rcsid TRIO_ARGS1 TRIO_ARGS2 TRIO_FALSE trio_nan trio_ninf trio_nzero trio_pinf TRIO_TRUE

TRIO_PUBLIC double trio_nan ( TRIO_NOARGS  ) Generate NaN. Returns: Floating-point representation of NaN. Definition at line 323 of file trionan.c. Referenced by TRIO_ARGS2(), and TRIO_ARGS4(). { /* Cache the result */ static double result = 0.0; if (result == 0.0) { #if defined(TRIO_COMPILER_SUPPORTS_C99) result = nan(""); #elif defined(NAN) && defined(__STDC_IEC_559__) result = (double)NAN; #elif defined(USE_IEEE_754) result = trio_make_double(ieee_754_qnan_array); #else /* * There are several ways to generate NaN. The one used here is * to divide infinity by infinity. I would have preferred to add * negative infinity to positive infinity, but that yields wrong * result (infinity) on FreeBSD. * * This may fail if the hardware does not support NaN, or if * the Invalid Operation floating-point exception is unmasked. */ # if defined(TRIO_PLATFORM_UNIX) void (*signal_handler)(int) = signal(SIGFPE, SIG_IGN); # endif result = trio_pinf() / trio_pinf(); # if defined(TRIO_PLATFORM_UNIX) signal(SIGFPE, signal_handler); # endif #endif } return result; }