Torsten,
I'm pleased to see so much activity in the development of Boost.Units recently. I try to apply it myself in some code to model physical systems. There it helps me a lot to ensure the correct use of the model parameters inside the model equations and to ensure the correct composition of components to a system model. Certain component behaviour, I would like to parametrize for each component instance by passing a functor describing, e.g., a signal waveform or a non-linear relation between to quantities. I therefore tried to combine Boost.Units with Boost.Lambda and Boost.Function.
This looks like a very nice starting point for integration of Boost.Units with Lambda/Function. We naturally are enthusiastic about anything that leverages existing Boost technology and will extend the applicability of the Units library. If you are interested in putting together some extended examples and a test suite for this stuff and working to ensure that it functions well on the covered range of compilers, I think a <boost/units/lambda.hpp> header would be a nice extension to the library. Matthias