[geos-devel] #define DoubleNotANumber 1.7e-308

[David Blasby]

Why is NaN being defined (platform.h) as a valid number?

Shouldn't it be defined as one of the actual NaNs?

(a != a) iff a is NaN

 From  ieee754.h:

  struct
       {
#if __BYTE_ORDER == __BIG_ENDIAN
     unsigned int negative:1;
     unsigned int exponent:8;
     unsigned int quiet_nan:1;
     unsigned int mantissa:22;
#endif              /* Big endian.  */
#if __BYTE_ORDER == __LITTLE_ENDIAN
     unsigned int mantissa:22;
     unsigned int quiet_nan:1;
     unsigned int exponent:8;
     unsigned int negative:1;
#endif              /* Little endian.  */
       } ieee_nan;


dave