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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/libdivecomputer.cpp
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@ -160,7 +160,7 @@ static dc_status_t parse_gasmixes(device_data_t *devdata, struct dive *dive, dc_
}
}
bool no_volume = true;
struct gasmix bottom_gas = { {1000}, {0} }; /* Default to pure O2, or air if there are no mixes defined */
struct gasmix bottom_gas = { { .permille = 1000}, {} }; /* Default to pure O2, or air if there are no mixes defined */
if (ngases == 0) {
bottom_gas = gasmix_air;
}