Mateusz Pusz

@mkrupcale, thanks for sharing your point of view in such detail with references to external docs. This is not an easy subject and controversies and inconsistencies in different unit libraries...

You are right. Are you going to provide a PR or should I do this? BTW, we might need those macros as I already had issues with `quantity_test.cpp` after the...

I do not think it is a good idea to choose the system of the first argument. From maths, we know that `a * b` should give the same result...

I am sorry to disagree here. It is up to the user that defines a system to determine if he/she wants inter-system conversions or not. In many cases, it is...

> Both fps and si use the same `length` base_quantity , so in the above the dimension is length ^ 2 in both fps and si systems isnt it ?...

> I think this is generally agreed to be called a base unit , A combination of a base_quantity with a measurement of a physical phenomena which is defined in...

> there should be different measurement sytems, but currently everything seems to depend on the si system. Well, it is because we chose to implement it that way based on...

Yes, the rationale is that the user expects to multiply a unit by max `1000`, otherwise a unit with a "higher" prefix will be used by the user.

Hi, this is a long story. You can read more in #32 and #99. Please see also this https://github.com/mpusz/units/issues/239#issuecomment-784559683. Please let me know if you have some ideas for improving...

I am not sure if I fully understand what you mean. Do you recommend creating inline namespaces in the SI for dimensions and putting all definitions there? For example: ```cpp...