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// Symbols and macros to supply platform-independent interfaces to mathematical
// functions and constants.

#ifndef Py_PYMATH_H
#define Py_PYMATH_H

/* High precision definition of pi and e (Euler)
 * The values are taken from libc6's math.h.
 */
#ifndef Py_MATH_PIl
#define Py_MATH_PIl 3.1415926535897932384626433832795029L
#endif
#ifndef Py_MATH_PI
#define Py_MATH_PI 3.14159265358979323846
#endif

#ifndef Py_MATH_El
#define Py_MATH_El 2.7182818284590452353602874713526625L
#endif

#ifndef Py_MATH_E
#define Py_MATH_E 2.7182818284590452354
#endif

/* Tau (2pi) to 40 digits, taken from tauday.com/tau-digits. */
#ifndef Py_MATH_TAU
#define Py_MATH_TAU 6.2831853071795864769252867665590057683943L
#endif

// Py_IS_NAN(X)
// Return 1 if float or double arg is a NaN, else 0.
#define Py_IS_NAN(X) isnan(X)

// Py_IS_INFINITY(X)
// Return 1 if float or double arg is an infinity, else 0.
#define Py_IS_INFINITY(X) isinf(X)

// Py_IS_FINITE(X)
// Return 1 if float or double arg is neither infinite nor NAN, else 0.
#define Py_IS_FINITE(X) isfinite(X)

/* HUGE_VAL is supposed to expand to a positive double infinity.  Python
 * uses Py_HUGE_VAL instead because some platforms are broken in this
 * respect.  We used to embed code in pyport.h to try to worm around that,
 * but different platforms are broken in conflicting ways.  If you're on
 * a platform where HUGE_VAL is defined incorrectly, fiddle your Python
 * config to #define Py_HUGE_VAL to something that works on your platform.
 */
#ifndef Py_HUGE_VAL
#  define Py_HUGE_VAL HUGE_VAL
#endif

// Py_NAN: Value that evaluates to a quiet Not-a-Number (NaN).
#if !defined(Py_NAN)
#  if _Py__has_builtin(__builtin_nan)
     // Built-in implementation of the ISO C99 function nan(): quiet NaN.
#    define Py_NAN (__builtin_nan(""))
#else
     // Use C99 NAN constant: quiet Not-A-Number.
     // NAN is a float, Py_NAN is a double: cast to double.
#    define Py_NAN ((double)NAN)
#  endif
#endif

#endif /* Py_PYMATH_H */