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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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4
core/profile.cpp
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@ -1504,8 +1504,8 @@ std::vector<std::string> compare_samples(const struct dive *d, const struct plot
const cylinder_t *cyl = d->get_cylinder(cylinder_index);
// TODO: Implement addition/subtraction on units.h types
volumes_used[cylinder_index] += cyl->gas_volume((pressure_t){ last_pressures[cylinder_index] }).mliter -
cyl->gas_volume((pressure_t){ next_pressure }).mliter;
volumes_used[cylinder_index] += cyl->gas_volume((pressure_t){ .mbar = last_pressures[cylinder_index] }).mliter -
cyl->gas_volume((pressure_t){ .mbar = next_pressure }).mliter;
}
// check if the gas in this cylinder is being used