86 lines
3.4 KiB
C
86 lines
3.4 KiB
C
/* $Id: qfits_float.h,v 1.3 2006/02/17 10:24:52 yjung Exp $
|
|
*
|
|
* This file is part of the ESO QFITS Library
|
|
* Copyright (C) 2001-2004 European Southern Observatory
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
/*
|
|
* $Author: yjung $
|
|
* $Date: 2006/02/17 10:24:52 $
|
|
* $Revision: 1.3 $
|
|
* $Name: qfits-6_1_0 $
|
|
*/
|
|
|
|
#ifndef QFITS_FLOAT_H
|
|
#define QFITS_FLOAT_H
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
Macros
|
|
-----------------------------------------------------------------------------*/
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/**
|
|
@brief Test a floating-point variable for NaN value.
|
|
@param n Number to test (float or double)
|
|
@return 1 if n is NaN, 0 else.
|
|
|
|
This macro is needed to support both float and double variables
|
|
as input parameter. It checks on the size of the input variable
|
|
to branch to the float or double version.
|
|
|
|
Portability is an issue for this function which is present on
|
|
most Unixes but not all, under various libraries (C lib on BSD,
|
|
Math lib on Linux, sunmath on Solaris, ...). Integrating the
|
|
code for this function makes qfits independent from any math
|
|
library.
|
|
*/
|
|
/*----------------------------------------------------------------------------*/
|
|
#define qfits_isnan(n) ((sizeof(n)==sizeof(float)) ? _qfits_isnanf(n) : \
|
|
(sizeof(n)==sizeof(double)) ? _qfits_isnand(n) : -1)
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/**
|
|
@brief Test a floating-point variable for Inf value.
|
|
@param n Number to test (float or double)
|
|
@return 1 if n is Inf or -Inf, 0 else.
|
|
|
|
This macro is needed to support both float and double variables
|
|
as input parameter. It checks on the size of the input variable
|
|
to branch to the float or double version.
|
|
|
|
Portability is an issue for this function which is missing on most
|
|
Unixes. Most of the time, another function called finite() is
|
|
offered to perform the opposite task, but it is not consistent
|
|
among platforms and found in various libraries. Integrating the
|
|
code for this function makes qfits independent from any math
|
|
library.
|
|
*/
|
|
/*----------------------------------------------------------------------------*/
|
|
#define qfits_isinf(n) ((sizeof(n)==sizeof(float)) ? _qfits_isinff(n) : \
|
|
(sizeof(n)==sizeof(double)) ? _qfits_isinfd(n) : -1)
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
Function prototypes
|
|
-----------------------------------------------------------------------------*/
|
|
|
|
int _qfits_isnanf(float) ;
|
|
int _qfits_isinff(float) ;
|
|
int _qfits_isnand(double) ;
|
|
int _qfits_isinfd(double) ;
|
|
|
|
#endif
|