core: add CRTP base class to unit types

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

View file

@ -309,7 +309,7 @@ static int divinglog_dive(void *param, int, char **data, char **)
state->cur_dive->watertemp.mkelvin = C_to_mkelvin(atol(data[9]));
if (data[10]) {
weightsystem_t ws = { { atoi(data[10]) * 1000 }, translate("gettextFromC", "unknown"), false };
weightsystem_t ws = { { .grams = atoi(data[10]) * 1000 }, translate("gettextFromC", "unknown"), false };
state->cur_dive->weightsystems.push_back(std::move(ws));
}