Hi,<br>I used a previous version of the Units library to sketch out a fps system (foot-pound-second) that paralleled the cgs system, and the code compiled and ran fine. I am now returning to this effort, and I want to wrap it into a coordinate transform package, but I can no longer get the code to compile. I am using the latest code from the Boost sandbox, and MS Visual Studio with WinXP. The problem appears to be in the conversions, but I don&#39;t see what is missing when compared to cgs.<br>
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; typedef unit&lt;length_dimension, SI::system &gt; my_unit;<br>&nbsp;&nbsp;&nbsp; &nbsp; typedef quantity&lt; my_unit, ofs::Real64 &gt;&nbsp; linear_measure;<br>&nbsp;&nbsp;&nbsp; &nbsp; linear_measure dummy(200.0*CGS::centimeter);&nbsp;&nbsp; // implicit conversion from SI::meter to CGS::centimeter<br>
&nbsp;&nbsp;&nbsp; &nbsp; linear_measure dummy2(200.0*FPS::foot);<br><br>The first three lines work fine, but the last one generates 10 errors with my compiler (MSVC 8.0). The first error is<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; boost/units/detail/conversion_impl.hpp(342) : error C2039: &#39;type&#39; : is not a member of &#39;boost::units::detail::call_base_unit_converter&lt;Source,Dest&gt;&#39;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; with<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Source=boost::units::foot_base_unit,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Dest=boost::units::unit&lt;boost::units::length_dimension,boost::units::heterogeneous_system&lt;boost::units::heterogeneous_system_pair&lt;boost::units::dimension_list&lt;boost::units::heterogeneous_system_dim&lt;boost::units::meter_base_unit,boost::units::static_rational&lt;1&gt;&gt;,boost::units::dimensionless_type&gt;,boost::units::length_dimension&gt;&gt;&gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ]<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; boost/units/detail/conversion_impl.hpp(536) : see reference to class template instantiation &#39;boost::units::detail::conversion_impl&lt;N&gt;::apply&lt;Begin,DestinationSystem&gt;&#39; being compiled<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; with<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; N=1,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Begin=boost::units::dimension_list&lt;boost::units::heterogeneous_system_dim&lt;boost::units::foot_base_unit,boost::units::static_rational&lt;1&gt;&gt;,boost::units::dimensionless_type&gt;,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DestinationSystem=boost::units::homogeneous_system&lt;boost::units::dimension_list&lt;boost::units::meter_base_unit,boost::units::dimensionless_type&gt;&gt;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ]<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; boost/units/detail/conversion_impl.hpp(216) : see reference to class template instantiation &#39;boost::units::detail::conversion_factor_helper&lt;Source,Dest&gt;&#39; being compiled<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; with<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Source=boost::units::unit&lt;boost::units::length_dimension,boost::units::heterogeneous_system&lt;boost::units::heterogeneous_system_pair&lt;boost::units::dimension_list&lt;boost::units::heterogeneous_system_dim&lt;boost::units::foot_base_unit,boost::units::static_rational&lt;1&gt;&gt;,boost::units::dimensionless_type&gt;,boost::units::length_dimension&gt;&gt;&gt;,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Dest=boost::units::unit&lt;boost::units::length_dimension,boost::units::heterogeneous_system&lt;boost::units::heterogeneous_system_pair&lt;boost::units::dimension_list&lt;boost::units::heterogeneous_system_dim&lt;boost::units::meter_base_unit,boost::units::static_rational&lt;1&gt;&gt;,boost::units::dimensionless_type&gt;,boost::units::length_dimension&gt;&gt;&gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ]<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; boost/units/detail/conversion_impl.hpp(324) : see reference to class template instantiation &#39;boost::units::detail::call_base_unit_converter_base_unit_impl&lt;false,false&gt;::apply&lt;Source,Dest&gt;&#39; being compiled<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; with<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Source=boost::units::foot_base_unit,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Dest=boost::units::meter_base_unit<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ]<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; boost/units/detail/conversion_impl.hpp(342) : see reference to class template instantiation &#39;boost::units::detail::call_base_unit_converter&lt;Source,Dest&gt;&#39; being compiled<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; with<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Source=boost::units::foot_base_unit,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Dest=boost::units::unit&lt;boost::units::length_dimension,boost::units::heterogeneous_system&lt;boost::units::heterogeneous_system_pair&lt;boost::units::dimension_list&lt;boost::units::heterogeneous_system_dim&lt;boost::units::meter_base_unit,boost::units::static_rational&lt;1&gt;&gt;,boost::units::dimensionless_type&gt;,boost::units::length_dimension&gt;&gt;&gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ]<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; boost/units/detail/conversion_impl.hpp(377) : see reference to class template instantiation &#39;boost::units::detail::conversion_impl&lt;N&gt;::apply&lt;Begin,DestinationSystem&gt;&#39; being compiled<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; with<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; N=1,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Begin=boost::units::dimension_list&lt;boost::units::heterogeneous_system_dim&lt;boost::units::foot_base_unit,boost::units::static_rational&lt;1&gt;&gt;,boost::units::dimensionless_type&gt;,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DestinationSystem=boost::units::homogeneous_system&lt;boost::units::dimension_list&lt;boost::units::meter_base_unit,boost::units::dimension_list&lt;boost::units::scaled_base_unit&lt;boost::units::gram_base_unit,boost::units::scale&lt;10,boost::units::static_rational&lt;3&gt;&gt;&gt;,boost::units::dimension_list&lt;boost::units::second_base_unit,boost::units::dimension_list&lt;boost::units::ampere_base_unit,boost::units::dimension_list&lt;boost::units::kelvin_base_unit,boost::units::dimension_list&lt;boost::units::mole_base_unit,boost::units::dimension_list&lt;boost::units::candela_base_unit,boost::units::dimension_list&lt;boost::units::radian_base_unit,boost::units::dimension_list&lt;boost::units::steradian_base_unit,boost::units::dimensionless_type&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ]<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; boost/units/detail/conversion_impl.hpp(372) : while compiling class template member function &#39;boost::units::quantity&lt;Unit,Y&gt; boost::units::conversion_helper&lt;From,To&gt;::convert(const boost::units::quantity&lt;boost::units::unit&lt;Dim,System&gt;,Y&gt; &amp;)&#39;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; with<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Unit=my_unit,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Y=ofs::Real64,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; From=boost::units::quantity&lt;boost::units::unit&lt;boost::units::length_dimension,boost::units::FPS::system&gt;,double&gt;,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; To=boost::units::quantity&lt;my_unit,ofs::Real64&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Dim=boost::units::length_dimension,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; System=boost::units::FPS::system<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ]<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; boost/units/quantity.hpp(167) : see reference to class template instantiation &#39;boost::units::conversion_helper&lt;From,To&gt;&#39; being compiled<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; with<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; From=boost::units::quantity&lt;boost::units::unit&lt;boost::units::length_dimension,boost::units::FPS::system&gt;,double&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; To=boost::units::quantity&lt;my_unit,ofs::Real64&gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ]<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; testQuantifiedVector.cpp(47) : see reference to function template instantiation &#39;boost::units::quantity&lt;Unit,Y&gt;::quantity&lt;boost::units::unit&lt;Dim,System&gt;,double&gt;(const boost::units::quantity&lt;boost::units::unit&lt;Dim,System&gt;,Y&gt; &amp;,void *)&#39; being compiled<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; with<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Unit=my_unit,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Y=ofs::Real64,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Dim=boost::units::length_dimension,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; System=boost::units::FPS::system<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ]<br><br>Any guidance in this would be greatly appreciated.<br>
Pat<br><br>