isunordered man page on Archlinux

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ISUNORDERED(3P)		   POSIX Programmer's Manual	       ISUNORDERED(3P)

       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

       isunordered — test if arguments are unordered

       #include <math.h>

       int isunordered(real-floating x, real-floating y);

       The functionality described on this reference page is aligned with  the
       ISO C  standard.	 Any  conflict between the requirements described here
       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
       defers to the ISO C standard.

       The  isunordered()  macro  shall	 determine  whether  its arguments are

       Upon successful completion, the isunordered() macro shall return	 1  if
       its arguments are unordered, and 0 otherwise.

       If x or y is NaN, 1 shall be returned.

       No errors are defined.

       The following sections are informative.


       The  relational	and  equality operators support the usual mathematical
       relationships between numeric values. For any ordered pair  of  numeric
       values,	exactly one of the relationships (less, greater, and equal) is
       true. Relational operators may raise the invalid floating-point	excep‐
       tion  when  argument values are NaNs. For a NaN and a numeric value, or
       for two NaNs, just the unordered relationship is true. This macro is  a
       quiet  (non-floating-point  exception  raising) version of a relational
       operator. It facilitates writing efficient code that accounts for  NaNs
       without suffering the invalid floating-point exception. In the SYNOPSIS
       section, real-floating indicates that the argument shall be an  expres‐
       sion of real-floating type.



       isgreater(), isgreaterequal(), isless(), islessequal(), islessgreater()

       The Base Definitions volume of POSIX.1‐2008, <math.h>

       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal  and	 Electronics  Engineers,  Inc  and  The	 Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum	 1  applied.)  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the	referee document. The original Standard can be obtained online
       at .

       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,	 see  https://www.ker‐ .

IEEE/The Open Group		     2013		       ISUNORDERED(3P)

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