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ae81b42fe2
Thise makes initialization of unit types more palatable.
For example:
surface.time = sample.time - duration_t { .seconds = 20 };
=> surface.time = sample.time - 20_sec;
delta_depth.mm = feet_to_mm(1.0); // 1ft
=> delta_depth = 1_ft;
get_cylinderid_at_time(..., { .seconds = 20 * 60 + 1 }));
=> get_cylinderid_at_time(..., 20_min + 1_sec));
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
// SPDX-License-Identifier: GPL-2.0
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#ifndef GAS_H
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#define GAS_H
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#include "divemode.h"
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#include "units.h"
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#include <string>
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enum gas_component { N2, HE, O2 };
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// o2 == 0 && he == 0 -> air
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// o2 < 0 -> invalid
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struct gasmix {
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fraction_t o2;
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fraction_t he;
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std::string name() const;
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};
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static const struct gasmix gasmix_invalid = { { .permille = -1 }, { .permille = -1 } };
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static const struct gasmix gasmix_air = { 0_percent, 0_percent };
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enum gastype {
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GASTYPE_AIR,
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GASTYPE_NITROX,
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GASTYPE_HYPOXIC_TRIMIX,
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GASTYPE_NORMOXIC_TRIMIX,
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GASTYPE_HYPEROXIC_TRIMIX,
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GASTYPE_OXYGEN,
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GASTYPE_COUNT
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};
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struct icd_data { // This structure provides communication between function isobaric_counterdiffusion() and the calling software.
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int dN2; // The change in fraction (permille) of nitrogen during the change
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int dHe; // The change in fraction (permille) of helium during the change
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};
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extern bool isobaric_counterdiffusion(struct gasmix oldgasmix, struct gasmix newgasmix, struct icd_data *results);
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extern double gas_compressibility_factor(struct gasmix gas, double bar);
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extern double isothermal_pressure(struct gasmix gas, double p1, int volume1, int volume2);
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extern int same_gasmix(struct gasmix a, struct gasmix b);
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static inline int get_o2(const struct gasmix mix)
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{
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return mix.o2.permille ?: O2_IN_AIR;
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}
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static inline int get_he(const struct gasmix mix)
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{
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return mix.he.permille;
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}
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static inline int get_n2(struct gasmix mix)
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{
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return 1000 - get_o2(mix) - get_he(mix);
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}
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int pscr_o2(const double amb_pressure, struct gasmix mix);
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struct gas_pressures {
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double o2 = 0.0, n2 = 0.0, he = 0.0;
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};
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extern void sanitize_gasmix(struct gasmix &mix);
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extern int gasmix_distance(struct gasmix a, struct gasmix b);
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extern fraction_t get_gas_component_fraction(struct gasmix mix, enum gas_component component);
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extern gas_pressures fill_pressures(double amb_pressure, struct gasmix mix, double po2, enum divemode_t dctype);
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extern bool gasmix_is_air(struct gasmix gasmix);
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extern bool gasmix_is_invalid(struct gasmix mix);
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extern enum gastype gasmix_to_type(struct gasmix mix);
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extern const char *gastype_name(enum gastype type);
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extern fraction_t make_fraction(int f);
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#endif
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