I hope the above links help a little. Regards, Edmund Fokschaner On 9 December 2011 16:30, Stephen Torri wrote:

Below is a dump of the build output from compiling the stand alone example. In order to understand what I am doing I am trying to setup a boost unit system where length is in kilometers, angle is in degrees and time is in minutes. I would like to have the ability to enter automatically convert angles from degrees to radians. In addition I am attemping to make the angle types I use to be dimensionless.

Regards, Stephen

----------- 1>Compiling... 1>boost_units.cpp 1>C:\boost\boost/units/detail/linear_algebra.hpp(342) : error C3083: 'item': the symbol to the left of a '::' must be a type 1> C:\boost\boost/units/detail/linear_algebra.hpp(310) : see reference to class template instantiation

'boost::units::detail::invert_handle_inital_rows<0>::apply' being compiled 1> with 1> [ 1> RowsBegin=boost::units::list::apply,boost::units::static_rational<1>>::type,boost::units::detail::invert_handle_after_pivot_row<0>::apply,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>>::new_matrix>, 1> IdentityBegin=boost::units::list,boost::units::list>,boost::units::dimensionless_type>>::type,boost::units::list,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>,boost::units::detail::invert_handle_after_pivot_row<0>::applyboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>,boost::units::list,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>>::identity_result> 1> ] 1> C:\boost\boost/units/detail/linear_algebra.hpp(310) : see reference to class template instantiation

'boost::units::detail::invert_handle_inital_rows<N>::apply' being compiled 1> with 1> [ 1> N=1, 1> RowsBegin=boost::units::list::apply,boost::units::static_rational<1>>::type,boost::units::detail::invert_handle_after_pivot_row<0>::apply,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>>::new_matrix>>, 1> IdentityBegin=boost::units::list,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>,boost::units::list,boost::units::list>,boost::units::dimensionless_type>>::type,boost::units::list,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>,boost::units::detail::invert_handle_after_pivot_row<0>::applyboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>,boost::units::list,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>>::identity_result>> 1> ] 1> C:\boost\boost/units/detail/linear_algebra.hpp(501) : see reference to class template instantiation

'boost::units::detail::invert_handle_inital_rows<N>::apply' being compiled 1> with 1> [ 1> N=2, 1> RowsBegin=boost::units::list::apply,boost::units::static_rational<1>>::type,boost::units::list::apply,boost::units::static_rational<1>>::type,boost::units::detail::invert_handle_after_pivot_row<0>::apply,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>>::new_matrix>>>, 1> IdentityBegin=boost::units::list,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>,boost::units::list,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>,boost::units::list,boost::units::list>,boost::units::dimensionless_type>>::type,boost::units::list,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>,boost::units::detail::invert_handle_after_pivot_row<0>::applyboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>,boost::units::list,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>>::identity_result>>> 1> ] 1> C:\boost\boost/units/detail/linear_algebra.hpp(503) : see reference to class template instantiation 'boost::units::detail::invert_impl<N>::apply' being compiled 1> with 1> [ 1> N=1, 1> RowsBegin=boost::units::list::apply,boost::units::static_rational<1>>::type,boost::units::list::apply,boost::units::static_rational<1>>::type,boost::units::detail::invert_handle_after_pivot_row<0>::apply,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>>::new_matrix>>>, 1> IdentityBegin=boost::units::list,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>,boost::units::list,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>,boost::units::list,boost::units::list>,boost::units::dimensionless_type>>::type,boost::units::list,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>,boost::units::detail::invert_handle_after_pivot_row<0>::applyboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>,boost::units::list,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>>::identity_result>>> 1> ] 1> C:\boost\boost/units/detail/linear_algebra.hpp(503) : see reference to class template instantiation 'boost::units::detail::invert_impl<N>::apply' being compiled 1> with 1> [ 1> N=2, 1> RowsBegin=boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>,boost::units::list,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>,boost::units::detail::determine_extra_equations_impl<0>::apply,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>::type>>>, 1> IdentityBegin=boost::units::list,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>,boost::units::list,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>,boost::units::list,boost::units::list>,boost::units::dimensionless_type>>::type,boost::units::list,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>,boost::units::detail::invert_handle_after_pivot_row<0>::applyboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>,boost::units::list,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>>::identity_result>>> 1> ] 1> C:\boost\boost/units/detail/linear_algebra.hpp(542) : see reference to class template instantiation 'boost::units::detail::invert_impl<N>::apply' being compiled 1> with 1> [ 1> N=3, 1> RowsBegin=boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>,boost::units::list>,boost::units::dimensionless_type>>::type,boost::units::list,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>,boost::units::dimensionless_type>>>, 1> IdentityBegin=boost::units::list,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>,boost::units::list,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>,boost::units::list,boost::units::list>,boost::units::dimensionless_type>>::type,boost::units::list,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>>,boost::units::detail::make_identity<0>::apply<3>::type>>> 1> ] 1> C:\boost\boost/units/detail/linear_algebra.hpp(828) : see reference to class template instantiation 'boost::units::detail::make_square_and_invert<Matrix>' being compiled 1> with 1> [ 1> Matrix=boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>,boost::units::list>,boost::units::dimensionless_type>>::type,boost::units::list,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>,boost::units::list,boost::units::listboost::units::dimensionless_type::type,boost::units::detail::expand_dimensions<0>::applyboost::units::dimensionless_type,boost::units::dimensionless_type::type>>,boost::units::dimensionless_type>>> 1> ] 1> C:\boost\boost/units/detail/linear_algebra.hpp(1032) : see reference to class template instantiation 'boost::units::detail::normalize_units<T>' being compiled 1> with 1> [ 1> T=boost::units::listmyproject::units::earth::kilometer_base_unit,boost::units::dimensionless_typ...>> 1> ] 1> C:\boost\boost/units/detail/linear_algebra.hpp(1051) : see reference to class template instantiation

'boost::units::detail::calculate_base_unit_exponents_impl<false>::apply' being compiled 1> with 1> [ 1> T=boost::units::listmyproject::units::earth::kilometer_base_unit,boost::units::dimensionless_typ...>>, 1> Dimensions=boost::units::length_dimension 1> ] 1> C:\boost\boost/units/heterogeneous_system.hpp(243) : see reference to class template instantiation 'boost::units::detail::calculate_base_unit_exponents' being compiled 1> with 1> [ 1> T=boost::units::listmyproject::units::earth::kilometer_base_unit,boost::units::dimensionless_typ...>>, 1> Dimensions=boost::units::length_dimension 1> ] 1> C:\boost\boost/units/unit.hpp(92) : see reference to class template instantiation 'boost::units::detail::make_heterogeneous_system' being compiled 1> with 1> [ 1> Dimensions=boost::units::length_dimension, 1> System=myproject::units::earth::system 1> ] 1> C:\boost\boost/units/unit.hpp(99) : see reference to class template instantiation 'boost::units::reduce_unit<Unit>' being compiled 1> with 1> [ 1> Unit=boost::units::unitboost::units::length_dimension,myproject::units::earth::system 1> ] 1> ..\..\..\apps\boost_units\boost_units.cpp(81) : see reference to class template instantiation 'boost::units::is_implicitly_convertible' being compiled 1> with 1> [ 1> S1=boost::units::unitboost::units::length_dimension,myproject::units::earth::system, 1> S2=boost::units::unitboost::units::length_dimension,myproject::units::earth::system 1> ] 1>C:\boost\boost/units/detail/linear_algebra.hpp(342) : error C2039: 'Numerator' : is not a member of 'boost::units::dimensionless_type' 1> C:\boost\boost/units/dimensionless_type.hpp(37) : see declaration of 'boost::units::dimensionless_type' 1>C:\boost\boost/units/detail/linear_algebra.hpp(342) : error C2065: 'Numerator' : undeclared identifier

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