/home/mdboom/Work/builds/cpython/Include/pymath.h
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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 */ |