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core: add CRTP base class to unit types

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The goal here is to add general addition and scalar multiplication
functions to the unit types.

Thereto, we need a CRTP
(https://en.wikipedia.org/wiki/Curiously_recurring_template_pattern)
base class.

However, this breaks compound initialization, so we have to use
named initializers:
	weight_t { 2000 } -> weight_t { .grams = 2000 }
The good thing is that this is exactly how these classes were
supposed to be used: make the unit explicit!

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2024-09-01 21:48:31 +02:00 • committed by bstoeger
parent 696ba61eef
commit 12ca172a9e
26 changed files with 127 additions and 138 deletions
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2
core/pref.cpp
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@ -41,7 +41,7 @@ preferences::preferences() :
ascratestops(9000 / 60),
ascrate50(9000 / 60),
ascrate75(9000 / 60),
bestmixend({ 30000 }),
bestmixend({ .mm = 30'000 }),
bottompo2(1400),
bottomsac(20000),
decopo2(1600),