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-'\" t
-.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.\" 2002-07-27 Walter Harms
-.\" this was done with the help of the glibc manual
-.\"
-.TH isgreater 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-isgreater, isgreaterequal, isless, islessequal, islessgreater,
-isunordered \- floating-point relational tests without exception for NaN
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.P
-.BI "int isgreater(" x ", " y );
-.BI "int isgreaterequal(" x ", " y );
-.BI "int isless(" x ", " y );
-.BI "int islessequal(" x ", " y );
-.BI "int islessgreater(" x ", " y );
-.BI "int isunordered(" x ", " y );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.nf
-    All functions described here:
-        _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
-.fi
-.SH DESCRIPTION
-The normal relational operations (like
-.BR < ,
-"less than")
-fail if one of the operands is NaN.
-This will cause an exception.
-To avoid this, C99 defines the macros listed below.
-.P
-These macros are guaranteed to evaluate their arguments only once.
-The arguments must be of real floating-point type (note: do not pass
-integer values as arguments to these macros, since the arguments will
-.I not
-be promoted to real-floating types).
-.TP
-.BR isgreater ()
-determines \fI(x)\ >\ (y)\fP without an exception
-if
-.I x
-or
-.I y
-is NaN.
-.TP
-.BR isgreaterequal ()
-determines \fI(x)\ >=\ (y)\fP without an exception
-if
-.I x
-or
-.I y
-is NaN.
-.TP
-.BR isless ()
-determines \fI(x)\ <\ (y)\fP without an exception
-if
-.I x
-or
-.I y
-is NaN.
-.TP
-.BR islessequal ()
-determines \fI(x)\ <=\ (y)\fP without an exception
-if
-.I x
-or
-.I y
-is NaN.
-.TP
-.BR islessgreater ()
-determines \fI(x)\ < (y) || (x) >\ (y)\fP
-without an exception if
-.I x
-or
-.I y
-is NaN.
-This macro is not equivalent to \fIx\ !=\ y\fP because that expression is
-true if
-.I x
-or
-.I y
-is NaN.
-.TP
-.BR isunordered ()
-determines whether its arguments are unordered, that is, whether
-at least one of the arguments is a NaN.
-.SH RETURN VALUE
-The macros other than
-.BR isunordered ()
-return the result of the relational comparison;
-these macros return 0 if either argument is a NaN.
-.P
-.BR isunordered ()
-returns 1 if
-.I x
-or
-.I y
-is NaN and 0 otherwise.
-.SH ERRORS
-No errors occur.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR isgreater (),
-.BR isgreaterequal (),
-.BR isless (),
-.BR islessequal (),
-.BR islessgreater (),
-.BR isunordered ()
-T}	Thread safety	MT-Safe
-.TE
-.SH VERSIONS
-Not all hardware supports these functions,
-and where hardware support isn't provided, they will be emulated by macros.
-This will result in a performance penalty.
-Don't use these functions if NaN is of no concern for you.
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, C99.
-.SH SEE ALSO
-.BR fpclassify (3),
-.BR isnan (3)