diff options
Diffstat (limited to 'Include/pyport.h')
| -rw-r--r-- | Include/pyport.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/Include/pyport.h b/Include/pyport.h index 3d9b305..5bd641c 100644 --- a/Include/pyport.h +++ b/Include/pyport.h @@ -103,7 +103,7 @@ extern "C" { #define Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J) ((I) >> (J)) #endif -/* Py_FORCE_EXPANSION +/* Py_FORCE_EXPANSION(X) * "Simply" returns its argument. However, macro expansions within the * argument are evaluated. This unfortunate trickery is needed to get * token-pasting to work as desired in some cases. @@ -123,6 +123,14 @@ extern "C" { #define Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW) (NARROW)(VALUE) #endif +/* Py_IS_INFINITY(X) + * Return 1 if float or double arg is an infinity, else 0. + * Caution: + * X is evaluated more than once. + * This implementation may set the underflow flag if |X| is very small; + * it really can't be implemented correctly (& easily) before C99. + */ + #define Py_IS_INFINITY(X) ((X) && (X)*0.5 == (X)) /************************************************************************** Prototypes that are missing from the standard include files on some systems |