1 // Symbols and macros to supply platform-independent interfaces to mathematical 2 // functions and constants. 3 4 #ifndef Py_PYMATH_H 5 #define Py_PYMATH_H 6 7 /* High precision definition of pi and e (Euler) 8 * The values are taken from libc6's math.h. 9 */ 10 #ifndef Py_MATH_PIl 11 #define Py_MATH_PIl 3.1415926535897932384626433832795029L 12 #endif 13 #ifndef Py_MATH_PI 14 #define Py_MATH_PI 3.14159265358979323846 15 #endif 16 17 #ifndef Py_MATH_El 18 #define Py_MATH_El 2.7182818284590452353602874713526625L 19 #endif 20 21 #ifndef Py_MATH_E 22 #define Py_MATH_E 2.7182818284590452354 23 #endif 24 25 /* Tau (2pi) to 40 digits, taken from tauday.com/tau-digits. */ 26 #ifndef Py_MATH_TAU 27 #define Py_MATH_TAU 6.2831853071795864769252867665590057683943L 28 #endif 29 30 // Py_IS_NAN(X) 31 // Return 1 if float or double arg is a NaN, else 0. 32 #define Py_IS_NAN(X) isnan(X) 33 34 // Py_IS_INFINITY(X) 35 // Return 1 if float or double arg is an infinity, else 0. 36 #define Py_IS_INFINITY(X) isinf(X) 37 38 // Py_IS_FINITE(X) 39 // Return 1 if float or double arg is neither infinite nor NAN, else 0. 40 #define Py_IS_FINITE(X) isfinite(X) 41 42 // Py_INFINITY: Value that evaluates to a positive double infinity. 43 #ifndef Py_INFINITY 44 # define Py_INFINITY ((double)INFINITY) 45 #endif 46 47 /* Py_HUGE_VAL should always be the same as Py_INFINITY. But historically 48 * this was not reliable and Python did not require IEEE floats and C99 49 * conformity. Prefer Py_INFINITY for new code. 50 */ 51 #ifndef Py_HUGE_VAL 52 # define Py_HUGE_VAL HUGE_VAL 53 #endif 54 55 /* Py_NAN: Value that evaluates to a quiet Not-a-Number (NaN). The sign is 56 * undefined and normally not relevant, but e.g. fixed for float("nan"). 57 */ 58 #if !defined(Py_NAN) 59 # define Py_NAN ((double)NAN) 60 #endif 61 62 #endif /* Py_PYMATH_H */ 63