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core: make unit user-defined literals constexpr

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Currently, we can't use our unit literals, such as "3_m" in
constexpr context, for example to define them as variables
as such:

static constexpr deco_stops_multiplier = 3_m;

Declaring the respective operator""() functions as constexpr
enables this use case.

The _ft and _atm literals are left as non-constexpr, because
they use round(), which is not constexpr on our Android
compiler. Revise this later.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2024-12-13 19:20:59 +01:00
parent c88f8bdd07
commit 9f250458f6
1 changed files with 14 additions and 12 deletions
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26
core/units.h
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@ -144,11 +144,11 @@ struct duration_t : public unit_base<duration_t>
{ {
int32_t seconds = 0; // durations up to 34 yrs int32_t seconds = 0; // durations up to 34 yrs
}; };
static inline duration_t operator""_sec(unsigned long long sec) static constexpr inline duration_t operator""_sec(unsigned long long sec)
{ {
return duration_t { .seconds = static_cast<int32_t>(sec) }; return duration_t { .seconds = static_cast<int32_t>(sec) };
} }
static inline duration_t operator""_min(unsigned long long min) static constexpr inline duration_t operator""_min(unsigned long long min)
{ {
return duration_t { .seconds = static_cast<int32_t>(min * 60) }; return duration_t { .seconds = static_cast<int32_t>(min * 60) };
} }
@ -162,14 +162,15 @@ struct depth_t : public unit_base<depth_t> // depth to 2000 km
{ {
int32_t mm = 0; int32_t mm = 0;
}; };
static inline depth_t operator""_mm(unsigned long long mm) static constexpr inline depth_t operator""_mm(unsigned long long mm)
{ {
return depth_t { .mm = static_cast<int32_t>(mm) }; return depth_t { .mm = static_cast<int32_t>(mm) };
} }
static inline depth_t operator""_m(unsigned long long m) static constexpr inline depth_t operator""_m(unsigned long long m)
{ {
return depth_t { .mm = static_cast<int32_t>(m * 1000) }; return depth_t { .mm = static_cast<int32_t>(m * 1000) };
} }
// Not yet constexpr, because round() not constexpr on our Android compiler
static inline depth_t operator""_ft(unsigned long long ft) static inline depth_t operator""_ft(unsigned long long ft)
{ {
return depth_t { .mm = static_cast<int32_t>(round(ft * 304.8)) }; return depth_t { .mm = static_cast<int32_t>(round(ft * 304.8)) };
@ -179,14 +180,15 @@ struct pressure_t : public unit_base<pressure_t>
{ {
int32_t mbar = 0; // pressure up to 2000 bar int32_t mbar = 0; // pressure up to 2000 bar
}; };
static inline pressure_t operator""_mbar(unsigned long long mbar) static constexpr inline pressure_t operator""_mbar(unsigned long long mbar)
{ {
return pressure_t { .mbar = static_cast<int32_t>(mbar) }; return pressure_t { .mbar = static_cast<int32_t>(mbar) };
} }
static inline pressure_t operator""_bar(unsigned long long bar) static constexpr inline pressure_t operator""_bar(unsigned long long bar)
{ {
return pressure_t { .mbar = static_cast<int32_t>(bar * 1000) }; return pressure_t { .mbar = static_cast<int32_t>(bar * 1000) };
} }
// Not yet constexpr, because round() not constexpr on our Android compiler
static inline pressure_t operator""_atm(unsigned long long atm) static inline pressure_t operator""_atm(unsigned long long atm)
{ {
return pressure_t { .mbar = static_cast<int32_t>(round(atm * 1013.25)) }; return pressure_t { .mbar = static_cast<int32_t>(round(atm * 1013.25)) };
@ -196,7 +198,7 @@ struct o2pressure_t : public unit_base<o2pressure_t>
{ {
uint16_t mbar = 0; uint16_t mbar = 0;
}; };
static inline o2pressure_t operator""_baro2(unsigned long long bar) static constexpr inline o2pressure_t operator""_baro2(unsigned long long bar)
{ {
return o2pressure_t { .mbar = static_cast<uint16_t>(bar * 1000) }; return o2pressure_t { .mbar = static_cast<uint16_t>(bar * 1000) };
} }
@ -210,7 +212,7 @@ struct temperature_t : public unit_base<temperature_t>
{ {
uint32_t mkelvin = 0; // up to 4 MK (temperatures in K are always positive) uint32_t mkelvin = 0; // up to 4 MK (temperatures in K are always positive)
}; };
static inline temperature_t operator""_K(unsigned long long K) static constexpr inline temperature_t operator""_K(unsigned long long K)
{ {
return temperature_t { .mkelvin = static_cast<uint32_t>(K * 1000) }; return temperature_t { .mkelvin = static_cast<uint32_t>(K * 1000) };
} }
@ -224,11 +226,11 @@ struct volume_t : public unit_base<volume_t>
{ {
int mliter = 0; int mliter = 0;
}; };
static inline volume_t operator""_ml(unsigned long long ml) static constexpr inline volume_t operator""_ml(unsigned long long ml)
{ {
return volume_t { .mliter = static_cast<int>(ml) }; return volume_t { .mliter = static_cast<int>(ml) };
} }
static inline volume_t operator""_l(unsigned long long l) static constexpr inline volume_t operator""_l(unsigned long long l)
{ {
return volume_t { .mliter = static_cast<int>(l * 1000) }; return volume_t { .mliter = static_cast<int>(l * 1000) };
} }
@ -237,11 +239,11 @@ struct fraction_t : public unit_base<fraction_t>
{ {
int permille = 0; int permille = 0;
}; };
static inline fraction_t operator""_permille(unsigned long long permille) static constexpr inline fraction_t operator""_permille(unsigned long long permille)
{ {
return fraction_t { .permille = static_cast<int>(permille) }; return fraction_t { .permille = static_cast<int>(permille) };
} }
static inline fraction_t operator""_percent(unsigned long long percent) static constexpr inline fraction_t operator""_percent(unsigned long long percent)
{ {
return fraction_t { .permille = static_cast<int>(percent * 10) }; return fraction_t { .permille = static_cast<int>(percent * 10) };
} }