> Of course I am going slightly off-topic with this thoughts... So let's have a change of Subject.
> The QML based DSL driving it would benefit greatly if one could easily > express the physical unit of each number (ampere, newton, meters, ...) > and if one could preserve this information during calculations. I've played with this problem [0] extensively. It turns out to be quite tricky to do at all well, in general. There are some amusing petty problems (like dealing with the milli kg - a base unit has a quantifier in its name, which makes quantifiers trickier to get right). There are units that conflate - a torque should be measured in Nm and not expressed in J even though J = Nm is normally valid (in one case, the force and displacement are perpendicular, in the other parallel). It's fairly easy to do a clumsy job - [0] just reduces everything to base units and leaves the user to divide by a composite unit they'd sooner have seen used - but hard to do a systematically good job. My design notes for how to do better are the worst case of second system effect I've ever embarked on. Here be dragons. [0] https://github.com/ediosyncratic/study.py/tree/master/value Eddy. _______________________________________________ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development
