| 1 | // Symbols and macros to supply platform-independent interfaces to mathematical |
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| 2 | // functions and constants. |
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| 3 | |
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| 4 | #ifndef Py_PYMATH_H |
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| 5 | #define Py_PYMATH_H |
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| 6 | |
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| 7 | /* High precision definition of pi and e (Euler) |
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| 8 | * The values are taken from libc6's math.h. |
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| 9 | */ |
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| 10 | #ifndef Py_MATH_PIl |
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| 11 | #define Py_MATH_PIl 3.1415926535897932384626433832795029L |
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| 12 | #endif |
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| 13 | #ifndef Py_MATH_PI |
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| 14 | #define Py_MATH_PI 3.14159265358979323846 |
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| 15 | #endif |
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| 16 | |
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| 17 | #ifndef Py_MATH_El |
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| 18 | #define Py_MATH_El 2.7182818284590452353602874713526625L |
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| 19 | #endif |
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| 20 | |
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| 21 | #ifndef Py_MATH_E |
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| 22 | #define Py_MATH_E 2.7182818284590452354 |
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| 23 | #endif |
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| 24 | |
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| 25 | /* Tau (2pi) to 40 digits, taken from tauday.com/tau-digits. */ |
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| 26 | #ifndef Py_MATH_TAU |
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| 27 | #define Py_MATH_TAU 6.2831853071795864769252867665590057683943L |
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| 28 | #endif |
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| 29 | |
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| 30 | // Py_IS_NAN(X) |
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| 31 | // Return 1 if float or double arg is a NaN, else 0. |
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| 32 | #define Py_IS_NAN(X) isnan(X) |
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| 33 | |
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| 34 | // Py_IS_INFINITY(X) |
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| 35 | // Return 1 if float or double arg is an infinity, else 0. |
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| 36 | #define Py_IS_INFINITY(X) isinf(X) |
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| 37 | |
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| 38 | // Py_IS_FINITE(X) |
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| 39 | // Return 1 if float or double arg is neither infinite nor NAN, else 0. |
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| 40 | #define Py_IS_FINITE(X) isfinite(X) |
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| 41 | |
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| 42 | // Py_INFINITY: Value that evaluates to a positive double infinity. |
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| 43 | #ifndef Py_INFINITY |
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| 44 | # define Py_INFINITY ((double)INFINITY) |
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| 45 | #endif |
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| 46 | |
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| 47 | /* Py_HUGE_VAL should always be the same as Py_INFINITY. But historically |
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| 48 | * this was not reliable and Python did not require IEEE floats and C99 |
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| 49 | * conformity. Prefer Py_INFINITY for new code. |
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| 50 | */ |
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| 51 | #ifndef Py_HUGE_VAL |
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| 52 | # define Py_HUGE_VAL HUGE_VAL |
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| 53 | #endif |
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| 54 | |
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| 55 | /* Py_NAN: Value that evaluates to a quiet Not-a-Number (NaN). The sign is |
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| 56 | * undefined and normally not relevant, but e.g. fixed for float("nan"). |
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| 57 | */ |
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| 58 | #if !defined(Py_NAN) |
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| 59 | # define Py_NAN ((double)NAN) |
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| 60 | #endif |
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| 61 | |
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| 62 | #endif /* Py_PYMATH_H */ |
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| 63 | |
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