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> (Edit, that's not possible in c++)

Mind expanding on that? Because what that readme there shows is absolutely possible in C++, I have used a similar system for dealing with natural units.

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I'm happy to admit I'm wrong on that. My understanding is the bit that makes (kg.m)/s^2 type equivalent to a N, equivalent to J/m is not implementable in the same generic way.

All unit systems decompose each unit to primitives, that can then be aliased for notational convenience. So, a result of J/m decomposes the same as a N.

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