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 */