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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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6
core/statistics.cpp
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@ -275,9 +275,9 @@ static std::pair<volume_t, volume_t> get_gas_parts(struct gasmix mix, volume_t v
if (gasmix_is_air(mix))
return { volume_t() , volume_t() };
volume_t air = { (int)lrint(((double)vol.mliter * get_n2(mix)) / (1000 - o2_in_topup)) };
volume_t he = { (int)lrint(((double)vol.mliter * get_he(mix)) / 1000.0) };
volume_t o2 = { vol.mliter - he.mliter - air.mliter };
volume_t air { .mliter = (int)lrint(((double)vol.mliter * get_n2(mix)) / (1000 - o2_in_topup)) };
volume_t he { .mliter = (int)lrint(((double)vol.mliter * get_he(mix)) / 1000.0) };
volume_t o2 { .mliter = vol.mliter - he.mliter - air.mliter };
return std::make_pair(o2, he);
}