include/python3.12/pymath.h

0001 // Symbols and macros to supply platform-independent interfaces to mathematical
0002 // functions and constants.
0003
0004 #ifndef Py_PYMATH_H
0005 #define Py_PYMATH_H
0006
0007 /* High precision definition of pi and e (Euler)
0008  * The values are taken from libc6's math.h.
0009  */
0010 #ifndef Py_MATH_PIl
0011 #define Py_MATH_PIl 3.1415926535897932384626433832795029L
0012 #endif
0013 #ifndef Py_MATH_PI
0014 #define Py_MATH_PI 3.14159265358979323846
0015 #endif
0016
0017 #ifndef Py_MATH_El
0018 #define Py_MATH_El 2.7182818284590452353602874713526625L
0019 #endif
0020
0021 #ifndef Py_MATH_E
0022 #define Py_MATH_E 2.7182818284590452354
0023 #endif
0024
0025 /* Tau (2pi) to 40 digits, taken from tauday.com/tau-digits. */
0026 #ifndef Py_MATH_TAU
0027 #define Py_MATH_TAU 6.2831853071795864769252867665590057683943L
0028 #endif
0029
0030 // Py_IS_NAN(X)
0031 // Return 1 if float or double arg is a NaN, else 0.
0032 #define Py_IS_NAN(X) isnan(X)
0033
0034 // Py_IS_INFINITY(X)
0035 // Return 1 if float or double arg is an infinity, else 0.
0036 #define Py_IS_INFINITY(X) isinf(X)
0037
0038 // Py_IS_FINITE(X)
0039 // Return 1 if float or double arg is neither infinite nor NAN, else 0.
0040 #define Py_IS_FINITE(X) isfinite(X)
0041
0042 // Py_INFINITY: Value that evaluates to a positive double infinity.
0043 #ifndef Py_INFINITY
0044 #  define Py_INFINITY ((double)INFINITY)
0045 #endif
0046
0047 /* Py_HUGE_VAL should always be the same as Py_INFINITY.  But historically
0048  * this was not reliable and Python did not require IEEE floats and C99
0049  * conformity.  Prefer Py_INFINITY for new code.
0050  */
0051 #ifndef Py_HUGE_VAL
0052 #  define Py_HUGE_VAL HUGE_VAL
0053 #endif
0054
0055 /* Py_NAN: Value that evaluates to a quiet Not-a-Number (NaN).  The sign is
0056  * undefined and normally not relevant, but e.g. fixed for float("nan").
0057  */
0058 #if !defined(Py_NAN)
0059 #    define Py_NAN ((double)NAN)
0060 #endif
0061
0062 #endif /* Py_PYMATH_H */