- at least the following interfaces exist: fp_classify(), fp_class(),
- class(), isnan(), isinf(), isfinite(), finite(), isnormal(),
- fp_setmask(), fp_getmask(), fp_setround(), fp_getround(),
- ieeefp.h, fp_class.h. There are metaconfig units for all of these.
+ At least the following interfaces exist: fp_classify(), fp_class(),
+ class(), isinf(), isfinite(), finite(), isnormal(), unordered(),
+ <ieeefp.h>, <fp_class.h> (there are metaconfig units for all these),
+ fp_setmask(), fp_getmask(), fp_setround(), fp_getround()
+ (no metaconfig units yet for these).
+ Don't forget finitel(), fp_classl(), fp_class_l(), (yes, both do,
+ unfortunately, exist), and unorderedl().
+ PREFERABLY AS AN EXTENSION.
+ As of 5.6.1 there is cpp macro Perl_isnan().