.\" -*-nroff-*-
.TH linreg 3 "9 March 2024" "Straylight/Edgeware" "mLib utilities library"
.\" @NANPN
.\" @INFP
.\" @NEGP
.
.SH SYNOPSIS
.nf
.B "#include <mLib/maths.h>"

.BI "int NANP(" floatish " " x );
.BI "int INFP(" floatish " " x );
.BI "int NEGP(" floatish " " x );
.fi
.
.SH DESCRIPTION
The
.B <mLib/maths.h>
header declares some minor low-level floating-point utilities.
These are mostly redundant with C99,
but provided for portability to older platforms.
.PP
The
.B NANP
macro returns nonzero if its argument is not-a-number.
The
.B INFP
macro returns nonzero if its argument is infinite.
The
.B NEGP
macro returns nonzero if its argument is negative;
on IEEE\ 754 platforms with sufficient support,
it will correctly detect negative zero.
.
.SH AUTHOR
Mark Wooding, <mdw@distorted.org.uk>