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Update math macros to avoid computing callable arguments more than once#140

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93 changes: 67 additions & 26 deletionsapi/Common.h
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Original file line numberDiff line numberDiff line change
Expand Up@@ -37,20 +37,63 @@ typedef enum {
#define SERIAL 0x0
#define DISPLAY 0x1

#ifndef constrain
#define constrain(amt,low,high) ((amt)<(low)?(low):((amt)>(high)?(high):(amt)))
#endif

#ifndef radians
#define radians(deg) ((deg)*DEG_TO_RAD)
#endif
#ifdef __cplusplus
} // extern "C"

#ifndef degrees
#define degrees(rad) ((rad)*RAD_TO_DEG)
template<class T, class U, class V>
auto constrain(const T& amt, const U& low, const V& high) -> decltype(amt < low ? low : (amt > high ? high : amt))
{
return amt < low ? low : (amt > high ? high : amt);
}

template<class T>
auto radians(const T& deg) -> decltype(deg * DEG_TO_RAD)
{
return deg * DEG_TO_RAD;
}

template<class T>
auto degrees(const T& rad) -> decltype(rad * RAD_TO_DEG)
{
return rad * RAD_TO_DEG;
}

template<class T>
auto sq(const T& x) -> decltype(x*x)
{
return x*x;
}
#else
#ifndef constrain
#define constrain(amt,low,high) \
({ __typeof__ (amt) _amt = (amt); \
__typeof__ (low) _low = (low); \
__typeof__ (high) _high = (high); \
_amt < _low ? _low : (_amt > _high ? _high :_amt); })
#endif

#ifndef radians
#define radians(deg) \
({ __typeof__ (deg) _deg = deg; \
_deg * DEG_TO_RAD; })
#endif

#ifndef degrees
#define degrees(rad) \
({ __typeof__ (rad) _rad = rad; \
_rad * RAD_TO_DEG; })
#endif

#ifndef sq
#define sq(x) \
({ __typeof__ (x) _x = x; \
_x * _x; })
#endif
#endif

#ifndef sq
#define sq(x) ((x)*(x))
#ifdef __cplusplus
extern "C" {
#endif

typedef void (*voidFuncPtr)(void);
Expand DownExpand Up@@ -117,33 +160,31 @@ void loop(void);

#ifdef __cplusplus
} // extern "C"
#endif

#ifdef __cplusplus
template<class T, class L>
template<class T, class L>
auto min(const T& a, const L& b) -> decltype((b < a) ? b : a)
{
return (b < a) ? b : a;
}

template<class T, class L>
template<class T, class L>
auto max(const T& a, const L& b) -> decltype((b < a) ? b : a)
{
return (a < b) ? b : a;
}
#else
#ifndef min
#define min(a,b) \
({ __typeof__ (a) _a = (a); \
__typeof__ (b) _b = (b); \
_a < _b ? _a : _b; })
#endif
#ifndef max
#define max(a,b) \
({ __typeof__ (a) _a = (a); \
__typeof__ (b) _b = (b); \
_a > _b ? _a : _b; })
#endif
#ifndef min
#define min(a,b) \
({ __typeof__ (a) _a = (a); \
__typeof__ (b) _b = (b); \
_a < _b ? _a : _b; })
#endif
#ifndef max
#define max(a,b) \
({ __typeof__ (a) _a = (a); \
__typeof__ (b) _b = (b); \
_a > _b ? _a : _b; })
#endif
#endif

#ifdef __cplusplus
Expand Down
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