core: add cast_int<> function

We had a pattern where doubles were converted to long with
lrint() and then down-cast to a narrower int type.

Because this is unwieldy, introduce a function encapsulating
this.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2024-09-03 09:52:12 +02:00 committed by bstoeger
parent 110e64bc66
commit 77b12bbccf
10 changed files with 34 additions and 23 deletions

View file

@ -275,8 +275,8 @@ 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 { .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 air { .mliter = int_cast<int>(((double)vol.mliter * get_n2(mix)) / (1000 - o2_in_topup)) };
volume_t he { .mliter = int_cast<int>(((double)vol.mliter * get_he(mix)) / 1000.0) };
volume_t o2 { .mliter = vol.mliter - he.mliter - air.mliter };
return std::make_pair(o2, he);
}