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 /* HUGE_VAL is supposed to expand to a positive double infinity. Python 43 * uses Py_HUGE_VAL instead because some platforms are broken in this 44 * respect. We used to embed code in pyport.h to try to worm around that, 45 * but different platforms are broken in conflicting ways. If you're on 46 * a platform where HUGE_VAL is defined incorrectly, fiddle your Python 47 * config to #define Py_HUGE_VAL to something that works on your platform. 48 */ 49 #ifndef Py_HUGE_VAL 50 # define Py_HUGE_VAL HUGE_VAL 51 #endif 52 53 // Py_NAN: Value that evaluates to a quiet Not-a-Number (NaN). 54 #if !defined(Py_NAN) 55 # if _Py__has_builtin(__builtin_nan) 56 // Built-in implementation of the ISO C99 function nan(): quiet NaN. 57 # define Py_NAN (__builtin_nan("")) 58 #else 59 // Use C99 NAN constant: quiet Not-A-Number. 60 // NAN is a float, Py_NAN is a double: cast to double. 61 # define Py_NAN ((double)NAN) 62 # endif 63 #endif 64 65 #endif /* Py_PYMATH_H */ 66