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machine/rescap.h: Use constexpr where it won't change semantics.

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The other function-like macros will invoke type decay or promotion
depending on what the argument expressions evaluate to, so chaning
them to constepr functions could change semantics.
This commit is contained in:
Vas Crabb 2020-10-17 00:38:44 +11:00
parent 20a7993c8b
commit 35b3515fe0
1 changed files with 15 additions and 15 deletions
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30
src/devices/machine/rescap.h
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@ -4,19 +4,19 @@
#define MAME_MACHINE_RESCAP_H #define MAME_MACHINE_RESCAP_H
// Little helpers for magnitude conversions // Little helpers for magnitude conversions
#define RES_R(res) ((double)(res)) constexpr double RES_R(double res) { return res; }
#define RES_K(res) ((double)(res) * 1e3) constexpr double RES_K(double res) { return res * 1e3; }
#define RES_M(res) ((double)(res) * 1e6) constexpr double RES_M(double res) { return res * 1e6; }
#define RES_INF (-1) #define RES_INF (-1)
#define CAP_U(cap) ((double)(cap) * 1e-6) constexpr double CAP_U(double cap) { return cap * 1e-6; }
#define CAP_N(cap) ((double)(cap) * 1e-9) constexpr double CAP_N(double cap) { return cap * 1e-9; }
#define CAP_P(cap) ((double)(cap) * 1e-12) constexpr double CAP_P(double cap) { return cap * 1e-12; }
#define IND_U(ind) ((double)(ind) * 1e-6) constexpr double IND_U(double ind) { return ind * 1e-6; }
#define IND_N(ind) ((double)(ind) * 1e-9) constexpr double IND_N(double ind) { return ind * 1e-9; }
#define IND_P(ind) ((double)(ind) * 1e-12) constexpr double IND_P(double ind) { return ind * 1e-12; }
// vin --/\r1/\-- out --/\r2/\-- gnd // vin --/\r1/\-- out --/\r2/\-- gnd
#define RES_VOLTAGE_DIVIDER(r1, r2) ((double)(r2) / ((double)(r1) + (double)(r2))) constexpr double RES_VOLTAGE_DIVIDER(double r1, double r2) { return r2 / (r1 + r2); }
#define RES_2_PARALLEL(r1, r2) (((r1) * (r2)) / ((r1) + (r2))) #define RES_2_PARALLEL(r1, r2) (((r1) * (r2)) / ((r1) + (r2)))
#define RES_3_PARALLEL(r1, r2, r3) (1.0 / (1.0 / (r1) + 1.0 / (r2) + 1.0 / (r3))) #define RES_3_PARALLEL(r1, r2, r3) (1.0 / (1.0 / (r1) + 1.0 / (r2) + 1.0 / (r3)))
@ -28,13 +28,13 @@
// macro for the RC time constant on a 74LS123 with C > 1000pF // macro for the RC time constant on a 74LS123 with C > 1000pF
// R is in ohms, C is in farads // R is in ohms, C is in farads
#define TIME_OF_74LS123(r,c) (0.45 * (double)(r) * (double)(c)) constexpr double TIME_OF_74LS123(double r, double c) { return 0.45 * r * c; }
// macros for the RC time constant on a 555 timer IC // macros for the RC time constant on a 555 timer IC
// R is in ohms, C is in farads // R is in ohms, C is in farads
#define PERIOD_OF_555_MONOSTABLE_NSEC(r,c) ((attoseconds_t)(1100000000 * (double)(r) * (double)(c))) constexpr attoseconds_t PERIOD_OF_555_MONOSTABLE_NSEC(double r, double c) { return attoseconds_t(1100000000 * r * c); }
#define PERIOD_OF_555_ASTABLE_NSEC(r1,r2,c) ((attoseconds_t)( 693000000 * ((double)(r1) + 2.0 * (double)(r2)) * (double)(c))) constexpr attoseconds_t PERIOD_OF_555_ASTABLE_NSEC(double r1, double r2, double c) { return attoseconds_t( 693000000 * (r1 + 2.0 * r2) * c); }
#define PERIOD_OF_555_MONOSTABLE(r,c) attotime::from_nsec(PERIOD_OF_555_MONOSTABLE_NSEC(r,c)) constexpr attotime PERIOD_OF_555_MONOSTABLE(double r, double c) { return attotime::from_nsec(PERIOD_OF_555_MONOSTABLE_NSEC(r, c)); }
#define PERIOD_OF_555_ASTABLE(r1,r2,c) attotime::from_nsec(PERIOD_OF_555_ASTABLE_NSEC(r1,r2,c)) constexpr attotime PERIOD_OF_555_ASTABLE(double r1, double r2, double c) { return attotime::from_nsec(PERIOD_OF_555_ASTABLE_NSEC(r1, r2, c)); }
#endif // MAME_MACHINE_RESCAP_H #endif // MAME_MACHINE_RESCAP_H